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Emerson Fisher 4194 Instruction Manual

1. 41 Process Tubing 41 Capsular Element Assembly 41 Maintenance Calibration 42 Precalibration Procedures 42 Aligning the Drive Bracket Assembly 42 Setting the Travel Stops 42 Aligning Linkage 43 Zero and Span Adjustment 43 Linearity Adjustment 44 Flapper Alignment 44 Remote Set Point Option M 45 Replacing eren 45 Pivot Assembly A 46 Pivot Assembly B 46 Drive Flexure 47 TUBING oen 47 Remote Set Point Capsular Element 47 Ws PET 48 ED PERTERRITI T DT 48 Maintenance Calibration 48 Precalibration Procedure 48 Setting Travel Stops 49 Section 1 Introduction Scope of Manual Instruction Manual D200158X012 Aligning Linkage 49 Zero and Span Adjustment 49 Linearity Adjustment 50 Auto Manual Option E 50 Replacing the Auto ManualStation 51 Disassembly 51 ASSGITIDIVS ies ene 51 Replacing the Switch Body Assembly Lever O Ring Switch Body O Ring and Tubing Assembly 51 Disa
2. EIN BT ES EB 20 84 ia 2 511 SECTION D D ME o Instruction Manual D200158X012 Figure 5 1 Controller Assembly Drawing Continued t AD 2 i 2 i DET A ae m pr HL tH a ii H ET 53 SECTION B B L 49A0770 A 36A3819 A CONTROLLERS WITH REMOTE SET POINT OPTION 4194S Controllers December 2011 Figure 5 2 Capsular Element Assembly VIEW DRIVE BRACKET ASSEMBLY amp g GEHE gu 15 lt vA NE Ai Qo 8 es 58A0706 C 59 4194S Controllers Instruction Manual December 2011 D200158X012 Figure 5 3 Remote Set Point Assembly Drawing PS em S amp 8 G fem 2 SN E a IF Tee a PEE 7 LO TTL PA f m S 8 9 amp amp APPLY LUB SEALANT 36A6988 C Instruction Manual 4194S Controllers D200158X012 December 2011 Figure 5 4 Auto Manual Station Parts Location METAL BALL PLASTIC TUBE LOADER KNOB AUTOMATIC MANUAL SWITCH SWITCHING ZONE INDICATION ll m 4
3. A WARNING The switch body springs key 295 are under preload To avoid personal injury or losing parts carefully separate the switch body assembly from the loader assembly 7 E two screws key 290 and separate the switch body assembly key 291 from the loader assembly ey 282 8 Remove the O rings keys 292 293 and 294 switch body springs key 295 and balls key 296 9 Loosen two screws key 308 and remove the closing plate key 307 and the closing plate gasket key 306 10 Pull the clip key 300 from its engagement with the lever assembly shaft key 297 11 Pull the lever assembly from the switch body assembly key 291 and rocker key 299 12 Remove the O ring key 298 13 Inspect the O rings and gaskets for damage or wear replace if necessary Assembly 1 Insert the lever assembly key 297 into the switch body assembly key 291 and hold the rocker key 299 with the flats on the lever assembly shaft 2 Insert the clip key 300 in the groove of the lever assembly shaft to hold the lever assembly key 297 in the switch body assembly key 291 3 Position the closing plate gasket key 306 and the closing plate key 307 Secure with two screws key 308 Note After assembly in step 3 be sure the side of the closing plate marked OUT is visible 4 Place the balls key 296 switch body springs key 295 and O rings keys 292 293 and 294 in the switch body assembly key 291 Note
4. Link Number 4 1 2 3 Remove the two screws key 6 and lift off the proportional band indicator cover key 36 Note where the link is connected Disconnect the link from the bellows bracket assembly key 31 and the input feedback assembly key 11 Connect the replacement link to the input feedback assembly so that the two adjusting screws on the link are nearest to the feedback bellows bracket The screw heads should face the bottom of the controller as shown in figure 4 15 and be positioned as noted in step 2 Figure 4 14 Link Number 3 Adjustment Figure 4 15 Position of Link Number 4 Adjusting Screws SCREW HEADS SET POINT PIVOT ASSEMBLY W3445 1 4 P Xo LINK 3 SCREW AND WASHER SCREW WASHER KEYS 19 AND 20 lt 2 KEYS 19 AND 20 lt NOTES SCREW INSERTED INTO THE SET POINT PIVOT ASSEMBLY 2 gt SCREW INSERTED INTO THE RELAY NOZZLE TUBING ASSEMBLY 39 4194S Controllers Instruction Manual December 2011 D200158X012 4 Adjust the process differential pressure to 0 psid Adjust the proportional band to 5 percent direct acting and move the set point manually or with the remote set point pressure to 100 percent of process scale range Controller output should be 0 psig 5 With zero pressure in the feedback bellows loosen the two adjustment screws on the link Connect the free end of the link to the bellows bracket assembly and allow the link to find its free length 6 T
5. CAUTION When removing and replacing positive feedback bellows keep in mind that the bellows has left hand threads Overtightening could damage the threads 7 Unscrew the bellows 8 Before installing the replacement bellows coat the threads with a suitable lubricant Screw in the replacement bellows until it is finger tight against the frame key 3 9 Install the four screws key 6 through the bellows bracket key 31 into the bellows beam key 49 10 Install the two screws key 35 through the bellows bracket key 31 into the bellows Install the bellows adjustment bracket key 32 spring key 33 and tighten the screw key 34 until the spring is compressed completely Tighten the two screws key 35 Ensure the bellows bracket key 31 is installed correctly so it does not rub against the frame 11 Replace the positive feedback tubing assembly on the bellows base 35 4194S Controllers Instruction Manual December 2011 D200158X012 12 13 14 15 16 17 18 19 Apply the correct supply pressure and check for leaks Remove the supply pressure If the length of link 4 key 65 was not changed proceed with step 14 If the length of link 4 key 65 was changed during this procedure refer to the replacement procedures for the flapper flexure pivot assembly Perform steps 36 through 38 of the procedure Replace link 4 on the bellows bracket Make sure the link does not touch the frame If it does
6. Output pressure is fed back to the positive feedback bellows The action of this bellows is a positive feedback action that moves the flapper closer to the nozzle increasing nozzle pressure which in turn increases the relay output Output pressure to the final control element switches to full supply pressure As the process differential pressure decreases approaching the lower switching point the flapper moves away from the nozzle in a direct acting controller reducing nozzle pressure Through relay action pressure to the positive feedback bellows is reduced moving the flapper further away from the nozzle and further reducing nozzle pressure Output pressure to the final control element switches to zero The set point adjustment changes the proximity of the nozzle and flapper as does a change in process pressure except that when the set point is changed the nozzle moves with respect to the flapper The set point adjustment moves both the upper and lower switching points The proportional band knob positions the nozzle on the flapper Increasing widening the proportional band moves the nozzle away from the input connection When the proportional band adjustment moves the nozzle across the feedback connection the controller action changes between direct and reverse On a direct acting controller changing the proportional band adjustment will widen or narrow the differential gap between the two switching points This is accomplished by chang
7. or noncorrosive gas While use and regular maintenance of a filter that removes particles larger than 40 micrometers in diameter will suffice in most applications check with an Emerson Process Management field office and industry instrument air quality standards for use with corrosive gas or if you are unsure about the proper amount or method of air filtration or filter maintenance Supply pressure must be clean dry air or noncorrosive gas that meets the requirements of ISA Standard 7 0 01 A maximum 40 micrometer particle size in the air system is acceptable Further filtration down to 5 micrometer particle size is recommended Lubricant content is not to exceed 1 ppm weight w w or volume v v basis Condensation in the air supply should be minimized Alternatively natural gas may be used as the supply pressure medium Gas must be clean dry oil free and noncorrosive H2S content should not exceed 20 ppm Use a suitable supply pressure regulator to reduce the supply pressure source to 1 4 bar 20 psig for an output signal range of 0 and 1 4 bar 0 and 20 psig and to 2 4 bar 35 psig for an output signal range of 0 and 2 4 bar 0 and 35 psig Remote Set Point Pressure Option M If the controller has the remote set point option connect the remote set point pressure to the top of the controller case at the location shown in figure 2 5 Use a clean dry air supply Vent Personal injury or property damage could result from fire or exp
8. pl steel 3 req d 68 Bracket pl steel Actuator Casing Mounting Spacer Spool steel 3 req d Cap Screw pl steel 3 req d Lockwasher pl steel 5 req d Mounting Bracket pl steel Cap Screw pl steel 2 req d Mounting Bracket pl steel Cap Screw pl steel 2 req d Hex Nut pl steel 2 req d 41945 Controllers December 2011 Description Actuator Yoke Mounting Spacer Spool steel 3 req d Cap Screw pl steel 3 req d Lockwasher pl steel 5 req d Mounting Bracket steel Spacer Spool steel 2 req d Cap Screw pl steel 2 req d Note Specify quantity of fittings and length of tubing required Tubing For 1 4 inch O D copper For 3 8 inch O D copper Fittings For 1 4 inch tubing Connector brass Elbow brass For 3 8 inch tubing Connector brass Elbow brass 57 4194S Controllers Instruction Manual December 2011 D200158X012 Figure 5 1 Controller Assembly Drawing E W WE s 2 TotW zi A AT A ma NE COEM a C A v SA eh Aa FEX SSSA DA 69 62 6 66 O 62 Bis WN i L os rs SIN D e 57 X ZA 26 EI 22 48 mee EN 510 ad fI E FEL Pago ll A Jo 24 895 g A s 6 4 A 8 eo 7 Les p O o Bi 317 18 DO
9. 3 3 Example The sensing element has a range of 30 psi The lower switching point is to be set at 10 psi and the upper switching point is to be set at 25 psi Proceed as follows e Divide the differential gap the difference between the upper and lower switching points by the sensing element range Multiply the result by 100 as shown in the following equation Differential Gap 15 psi x 100 100 50 Sensing Element Range 30 psi Locate the 50 percent line on figure 3 3 Move along this line until you intersect the curve Read the proportional band setting on the left hand axis For this example the setting is approximately 35 percent Figure 3 3 Curve for Determining Proportional Band Setting PROPORTIONAL BAND SETTING SENSOR RANGE BETWEEN SWITCHING POINTS A2853 1 1 Using the curve in figure 3 3 determine the correct proportional band setting for the desired gap expressed as a percent of the input span between the switching points 2 Set the proportional band knob to the desired setting determined in step 1 3 Adjust the set point to the desired upper switching point 4 Increase the process differential pressure until the controller output signal switches from zero pressure to full supply pressure 5 Decrease the process differential pressure to the desired switching point at which the controller output signal switches from full supply pressure to zero pressure Instruction Manual 4194S Con
10. ADJUSTMENT ADJUSTMENT W3753 1 LINK 3 CAPSULAR ELEMENT CONTROLLERS 37 4194S Controllers Instruction Manual December 2011 D200158X012 Figure 4 13 Process Pointer Alignment 1 amp LN i SSN Afi mM ui i iv 18 ALIGNED MISALIGNED FINE ZERO ADJUSTMENT W3443 1 W3475 1 Link Number 2 Note Link number 2 is made of aluminum for temperature compensation purposes Do not replace it with a link of other material 38 Remove the two screws key 6 and lift off the proportional band indicator cover key 36 Note where the link is connected Disconnect the link from process pointer assembly and from the input feedback beam assembly key 11 Remove the link Install the replacement link with the screw head nearest the process pointer as shown in figure 4 12 Connect the link to the process pointer assembly only and in the position in step 2 Adjust the set point manually or with the remote set point pressure to 100 percent of the process scale range Set the proportional band between DIRECT and REVERSE Disconnect link number 1 from the pivot arm manually position the process pointer to 100 percent on the scale Adjust the length of link number 2 by turning the adjusting screw clockwise to increase length counterclockwise to decrease length so that the pin on the end of the link is approximately one half of its diameter short of aligning
11. F ail y N 7 V UN KL OT 39A0770A SIDE VIEW COVER REMOVED BACK VIEW COVER REMOVED C0540 61 4194S Controllers Instruction Manual December 2011 0200158 012 Figure 5 5 Auto Manual Station Assembly Drawing 8888 595398 ae SECTION A A 275 4 AI 292 t SECTION B B 5 29 SECTION C C Instruction Manual 4194S Controllers D200158X012 December 2011 Figure 5 6 Process and Set Point Indicator Assembly Manual Set Point TT 6 39 1126 INDICATOR ASSEMBLY 36A6986 C 379 PROCESS SET POINT INDICATOR ASSEMBLY 381 380 382 32B1532 A PROCESS SET POINT INDICATOR ASSEMBLY WITH BOURDON TUBE 63 4194S Controllers Instruction Manual December 2011 D200158X012 Neither Emerson Emerson Process Management nor any of their affiliated entities assumes responsibility for the selection use or maintenance of any product Responsibility for proper selection use and maintenance of any product remains solely with the purchaser and end user Fisher is a mark owned by one of the companies in the Emerson Process Management business division of Emerson Electric Co Emerson Process Management Emerson and the Emerson logo are trademarks and service marks of Emerson Electric Co All other marks are the property of their respective owners The contents of this publi
12. In the following step the ends of the springs must be in the counterbored spring seats before compression Instruction Manual 4194S Controllers D200158X012 December 2011 5 Compress the switch body springs with the loader assembly key 282 and bolt the switch key 291 to the loader assembly with the two screws key 290 6 Reconnect the tubing assembly key 309 7 Locate the lever spring key 302 and the spring seat key 301 on the switch lever key 304 and position these parts in the opening of the loader assembly key 282 8 Push the switch lever down using the lever spring seat key 301 and the lever assembly key 297 to preload the spring Make sure the notch of the switch lever engages the pin of the lever assembly 9 Drive in the groove pin key 303 to hold the switch lever 10 Replace the lever cover plate key 305 and attach with two screws key 288 11 Perform the Assembly portion of the Replacing the Auto Manual Station procedure Replacing the Loader Range Spring Diaphragm Assembly Ball Seat Tubing and Ball Refer to figure 5 5 for key number location Disassembly 1 Perform steps 1 through 3 of the replacing case and cover procedure 2 Remove the auto manual station from the controller as described in steps 1 through 4 of the Replacing the Auto Manual Station procedure 3 Remove the tubing assembly key 309 A WARNING To avoid personal injury caused by preload from the range spring key
13. a Turn the span adjustment screw clockwise Adjust the span to correct one half the error b To increase the span further than the adjustment will allow move both ends of link 5 key 88 down one set of holes Refer to figure 4 12 for link location c Make fine adjustments with the span adjustment screw 8 To decrease the span proceed as follows a Turn the span adjustment screw counterclockwise adjust span to correct one half the error b To decrease the span further than the adjustment will allow move both ends of link 5 key 88 up one set of holes c Make fine adjustments with the span adjustment screw 9 Repeat the adjustments until zero and span indications are within 1 percent of input span 10 Check the pointer position at 50 percent of full process pressure input span If the error is greater than 1 percent of input span perform the procedures in the Linearity Adjustment procedure Remove process pressure from the controller 11 Install the proportional band indicator cover key 36 and tighten the two screws key 6 Linearity Adjustment Adjust the linearity by turning the linearity adjustment screw in the curved slot on the lever arm of the short pivot assembly key 89 Adjusting the linearity affects the zero and span 1 Adjust the process differential pressure to 50 percent of input span The process pointer should indicate the 50 percent mark on the scale 2 If the pointer indicates high tur
14. a maintenance guide It summarizes the information available in the maintenance procedures Select the appropriate maintenance procedure and perform the numbered steps Each procedure requires that supply pressure and process pressure be shut off before beginning maintenance When maintenance procedures including Maintenance Calibration and Flapper Alignment have been completed refer to the appropriate prestartup portion in the controller operation procedure Note Unless otherwise noted key numbers refer to figure 5 1 Figures 3 1 and 3 2 show the location of adjustments and major components For maintenance on the indicator assembly refer to figure 5 6 A WARNING The following maintenance procedures require taking the controller out of service To avoid personal injury and property damage caused by uncontrolled process pressure observe the following before performing any maintenance procedures e Always wear protective clothing gloves and eyewear when performing any maintenance procedures to avoid personal injury e Personal injury or property damage may result from fire or explosion if natural gas is used as the supply medium and preventive measures are not taken Preventive measures may include but are not limited to one or more of the following Remote venting of the unit re evaluating the hazardous area classification ensuring adequate ventilation and the removal of any ignition sources For information on remote venting of
15. from the pivot arm see figure 4 12 and from the process pointer assembly Remove the link Attach the replacement link to the process pointer assembly and pivot arm in the position noted in step 2 Adjust the set point manually or with remote set point pressure to 100 percent of the scale range and set the proportional band between DIRECT and REVERSE The process pointer should be lined up with the pointer subassembly as shown in figure 4 13 If not loosen the zero adjustment locking screw Then adjust the fine zero adjustment to align the process pointer and pointer subassembly With a regulated air supply adjust process differential pressure to 50 percent of process scale range The process pointer should be at the 50 1 0 percent position on the scale If not loosen the screw coarse zero adjustment shown in figure 4 12 in the link and move the pointer to 50 percent of process scale and tighten the screw 7 Referto the Maintenance Calibration and Flapper Alignment procedures 8 Install the proportional band indicator cover key 36 and tighten the two screws key 6 36 Instruction Manual 4194S Controllers D200158X012 December 2011 Figure 4 12 Link Location COARSE ZERO ADJUSTMENT W3612 LINK 1 LOCATION 5 LINK 1 LINK 4 LINK 4 ADJUSTMENT LI issi e hung LLL m amp 8 EE S t ibl LINEARITY LINK 2 ADJUSTMENT LINK 2 LINK 3 SCREW
16. not to bend the process indicator or the set point adjustment while performing the following procedure Referto figure 4 3 Adjust the set point adjustment manually or with the remote set point pressure to 50 percent of scale NJ Remove four screws key 37 3 Slide the process scale key 61 so that the top of the slot touches the set point adjustment Deflect the lower portion of the slot and carefully slide the scale upward and off clearing the set point indicator as shown in figure 4 3 24 Instruction Manual 4194S Controllers D200158X012 December 2011 4 To install the replacement scale bend the lower part of the slot slightly so that the scale slides downward over the set point adjustment and under the process indicator 5 Install and tighten the four screws on the scale 6 Aslight zero adjustment see figure 3 1 may be necessary so that the process indicator aligns with the 0 mark on the scale This procedure is described in the Zero and Span Adjustment portion of the Calibration procedures Figure 4 3 Changing the Scale W3440 DEFLECT LOWER PORTION OF THE SLOT Ne AND LIFT THE SCALE UP AND OFF Relay 1 Loosen the two captive screws that hold the relay key 50 in place 2 Tip the relay slightly toward the case to clear the output pressure gauge and lift out the relay 3 Make sure the replacement relay has three O ring assemblies as shown in figure 4 4 The fourth port is for exhaust and d
17. personal injury and property damage Parts Kits Parts List Description Part Number Key Description Part Number 4190 Controller Auto Manual Retrofit Kit see figure 5 4 Contains keys 138 273 312 313 314 315 316 Note SST tubing R4190X00S12 Part numbers are shown for recommended spares only For part numbers not shown contact your Emerson Process Management sales 4190 Controller Auto Manual Repair Kit office see figure 5 5 Contains keys 277 278 279 281 292 293 294 298 306 312 R4190X0AM12 4190 Controller Case Handle Kit G ntrol le rts Contains lever and mounting hardware R4190X00H12 Bourdon Tubes figure 5 1 4190 Controller Repair Kit Contains keys 4 5 7 8 24 52 R4190X00C12 1 Case and cover ass y w o remote set 4190 Controller Pointer and Bracket Repair Kit w remote set Contains pointer and bracket ass y 2 Nameplate aluminum 3 machine screws 3 washers R4190X00P12 3 Frame aluminum 4 Frame gasket chloroprene 18A0749X012 4190 Controller Relay Replacement Kit 5 Gasket chloroprene 18A0742X012 Contains Relay Assembly key 50 6 Machine screw pl steel 9 req d 0 2 to 1 0 bar 3 to 15 psig RRELAYX83C2 7 O Ring nitrile specify quantity req d 1 376206992 0 4 to 2 0 bar 6 to 30 psig RRELAYX83D2 8 O Ring nitrile 3 req d 16A6903X012 9 Flexure pivot assy sapphire SST 10 Machine Screw pl steel 4 req d 11 Input Feedback Beam Assembly zn pl steel 29A9518X012 Fl
18. pressure or reverse increasing differential pressure decreases output pressure Supply and Output Connections 1 4 NPT internal Supply Pressure Requirements See table 1 4 Supply Pressure Medium Air or natural gas Air Supply pressure must be clean dry air that meets the requirements of ISA Standard 7 0 01 A maximum 40 micrometer particle size in the air system is acceptable Further filtration down to 5 micrometer particle size is recommended Lubricant content is not to exceed 1 ppm weight w w or volume v v basis Condensation in the air supply should be minimized Natural Gas Natural gas must be clean dry oil free and noncorrosive H2S content should not exceed 20 Remote Set Point Pressures 0 2 to 1 0 bar 3 to 15 psig or 0 4 to 2 0 bar 6 to 30 psig Controller Adjustments Differential Gap Control 5 to 100 of process scale range Set Point Continuously adjustable from 0 to 10025 of the scale range Steady State Air Consumption 0 to 1 4 Bar 0 to 20 Psig Output 0 1 m hr 3 5 scfh 0 to 2 4 Bar 0 to 35 Psig Output 0 13 m3 hr 5 0 scfh Delivery Capacity 0 to 1 4 Bar 0 to 20 Psig Output 5 6 m hr 210 scfh 0 to 2 4 Bar 0 to 35 Psig Output 9 9 m3 hr 370 scfh Exhaust Capacity 0 to 1 4 Bar 0 to 20 Psig Output 4 6 m hr 170 scfh 0 to 2 4 Bar 0 to 35 Psig Output 7 0 m hr 260 scfh Operative Ambient Temperature Limits 40 to 70 C 40 to 160 F Housing
19. the four screws key 10 shown in figure 4 9 that hold the flexure pivot assembly to the frame Remove the flexure pivot assembly key 9 Install the replacement flexure pivot assembly with the four screws key 10 Do not tighten the screws Instruction Manual 4194S Controllers D200158X012 December 2011 Figure 4 9 Exploded View of Flexure Pivot Assembly 16 14 20 21 22 23 24 25 26 27 28 29 30 FLEXURE PIVOT FOUR SCREWS ASSEMBLY KEY 10 INPUT FEEDBACK BEAM ASSEMBLY 4 W3453 Move the flexure pivot assembly toward the relay as far as possible and tighten the four screws key 10 Place the input feedback beam assembly key 11 onto the flexure pivot assembly key 9 with link 4 through the square hole in the frame Install the screw key 12 with the washer key 13 through the input feedback beam assembly key 11 into the flexure pivot assembly key 9 Do not tighten the screw Align flapper leveling screw number 2 see figure 3 1 for screw location with the centerline of the oblong hole in the frame as shown in figure 4 8 Tighten the screw key 12 Make sure link 4 does not touch the frame Disconnect link number 1 from the pivot assembly and manually position the process pointer to 100 percent of the scale Refer to figure 4 12 for location of link Adjust the length of link number 2 by turning the adjustment screw clockwise to in
20. this controller refer to page 10 e Provide temporary means of control for the process before taking the controller out of service e Shut off the supply pressure to the controller e Disconnect any operating lines providing supply air pressure a process input signal or other pressure source to the controller e Check with your process or safety engineer for any additional measures that must be taken to protect against process media 21 4194S Controllers Instruction Manual December 2011 D200158X012 Figure 4 1 Maintenance Guide Troubleshooting If the controller is not operating properly refer to the troubleshooting chart table 4 1 Then use the appropriate portions of the Maintenance section Replacing Controller Parts Procedures describe replacement of parts in the controller and the input element These procedures may be performed separately but where specified in the text must be followed by Maintenance Calibration for this section and by the Flapper Alignment procedures Flapper Alignment Procedures align the flapper for both direct and reverse controller action Remote Set Point Option M Procedures describe replacement of parts in the remote set point assembly The procedures may be performed separately but must be followed by Maintenance Calibration Auto Manual Option E Procedures describe disassembly and assembly of the auto manual station Controller Operation A description of presta
21. with the hole in the input feedback beam assembly as shown in figure 4 10 The adjustment provides the proper tension on the link Connect the link to the input feedback beam assembly Instruction Manual 4194S Controllers D200158X012 December 2011 8 9 10 Connect link number 1 to the pivot arm Refer to the Maintenance Calibration and Flapper Alignment procedures Replace the proportional band indicator cover key 36 and tighten two screws key 6 Link Number 3 1 2 8 Remove the two screws key 6 and lift off the proportional band indicator cover key 36 Note where the link is connected Disconnect link number 3 from set point adjustment assembly and the set point beam assembly key 23 Install the replacement link with the screw head toward set point beam assembly as shown in figure 4 14 and in the position noted in step 2 Check that set point beam bias spring key 28 is correctly located in frame bore and spring seat on the set point beam assembly as shown in figure 4 5 Adjust the proportional band between DIRECT and REVERSE Manually move the set point adjustment to 50 percent of scale Adjust the screw on the link so that the edge of the proportional band knob is parallel to the set point adjustment as shown in figure 3 1 Refer to the Maintenance Calibration and the Flapper Alignment procedure Replace the proportional band indicator cover key 36 and tighten the two screws key 6
22. 2 to 1 0 bar 3 to 15 psig 0 4 to 2 0 bar 6 to 30 psig Indicator Assembly Capsule Assembly N09902 0 to 350 mbar 3 to 5 psid 0 to 0 7 bar 0 to 10 psid 0 to 1 4 bar 0 to 20 psid 0 to 2 bar 0 to 30 psid Machine Screw pl steel 1 2 req d for 4195SM and SME only Machine Screw 2 pl steel 4 req d Machine Screw pl steel 2 req d Frame Manifold Aluminum for 4194S and SME only Rate Reset Manifold Aluminum Manual Automatic Tubing Assembly for4194SE and SME only Aluminum stainless steel Machine Screw steel for 41945 and SME only Machine Screw Lithium grease not furnished with controller Anti seize sealant not furnished with controller Silicone based lubricant not furnished with controller Lubricant silicone not furnished with controller Machine Screw stainless steel 2 req d Washer Recommended spare parts 1 Use to mount Remote Set assembly to Process Set Point indicator assembly 2 Use to mount Capsular Element assembly to the Process Set Point Indicator assembly Instruction Manual D200158X012 Mounting Parts Key Description Pipestand Mounting 66 Cap Screw pl steel 3 req d 67 Lock Washer pl steel 7 req d 68 Bracket pl steel 69 pl steel 2 req d Panel Mounting 66 Screw pl steel 3 req d 67 Lock Washer pl steel 3 req d 68 Bracket pl steel 70 Machine Screw pl steel 4 req d Wall Mounting 66 Cap Screw pl steel 3 req d 67 Lock Washer
23. 282 turn the loader knob key 287 counterclockwise opposite to the arrow to relieve pressure on the spring 4 Loosen the four screws key 289 and separate the upper loader assembly key 282 and the lower loader assembly key 274 5 Remove the loader range spring key 283 range spring cup key 284 and diaphragm assembly key 281 6 Remove the tube key 278 ball seats key 280 and ball key 279 Assembly 1 Turn the loader knob key 287 counterclockwise to back the spring adjustment screw key 285 all the way out to eliminate loading the range spring 2 Position the range spring cup key 284 range spring key 283 and the diaphragm assembly key 281 on the upper loader assembly key 282 3 Position the ball key 279 the tube key 278 and the ball seats key 280 between the ears of the loader assemblies keys 282 and 274 position the diaphragm assembly key 281 between the main halves of the loader assemblies Note The tube key 278 must be well seated in the cups of the ball seats key 280 53 4194S Controllers Instruction Manual December 2011 D200158X012 4 Boltthe loader assembly halves together using the four screws key 289 Note Be sure that the supply and exhaust seats of the loader are correctly aligned Misalignment will impair loader performance 5 Attach the tubing assembly key 309 6 Perform the Assembly portion of the Replacing the Auto Manual Station procedure Replacing
24. Designed to NEMA 3 weatherproof and IEC 529 IP54 specifications Hazardous Area Classification 4194S differential pressure indicating controllers comply with the requirements of ATEX Group Category 2 Gas and Dust Mounting Controller can be mounted on actuator panel wall or pipestand Approximate Weight 4 5 kg 10 pounds Declaration of SEP Fisher Controls International LLC declares this product to be in compliance with Article 3 paragraph of the Pressure Equipment Directive PED 97 23 EC It was designed and manufactured in accordance with Sound Engineering Practice SEP and cannot bear the CE marking related to PED compliance However the product may bear the CE marking to indicate compliance with other applicable European Community Directives NOTE Specialized instrument terms are defined in ANSI ISA Standard 51 1 Process Instrument Terminology 1 Consult your Emerson Process Management sales office for additional information 2 Normal m3 hour Normal cubic meters per hour at 0 C and 1 01325 bar absolute Scfh Standard cubic feet per hour at 60 F and 14 7 psia 3 Also for transportation and storage limits 4194S Controllers Instruction Manual December 2011 D200158X012 Table 1 2 Available Configurations for Fisher 4194S Controllers CONTROLLER OPTIONS Internal Auto Manual Station Option E Remote Set Point Option M 41945 4194SE X 41945 X 4194SME X X 1
25. If the output pressure snaps to supply pressure above 2 percent of set point adjust flapper leveling screw number 3 counterclockwise 38 Repeat steps 36 and 37 until the output pressure snaps within 2 percent If the tolerance cannot be obtained with the flapper leveling screw go to step 42 39 Adjustthe set point manually or with remote set point pressure to 95 percent of the process scale range 40 If the output pressure is not 0 psi decrease the process differential pressure until the output pressure snaps to zero Then slowly increase the process differential pressure until the output snaps to supply pressure The output should snap to supply pressure within 2 percent of set point 41 If the output pressure snaps to supply pressure within 2 percent of set point go to step 53 If the output pressure does not snap to supply pressure within 2 percent of set point go to step 42 30 Instruction Manual 4194S Controllers D200158X012 December 2011 42 43 44 45 46 47 48 If the output pressure snaps to supply pressure below 2 percent of set point adjust the set point beam shoe key 29 slightly toward the center of the nozzle pivot If the output snaps to supply pressure above 2 percent of set point adjust the set point beam shoe slightly away from the center of the pivot Repeat steps 35 through 42 until the output pressure snaps to supply pressure within 2 percent of set point at 5 and 95 percent on
26. Instruction Manual D200158X012 4194S Controllers December 2011 Fisher 4194S Differential Pressure Controllers Contents Ts IBCEOQUCLDIOR 5525 2 2 Scope 2 Soke 2 SewleaghNs 5 Educational Services 5 i cci scooter putei Gere Be 7 Actuator Mounting Panel Mounting 7 Wall Mounting 7 Pipestand Mounting 7 Pressure Connections 9 PROCESS 9 Supply Pressure 10 10 Remote Set Up Point Pressure Option 10 3 Controller Operation 11 Operating Information 11 Adjustments tete SOM IPEA 11 Manual Set Point 11 Remote Set Point 11 Proportional Band DifferentialGap 11 Changing Controller Action 11 Auto Manual Switching Option E 11 Prestartup lt 12 EU 13 CalIDESLIOLE lt lt 14 Process Zero and Span Adjustment 14 Remote Set Point Zero and Span ODEHOD M tea 14 Setting Switching Points 15 Direct Acting Controllers 15 Rev
27. Loosen the set screw in the travel stop nut key 86 CAUTION Make sure the loose travel stop nut does not bind up on the diaphragm capsule extension when pressurizing the capsules Damage to the capsules may result 2 Full span stop Adjust remote set pressure input to 5 percent greater than full span pressure Loosen the two screws mounting the travel stop key 83 to the mounting plate Slide the travel stop until it is just touching the end of the capsule stack Tighten the travel stop mounting screws to lock it into that position 3 Zero Stop Adjust remote set point pressure input to 0 psig Slide the travel stop nut key 86 along the diaphragm capsule extension key 134 until it is approximately 0 4 mm 1 64 inch away from the travel stop key 83 Tighten the set screw to lock the travel stop nut in that position Aligning the Linkage Adjust the remote set point pressure to the capsules to 50 percent of full span Setthe linearity adjustment screw in the center of the slot on the lever arm of pivot clevis assembly B key 115 1 2 3 Set the length of link key 126 in the middle of its adjustment 4 Set the length of link A key 116 so that the lever arms of pivots A and are parallel and that link is perpendicular to them 5 To complete maintenance calibration the zero and span adjustments must be set Refer to the following section for the procedures If linearity adjustments must also be made ref
28. Refer to Flapper Alignment procedures 1 2 Refer to the Process Zero and Span Adjustment procedures 1 3 Check supply pressure 1 4 Using a soap solution check for leaks 1 5 Using a soap solution check for leaks 2 1 Check output with external gauge 2 2 Check with an external source 2 3 Using soap solution check for leaks 2 4 Using soap solution check for leaks 2 5 Inspect element or linkage for damaged parts 2 6 Manually cap the nozzle output by pushing the flapper toward the nozzle Output should go to supply pressure 2 7 Refer to the Flapper Alignment ortothe Setting Switching Points procedure 3 1 Refer to the Flapper Alignment procedure 3 2 Refer to the Setting Switching Points procedure 3 3 Inspect sensing element and linkage for damaged parts Using soap solution check for leaks 3 4 Inspect links for loose screws and improper connections Ensure links are not rubbing or catching on other parts 3 5 Manually push the flapper away from the nozzle The output should go to zero 41945 Controllers December 2011 Correction 1 1 Align flapper as necessary 1 2 Adjust as necessary 1 3 Provide correct supply pressure 1 4 Repair or replace defective parts 1 5 Repair or replace defective O rings 2 1 Replace gauge if necessary 2 2 Repair or replace pressure regulator if necessary 2 3 Replace defective parts as necessary 2 4 Replace defective parts as necessary 2 5 Repair or rep
29. Reverse acting constructions are designated by an R added to the type number Table 1 3 Process Sensor Capsular Element Pressure Ratings and Materials cu ean DIFFERENTIALSPAN STATIC p NEUSS CAPSULAR Ws TTE OPERATING STANDARD STANDARD RANGES die LIMIT 3 MATERIAL Inches of Mercury bar 09902 e is adjustable between minimum shown and maximum of the capsular element operating range and can be positioned anywhere within this range For if a 0 to 2 0 bar 0 to 30 psi d capsular element is used and the minimum span of 1 0 bar 15 psid 1 0 to 2 0 bar 15 to 30 psid or any value between minimum and maximum value of the operating range 2 Maximum difference between the two input supply pressures 3 Capsular element may be pressured to this value after reaching travel stop at upper range limit without permanent zero shift or structural damage to controller components Table 1 4 Supply Pressure Data OUTPUT SIGNAL RANGE NORMAL OPERATING SUPPLY PRESSURE MAXIMUM PRESSURE TO PREVENT INTERNAL DAMAGE 0 amp 1 4 1 4 0 amp 2 4 i 0835 1 If this pressure is exceeded control stability may be impaired 2 If this pressure is exceeded damage to the controller may result Instruction Manual 4194S Controllers D200158X012 December 2011 Specifications A WARNING This product is intended for a specific current range temperature range and other application specifications Applying different current te
30. TH al O RING INSIDE E RING RETAINING CLIP NOZZLE TUBING ASSEMBLY PROPORTIONAL de O RING BAND ADJUSTMENT m lt SET POINT SET POINT SET POINT NOZZLE W3452 1 PIVOT ASSEMBLY BEAM ASSEMBLY BEAM SHOE FLAPPER EY X w r RETAINING AT CLIP i m e POSITIVE FEEDBACK TUBING ASSEMBLY CAP PROPORTIONAL BAND P ADJUSTMENT KNOB SET POINT BIAS SPRING SHOE ADJUSTMENT SCREWS SET POINT BEAM ASSEMBLY SET POINT LINK 3 RELAY NOZZLE BEAM SHOE TUBING ASSEMBLY W3852 29 4194S Controllers Instruction Manual December 2011 D200158X012 Figure 4 6 Proportional Band Adjustment Knob Figure 4 7 Nozzle Flapper Positioning Setting HOLE FLAPPER NOZZLE W3761 W3449 35 For direct acting controllers adjust the proportional band knob to 5 percent direct acting Adjust the set point adjustment or with remote set point pressure to 5 percent of the process scale range A WARNING In step 36 do not exceed the operating limits of the controller refer to table 1 3 Personal injury or equipment damage may result from overpressure 36 Slowly increase the process differential pressure from zero until the output pressure snaps to supply pressure The output pressure should snap to supply pressure within 2 percent of set point 37 If the output pressure snaps to supply pressure below 2 percent of set point adjust flapper leveling screw number clockwise see figure 3 1 for location of screw
31. X012 JI W N Ov Ul Remove the two screws key 6 and lift off the proportional band cover key 36 Disconnect link number 3 from the set point beam assembly key 23 Refer to figure 4 12 for link location Remove the set point beam bias spring key 28 refer to figure 4 5 for spring location Remove the screw and washer keys 19 and 20 that hold the adjustable set point pivot assembly key 17 to the frame Remove the set point pivot assembly key 17 Disconnect the nut that secures the relay nozzle tubing key 18 into the frame key 3 While holding the proportional band knob remove the screw and washer keys 19 and 20 that hold the relay nozzle tubing assembly key 18 to the frame 8 Remove the proportional band knob nozzle pivot and set point beam assembly from controller 9 Disconnect link number 2 from the input feedback beam assembly key 11 shown in figure 4 8 Refer to figure 4 12 for location of the link Figure 4 8 Leveling Screw Alignment 10 11 12 13 14 15 32 FLAPPER LEVELING INPUT FEEDBACK BEAM SCREW NUMBER 2 ASSEMBLY KEY 11 W3450 FLEXURE PIVOT ASSEMBLY SCREW Disconnect link number 4 from the bellows bracket key 31 Refer to figure 4 12 for location of the link Remove the screw key 12 with washer key 13 from the flexure pivot assembly key 9 See figure 4 8 for screw location Remove the input feedback assembly as shown in figure 4 9 Remove
32. aining clip key 26 and install the E ring key 27 into the E ring groove on the nozzle tubing assembly key 18 Inspect the O ring on the relay nozzle tubing assembly key 18 and replace it if necessary Apply a suitable lubricant to the O ring Install the relay nozzle tubing assembly key 18 into the set point beam assembly Adjust the proportional band between DIRECT and REVERSE Do this by aligning the tab on the proportional band knob with the hole in the set point beam assembly as shown in figure 4 6 Position the proportional band knob nozzle pivot and the set point beam assembly on the frame Install the relay nozzle tubing nut loosely into frame manifold while positioning the nozzle in the center of the flapper as shown in figure 4 7 Insert the screw and washer keys 19 and 20 into the relay nozzle tubing assembly key 18 Refer to figure 4 15 Install the screw key 19 through the frame key 3 and into the relay nozzle tubing assembly key 18 Tighten the screw and make sure the nozzle remains centered on the flapper with the set point beam assembly snugly against the relay nozzle tubing assembly Install the pivot of the set point pivot assembly key 17 in the hole in the set point beam assembly key 23 Install the washer key 20 on the screw key 19 Install the screw and washer keys 19 and 20 through the frame key 3 into the set point pivot assembly key 23 Do not tighten First slide the beam ass
33. and the frame gaskets keys 4 and 5 Disassembly 1 Perform steps 1 through 3 of the replacing case and cover procedure 2 Loosen the screw key 316 that holds the auto manual station key 273 to the controller frame 3 Loosen the two screws keys 314 and 315 that hold the auto manual station to the auto manual tubing assembly key 138 4 Remove the auto manual station from the controller frame Remove the switch manifold O rings key 312 6 Carefully loosen the nut on the relay nozzle tubing assembly key 18 where it connects to the auto manual tubing assembly key 138 Loosen three screws keys 34 and 131 and remove the tubing assembly and frame gaskets keys 4 and 5 7 Inspect the gaskets keys 4 and 5 and O rings key 312 for wear Replace if necessary Ul Assembly 1 Install the gaskets and tubing assembly to the frame Start but do not tighten the three screws keys 34 and 131 and the nut on the relay nozzle tubing assembly key 18 2 Install the three O rings key 312 and secure the auto manual station to the controller frame with the screw key 316 and to the tubing assembly key 138 with the two screws keys 314 and 315 Do not tighten any screws CAUTION In the next step take care to tighten the two screws keys 314 and 315 evenly Uneven tightening could damage the tubing assembly 3 Position the auto manual station as far down on the frame and toward the scale as possible Carefu
34. apper Assembly 12 Machine Screw stainless steel 17 SetPoint Pivot Assembly stainless steel 18 Relay Nozzle Tubing Assembly stainless steel 19 Machine Screw pl steel 2 req d 20 Plain Washer pl brass 2 req d 21 Nozzle Assembly stainless steel 22 Washer 2 req d 23 SetPoint Beam Assembly aluminum stainless steel 25 Proportional Band Knob polycarbonate 26 Retaining clip stainless steel Recommended spare parts 55 4194S Controllers December 2011 37 38 39 41 45 46 47 48 49 50 51 52 53 5 58 59 60 61 62 64 65 71 72 56 Description Part Number E ring pl steel Set Point Beam Bias Spring zn pl steel Set Point Beam Shoe zn pl steel Machine Screw pl steel 2 req d Bellows Bracket aluminum Bellows Adjustment Bracket zn pl steel Bellows Adjustment Spring zn pl steel Machine Screw pl steel 2 req d Machine screw pl steel 2 req d Proportional Band Indicator Cover polyester plastic Self Tapping Screw steel 4 req d Self Self Tapping Screw pl steel 9 req d Supply Gauge Tubing Assembly Stainless steel brass Plug Stainless steel Positive Feedback Tubing Assembly Stainless steel brass See following table See following table Output Gauge Supply Gauge Bellows assy 2 req d Brass aluminum Stainless steel aluminum Bellows Beam aluminum 0 2 to 1 0 bar 3 to 15 psig 0 4 to 2 0 bar 6 to 30 psig 16 6953 012 16 6953 022 Relay Asse
35. cation are presented for informational purposes only and while every effort has been made to ensure their accuracy they are not to be construed as warranties or guarantees express or implied regarding the products or services described herein or their use or applicability All sales are governed by our terms and conditions which are available upon request We reserve the right to modify or improve the designs or specifications of such products at any time without notice Emerson Process Management Marshalltown lowa 50158 USA Sorocaba 18087 Brazil Chatham Kent ME4 4QZ UK Dubai United Arab Emirates Singapore 128461 Singapore www Fisher com E M ERSON Process Manaaement EM 1983 2011 Fisher Controls International LLC All rights reserved ee
36. crease the length or counterclockwise to decrease the length so that the pin on the end of the link is approximately one half of its diameter short of aligning with the hole in the input feedback beam assembly as shown in figure 4 10 Connect link number 2 to the input feedback beam assembly Connect link number 1 to the pivot assembly Adjust the proportional band between DIRECT and REVERSE Do this by aligning the tab on the proportional band knob with the hole in the set point beam assembly as shown in figure 4 6 Position the proportional band knob nozzle pivot and set point beam assembly on the frame and install the relay nozzle tubing fitting loosely into frame manifold while positioning the nozzle in the center of the flapper as shown in figure 4 7 Install the screw key 19 through the frame key 3 into the set point pivot assembly key 23 Do not tighten Slide the set point pivot assembly key 17 toward the set point beam until the cone lightly contacts the set point beam and tighten the screws The proportional band should fall freely when the controller is in the upright position If it does not reposition the set point pivot assembly key 17 Tighten the relay nozzle tubing nut key 18 Apply supply pressure and check for leaks Disconnect the supply pressure Install the washer key 20 on the screw key 19 Install the screw key 19 through the frame key 3 and into the relay nozzle tubing assembly key 18 Tighten the
37. de the controller frame down to assure an O ring seal at the pressure connections Hold the frame in place Install and tighten the nine screws that hold the controller assembly in the case Refer to the Flapper Alignment procedures Replace the proportional band cover key 36 and replace the two screws key 6 Positive Feedback Bellows Note The following procedure requires that the controller be removed from the case Perform steps 1 through 3 of the replacing case and cover procedure Both bellows need not be removed if only one requires replacement 34 Instruction Manual 4194S Controllers D200158X012 December 2011 1 Remove the two screws key 6 and lift off the proportional band indicator cover key 36 2 Disconnect link 4 key 65 from the bellows bracket key 31 3 Remove the screw key 34 spring key 33 and bellows adjustment bracket key 32 from the bellows bracket key 31 4 Refer to figure 4 11 for locations Remove two screws key 35 from the bellows assembly Figure 4 11 Cutaway View of Bellows Assembly RESET BELLOWS TWO SCREWS KEY 35 PROPORTIONAL BELLOWS BELLOWS BRACKET LINK 4 4 7 za e P Gu 0p 57 EE JY v in o FOUR SCREWS KEY 6 W3448 5 Remove the four screws key 6 from the bellows beam key 49 and remove the bellows bracket 6 Remove the positive feedback tubing assembly key 45 from the positive feedback bellows
38. drive flexure 5 Remove the screw keys 122 the washer key 123 and the nut key 124 that attach the quide flexure to the top of the pivot assembly 6 Remove the pivot screw and spring washer keys 109 and 112 and the mounting screw key 102 attaching the pivot assembly to the mounting plate Lift out the pivot assembly 7 Loosen the screw key 118 on the adjustment arm of the replacement pivot assembly and set the arm to the same length as the arm on the pivot assembly being replaced Tighten the screw 8 Toreplace the pivot assembly first put the spring washer on the screw Then install the screw through the pivot assembly into the mounting plate 9 Connect the guide flexure to the top of the new pivot assembly with the screw key 122 the washer and the nut as it was before 10 Increase the remote set point pressure to 50 percent of input span 11 Connect the drive flexure to the arm on the new pivot assembly making sure it stays straight and horizontal Before tightening down the drive flexure set the pivot in the middle of the bushing end play Tighten down the drive flexure to hold the pivot in that position Do not kink or twist the flexure when tightening the screws Adjust the length of the pivot arm if necessary until the flexure is straight 12 Decrease the remote set point pressure to 0 psig 13 Connectthe end of link A key 116 to the pivot lever arm in the same position noted in step 3 14 Replace the t
39. e do not exceed the operating limits given in this manual If the prestartup checks revealed faulty adjustment of the process indicator perform the calibration procedures These procedures are valid for either shop or field calibration provided that open process loop conditions exist Note If the controller has the auto manual option be sure the controller is in the automatic mode prior to performing the calibration procedure Process Zero and Span Adjustment Note Any adjustment of the pointer span adjustment screw will require readjustment of the pointer zero adjustment screw Refer to figure 3 1 for location of adjustments Remove the two screws key 6 and lift off the proportional band indicator cover key 36 Set the proportional band between DIRECT and REVERSE Adjust the process differential pressure to the low limit of the input range A W N Adjust the process pointer to the lowest limit of the input scale by loosening the zero adjustment locking screw and turning the zero adjustment screw Adjust the process differential pressure to the upper limit of the input span Note whether the pointer indication is above or below the upper limit of the process scale 7 Adjust the span screw as follows Clockwise to increase span for a low indication counterclockwise to decrease span for a high indication Adjust the span screw to correct one half the error 8 Repeat steps 4 through 7 until the er
40. e plate key 111 travel stop key 83 or pedestal assembly key 105 Align the replacement assembly with the mounting screw holes Replace the mounting screws Reconnect the process pressure connection union key 93 Apply remote set point pressure and check for leaks Connect the link key 126 to the pivot hole on the set point indicator assembly Replace the supply pressure gauge O co Refer to the Maintenance Calibration procedure LinkA 1 Note the holes where link A key 116 is connected see figure 5 3 Disconnect both ends of the link from the lever arms on the two pivots 2 Loosen the screw in the replacement link and adjust the length to match the link being replaced Tighten the screw Refer to figure 5 3 for correct orientation of the link 3 Attach the replacement link to the two lever arms in the same position as noted in step 1 4 Check the zero setting and adjust if necessary as described in the Zero and Span Adjustment procedure Link B 1 Note the holes where link B key 126 is connected see figure 5 3 Disconnect both ends of the link from the pivot arm and from the set point indicator assembly 2 Loosen the screw in the replacement link and adjust the length to match the link being replaced Tighten the screw 3 Attach both ends of the replacement link Refer to figure 5 3 for correct orientation of the link and position the link as noted in step 1 4 Refer to the Maint
41. embly snugly toward the relay tubing assembly then slide the set point pivot assembly key 17 toward the set point beam until the cone lightly contacts the set point beam and tighten the screw The proportional band knob should fall freely when the controller is in the upright position If it does not reposition the set point pivot assembly key 17 until the proportional band knob falls freely Tighten the nut on the relay nozzle tubing assembly key 18 apply supply full pressure and check for leaks Disconnect supply pressure Install the set point beam bias spring key 28 into the frame bore and onto the spring seat on the set point beam assembly see figure 4 5 Attach link number 3 to the set point assembly key 23 See figure 4 12 If the position of the set point beam shoe see figure 4 5 was changed relative to the set point beam assembly key 23 go to step 33 If the position of the set point beam shoe was not changed go to step 53 Connect supply pressure and regulated process differential pressure to the controller Also provide a means of measuring controller output pressure Perform the procedures Then proceed as directed by the following note Note For direct acting controllers go to step 35 For reverse acting controllers go to step 44 28 Instruction Manual 4194S Controllers D200158X012 December 2011 Figure 4 5 Proportional Band Adjustment and Set Point Beam Details TAB Y CAP WI
42. enance Calibration procedure Maintenance Calibration Note Perform all Maintenance Calibration procedures upon completion of maintenance If only zero span and linearity adjustments are required use only those sections After Maintenance Calibration go to the appropriate prestartup instructions in the controller operation procedures A WARNING Refer to the Maintenance WARNING on page 21 Refer to figure 3 2 for parts location Key numbers refer to figure 5 3 Precalibration Procedure 1 Set the proportional band adjustment between DIRECT and REVERSE 2 Remove the tie bar key 106 48 Instruction Manual 4194S Controllers D200158X012 December 2011 3 Apply 50 percent of full span remote set point pressure 4 The drive flexure key 79 should be straight If not proceed as follows a Loosen the screw on the adjustment arm on pivot assembly A key 114 and the screws holding the drive flexure b Setthe length of the adjustment arm so that the drive flexure is parallel to the centerline of the capsules c Tighten the screw on the adjustment arm d Set pivot A in the middle of the bushing end play e Tighten the screws that hold the drive flexure in place 5 The quide flexure should also be straight If not loosen the screw key 122 on the end of the flexure that is attached to the top of pivot A key 114 and allow the flexure to straighten itself Tighten screw on the flexure Setting the Travel Stops 1
43. er to that portion of this section 6 Replace the tie bar key 106 7 Refer to the Flapper Alignment procedure Zero and Span Adjustment 1 Decrease remote set point pressure to 0 psig 2 Loosen the screw on link A key 116 and adjust the length so that the set point pointer points to scale zero Tighten the screw 49 4194S Controllers Instruction Manual December 2011 D200158X012 3 Make fine zero adjustments by loosening the zero adjustment locking screw and turning the zero adjustment screw key 108 Tighten the locking screw Refer to figure 5 3 for location of the screws 4 Apply 100 percent of the remote set pressure input span 5 To increase the span proceed as follows a Turn the span adjustment screw clockwise Adjust span to correct one half the error b To increase the span further than the adjustment screw allows move both ends of link A to the right Refer to figure 5 3 for link location c Make fine adjustments with the span adjustment screw 6 To decrease the span proceed as follows a Turn the span adjustment screw counterclockwise Adjust span to correct one half the error b To decrease the span further than the adjustment screw allows move both ends of link A to the right Refer to figure 5 3 for link location c Make fine adjustments with the span adjustment screw 7 Repeat the adjustments until the zero and span indications are within 1 percent of input span 8 Check the
44. erse Acting Controllers 17 Principle of Operation 17 Overall Operation 17 Remote Set Point 19 Auto Manual Option 19 21 Troubleshooting 22 Changing Controller Action 23 Replacing Controller lt 24 Process Pressure Scale 24 Relay 25 Case Cover 26 20 Pressure Control Block 26 www Fisher com Figure 1 1 Fisher 4194S Differential Pressure Controllers W5663 1 W3613 Supply Tubing and Positive Feedback Tubing Assemblies 27 Proportional Band Knob Nozzle Assembly and Set Point Beam Assembly 27 Flapper Flexure Pivot Assembly 31 Positive Feedback Bellows 34 LIIS iod bata tn 36 Link 1 36 Linc NUrmbek 2 gt tonne 38 s EMERSON Process Management 4194S Controllers December 2011 Contents cont d Eine N rpDer 3 RUE 39 Link 4 39 Link 5 40 Long Pivot Assembly 40 Short Pivot Assembly 40 Process Drive Flexure
45. eveling screw number 1 counterclockwise If the output snaps to supply above 2 percent of set point adjust flapper leveling screw number 1 clockwise 13 Repeats steps 11 and 12 until the output pressure snaps within 2 percent of set point 14 Repeat steps 3 through 13 to recheck adjustments Continue to adjust flapper leveling screws 1 2 and 3 as necessary until no flapper adjustments are required 15 Setthe proportional band adjustment to 400 percent in the desired controller action Replace the proportional band indicator cover key 36 and tighten the two screws key 6 Remote Set Point Option M Replacing Parts A WARNING Refer to the Maintenance WARNING on page 21 Note After part replacement perform the Maintenance Calibration procedures Figure 3 2 shows the location of the parts Key numbers refer to figure 5 3 45 4194S Controllers Instruction Manual December 2011 D200158X012 Pivot Assembly A Key 114 CAUTION Avoid bending or kinking the drive flexure during the following procedure Bending or kinking the drive flexure can result in product damage as well as impaired performance 1 Decrease the remote set point pressure to 0 psig 2 Remove the tie bar key 106 3 Note where link A key 116 is connected Disconnect the link from the lever arm on the pivot assembly 4 Disconnect the drive flexure key 79 from the adjustment arm of the pivot assembly Be careful not to bend or kink the
46. ferential pressure until the output pressure snaps to supply pressure The output should snap to supply pressure within 2 percent of set point If the output pressure snaps to supply pressure within 2 percent of set point go to step 53 If the output pressure does not snap to supply pressure within 2 percent go to step 51 If the output pressure snaps to supply pressure below 2 percent of set point adjust the set point beam shoe key 29 slightly toward the center of the nozzle pivot If the output pressure snaps to supply pressure above 2 percent of set point adjust the set point beam shoe slightly away from the center of the nozzle pivot Repeat steps 44 through 51 until the output pressure snaps to supply pressure within 2 percent of set point at 5 and 95 percent of the process scale range then go to step 53 Install the controller assembly in the case Slide the controller frame down to assure an O ring seal at the pressure connections Hold the frame in place Install and tighten the nine mounting screws that hold the controller assembly in place Refer to the Flapper Alignment procedures Replace the proportional band indicator cover key 36 and tighten the two screws key 6 Flapper Flexure Pivot Assembly Note The following procedure requires that the controller be removed from the case Perform steps 1 through 3 of the replacing case and cover procedure 31 4194S Controllers Instruction Manual December 2011 D200158
47. ge 10 e Check with your process or safety engineer for any additional measures that must be taken to protect against process media e If installing into an existing application also refer to the WARNING at the beginning of the Maintenance section in this instruction manual Actuator Mounting Refer to figure 2 1 Controllers specified for mounting on a control valve actuator will be mounted at the factory If the controller is ordered separately for installation on a control valve actuator mount the unit as described in this section Mounting parts vary for different actuator types Attach the mounting bracket to the actuator yoke with cap screws lock washers and spacer spools Attach the controller to the bracket with cap screws lock washers and spacer spools On some designs the mounting bracket is attached to the actuator casing rather than to the yoke Panel Mounting Refer to figure 2 2 Cut a hole in the panel surface using the dimensions shown in figure 2 2 Slide the controller into the hole and attach the bracket key 68 to the rear of the controller using three cap screws key 66 and lock washers key 67 Tighten the screws key 70 to draw the case snugly and evenly to the panel surface Wall Mounting Refer to figure 2 3 Drill holes in the wall using the dimensions in figure 2 3 to align with the four holes in the bracket key 68 If the process tubing is to run through the wall drill a hole in the wall large enou
48. gh to accept the tubing Mount the controller to the bracket using three cap screws key 66 and lock washers key 67 Attach the bracket to the wall using suitable screws or bolts Pipestand Mountinq Refer to figure 2 4 Pipestand mounting parts are provided to mount the controller to an NPS 2 nominal pipe Attach a bracket key 68 to the controller with cap screws key 66 and lock washers key 67 Attach two clamps key 69 to the bracket and fasten the controller to the pipe 4194S Controllers Instruction Manual December 2011 D200158X012 Figure 2 1 Typical Actuator Mounting Figure 2 3 Wall Mounting SPACER SPOOLS CAP SCREWS AND LOCKWASHERS MOUNTING BRACKET REAR VIEW 36A9761 A A2759 4 mm INCH W5661 Figure 2 2 Panel Mounting Figure 2 4 Pipestand Mounting VERTICAL PIPE 236 9 31 DIMENSIONS OF PANEL CUTOUT mm 36A9780 A 36A9758 A A2757 4 INCH A2869 1 REAR VIEW HORIZONTAL PIPE Instruction Manual 4194S Controllers D200158X012 December 2011 Pressure Connections A WARNING Overpressuring any system component including the capsular sensing element could result in personal injury or property damage due to fire and explosion caused by venting or leakage of a hazardous supply pressure medium or process medium To avoid such injury or damage provide suitable pressure relieving or pressure limiting devices if supply pressure or process pressure is capable of exceeding
49. he process Adjusting the set point varies the pressure on the left hand side of the plastic tube Adjusting the manual loader knob varies the pressure on the right hand side When the pressures are equal the metal ball is centered in the tube Pressure imbalance forces the ball to one end of the tube where it forms a seal blocking air flow through the tube Figure 3 5 Schematic of Auto Manual Option AUTOMATIC POSITION MANUAL LOADER TE i SWITCH Stat frees IINE H MANUAL LOADER KNOB rus EE sone et ATTE Hi OUTPUT PRESSURE p TO FINAL CONTROL ELEMENT se p dm BS PES erm MANUAL POSITION RELAY PE B AUTO MANUAL SUPPLY SWITCH PRESSURE OUTPUT PRESSURE RELAY OUTPUT PRESSURE TO FINAL CONTROL Reseed SUPPLY PRESSURE FRENTE 4 MANUAL LOADER OUTPUT PRESSURE 48A5230 A 2999 1 4194S Controllers December 2011 20 Instruction Manual D200158X012 Instruction Manual 4194S Controllers D200158X012 December 2011 Section 4 Maintenance Parts are subject to normal wear and must be inspected and replaced as necessary The frequency of inspection and parts replacement depends upon the severity of the service conditions When inspection or repairs are required disassemble only those parts necessary to accomplish the job Figure 4 1 is
50. herwise go to the appropriate prestartup instructions in the controller operation procedures A WARNING Refer to the Maintenance WARNING on page 21 Precalibration Procedures 1 Set the proportional band adjustment to 5 percent direct acting Adjust the set point to 100 percent of the process scale range 2 Remove the tie bar key 97 Aligning the Drive Bracket Assembly 1 Loosen the set screw in the hex nut key 86 of the drive bracket assembly key 84 2 Loosen the screw key 98 that holds the guide flexure to the tab on the mounting plate 3 Adjust the input pressure to 75 percent of full differential pressure span 4 Slide the drive bracket assembly key 84 along the diaphragm capsule extension key 82 until the guide flexure is aligned with the center of pivot A key 78 5 Tighten the set screw in the hex nut to fasten the drive bracket assembly in that position Setting the Travel Stops 1 Loosen the set screw in the travel stop nut key 86 CAUTION Make sure the loose travel stop nut does not bind up on the diaphragm capsule extension when pressurizing the capsules Damage to the capsules may result 42 Instruction Manual 4194S Controllers D200158X012 December 2011 2 Full span stop Adjust process differential pressure to 5 percent greater than full span pressure Loosen the screws key 139 mounting the travel stop key 83 to the mounting plate Slide the travel stop until it is just touching
51. ie bar key 106 15 Referto the Maintenance Calibration procedure Pivot Assembly B Key 115 1 Refer to figure 5 3 for the key numbered assembly 2 Decrease the remote set point pressure to 0 psig 3 Note where the links are connected Disconnect the links keys 116 and 126 from the arms of pivot assembly key 115 4 Remove the two screws key 102 attaching the pivot assembly to the mounting plate key 111 Remove the pivot assembly 5 Loosen the linearity adjustment screw on the replacement pivot assembly and set it in the same position as the adjustment on the original pivot assembly Tighten the screw 6 Setthe replacement pivot assembly on the mounting plate and attach it with the two machine screws 7 Attach the links keys 116 and 126 to the arms of the new pivot assembly in step 3 46 Instruction Manual 4194S Controllers D200158X012 December 2011 8 Referto the Maintenance Calibration procedure Drive Flexure 1 Disconnect the flexure key 79 from the drive bracket key 121 and from the adjustment arm of pivot assembly A Remove the screws and washer key 12 and 13 remove the flexure 2 Set remote set point pressure at 50 percent of input span CAUTION Avoid bending or kinking the drive flexure Bending or kinking the drive flexure can result in product damage as well as impaired performance 3 Connect the new flexure making sure it stays straight and horizontal Before tightening the drive flex
52. ighten the two adjusting screws on the link 7 Referto the Maintenance Calibration and the Flapper Alignment procedure 8 Replace the proportional band indicator key 36 and tighten two screws key 6 Link Number 5 1 Referto figure 5 2 for key number locations 2 Note where the link is connected Disconnect both ends of link 5 key 88 from the lever arms of the two pivot assemblies 3 Loosen the adjustment screw on the replacement link and adjust the length to match the original link Tighten the adjustment screw 4 Attach the replacement link to the two lever arms in the same location as noted in step 2 5 Referto the Maintenance Calibration procedure Long Pivot Assembly 1 Remove the process pressure from the controller 2 Remove the tie bar key 97 3 Note where the link is connected Disconnect link 5 key 88 from the lever arm on the pivot assembly key 78 CAUTION Avoid bending or kinking the drive flexure Bending or kinking the drive flexure can result in product damage as well as impaired performance 4 Disconnect the drive flexure key 79 from the adjustment arm of the pivot assembly Take care not to bend or kink the drive flexure 5 Remove the two screws key 102 attaching the pivot assembly to the mounting plate key 77 6 Loosen the screw on the adjustment arm of the replacement pivot assembly and adjust the arm to the same length as the arm on the pivot assembly being replaced 7 At
53. ing the position of the lower switching point On a reverse acting controller changing the proportional band adjustment will widen or narrow the differential gap between the two switching points This is accomplished by changing the position of the upper switching point Instruction Manual 4194S Controllers D200158X012 December 2011 Remote Set Point Option The capability to adjust the controller set point from a remote location is available with all 4194S controllers This option is designated by the letter M in the type number Auto Manual Option Controllers with the auto manual option designated by the letter E in the type number have piping on the output side of the relay as shown in figure 3 5 Supply pressure to the relay is also applied to the manual loader The manual loader functioning as a regulator applies pressure to one side of the plastic tube and to the auto manual switch Output pressure from the relay registers on the other side of the plastic tube as well as in the auto manual switch When the auto manual switch is in the MANUAL position the output of the manual loader is channeled through the auto manual switch and becomes the output of the controller When the auto manual switch is in the AUTO position the output of the relay is channeled through the switch to become the output of the controller Before the auto manual switch is operated the output of the relay must equal the manual loader output to avoid bumping t
54. lace damaged parts 2 6 If output does not change as described remove relay Replace O rings if necessary Replace relay if necessary 2 7 Make alignments and adjustments as necessary 2 8 Refer to the maintenance procedures for link adjustment 3 1 Align flapper as necessary 3 2 Adjust switching as necessary 3 3 Repair or replace faulty parts 3 4 Replace links as necessary 3 5 Replace the relay If the output still does not go to zero replace the nozzle pivot assembly 1 Loosen two screws key 6 in the proportional band indicator cover key 36 The screws need not be removed 2 Lift the proportional band indicator cover as shown in figure 4 2 3 Rotate the proportional band knob key 25 to the desired controller action 4 Install the proportional band indicator cover key 36 and tighten the two screws key 6 23 4194S Controllers Instruction Manual December 2011 D200158X012 Figure 4 2 Changing Controller Action W3439 Replacing Common Controller Parts A WARNING To avoid personal injury or property damage caused by the uncontrolled release of pressure be sure any trapped process pressure is properly vented from the controller Vent any supply pressure from the controller before disassembly A WARNING Refer to the Maintenance WARNING on page 21 before replacing any common controller parts Process Pressure Scale CAUTION To prevent inaccurate indication and operation take care
55. ler output switches at desired points 8 Observe the process pointer when the output switches at the lower switching points The process pointer indication should be within 2 percent of the set point indication If the output does not snap within 2 percent of set point refer to the calibration procedures Principle of Operation Overall Operation Refer to the schematic diagram in figure 3 4 4194S Controllers Instruction Manual December 2011 D200158X012 Figure 3 4 Schematic of Operation for Fisher 4195S Controllers SET POINT POSITIVE FEEDBACK INDICATOR BELLOWS REVERSE ACTION PROPORTIONAL QUADRANT SL EAR PROPORTIONAL BAND ADJUSTMENT PROCESS POINTER Tac BACK REMOTE SET POINT M CONNECTED HERE INPUT ELEMENT 95 MOTION ES CONNECTED HERE PIVOT CONNEC INPUT MOTION LINK v BS FLAPPER DETAIL SN OUTPUT PRESSURE 2 4 FINAL CONTROL gt ELEMENT FLAPPER SUPPLY PRESSURE NOZZLE 7 7 2 RELAY 058 OUTPUT PRESSURE uf SUPPLY POSITIVE FEEDBACK PRESSURE PRESSURE 0252251 NOZZLE PRESSURE B1546 2 The input element is connected to the process pointer and to the flapper by connecting links As the process pressure increases in a direct acting controller the flapper moves toward the nozzle restricting flow through the nozzle and increasing nozzle pressure When this occurs relay action increases the output pressure delivery of the controller
56. ller 2 Disconnect link 1 key 90 from the pointer Note the hole location in the pivot and pointer assembly 3 Disconnect the process pressure connection key 93 from the pedestal assembly key 81 4 Remove the four mounting screws key 127 that attach the capsular element to the process set point indicating assembly CAUTION In the following step do not lift out the capsular element by holding the capsular element or linkages These parts are easily damaged 41 4194S Controllers Instruction Manual December 2011 D200158X012 5 Lift out the capsular element assembly by holding the plate key 77 travel stop key 83 or pedestal key 81 6 Align the replacement capsular element assembly over the mounting screw holes Install and tighten the mounting screws 7 Reconnect link 1 key 90 to the pointer subassembly in the same hole noted in step 3 8 Reconnect the process pressure connections 9 Apply process differential pressure to the controller and check for leaks 10 Refer to the Maintenance Calibration procedure Maintenance Calibration Note Perform full maintenance calibration includes all procedures upon completion of maintenance procedures If only zero and span or linearity adjustments are required use only those sections Key numbers are referenced in figures 5 1 and 5 2 Adjustments are shown in figure 3 1 After Maintenance Calibration perform the Flapper Alignment procedures if directed to do so Ot
57. lly tighten the two screws keys 314 and 315 so that the auto manual station contacts the three pads on the tubing assembly 4 Carefully tighten the remaining screws and nuts Apply air pressure to the controller and check for leaks 6 Install the controller assembly in the case Slide the controller frame down to assure an O ring seal at the pressure connections Hold the frame in place 7 Install and tighten the nine screws that hold the controller assembly in the case 8 Refer to the Flapper Alignment procedure Replacing the Switch Body Assembly Lever O Ring Switch Body O Ring and the Tubing Assembly Refer to figure 5 5 for key number location 51 4194S Controllers Instruction Manual December 2011 D200158X012 Disassembly 1 Perform steps 1 through 3 of the replacing case and cover procedure 2 Remove the auto manual station from the controller frame as described in steps 1 through 4 of the Replacing the Auto Manual Station procedure 3 Loosen the two screws key 288 and remove the lever cover plate key 305 WARNING The lever spring key 302 is under preload To avoid personal injury or losing parts carefully disassemble the auto manual station 4 Using a 1 5 mm 0 0625 inch punch push the groove pin key 303 out toward the surface of the lever cover plate 5 Remove the switch lever key 304 lever spring key 302 and lever spring seat key 301 6 Remove the tubing assembly key 309
58. losion of accumulated gas or from contact with hazardous gas if a flammable or hazardous gas is used as the supply pressure medium Because the controller case and cover assembly do not form a gas tight seal when the assembly is enclosed a remote vent line adequate ventilation and necessary safety measures should be used to prevent the accumulation of flammable or hazardous gas However a remote vent pipe alone cannot be relied upon to remove all flammable or hazardous gas Vent line piping should comply with local and regional codes and should be as short as possible with adequate inside diameter and few bends to reduce case pressure buildup CAUTION When installing a remote vent pipe take care not to overtighten the pipe in the vent connection Excessive torque will damage the threads in the connection If a remote vent is required the vent line must be as short possible with a minimum number of bends and elbows Vent line piping should have a minimum inside diameter of 19 mm 3 4 inches for runs up to 6 1 m 20 feet anda minimum inside diameter of 25 mm 1 inch for runs from 6 1 to 30 5 m 20 to 100 feet If a remote vent is not required the vent opening figure 2 5 must be protected against the entrance of any foreign material that could plug it Check the vent periodically to be certain it is not plugged 10 Instruction Manual 4194S Controllers D200158X012 December 2011 Section 3 Controller Operation Operating Informati
59. mbly included in the Replay Replacement kit Relief Valve Cover Plate aluminum O ring nitrile Machine screw pl steel 2 req d Process Set Point Indicator Assembly Pressure Control Block 316 stainless steel 2 req d w o remote set 3 req d w remote set 10853806992 Cap screw pl steel 2 req d w o remote set 4 req d w remote set Hex Reducing Nipple 2 req d use only when specified Steel Stainless steel Reducing Adaptor 2 req d use only when specified Steel Stainless steel Process scale aluminum Remote set assembly for 4194SM and SME only N09902 or Stainless Steel 0 2 to 1 0 bar 3 to 15 psig 0 4 to 2 0 bar 6 to 30 psig Machine screw pl steel 4 req d Feedback Link Assembly Machine screw pl steel 4 req d Blowout plug silicone Instruction Manual D200158X012 Key 46 47 Pressure Gauge RANGE GAUGE MATERIAL Dual Scale Gauge 0 to 30 psig 0 to 2 kg cm2 0 to 60 psig 0 to 4 kg cm 11B8577X042 11B8583X032 11B8577X052 Triple Scale Gauge 0 to 30 psig 0 to 200 kPa 0 to 2 bar 11B8577X012 11B8583X012 0 to 60 psig 0 to 400 kPa 0 to 4 bar 11B8577X022 11B8583X022 1 One type of pressure gauge is used for both output pressure and supply pressure indication Key 80 101 113 120 127 131 135 136 138 140 162 310 311 317 318 338 362 Description Diaphragm Capsule Assembly for 4194SM and SME only not shown N09902 or Stainless Steel 0
60. mperature and other service conditions could result in malfunction of the product property damage or personal injury Specifications for 41945 controllers are listed in table 1 1 Educational Services For information on available courses for 41945 controllers as well as a variety of other products contact Emerson Process Management Educational Services Registration P O Box 190 301 S 1st Ave Marshalltown IA 50158 2823 Phone 800 338 8158 or Phone 641 754 3771 FAX 641 754 3431 e mail education emerson com 4194S Controllers Instruction Manual December 2011 D200158X012 Instruction Manual 4194S Controllers D200158X012 December 2011 Section 2 Installation The controllers should be mounted with the housing vertical as shown in figure 2 1 so that the vent points down A WARNING To avoid personal injury or property damage from sudden release of process pressure e Always wear protective clothing gloves and eyewear when performing installation and maintenance procedures e Personal injury or property damage may result from fire or explosion if natural gas is used as the supply medium and preventive measures are not taken Preventive measures may include but are not limited to one or more of the following Remote venting of the unit re evaluating the hazardous area classification ensuring adequate ventilation and the removal of any ignition sources For information on remote venting of this controller refer to pa
61. n the linearity screw counterclockwise in the slot If the pointer indicates low turn the linearity screw clockwise in the slot 3 Checkthe zero and span as described in the Zero and Span Adjustment procedures and make any necessary adjustments 4 Repeat steps 1 through 3 until zero span and linearity indications are within 1 percent of input span Flapper Alignment Refer to the Maintenance WARNING on page 21 Leveling screws numbers and adjustments are shown in figure 3 1 Provide a means of applying process differential pressure and supply pressure to the controller and a means of measuring output pressure After flapper alignment go to the appropriate prestartup instructions in the controller operation procedures 1 For controllers with manual set point move the set point adjustment to 50 percent of the scale range For controllers with remote set point option M adjust the remote set point pressure until the set point indicator is at 50 percent of the scale range 2 Remove the two screws key 6 and lift off the proportional band indicator cover key 36 3 Adjust the proportional band adjustment to 5 percent direct acting 44 Instruction Manual 4194S Controllers D200158X012 December 2011 A WARNING In step 4 do not exceed the operating limits for the controller refer to table 1 3 Personal injury or equipment damage may result from overpressure 4 Slowly increase the process differential pressure from zero u
62. ng the screws on the proportional band indicator cover and moving the cover out so the proportional band knob can be rotated to the desired action The white portion of the adjustment enables direct controller action the black portion enables reverse controller action Auto Manual Switching Option E Refer to figure 5 4 if the controller has the auto manual option Two balance methods are available to equalize the manual output with the controller pressure To switch from automatic to manual mode carefully adjust the loader knob until the metal ball inside the plastic tube moves into the switching zone Then move the automatic manual switch to MANUAL Turn the loader knob clockwise to increase the controller output or counter clockwise to decrease it To switch from manual to automatic mode adjust the set point manually or with remote set point pressure to move the ball into the switching zone Turn the switch to AUTOMATIC and move the set point adjustment to control the output 4194S Controllers Instruction Manual December 2011 D200158X012 When the automatic manual switch is in AUTOMATIC adjusting the loader knob has no effect on the controller output When the automatic manual switch is in MANUAL changing the set point adjustment has no effect on the controller output Note Switching the controller between automatic and manual mode without balancing can disturb the process and cause controller cycling Prestartup Checks When pe
63. ntil the output pressure snaps to supply pressure The output pressure should snap to supply pressure within 2 percent of set point 5 If the output snaps to supply pressure below 2 percent of set point adjust flapper leveling screw number clockwise If the output snaps above 2 percent of set point adjust flapper leveling screw number 3 counterclockwise 6 Repeat steps 4 and 5 until the output pressure snaps within 2 percent of set point 7 Adjust the proportional band adjustment between DIRECT and REVERSE 8 If the output pressure snaps to supply pressure depress the flapper with a screwdriver so the output pressure snaps to zero pressure Slowly release the flapper If the output snaps to supply pressure adjust flapper leveling screw number 2 clockwise until the output does not snap to supply pressure Then adjust screw number 2 counterclockwise 1 8 of a turn at a time until the output snaps to supply pressure 9 Repeat step 8 to recheck the adjustment of flapper leveling screw number 2 10 Adjust the proportional band adjustment to 5 percent reverse acting 11 Carefully adjust the process differential pressure to 100 percent of the process scale range Then slowly decrease the process pressure until the output pressure snaps to supply pressure the output pressure should snap to supply pressure within 2 percent of set point 12 If the output pressure snaps to supply pressure below 2 percent of set point adjust flapper l
64. ocation of Controller Parts and Adjustments Remote Set Point Option 3 1 GUIDE PIVOT FLEXURE MOUNTING ADJUSTMENT ASSEMBLY A SCREW SCREW Q lo eX gt f 1 S A 2 4929 hy Pet DRIVE FLEXUR LOW PRESSURE LINK B Na fal LINEARITY UL NS ADJUSTMENT c m6 v LQ Y 19 PIVOT ASSEMBLY MOUNTING TIEBAR SCREW ZERO ADJUSTMENT ZERO ADJUSTMENT LOCKING SCREW 36A9751 C FRONT VIEW SIDE VIEW B1668 1 Setting Switching Points Direct Acting Controllers The controller output signal will switch from zero pressure to full supply pressure when increasing process pressure passes the upper switching point 4194S Controllers Instruction Manual December 2011 D200158X012 The controller output signal will not return to zero pressure until decreasing process pressure passes the lower switching point When making adjustments as described in the following steps keep in mind that e Changing the set point adjustment will move both switching points equally in the direction of adjustment e Changing the proportional band adjustment will widen or narrow the differential gap between the two switching points by moving the position of the lower switching point Figure 3 3 shows the relationship between the percent of sensor range between switching points and the proportional band setting on the controller The following example illustrates how to use figure
65. oes not require an O ring 4 Install the replacement relay making sure the tabs on the relay see figure 4 4 line up with the tab on the frame 5 Tighten the two screws that hold the relay in place Figure 4 4 Relay Construction CLEAN OUT WIRE EXHAUST PORT NO O RING USED O RINGS RELAY 2 MOUNTING PSP SCREWS 25 4194S Controllers Instruction Manual December 2011 D200158X012 Case and Cover CAUTION The case and cover are an integral unit attempting to separate them will damage the hinge If the cover needs to be replaced replace the case also 1 Remove the supply and output piping from the controller Bleed away any process pressure and carefully remove the process pressure piping from the controller Remove the controller from its mounting see the Installation section to a maintenance area Remove the nine screws key 38 from the case key 1 and lift out the controller assembly Install the controller assembly in the replacement case Slide the controller frame down to assure an O ring seal at the pressure connections Hole the frame in place Install and tighten the nine mounting screws Remove the blow out plug key 72 from the original case and install in the replacement case Mount the controller as described in the Installation section DU BR Connect the supply output and process pressure piping to the controller Gauges CAUTION Bef
66. oint is to be set at 10 psi and the upper switching point is to be set at 25 psi Proceed as follows Divide the differential gap the difference between the upper and lower switching points by the sensing element range Multiply the result by 100 as shown in the following equation Differential Gap 15 psi x 100 Sensing Element Range 30 psi x 100 50 Locate the 50 percent line on figure 3 3 Move along this line until you intersect the curve Read the proportional band setting on the left hand axis For this example the setting is approximately 35 percent 1 Using the curve in figure 3 3 determine the correct proportional band setting for the desired gap expressed as a percent of the maximum input element span between the switching points 2 Set the proportional band knob to the desired setting determined in step 1 3 Adjust the set point to the desired lower switching point 4 Carefully adjust the process differential pressure to 100 percent of scale range Then decrease the process differential pressure until the controller output signal switches from zero pressure to full supply pressure 5 Increase the process differential pressure to the desired switching point at which the controller output signal switches from full supply pressure to zero pressure 6 Widen the proportional band slowly until the output signal switches from zero pressure to full supply pressure Repeat steps 4 through 6 until the control
67. on This section includes descriptions of adjustments and procedures for prostrate and startup procedures Location of adjustments are shown in figures 3 1 and 3 2 To better understand the adjustments and overall operation of the controller refer to the Principle of Operation section and the schematic diagrams figures 3 4 and 3 5 Adjustments Manual Set Point To adjust the set point open the controller cover and move the set point adjustment until the pointer indicates the desired value of pressure on the process pressure scale Move the adjustment to the right to increase the set point and to the left to decrease it Adjusting the set point does not affect the differential gap setting Remote Set Point Option M CAUTION Do not move the set point adjustment manually on controllers with remote set point Doing so could damage the controller If the controller is equipped with the remote set point option see figure 3 2 vary the remote set point pressure to change the set point Increase the pressure to increase the set point and decrease the pressure to decrease the set point Proportional Band Differential Gap The proportional band knob adjusts the width of the gap between switching points Rotate the proportional band knob until the desired setting is opposite the line on the proportional band indicator cover Changing Controller Action Controller action can be switched from direct to reverse or vice versa by simply looseni
68. ore performing this procedure be sure the replacement gauges are the correct range so that the gauges are not damaged by overpressure 1 Unscrew the output gauge key 46 or the supply gauge key 47 from the frame key 3 2 Before installing the replacement gauge coat the threads on the gauge with a suitable sealant 3 Screw the replacement gauge into the frame Pressure Control Block 1 Carefully remove the process pressure piping from the controller after bleeding away process pressure 2 Loosen the nut on that portion of the tubing that connects the pressure sensing element to the pressure control block key 57 3 Remove the two cap screws key 58 that hold the pressure control block to the frame key 3 and lift out the pressure control block Install the O ring key 7 on the replacement pressure control block Install the replacement pressure control block to the frame with two screws key 58 Tighten the nut that was loosened in step 2 Apply the process pressure equal to the maximum value on the process scale and check for leaks CON OU A Connect the process pressure piping to the controller 26 Instruction Manual 4194S Controllers D200158X012 December 2011 Supply Tubing and Positive Feedback Tubing Assemblies Note The following procedure requires that the controller be removed from the case Perform steps 1 through 3 of the replacing case and cover procedure Remove the nuts that hold the
69. ove the screw and washer keys 19 and 20 that hold the relay nozzle tubing assembly key 18 to the frame Remove the proportional band knob nozzle pivot and the set point beam assembly from controller Remove the relay nozzle tubing assembly key 18 from the set point beam assembly key 23 Remove the E ring key 27 from the nozzle assembly key 21 10 11 12 13 14 Remove the nozzle assembly key 21 from the bottom of the set point beam assembly key 23 Remove the retaining clip key 26 Remove the proportional band knob key 25 from the set point beam assembly key 23 Inspect the nozzle pivot O ring Inspect the nozzle assembly key 21 and replace if necessary Inspect the nozzle orifice and clean it if necessary 27 4194S Controllers Instruction Manual December 2011 D200158X012 15 16 17 20 21 22 23 24 25 26 27 28 29 30 31 22 33 34 Install the proportional band knob key 25 on the set point beam assembly key 23 Install the retaining clip key 26 on the three posts on the proportional band knob Install the nozzle assembly key 21 through the set point beam assembly key 23 the proportional band knob key 25 and the retaining clip key 26 into the cap aligning the nozzle with the tab on the proportional band knob shown in figure 4 5 While holding the nozzle tubing key 21 against the set point beam assembly key 23 depress the ret
70. pointer position at 50 percent of full pressure input span If the error is greater than 1 percent of input span perform the Linearity Adjustment procedures Linearity Adjustment Adjust the linearity by rotating the linearity adjustment screw in the curved slot on the lever arm of pivot B key 115 Adjusting the linearity affects the zero and span adjustment 1 Adjust the remote set point pressure to 50 percent of the input span The set point indicator should indicate the 50 percent mark on the scale 2 If the pointer indicates high loosen the linearity screw and rotate it counterclockwise in the slot If the pointer indicates low rotate the linearity screw clockwise in the slot 3 Check the zero and span as described in the Zero and Span Adjustment procedures Make any necessary adjustments 4 Repeat steps 1 through 3 until zero span and linearity indications are within 1 percent of input span Auto Manual Option E Refer to the Maintenance WARNING on page 21 Note Each of the following procedures requires that the controller be removed from the case Perform steps 1 through 3 of the replacing case and cover procedure 50 Instruction Manual 4194S Controllers D200158X012 December 2011 Replacing the Auto Manual Station Refer to figures 4 19 5 4 and 5 5 for key number locations Note This procedure also permits replacement of the switch manifold O rings key 312 the auto manual tubing assembly key 138
71. repeat steps 8 through 12 to straighten the bellows bracket key 31 Refer to the Flapper Alignment procedures Remove the supply pressure the output measurement device and the regulated differential process pressure source Rotate the proportional band knob to the desired controller action Replace the proportional band indication cover key 36 and tighten the two screws key 6 Install the controller assembly in the case Slide the controller frame down to assure an O ring seal at the pressure connections Hold the frame in place Install and tighten the nine screws that hold the controller assembly in the case Links This section describes the separate replacement of five links in the controller To clarify the location of each link see figure 4 12 the links are numbered as follows link number 1 connects short pivot assembly and the process pointer link number 2 connects the process pointer and the input feedback beam assembly key 11 link number 3 connects the set point adjustment and the set point beam assembly key 23 link number 4 key 65 connects the input feedback assembly and the bellows bracket key 31 Link number 5 key 88 figure 5 2 connects the short pivot assembly and the long pivot assembly Figure 4 12 shows the location of each link Link Number 1 1 2 Remove the two screws key 6 and lift off the proportional band indicator cover key 36 Note where the link is connected Disconnect the link
72. rforming the checks open loop conditions must exist Refer to figure 3 1 for location of adjustments Note If the controller has the auto manual option option E be sure the controller is in the automatic mode prior to performing prestartup checks Figure 3 1 Location of Controller Parts and Adjustments SET POINT INDICATOR HIGH PRESSURE CAPSULAR UNIT PROCESS GUIDE INDICATOR een PROPORTIONAL LOW PRESSURE BAND CAPSULAR UNIT INDICATOR a7 ht Coo COVER ae PROPORTIONAL Ree 2 BAND INDICATOR e wo INDICATING DRIVE LINKAGE TS ASSEMBLY LONG E LINK 1 CONNECTING PIVOT LINK 2 Sa POINTER ZERO LINKS SY ADJUSTMENT LINK 2 OUTPUT s PRESSURE GAUGE PIVOT d LINEARITY ADJUSTMENT 38A1731 B LOW SENSING ELEMENT PRESSURE PROCESS POINTER SPAN ADJUSTMENT 38A3819 A INPUT FRONT VIEW C0541 12 Instruction Manual 4194S Controllers D200158X012 December 2011 Figure 3 1 Location of Controller Parts and Adjustments continued SCREW 1 SCREW 2 SCREW 3 2 a L EE L l PROCESS SPAN ADJUSTMENT 35A7374 B REMOTE SET POINT SPAN ADJUSTMENT SIDE VIEW OF SET POINT PROCESS INDICATOR ASSEMBLY 49A0771 A SIDE VIEW OF CONTROLLER SHOWING FLAPPER LEVELING SCREWS C0541 1 Connect supply pressure to the supply pressure regulator and be sure i
73. rocedure Process Drive Flexure 1 Set the process differential pressure to 75 percent of input span 2 Remove tie bar key 97 by removing three screws key 103 form the capsular assembly 3 Remove the screws and washers keys 12 and 13 to disconnect the drive flexure key 79 from the drive bracket assembly key 84 and from the adjustment arm of the pivot assembly key 78 Remove the drive flexure 4 Connect the replacement drive flexure in place making sure it is straight and horizontal 5 Before tightening the screws key 12 set the pivot in the center of the bushing end play CAUTION Avoid bending or kinking the drive flexure Bending or kinking the drive flexure can result in product damage as well as impaired performance 6 Tighten the drive flexure to hold the pivot in position Take care not to kink or twist the flexure when tightening the screws 7 Refer to the Maintenance Calibration procedure Process Tubing 1 Remove the process pressure from the controller 2 Disconnect the pressure tubing keys 91 or 92 at the pedestal assembly key 81 and at the bottom of the controller case 3 Remove the tubing keys 91 or 92 from the pressure elements 4 Install the replacement tubing and tighten all connections Check for leaks 5 Refer to the Maintenance Calibration procedure Capsular Element Assembly Refer to figure 5 2 for key number location 1 Remove the process pressure from the contro
74. ror is eliminated 9 Turn the proportional band indicator knob to 400 percent in the desired controller action either DIRECT or REVERSE 10 Install the proportional band indicator cover key 36 and tighten the two screws key 6 Remote Set Point Zero and Span Adjustment Option M Note Any adjustment of the pointer span adjustment screw will require readjustment of the pointer zero adjustment screw Instruction Manual 4194S Controllers D200158X012 December 2011 Referto figures 3 1 and 3 2 for location of adjustments Remove the two screws key 6 and lift off the proportional band indicator cover key 36 Set the proportional band between DIRECT and REVERSE Adjust the set point pressure to the low limit of the input range Adjust the set point indicator to the lowest limit of the input scale by loosening the zero adjustment locking screw and turning the zero adjustment screw Adjust the set point pressure to the upper limit of the input span Note whether the pointer indication is above or below the upper limit of the process scale 7 Adjust the span screw as follows clockwise to increase span for a low indication counterclockwise to decrease span for a high indication Adjust the span screw to correct one half the error 8 Repeat steps 4 through 7 until the error is eliminated 9 Replace the proportional band indicator cover key 36 and tighten the two screws key 6 U A Figure 3 2 L
75. rtup startup and calibration procedures to return the controller to service Troubleshooting As an aid to troubleshooting table 4 1 lists some common operating faults their probable cause and suggests procedures for correcting the fault 22 Instruction Manual D200158X012 Table 4 1 Troubleshooting Chart 1 Output does not snap when process pointer and set point indicator are aligned 2 Controller output will not snap to full output pressure 3 Controller output will not snap to zero pressure Possible Cause 1 1 Flapper out of alignment 1 2 Process pointer not calibrated correctly 1 3 No supply pressure 1 4 Leak in nozzle or feedback tubing 1 5 Leak in relay O rings 2 1 Output pressure gauge not functioning 2 2 Supply pressure incorrect 2 3 Leak in positive feedback tubing 2 4 Leak in nozzle tubing assembly 2 5 Sensing element or linkage failure 2 6 Relay malfunction 2 7 Switching point has not been reached 2 8 Link 4 not adjusted correctly 3 1 Flapper out of alignment 3 2 Switching point has not been reached 3 3 Sensing element or linkage failure 3 4 Links 2 3 and 4 defective 3 5 Relay malfunction or clogged nozzle Changing Controller Action Thefollowing steps describe changing controller action from direct increasing process pressure produces increasing output pressure to reverse increasing process pressure produces decreasing output pressure or vice versa 1 1
76. screw Ensure the nozzle remains centered on the flapper with the set point beam assembly slid snugly towards the relay nozzle tubing assembly 33 4194S Controllers Instruction Manual December 2011 D200158X012 Figure 4 10 Link 2 Number Adjustment 3 32 33 34 35 36 37 38 39 40 41 42 43 W3476 W3451 Install the pivot of the set point pivot assembly key 17 in the hole in the set point beam Install washer key 20 on screw key 19 Install the set point beam bias spring key 28 into the frame key 3 bore and onto the spring seat on the set point beam assembly key 23 Attach link number 3 to the set point beam assembly Apply proper supply pressure to the controller and check for leaks Adjust the proportional band to 5 percent direct action and adjust the set point to the maximum value on the process scale Controller output should be 0 psig Remove supply pressure from the controller With zero pressure in both feedback bellows loosen the two adjusting screws on link 4 and connect the link to the bellows bracket assembly allowing the link to find its free length Tighten the two adjusting screws If the position of the set point beam shoe key 29 was changed during this procedure perform steps 32 through 52 in the Replacing Proportional Band Knob Nozzle Pivot and Set Point Beam Assembly procedure Otherwise perform step 40 Install the controller assembly in the case Sli
77. ss pointer and the pointer subassembly 6 Turn the span adjustment screw on the bottom of the process pointer counterclockwise as far as it will go so the span adjustment bracket will be in its highest position 7 Adjust the process differential pressure to 50 percent of full input span Adjust the length of link 5 key 88 so that the pivot level arms are as close to parallel as possible 8 To complete maintenance calibration the zero and span adjustments must be set Refer to the following section for that procedure If linearity adjustments must also be made refer to that portion of the procedures 9 Replace the tie bar key 97 after the controller is calibrated 10 Referto the Flapper Alignment procedures Process Zero and Span Adjustment 1 Remove the two machine screws key 6 and lift off the proportional band indicator cover key 36 2 Setthe proportional band between DIRECT and REVERSE 3 Apply 0 percent of the process differential pressure input span 4 Loosen the screw on link 5 key 88 and adjust the length so that the process pointer points to scale zero Tighten the screw 5 Make fine zero adjustments by loosening the zero adjustment locking screw on the process pointer and turning the zero adjustment screw Tighten the locking screw 6 Apply 100 percent of the process pressure input span 7 To increase the span proceed as follows 43 4194S Controllers Instruction Manual December 2011 D200158X012
78. sseribly aede m 52 Assembly c MER MES 52 Replacing the Loader Range Spring Diaphragm Assembly Ball Seat Tubing and Ball 53 Disassembly 53 ASS i a acne en SEES AE der 53 Replacing the Loader Valve Plug and Valve Plug Spring 54 5 Parts 55 ER 55 Pars DIS E ooa arts a st Rat m UAR ies lage ones 55 General Controller Parts 55 Mounting eisini ER 5 Pipestand Mounting 57 Panel 57 WallMOUNLING ss perpe te b hr Dag 57 Actuator Casing Mounting 5 Actuator Yoke Mounting 57 TUDING 57 5 This instruction manual provides installation operating calibration maintenance and parts ordering information for the 4194S differential pressure indicating controllers Portions of this manual apply only to specific configurations in the 4194S product line These configurations of the controller are indicated by letter suffixes in the type number that correspond to the mode and option designated in table 1 2 Refer to table 1 2 for available 4194S configurations The type number of the controller is on the nameplate Refer to figure 1 1 for the location of the nameplate Description The controllers described in this manual provide a differential gap output
79. supply gauge tubing assembly key 39 or the positive feedback tubing assembly key 45 to the frame Remove the tubing 2 Install the replacement tubing assemblies 3 Apply the correct supply pressure and check for leaks 4 Install the controller assembly in the case Slide the controller frame down to assure an O ring seal at the pressure connections Hold the frame in place Install and tighten the nine self tapping screws key 38 into the frame Mount the controller as described in the Installation procedure 7 Connect supply output and process pressure piping to controller Proportional Band Knob Nozzle Pivot and Set Point Beam Assembly Note The following procedure requires that the controller be removed from the case Perform steps 1 through 3 of the replacing case and cover procedure Remove the two screws key 6 and lift off the proportional band indicator cover key 36 figure 4 2 2 Disconnect link number 3 from the set point beam assembly key 23 Refer to figure 4 12 for location of the link 3 Remove the set point beam bias spring key 28 Refer to figure 4 5 for spring location 4 Remove the screw and washer keys 19 and 20 that hold the pivot assembly key 17 to the frame and remove the pivot assembly Refer to figure 4 15 Disconnect the nut that holds the relay nozzle tubing key 18 into to the frame key 3 Refer to figure 5 1 While holding the proportional band knob rem
80. t is delivering the proper supply pressure to the controller Provide a means of measuring the controller output pressure 2 For controllers with remote set point option M connect regulated pressure of 0 2 to 1 0 bar 3 to 15 psig or 0 4 to 2 1 bar 6 to 30 psig to the remote set point connection at the top of the controller case 3 Loosen two screws key 6 lift off the proportional band cover key 36 and set the proportional band knob between DIRECT and REVERSE The process indicator should indicate the process differential pressure For example with the process differential pressure at 50 percent of the input span the process pointer should be at 50 1 0 percent of its span Slight adjustment of the indicator zero screw may be necessary See figure 3 1 for zero adjustment and locking screw location 4 f desired the accuracy can be verified at other points on the scale If the indicator appears to be out of calibration refer to the process zero and span adjustment portion of the calibration procedure Startup It is recommended that the controller switching points be set as described in the calibration procedures Slowly open the upstream and downstream manual control valves in the pipeline and close the manual bypass valve if they are used 4194S Controllers Instruction Manual December 2011 D200158X012 Calibration A WARNING To avoid personal injury or property damage resulting from the sudden release of pressur
81. tach the new pivot assembly to the mounting plate with the two mounting screws 8 Loosely connect the drive flexure to the arm on the new pivot assembly 9 Apply 75 percent of the input differential pressure range to the capsule The flexure should be straight and horizontal Before tightening the screws set the pivot in the middle of the bushing end play Tighten the flexure to hold the pivot in that position Adjust the length of the adjustable pivot arm as needed until the flexure is straight Take care not to kink or twist the flexure when tightening the screws 10 Connect the left hand end of link 5 key 88 to the pivot lever arm in the position noted in step 3 11 Replace the tie bar key 97 12 Refer to the Maintenance Calibration procedure Short Pivot Assembly 1 Remove the process pressure from the controller 40 Instruction Manual 4194S Controllers D200158X012 December 2011 2 Disconnect links 1 and 5 keys 88 and 90 from the pivot assembly key 89 Note which holes they connect to Remove the two screws key 102 attaching the pivot assembly to the mounting plate key 77 and remove the pivot assembly Setthe linearity adjustment screw to approximately the same location as the old assembly Insert the replacement pivot assembly on the mounting plate and attach it with the two mounting screws Attach links 1 and 5 keys 88 and 90 in the same position as noted in step 2 Referto the Maintenance Calibration p
82. the Loader Valve Plug and Valve Plug Spring Refer to figure 5 5 for key number location Perform steps 1 through 3 of the replacing case and cover procedure Loosen the spring seat screw key 275 Remove the valve plug spring key 276 and the valve plug key 277 Inspect the parts and replace as necessary 1 2 3 4 5 Install the valve plug spring and valve plug 6 Tighten the spring seat screw 7 Temporarily apply supply pressure and process pressure and check for leaks 8 Install the controller assembly in the case Slide the controller frame down to assure on O ring seal at the pressure connections Hold the frame in place 9 Install and tighten the nine screws that hold the controller assembly in the case 54 Instruction Manual 4194S Controllers D200158X012 December 2011 Section 5 Parts Ordering Whenever corresponding with your Emerson Process Management sales office about this equipment always mention the controller serial number When ordering replacement parts refer to the 11 character part number of each required part as found in the following parts list A WARNING Use only genuine Fisher replacement parts Components that are not supplied by Emerson Process Management should not under any circumstances be used in any Fisher instrument Use of components not supplied by Emerson Process Management may void your warranty might adversely affect the performance of the instrument and could result in
83. the end of the capsule stack Tighten the travel stop mounting screws to lock it into that position 3 Zero stop Adjust pressure input to 0 percent of the full span Slide the travel stop nut key 86 along the diaphragm capsule extension key 82 until it is approximately 0 4 mm 1 64 inch away from the travel stop Tighten the set screw to lock the travel stop nut in that position Aligning the Linkage 1 Adjust the process differential pressure to 75 percent of the input span The drive flexure key 79 should be straight and horizontal If it is not proceed as follows a Loosen the screw on the adjustment arm on the long pivot assembly key 78 and the two screws mounting the drive flexure b Adjust the length of the adjustment arm so that the drive flexure is parallel to the centerline of the capsules c Tighten the screw to set the length of the adjustment arm in that position Before retightening the screws set the pivot in the middle of the bushing end play d Tighten the drive flexure to hold the pivot in that position 2 Tighten the guide flexure to the mounting plate 3 Set the linearity adjustment screw on the short pivot assembly in the middle of its slot 4 Make certain that the process pointer and pointer subassembly are aligned see figure 4 13 Change the length of link 1 key 90 to the middle of its adjustment 5 The short bottom arm on the short pivot assembly key 89 should be parallel with the proce
84. the maximum allowable pressures in tables 1 3 and 1 4 Refer to figure 2 5 Supply output and vent connections are 1 4 NPT Process pressure connections are 1 4 or 1 2 NPT optional Figure 2 5 Location of Connections REMOTE SET POINT CONNECTION SUPPLY PRESSURE LOW PRESSURE A CONTROLLER OUTPUT PRESSURE HIGH PRESSURE B 46A9765 A A3001 BOTTOM VIEW Process Pressure Process pressure is piped to the connection marked A and B on the bottom of the case see figure 2 5 The high pressure line is piped to connection B and the low pressure line connects to A When installing process piping follow accepted practices to ensure accurate transmission of the process pressure to the controller Install shutoff valves vents drains or seal systems as needed in the process pressure lines If the instrumentis located such that the adjacent process pressure line will be approximately horizontal the line should slope downward to the instrument for liquid filled lines and upward toward the instrument for gas filled lines This will minimize the possibility of air becoming trapped in the sensor with liquid filled lines or of condensate becoming trapped with gas filled lines The recommended slope is 80 millimeters per meter 1 inch per foot 4194S Controllers Instruction Manual December 2011 D200158X012 Supply Pressure Severe personal injury or property damage may occur if the instrument air supply is not clean dry and oil free
85. the process scale range Then to step 53 For reverse acting controllers adjust the proportional band knob to 5 percent reverse acting Adjust the set point manually or with remote set point pressure to 5 percent of the process scale range Carefully adjust the process differential pressure to 100 percent of the process scale range Then slowly decrease the process differential pressure until the output pressure snaps to supply pressure The output should snap to supply pressure within 2 percent of set point If the output pressure snaps to supply pressure below 2 percent of set point adjust flapper leveling screw number 1 counterclockwise see figure 3 1 for location of screw If the output pressure snaps to supply pressure above 2 percent of set point adjust flapper leveling screw number 1 clockwise Repeat steps 44 through 46 until the output pressure snaps to supply pressure within 2 percent of set point If the tolerance cannot be obtained with the flapper leveling screw go to step 51 Adjust the set point manually or with remote set point pressure to 95 percent to the process scale range WARNING In step 49 do not exceed the operating limits of the controller refer to table 1 3 Personal injury or equipment damage may result from overpressure 49 50 51 52 93 54 55 56 Increase the process differential pressure until the output pressure snaps to zero Then slowly decrease the process dif
86. trollers D200158X012 December 2011 6 Narrow the proportional band slowly until the output signal switches from zero pressure to full supply pressure Repeat steps 4 through 6 until the controller output switches at the desired points 8 Observe the process pointer when the output switches at the upper switching point The process pointer indication should be within 2 percent of the set point indication If the output does not snap within 2 percent of set point refer to the calibration procedures Reverse Acting Controllers The controller output signal will switch from zero pressure to full supply pressure when decreasing process pressure passes the lower switching point The controller output signal will not return to zero pressure until increasing process pressure passes the upper switching point When making adjustments as described in the following steps keep in mind that Changing the set point adjustment will move both switching points equally in the direction of adjustment Changing the proportional band adjustment will widen or narrow the differential gap between the two switching points by moving the position of the upper switching point Figure 3 3 shows the relationship between the percent of sensor range between switching points and the proportional band setting on the controller The following example illustrates how to use figure 3 3 Example The sensing element has a range of 30 psi The lower switching p
87. ure set pivot A in the middle of the bushing end play Tighten down the drive flexure to hold the pivot in that position Do not kink or twist the flexure when tightening the screws 4 Decrease the remote set point pressure to 0 psig 5 Perform the Maintenance Calibration procedure Tubing 1 Decrease the remote set point pressure to 0 psig 2 Disconnect the pressure connection key 93 into the pedestal assembly key 105 and the connection to the case exterior at the top of the case 3 Remove the tubing 4 Install the replacement tubing and reconnect the two pressure connections 5 Apply full remote set point pressure and check for leaks Remote Set Point Capsular Element Assembly Note Remove the supply pressure gauge before attempting to remove the capsular element assembly 1 Decrease the remote set point pressure to 0 psig 2 Remove the pressure connection key 93 at the pedestal assembly key 105 3 Disconnect link B key 126 from the pivot hole on set point indicator assembly 4 Remove the three mounting screws that attach the capsular element assembly to the process set point indicator assembly See figure 3 2 for location of screws CAUTION In the following step do not lift out the capsular element assembly by holding the capsule or the linkages These parts are easily damaged 47 4194S Controllers Instruction Manual December 2011 D200158X012 5 Lift out the capsular element assembly by holding th
88. with the options as shown in table 1 2 The controller shows process differential pressure and set point on an easy to read process scale The controller output is a pneumatic signal that operates a final control element Do not install operate or maintain 41945 differential pressure indicating controller without first being fully trained and qualified in valve actuator and accessory installation operation and maintenance To avoid personal injury or property damage it is important to carefully read understand and follow all of the contents of this manual including all safety cautions and warnings If you have any questions about these instructions contact your Emerson Process Management sales office before proceeding Instruction Manual D200158X012 4194S Controllers December 2011 Table 1 1 Specifications Available Configurations See table 1 2 Sensing Element Range Input Signal Lower and Upper Range Limits As shown in table 1 3 Maximum Allowable Pressure As shown in table 1 3 Process Scale Matched to the range of the process differential pressure as standard Optional scales available Process Connections Standard 1 4 NPT internal stainless steel all input ranges Optional 1 2 NPT internal stainless steel Output Signal Differential Gap Range 0 and 1 4 bar 0 and 20 psig or 0 and 2 4 bar 0 and 35 psig Action Field reversible between direct increasing differential pressure increases output

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