MERCOID DIVISION - Dwyer Instruments, Inc.
Contents
1. 1 4 HP at 120V AC 1 2 HP at 240V AC DC rated controls up to 10A consult factory 5A 30V DC resistive 20 F 12 C See Code G Repeatability 1 of full scale DC Resistive Horsepower Circuit Suffix No 804 Switch Action SPDT one circuit OPENS as other CLOSES Two SPDT operate simultaneously in one direction upon increase or decrease when specified GENERAL BULB INFORMATION All bulbs are made of 304 stainless steel capillary material is either copper or 316 stainless steel as shown in the range table The maximum pressure of bulbs with a process connection is 300 psi Other bulbs are for non pressurized e g open tank use only Consult the factory for higher pressure applications RANGE TABLE NO 2 BULB Standard 11 160 Diameter Series D Bulb amp 3 4 NPT Connection R N Bulb 1 ange Numbers 6 ft Cap Tubing See Note for E amp B Dims Standard 3 4 NPT Process Connection rm STANDARD 3 4 NPT SS Bulb H PROCESS CONNECTION Copper Capillary SS Bulb SS Cap N 11N E 4 7 8 B 4 7 8 Standard Standard RANGE TABLE NO 2 BULB Optional 1 2 amp 3 8 Diameter Bulbs with 3 4 NPT Connection Bulb 1 Range Numbers 6 ft Cap Tubing SS Bulb E 5 3 4 N A N A Copper B 5 3 4 SS Bulb E 5 3 4 E 5 3 4 SS Cap B 5 3 4 B 5 3 4 B 10 SS Bulb Optional 1 2 Diameter Bulb with 3 4 NPT Process Connection Optional 3 8 Diameter Bulb with 3 4 NPT P2. Mercoid Installation Instructions Preliminary Series D 7000 N Remote Bulb Temperature Controls Bulletin IN 526 N ENCLOSURES TYPE NO PREFIX z s h _ _ i GENERAL PURPOSE WEATHER RESISTANT Prefixed by Prefixed by DA DL DR DS DAW DLW DRW DSW CONTROL NUMBERS Part of the control number following Type No Prefix identifies the style of the control case The digit 5 of 7035 denotes a plain case with bottom connection The digit 8 of 7038 denotes a flanged case with bottom connection The digit 9 of 7039 denotes a flanged case with back connection CIRCUITS SWITCH OPERATION Suffix number after control number denotes number of circuits and circuit operation Suffix 153 designates SPDT one circuit closes as other circuit opens Suffix 804 designates 2 ea SPDT switches two circuits close as two cir cuits open LOCATION AND MOUNTING OF CONTROL CASE Follow equipment manufacturer s instructions or proceed as follows Vibration causes erratic operation of any instrument and shortens its life It is important to select a location that is reasonably free of vibration All controls must be mounted vertical and level Delrin bushed movements prolong con trol life by alleviating excessive wear of metal surfaces due to vibration and or pulsation It is identified by the letter B after the suffix number Example 2B 3B 804B etc General Purpose Types DA DS DL DR These contro
3. OTES Dim E MINIMUM INSERTION DEPTH Minimum clearance distance for bulb insertion measured from the top outside Surface of female NPT Dim B ACTIVE BULB LENGTH Length of bulb that responds to temperature change measured from the free end Process fluid must have good contact with the bulb over this length CAUTIONS Control movement must not be oiled Do not overload note electrical rating on nameplate and be sure total current passing through switch is within specified rating WARNING A failure resulting in injury or damage may be caused by over pres sures excessive vibration or pressure pulsation excessive temperature corro sion of pressure containing parts and movement assembly electrical overload or other misuse Do not tamper with switch wires Position of these wires is essential to proper operation Tampering with these wires will void warranty LOCKING DEVICE n When the control has been adjusted to desired range the locking bar may Tres DAL od DSH DLH be inserted between the adjustment screws with slot passing over the pro jecting lug By placing a sealing wire between the locking bar and the hole Drawing No 1350 in the lug protruding from adjustment assembly adjustments cannot be 7 177 8 tampered with BREATHER SE 5 1270 For DAH and DSH sealing wire may pass through locking bar and hole in l EREN ee hub above adjusting knobs OPTIONAL DA
4. W DRW DSW adjusting knob cover may be sealed in place with seal a re es ing wire through cover bolt hole EWA as a Net iF I Tite yw dy E CONTROL DIMENSIONS 9 716 AMA a i IR a4 CONDUIT I few Note Dimensional drawings shown are for general reference only 239 7 ANO A gt CONNECTION E Comprehensive drawings are available from factory upon request Swot Tie ml A 1 General Purpose ae Se iar Types DA DS DR DL 7 3 4 196 9 ia a Drawing No 1000B Explosion Proof Types DAE DRE DSE DLE Drawing No 98D 4 87 16 11 23 MOUNTING HOLES A x 1472 06 1 64 A 38 10 152 8 CONNECTION 1 2 CONDUIT f BOTTOM BACK HOLE CONNECTION CONNECTION Flange for Surface Mounting 1 Drawing No 1000F 7 5 8 193 7 1043 16 274 7 OEE UNTING HOL Weather Proof EQUALLY SPACED Types DAW DSW DRW DLW ON A 6 1 2 1651 B C i Drawing No 1062 j 3 REAR FLANGE MOUNTING HOLES ts m lt f me il a7 S IS 01778 LS N 7 a SS Ea s ADJUST CONNECTION CONNECTION Nid i le EA LO npr COVER L 9 aa _conouT HUB 71 44 Copyright 1997 Dwyer Instruments Inc Printed in U S A 2 97 FR 92 442122 00 MERCOID DIVISION Phone 219 879 8000 www dwyer inst com DWYER INSTRUMENTS INC Fax 219 872 9057 e mail info dwyer inst com P O BOX 258 MICHIGAN CITY INDIANA 46361 U S A
5. apacities 5A 120 V 5A 240 V Not available for 440 V DC capacity 5A 30 V resistive OPERATING RANGES SERIES D 7000 With Snap Action Contacts Types DA 7035 DA 7235 153 amp DA 7235 804 Adjustable Deadband Adjustable Deadband DS 7035 153 DS 7235 153 Bulb Furnished With 6 Capillary Unless Otherwise Specified 1 Fixed Deadband DS 7235 804 2 SPD Bulb Min Insertion Depth 2 Max Process Temp Not To Minimum 0 Exceed Deadband 150 F 65 C 5 F 3 C 5 F 3 4N 250 F 120 C 25 F 14 C 5 F 3 F 3 C C C C Adjustable Operating Fixed Range Fixed Deadband No 2 SS Copper 2 7 8 73 mm Bulb No Cap Mat l g 60 to 30 F 50 to 0 C O to 100 F 18 to 40 C 50 to 150 F 10 to 65 C 100 to 200 F 40 to 95 C 140 to 300 F 60 to 150 C 250 to 415 F 120 to 215 C 350 to 550 F 175 to 290 C 100 to 300 F 40 to 150 C g o C 8 F 4 5 C 9 F 5 C 10 F 6 C C F 8N 550 F 290 C 42 F 23 C ON 600 F 315 C 50 F 28 C 100 to 500 F 40 to 260 C 11N 100 F 56 C ELECTRICAL RATINGS See Code D 1 All bulbs including those with a copper capillary are made or Type 304 Stainless Steel 2 Insertion depth may be increased through use of bulb supports or wells 10 F 6 10 F 6 C No 2 SS Copper 2 7 8 73 mm 20 F 12 C No 2 SS SS 2 7 8 73 mm See Code as AC Capacity 120V D 15A 15 480V 1 2A E 15A G 804 5A NA
6. as no flow so its temper ature is affected by radiation to or from et B the surrounding air These two illustrations indicate the bulb is completely exposed in direct path of medium being controlled ILLUSTRATION ILLUSTRATION NO 8 NO 9 Phone 219 879 8000 www dwyer inst com DWYER INSTRUMENTS INC Fax 219 872 9057 e mail info dwyer inst com P O BOX 258 MICHIGAN CITY INDIANA 46361 U S A WELLS Wells with dimensions A and C in illus tration 10 are used to protect the remote bulb from physical damage or to permit removal of the bulb without draining the system The use of a well will increase the time lag of the control since the temperature change of the controlled medium must be transmitted through the wall of the well and then the bulb Thus when wells are used it is important that the well dimen sion C be greater than or equal to the bulb length B to insure that all of the temperature sensistive portion of the bulb is within the liquid area ILLUSTRATION NO 10 WIRING Wire in accordance with local electrical codes or follow equipment manu facturer s recommendations On general purpose controls do not attach ridged conduit to case use a short strip of BX to relieve conduit expansion and contraction strains Where a control is connected directly into the load circuit it must be con nected into the hot side of line Do not overload electrically see nameplate attac
7. hed to control for electri cal rating ADJUSTMENTS How to Set Operating Point of Control DA DOUBLE ADJUSTMENT TYPES FULLY AUTOMATIC Prefixed by DA DAE DAH DAW Sy UPPER Provided with double adjustments Adjust POINTER the upper pointer to set the high tem Pm perature point for switch operation Adjust e o the lower pointer to set the low temper J gt an between the upper and lower pointers is F i BO the operating differential between on off l switch operation Minimum differential for LOWER each range is shown on Page 3 POINTER ature operating point The difference DE SINGLE ADJUSTMENT TYPES FULLY AUTOMATIC Prefixed by DS DSE DSH DSW Equipped with a single adjustment The single pointer on the scale sets the tem perature where switch operation occurs Differential is fixed not adjustable For fixed differential of each respective range see Page 3 SINGLE ADJUSTMENT SEMI AUTOMATIC CONTROL WITH MANUAL RESET t DR 7035 153U A single adjustment sets the operating point for automatic opera tion A push button reset must be operat ed manually to restore the circuit to the original position after automatic operation Example Type DR 7035 1538L circuit will RESET open automatically on a temperature rise ADJUSTMENT to the temperature indicated by the pointer on the scale no matter how much the temperature drops the circuit will not reclose until the
8. hould be located lon gitudinaly in the pipe so that the entire length is exposed to the flowing medi um ex replace an elbow in the pipe with a tee and install bulb as shown in illustration No 6 and 7 If pipe is 1 diameter or less provide an enlarged sec tion around the bulb so that it does not restrict flow d When bulb No 2 is to be inserted in a rapidly flowing stream of fluid in a pipe or duct make sure that it is mechanicaly protected against the velocity in order to prevent the bulb from breaking off at the capillary 5 Gas activated bulbs unlike vapor pressure bulbs do not have any eleva tion effects Therefore no compensation is required MERCOID DIVISION EXPLOSION PROOF Prefixed by DAE DLE DRE DSE EXPLOSION PROOF Prefixed by DAH DLH DRH DSH BULB PROTECTION There are three ways to protect bulb No 2 1 Before tightening packing gland pull bulb back into union as far as possi ble standard No 2 bulb with 3 4 union only The union is recessed to pro vide some support 2 Where insertion depth is greater than bulb length use extension sleeve B See illustration Nos 8 9 and 10 3 Separable Wells see drawing No 10 wells slow down heat transfer of temperature changes to the bulb and consequently increase response time of control the union will slide back on capillary allowing complete immersion of bulb in any depth of well FOR DIMENSIONS OF BULBS SEE CHART PAGE 3 Caution Whe
9. ls without a flange plate are mounted by means of a bracket supplied with the control For panel mounted use the holes provided on the flanged case See drawing 1000F on page 4 Weather Resistant Types DAW DSW DRW DLW For surface mount ing only Has flanged case with bottom connection See drawing 1062 on page 4 Explosion Proof Types DAE DSE DLE DRE DLH DAH DSH DRH Secure with the mounting lugs provided on the housing See drawings 98D and 1350 on page 4 LOCATION OF REMOTE BULB To Insure Proper Control Operation 1 The temperature bulb should be completely immersed in the medium being controlled 2 BULB MUST BE CORRECTLY LOCATED AND PROPERLY INSTALLED so that the temperature changes at the bulb reflect actual temperature changes of the medium being controlled 3 Be sure the bulb will not be affected by external temperatures 4 Bulb may be installed vertically or horizontally The following precautions should be taken a Do not install bulb in dead end of pipe tank etc where it would not be subject to free circulation of the medium being controlled See illustration No 5 b If bulb No 2 is located in a pipe or duct with diameter larger than the bulb length the bulb can be installed perpendicular to the pipe if protected from possible damage due to flow velocity c If bulb No 2 is to be inserted into a pipe with a diameter smaller than the bulb length ex a 2 7 8 long bulb in a 1 pipe the bulb s
10. n installing bulbs with union connections be careful not to twist the flexible tubing Loosen packing nut or union so that the union can turn freely around tubing After union is firmly secured to the pipe or tank position bulb by sliding tubing through union and then tighten the packing gland nut CROSS AMBIENT TEMPERATURE EFFECTS There are no cross ambient effects associated with these gas actuated units which are designed with a range number ending with n i e 5N WHERE TURBULENT OR FAST FLOWING LIQUIDS PREVAIL Bulb supports for bulb No 2 are used where the bulb is mounted in turbulent or fast flowing liquids or where it is desired to insert the remote bulb at some distance within a vessel pipe or tank See B in illustration Nos 8 9 and 10 The remote bulb should be positioned so that at least one inch of the bulb is within the extension sleeve B dimension B in order to insure firm Support No 2 bulb union is threaded to receive extension sleeve B Extension addi tion A permits extending the mounting through insulation IL II baal 3 4 NPT L mih NT jam al II El i m JAP gt SUPPORT SLEEVE OR TAn T SEPARABLE WELL lt A i J mm RIGHT i WRONG ILLUSTRATION ILLUSTRATION ILLUSTRATION NO 5 NO 6 NO 7 INCORRECT RECOMMENDED INSTALLATION INSTALLATION Note that a very small portion of the bulb is exposed to the direct path of medium being controlled section containing bulb h
11. reset button is operated Suffix L denotes control will operate automatically on an increase Suffix U denotes control will operate automatically on a decrease TWO STAGE TEMPERATURE CONTROL SERIES D 7435 UPPER TYPES DA 7435 DAW 7438 DAH 7435 DAE 7435 This series incor porates two single pole double throw snap switches actuated by the same Bourdon Tube The operating point of each switch is adjustable through an outside knob The change in temperature which opens and closes each switch at its respective setting is the fixed differential sensi tivity of the switch The temperature represented by the difference between the two adjustment points is the temperature spread between operation of the two switches Upper pointer indicates the operating point of the high temperature circuit Lower pointer indicates the operating point of the low temperature circuit OPERATING RANGES SERIES D 7435 With Snap Action Contacts Range Fixed Deadband No Scale Range Not To Exceed Between Switches Each Switch 4 F 2 C AF 2 5 C A F 2 5 C A F 2 5 C 5 1 6 5 F 4 C 8N 250 to 415 F 120 to 215 C 550 F 290 C 18 F 10 C 7 F 4 C 9N 350to 550 F 175 to 290 C 600 F 315 C 22 F 13 C 8 F 45 C 100 to 300 F 40 to 150 C 22 F 13 C 8 F 45 C 11N 100 to 500 F 40 to 260 C 600 F 315 C 46 F 26 C 16 F 9 C ELECTRICAL RATING AC c
12. rocess Connection RANGE TABLE NO 1 BULB 11 16 Diameter Series D Bulb for Open Tank Use Range Numbers Bulb 1 Range Numbers 6 ft Cap 1N 3N 4N No di ia Tubing 5N 7N 10N 8N 11N 9 N SS Bulb B 2 7 8 N A N A Copper Standard vwi B SS Bulb B 2 7 8 B 2 7 8 B 4 7 8 SS Cap Option Standard Standard 1 All bulbs including those with a copper capillary are made of Type 304 Stainless Steel See Note for B Dims Well Pressure Ratings Protective Well Assemblies 70 F 1000 psi 2400 psi For Series D No 2 Bulb Standard 11 16 Diameter 21 C 6890 kPa 16500 kPa 20 99 C Bulb Ass y Well Dim Well Ass y Range E Min C Brass S S C 1N 3N 4N 2 7 8 3 1 4 rer 5N 7N 10N 73 mm 83 mm 49 543 49 251SS 1 C 6 as C 6 49 2518S 1 aaa 9 7 8 3 1 4 8N 11N 73mm 83mm N A ON 124 mm 134 mm 990 F Do Not 2000 psi 285 C Use 13700 kPa 49 253855 1 Optional 11 16 Bulb amp 1 2 NPT Connection Range Numbers Optional 11 16 Bulb with 1 2 NPT Process Conn Optional 1 2 Bulb amp 3 8 Bulbs with 1 2 NPT Connection Range Numbers 1N 3N 4N 8N 11N OON 1N 3N 4N 8N 11N OONO 5N 7N 10N 5N 7N 10N Optional 9 0 A A 1 2 Bulb i with E 6 3 8 E 6 3 8 E 10 5 8 1 2 NPT B 5 3 4 B 5 3 4 B 10 Optional 3 8 Bulb with 1 2 NPT N
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