Specifications - Installation and Operating Instructions
Contents
1. B 6 32 x 3 16 4 FOR PANEL MOUNTI Patent No 4 890 497 The Dwyer Series 605 Magnehelic Indicating Transmitter simulta neously provides local indication on a large easily read ana log scale while also converting that pressure into a standard two wire 4 20 mA signal for ranges from 0 0 5 to 0 50 w c Positive negative or differential air and compatible gas pressure can be measured with an accuracy of 2 of full scale The basic mechanical components of the Series 605 Magnehelic indicating transmitter are similar to those used in the popular time proven Magnehelic differential pres sure gage However the Series 605 models add electrical conditioning and amplification of a resistance change pro duced by a silicon strain gage which is cemented to the range spring This resistance change is the result of the slight flexing which results from spring deflection as pres sure is applied to the diaphragm which is directly linked to the spring STANDARD ACCESSORIES Mounting ring Snap ring 4 6 32 x 1 1 4 screws panel mtg 3 6 32 x 5 16 screws Surface mtg 2 Tubing to 1 8 NPT adapters 2 1 8 NPT plugs Adjustment key Model Range Maximum Electrical Number in w c Pressure oe Yo 0 2 25 psi 1 7 bar 25 psi 1 7 bar 25 psi 1 7 bar 25 psi 1 7 bar Spsi 34 5 kPa Apsi 34 5 kPa Apsi 4 5 kPa 5 psi 34 5 kPa Mechanical Accuracy PAMPPDPN NUUS2. Specifications Installation and Operating Instructions HOLES EQUALLY SPAM ONA A 4 1 8 104 78 e C 17 46 14 76 Model Range Maximum i Number in w c Pressure Accuracy Range in Pa name je in Pa 605 1 25Pa 605 250Pa 605 500Pa Bulletin E 68 Series 605 Magnehelic Differential Pressure Indicating Transmitter 4 6 32 HOLES EQUALLY SPACED ON 23 32 1 8 FEMALE 2 1 16 2 5 1 8 130 18 B C 18 26 NPT HIGH ea 190 18 B C PRESSURE CONNECTION Gad 1 8 FEMALE p LOW PRESSURE 2 1 2 CONNECTION 63 50 O D MOUNTING RING SPECIFICATIONS GAGE SPECIFICATIONS Service Air and non combustible compatible gases Wetted Materials Consult factory Accuracy See char Stability 1 F S yr Pressure Limits See chart Temperature Limits 20 to 120 F 6 67 to 48 9 C Process Connections 1 8 female NPT Size 4 101 6 mm dial face 5 127 mm O D x 2 11 16 68 3 mm Weight 1 Ib 12 6 oz 811 g Agency Approvals CE TRANSMITTER SPECIFICATIONS Accuracy See chart includes linearity hysteresis repeatability Temperature Limits 20 to 120 F 6 67 to 48 9 C Compensated Temperature Range 32 to 120 F 0 to 48 9 C Thermal Effect 0 025 F S F 0 045 F S C Power Requirements 10 35 VDC 2 wire Output Signal 4 to 20 mA Zero and Span Adjustments Protected potentiometers Loop Resistance DC 0 1250 ohms maximum Current Consumption DC 38 mA
3. periodic check of system calibration is recommended The Series 605 Differential Pressure Transmitter is is not field repairable and should be returned freight prepaid to the factory if repair is needed field repair should not be attempted and may void warranty Be sure to include a brief description of the prob lem plus any relevant application notes Contact customer service to receive a return goods authorization RGA num ber before shipping FR 01 440559 00 Rev 3
4. Note also that the receiver may be connected in either the negative or positive side of the loop whichever is most convenient Should polarity of the transmitter or receiver be inadvertently reversed the loop will not function properly but no damage will be done to the transmitter NOTE RECEIVER MAY BE IN SERIES WITH OR LEG OF CONTROL LOOP POWER SUPPLY 10 0 35 VOC SERIES 605 PRESSURE TRANSMITTER p SEE FIG C Figure B The maximum length of connecting wire between the trans mitter and the receiver is a function of wire size and receiv er resistance That portion of the total current loop resis tance represented by the resistance of the connecting wires themselves should not exceed 10 of the receiver resis tance For extremely long runs over 1 000 feet it is desir able to select receivers with higher resistances in order to keep the size and cost of the connecting leads as low as possible In installations where the connecting run is no more than 100 feet connecting lead wire as small as No 22 Ga can be used The Series 605 transmitters can be used with receivers requiring 1 5 volt input rather than 4 20 mA If the receiver requires a 1 5 volt input insert a 250 ohm 1 2 watt resistor in series with the current loop but in parallel with the receiv er input Referring to Figure B R becomes the 250 ohm resistor and point X and Y are connected to the receiver input point X being positive and po
5. done with unit vertical 3 Apply electrical power to the system and check for proper operation by slowly increasing pressure and observing whether the loop current increases above the 4 mA zero pressure reading 4 A spanner type key is supplied to adjust span and zero This helps to reduce unauthorized tampering Apply pressure until pointer aligns with full scale reading and adjust the SPAN knob for a 20 mA reading 5 Relieve all pressure allow a few seconds for setting and adjust the ZERO knob for a 4 mA current loop reading 6 The SPAN and ZERO controls are slightly interactive so steps 4 amp 5 should be repeated a few times until read ings of 4 and 20 mA are obtained consistently 7 Remove the milliammeter from the current loop and proceed with final installation of the transmitter and receiver MULTIPLE UNITS WITH COMMON POWER SUPPLY Y Several Series 605 transmitters can be operated with a sin gle power supply as depicted above in Figure D Be care ful to specify a supply with sufficient capacity The minimum current requirement at a given voltage can be calculated by multiplying the number of units x 20 mA In the example shown this would be 4 x 20 or 80 mA minimum Copyright 2007 Dwyer Instruments Inc Printed in U S A 8 07 MAINTENANCE Upon final installation of the Series 605 Transmitter and the companion receiver including the A 701 Digital Readout no routine maintenance is required A
6. int Y negative or ground The resistor should be connected at the panel end of the transmitter current loop close to the receiver input to take advantage of the immunity of the current loop to elec trical noise pickup Most electronic component distributors stock a 249 r 1 2 watt 1 tolerance metal film resistor which is adequate for this application MAXIMUM VALUE 1250 RL MAX Vrs 10 0V 20 mA DC OPERATING REGION RECEIVER RESISTANCE Ri 0 5 10 15 20 25 30 35 40 POWER SUPPLY VOLTAGE VDC Figure C OUTPUT RANGING Each Series 605 Magnehelic indicating transmitter is fac tory calibrated to produce 4 mA at zero scale reading and 20 mA at full scale reading The following procedure should be used if the pressure versus output signal relationship needs to be checked 1 With unit connected to the companion receiver per pre ceding instructions insert an accurate milliammeter with a full scale reading of approximately 30 mA in series with the current loop 2 Vent both pressure ports to atmosphere and if neces sary adjust pointer zero screw to align pointer with zero on scale A controllable pressure source capable of reaching the full scale range should be connected to either high pressure port Plug the other high pressure port and vent one or both low pressure ports to atmos phere The instrument must be ranged in the same position in which it will be used Standard factory cali bration and ranging is
7. maximum Electrical Connections Screw terminal block Mounting Orientation Diaphragm in vertical position Consult factory for other position orientations Mechanical na o Electrical 0 20 0 20 psi 1 4 bar 4 a 20 psi 1 4 bar Losi tS ban psi 1 4 bar i mel 1 0 125 25 psi 1 7 bar 0 250 25 psi 1 7 bar 0 500 2 psi 34 5 kPa INSTALLATION 1 HOLE IN PANEL FOR TERMINAL BLOCK LOCATION Select a location where the temperature of the unit will be between 20 F and 120 F Distance from the receiver is limited only by total loop resistance See Electrical Connections The tubing feeding pressure to the instrument can be run practically any length required but long lengths will increase response time slightly Avoid surfaces with excessive vibration POSITION All standard models are calibrated with the diaphragm vertical and should be used in that position for maximum accuracy If your application requires mounting in other than a vertical position be sure to specify this when ordering PRESSURE CONNECTIONS For convenience two sets of 1 8 female NPT ports are available Plug the unused set with pipe plugs provided Attach tubing from positive pressure source to port marked HI or from negative Vacuum source to port marked LOW In either case opposite port must be vented to atmos phere In dusty environments we recommend use of an A 331 Filter Vent Plug
8. to keep interior of instrument clean For differential pressures the higher source is connected to the HI port and lower to the LOW port 1 2 DIA HOLE IN PANEL FOR HIGH PRESSURE BACK CONNECTION WHEN SURFACE MOUNTED 3 3 16 DIA HOLES EQUALLY SPACED ON A 4 1 8 DIA BOLT CIRCLE FOR SURFACE MOUNTING 1 2 DIA HOLE IN PANEL FOR LOW PRESSURE CONNECTION WHEN SURFACE MOUNTED 4 MOUNTING The Series 605 Transmitter may be either panel mounted or surface mounted SNAP RING GROOVE PNEUMATIC PRESSURE TAPS 4 3 4 DIA HOLE A PANEL MOUNTING Cut a 4 3 4 or 120 mm dia hole in panel and insert the complete unit from the front Slip on the mounting ring and install the split snap ring in the groove on the bezel Seat the mount ing ring against the snap ring and thread the four screws through the tapped holes Tighten screws against rear of panel 1 1 8 LONG X 7 8 WIDE FOR TERMIINAL STRIP 1 2 DIA HOLES FOR PRESSURE CONNECTIONS AND OR MOUNTING 3 16 DIA HOLES FOR MOUNTING SCREWS TYP 3 PLACES B SURFACE MOUNTING Drill 3 3 16 dia holes for mounting screws and cut 1 7 8 x 1 1 8 hole for access to terminal strip as shown in hole location drawing Insert screws from rear of panel and thread into tapped holes on back of transmitter case If rear pressure connections are to be used make 1 2 dia holes located as shown in hole location drawing in left column ZEROING Once gage
9. transmitter is mounted in its final position check to be sure pointer aligns with zero on scale when no pressure is applied and both low and high pressure ports are vented to atmosphere To adjust turn small slotted screw at center bottom of gage face Do not move the larger black knobs labeled SPAN and ZERO These are for use only if a calibration check shows the 4 20 mA output signal to need adjust ment See page 3 under heading OUTPUT RANGING ELECTRICAL CONNECTIONS CAUTION DO NOT EXCEED SPECIFIED SUPPLY VOLT AGE RATINGS PERMANENT DAMAGE NOT COVERED BY WARRANTY WILL RESULT THIS UNIT IS NOT DESIGNED FOR AC VOLTAGE OPERATION Electrical connections to the Series 605 Transmitter are made to the two screw terminal strip on the rear of the case Polarity is indicated by and signs stamped on side The schematic diagram of the Series 605 transmitter is illustrated in Figure B ole Figure A An external power supply delivering 10 0 to 35 VDC with a minimum current capability of 40 milliamps must be used to power the control loop in which the Series 605 transmitter is connected Refer to Fig B for connection of the power supply transmitter and receiver The range of appropriate receiver load resistances R for the power supply voltage available is given by the formula and graph in Fig C Shielded two wire cable is recommended for control loop wiring and the negative side of the loop may be grounded if desired
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