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Fisher 4194B Series Instruction Manual

Differential pressure controller
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4194A, B, and C Series
4194A, B, and C Series Differential Pressure
Controllers
Contents
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3. 4194A Series Proportional-Only Con-
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Fisher, Fisher-Rosemount, and Managing The Process Better are marks owned by Fisher
Controls International, Inc. or Fisher-Rosemount Systems, Inc.
All other marks are the property of their respective owners.
Fisher Controls International, Inc. 1983, 1995; All Rights Reserved
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Controllers and 4194C Series Propor-
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General Calibration Instructions
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Instruction Manual
Form 5196
November 1995
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Summary of Contents for Fisher 4194B Series

  • Page 1: Table Of Contents

    ......4–11 Fisher, Fisher-Rosemount, and Managing The Process Better are marks owned by Fisher Controls International, Inc. or Fisher-Rosemount Systems, Inc.
  • Page 2 ....5–32 (4194B Series) ..... . .

  • Page 3: Introduction

    If Specifications there are any questions concerning these instructions contact your Fisher Controls sales representative or Specifications for the 4194A, B, and C Series control- sales office before proceeding. lers are listed in table 1-1.
  • Page 4 1. These terms are defined in ISA Standard S51.1-1979 3. Scfh—Standard cubic feet per hour (60 F and 14.7 psia). Normal m /hr—Normal cubic 2. Consult your Fisher Controls sales office or sales representative for additional meters per hour (0 C and 1.01325 bar, absolute). information...
  • Page 5 4194A, B, and C Series Table 1-2. Available Configurations for 4194A, 4194B, and 4194C Series Controllers MODES OPTIONS Proportional- Proportional- Proportional- Internal TYPE Plus-Reset- Remote SERIES Only Plus-Reset Auto/Manual Anti-Reset Windup NUMBER Plus-Rate Set point (One-Mode (Two-Mode Station (suffix letter F) (Three-Mode (suffix letter M) Controllers)
  • Page 6 4194A, B, and C Series 1–6...

  • Page 7: Installation

    4194A, B, and C Series Section 2 TYPE 657 ACTUATOR Installation TYPE 4194 CONTROLLER Controller Mounting Orientation Mount the controller with the housing vertical, as shown in figure 2-1, so that the vent points down. Pipestand Mounting Refer to figure 2-2. Pipestand mounting parts are pro- vided to mount the controller to a 2-inch (nominal) pipe.
  • Page 8 4194A, B, and C Series 49A3196-A A6732 / IL Figure 2-2. Pipestand Mounting 36A9760-A A6733 / IL 36A9761-B A6734 / IL Figure 2-3. Panel Mounting Figure 2-4. Wall Mounting lines should slope downward to the instrument for liq- needle valve in a process pressure sensing line to uid-filled lines and upward toward the instrument for dampen pulsations.

  • Page 9: Supply Pressure Connection

    Due to the variability in nature A3001 / IL Figure 2-5. Location of Connections of the problems these influences can have on pneumatic equipment, Fisher Vent Controls has no technical basis to rec- ommend the level of filtration equipment...
  • Page 10 4194A, B, and C Series The vent must be protected against the entrance of must be protected against the entrance of any foreign any foreign material that could plug it; or, if a remote material that could plug it. Check the vent periodically vent is not required, the vent opening in the case, to be certain it is not plugged.

  • Page 11: Adjustments For 4194A Series Controllers

    4194A, B, and C Series METAL BALL SWITCHING ZONE INDICATOR LOADER KNOB AUTO/MANUAL SWITCH W3679 / IL SET POINT INDICATOR PROCESS POINTER PROPORTIONAL BAND ADJUSTMENT PROPORTIONAL BAND INDICATOR COVER OUTPUT PRESSURE GAUGE W6391 / IL Figure 3-1. 4194A Series Controller Adjustment Locations Section 3 If the controller is equipped with the optional internal or external set point adjustment, turn the adjustment...

  • Page 12: Changing Controller Action

    4194A, B, and C Series Refer to figure 3-1 if the controller has the auto/manu- al station (suffix letter E). To switch from automatic to manual mode, or from manual to automatic, you must first balance the manual output with the controller out- put.

  • Page 13: Startup For 4194A Series Controllers

    4194A, B, and C Series last mark on the left side of the scale. If the last scale For example: mark is 0 psig, a pressure source is not required. 2 Psig 7. The controller output pressure should be 0 psig. 30 Psig 4.

  • Page 14: Remote Set Point (Suffix Letter M) Zero And Span Calibration

    4194A, B, and C Series Remote Set Point (suffix letter M) Zero Refer to figures 3-1 and 3-3 for adjustment locations. and Span Calibration 1. Remove the two screws (key 6) and lift off the pro- Refer to figures 3-1 and 3-3 for adjustment locations. portional band indicator cover (key 36).
  • Page 15 4194A, B, and C Series POINTER ZERO ADJUSTMENT POINTER ZERO ADJUSTMENT LOCKING SCREW REMOTE SET POINT PROCESS POINTER REMOTE SET POINT ZERO ADJUSTMENT ZERO ADJUSTMENT SPAN ADJUSTMENT (SUFFIX LETTER M) LOCKING SCREW (SUFFIX LETTER M) W6391 / IL 39A1126-B 56A9752-S SHT 1 A6730 / IL Figure 3-3.

  • Page 16: Flapper Alignment

    4194A, B, and C Series 12. If necessary, perform the process indicator zero just flapper leveling screw 3 (the screw nearest the and span calibration procedure in this section. Other- nozzle). wise, perform the flapper alignment procedure in this 8. Set the proportional band to 30 percent REVERSE. section.

  • Page 17: Remote Set Point (Suffix Letter M) Operation

    4194A, B, and C Series RESET BELLOWS (VENTED) SET POINT INDICATOR REVERSE ACTION QUADRANT PROPORTIONAL BELLOWS PROPORTIONAL BAND ADJUSTMENT FEEDBACK PROCESS POINTER LINK REMOTE SET POINT CONNECTED HERE FEEDBACK INPUT ELEMENT MOTION FLAPPER PIVOT CONNECTED HERE DIRECT ACTION QUADRANT INPUT CONNECTING MOTION LINK...
  • Page 18 4194A, B, and C Series MANUAL LOADER AUTOMATIC POSITION AUTO/MANUAL SWITCH MANUAL LOADER KNOB PLASTIC TUBE OUTPUT PRESSURE TO FINAL CONTROL METAL BALL ELEMENT MANUAL RELAY POSITION AUTO/MANUAL SWITCH SUPPLY PRESSURE OUTPUT PRESSURE TO FINAL CONTROL RELAY OUTPUT PRESSURE ELEMENT SUPPLY PRESSURE MANUAL LOADER OUTPUT PRESSURE 48A5230-A...

  • Page 19: Series Proportional-Plus-Reset

    Section 4 point, and to the left to decrease it. Adjusting the set point does not affect the proportional band setting. 4194B Series Proportional- If the controller is equipped with the optional internal or Plus-Reset Controllers And 4194C external set point adjustment, turn the adjustment...

  • Page 20: Changing Controller Action

    4194A, B, and C Series ing the minutes per repeat provides a slower reset action. Rate Adjustment To adjust rate, open the controller cover and locate the RATE adjustment. Rotate the adjustment clockwise to decrease the minutes (less rate action) or counter- clockwise to increase the minutes (more rate action).

  • Page 21: Prestartup Checks For 4194B And C Series Controllers

    4194A, B, and C Series Prestartup Checks for 4194B and C Startup for 4194B and C Series Series Controllers Controllers Perform the prestartup checks and, if necessary, cali- Refer to figure 4-1 for adjustment locations and refer brate the controller prior to this procedure. to figure 5-21 for key number locations.

  • Page 22: Calibration Of 4194B And C Series Controllers

    4194A, B, and C Series the system again by changing the set point. Continue Do not use the gauges supplied with the controller dur- this procedure until the system cycles. At this point, ing calibration. Monitor process pressure, supply pres- double the proportional band setting (proportional sure, controller output pressure, and, if applicable, re- band setting...
  • Page 23 4194A, B, and C Series RATE ADJUSTMENT RESET ADJUSTMENT W3599–1 / IL W6392 / IL SCREW 1 SCREW 2 SCREW 3 PROCESS REMOTE SET POINT POINTER SPAN SPAN ADJUSTMENT ADJUSTMENT (SUFFIX LETTER M) 59A9752-S SHT 1 39A1126-B A6731 / IL Figure 4-3.

  • Page 24: Remote Set Point (Suffix Letter M) Zero And Span Calibration

    4194A, B, and C Series 9. Adjust the process pointer to within 1 percent of 8. Adjust the remote set point pressure to the mid- the mid-scale mark by loosening the locking screw and range value. turning the zero adjustment screw. This distributes the 9.
  • Page 25 4194A, B, and C Series 2. If necessary, remove the two machine screws (key 6) and lift off the proportional band indicator cover (key 36). 3. Provide regulated supply pressure to the controller. Do not exceed the normal operating pressure in table 1-4.

  • Page 26: Anti-Reset Windup Differential Relief Valve (Suffix Letter F) Calibration

    4194A, B, and C Series 19. If the controller does not perform as indicated in Note steps 13 through 18, the flapper is not correctly Because of the high controller gain with aligned. This may occur because the output was not the reset adjustment at 0.01 minutes per sufficiently stabilized in steps 8 through 12.

  • Page 27: Principle Of Operation For 4194B And C Series Controllers

    Do not exceed the normal operating pressure in Refer to the schematic diagram in figure 4-5 for the table 1-4. 4194B Series controllers, or to the schematic diagram in figure 4-6 for the 4194C Series controllers. Note The input element is connected to the process pointer and to the flapper by connecting links.

  • Page 28: Anti-Reset Windup (Suffix Letter F) Operation

    VALVE 46A9764–C B1908–4 / IL Figure 4-5. 4194B Series Controller Schematic direction of the flapper motion versus input motion is to the change quickly with high gain, but not long reversed as shown in the flapper detail of figure 4-5 or enough for the high gain to cause instability.
  • Page 29 4194A, B, and C Series SET POINT REVERSE ACTION RESET BELLOWS INDICATOR QUANDRANT PROPORTIONAL BELLOWS PROPORTIONAL BAND ADJUSTMENT FEEDBACK LINK PROCESS POINTER REMOTE SET POINT CONNECTED HERE FEEDBACK FLAPPER MOTION INPUT ELEMENT PIVOT CONNECTED HERE DIRECT ACTION QUADRANT CONNECTING INPUT MOTION LINK BEAM OUTPUT PRESSURE...
  • Page 30 4194A, B, and C Series RELAY OUTPUT PRESSURE RESET RATE VALVE VALVE GAIN LIMITER RESET PROPORTIONAL BELLOWS BELLOWS 19A5000–A A3237–2 / IL Figure 4-7. Reset-Rate Schematic the output side of the relay as shown in figure 4-8. position, the relay output is channeled through the Supply pressure to the relay is also applied to the switch to become the controller output.
  • Page 31 4194A, B, and C Series MANUAL LOADER AUTOMATIC POSITION AUTO/MANUAL SWITCH MANUAL LOADER KNOB PLASTIC TUBE OUTPUT PRESSURE TO FINAL CONTROL METAL BALL ELEMENT MANUAL RELAY POSITION AUTO/MANUAL SWITCH SUPPLY PRESSURE OUTPUT PRESSURE TO FINAL CONTROL RELAY OUTPUT PRESSURE ELEMENT SUPPLY PRESSURE MANUAL LOADER OUTPUT PRESSURE 48A5230-A...
  • Page 32 4194A, B, and C Series 4–14...

  • Page 33: Maintenance

    Refer to figure 5-1. Because of the care Fisher Controls takes in meeting all manufacturing requirements (heat treating, dimen- 1. Adjust the set point indicator (either manually or sional tolerances, materials of construction, and other...
  • Page 34 4194A, B, and C Series Table 5-1. Troubleshooting Chart Fault Possible Cause Check Correction 1. Process wanders or cycles about 1.1 Proportional band and reset 1.1 Refer to the Start-up section for 1.1 If stable control cannot be set point settings controller settings.
  • Page 35 4194A, B, and C Series Table 5-1. Troubleshooting Chart (Continued) Fault Possible Cause Check Correction 2. Controlling off set point as 2.7 Reset valve leaks. 2.7 Adjust output to 15 psig (1.0 2.7 Replace the reset valve. reflected by process and set point bar) for a 3 to 15 psig (0.2 to 1.0 indicators.
  • Page 36 4194A, B, and C Series Table 5-1. Troubleshooting Chart (Continued) Fault Possible Cause Check Correction 6. Controller will not attain full 6.6 Relay malfunction 6.6 Manually push the flapper away 6.6 If the output does not change output range. from the nozzle. The output as described, remove the relay.

  • Page 37: Replacing The Relay

    4194A, B, and C Series CLEAN-OUT WIRE EXHAUST PORT (NO O-RING USED) O-RINGS W3440 / IL RELAY RELAY MOUNTING SCREWS W5744 / IL Figure 5-2. Relay Construction 6. Perform the appropriate Flapper Alignment proce- dure in section 3 or 4. W3492 / IL Replacing the Case and Cover Figure 5-1.

  • Page 38: Replacing The Gauges

    4194A, B, and C Series Replacing the Supply Gauge, 8. Perform the controller calibration procedures and, if necessary, the appropriate remote set point calibration Proportional, Reset, and Reset Valve procedure in section 3 or 4. Tubing Assemblies 9. Mount the controller as described in the Installation 1.
  • Page 39 4194A, B, and C Series RELAY NOZZLE TUBING MYLAR WASHER ASSEMBLY WASHER (KEY 20) (KEY 18) SCREW (KEY 19) E-RING (KEY 27) RETAINING CLIP (KEY 26) O-RING PROPORTIONAL BAND ADJUSTMENT (KEY 25) ADJUSTABLE MYLAR SET POINT WASHER PIVOT ASSEMBLY (KEY 22) (KEY 17) NOZZLE SET POINT...
  • Page 40 4194A, B, and C Series 12. Remove the retaining clip (key 26). 13. Remove the proportional band adjustment knob (key 25) and Mylar washer from the set point beam assembly (key 23). HOLE 14. Inspect the nozzle assembly (key 21), and replace it if necessary.
  • Page 41 4194A, B, and C Series assembly (key 18). Apply full supply pressure with the LOCKING ADJUSTABLE SET POINT PIVOT ASSEMBLY nozzle capped and check for leaks. Remove supply pressure. 32. Install the set point beam bias spring (key 28) into the frame bore and onto the spring seat on the set point beam assembly.

  • Page 42: Replacing The Flapper Assembly And Flapper Flexure Pivot Assembly

    4194A, B, and C Series 41. Remove the tape and move the process pointer 7. Unscrew the nut that secures the relay nozzle tub- until the controller output equals the pressure recorded ing assembly (key 18) to the frame manifold (key 135). in step 39.
  • Page 43 4194A, B, and C Series PROPORTIONAL BELLOWS BELLOWS BRACKET (KEY 31) ADJUSTABLE SET POINT PIVOT ASSEMBLY (KEY 17) SCREW AND WASHER (KEYS 19 AND 20) LINK 4 LINK 2 W4199 / IL Figure 5-7. Bellows Assembly and Proportional Band Adjustment (Process Scale and Proportional Band Adjustment Cover Removed) FLAPPER LEVELING FLAPPER...
  • Page 44 4194A, B, and C Series LINK 4 LINK 4 ADJUSTMENT assembly (key 18). Apply full supply pressure with the nozzle capped (to obtain maximum output pressure) and check for leaks. Remove supply pressure. 33. Install the set point beam bias spring (key 28) into the frame bore and onto the spring seat on the set point beam assembly, as shown in figure 5-3.

  • Page 45: Replacing The Proportional Or Reset Bellows

    4194A, B, and C Series LEVELING SCREW NUMBER 1 CONNECTING TAB ON FLAPPER ASSEMBLY 1/2 OF PIN W4191 / IL DIAMETER W3451 / IL Figure 5-11. Link 2 Adjustment (0.2 to 1.0 bar) output signal range or between 6 and of the case.
  • Page 46 4194A, B, and C Series FOUR SCREWS (KEY 6) lows bracket (key 31) and into the proportional bel- lows. Do not tighten. 12. Place the washer (key 362) on the second ma- RESET chine screw (key 35) and start the screw through the BELLOWS bellows bracket (key 31) into the reset bellows.

  • Page 47: Replacing The Reset Restriction Valve (4194B Series)

    (4194B Series) 15 psig (0.2 to 1.0 bar) output or 6 psig (0.4 bar) for a Refer to the 4194B Series portion of figure 5-21 for 6 to 30 psig (0.4 to 2.0 bar) output. Record the pro- key number locations.

  • Page 48: Replacing The Anti-Reset Windup (Suffix Letter F) Differential Relief Valve

    4194A, B, and C Series Replacing the Anti-Reset Windup (suffix 2. Remove the two machine screws (key 71) on the side of the rate/reset valve assembly (key 262). letter F) Differential Relief Valve 3. Gently pull the rate tubing assembly away from the Refer to the 4194B or 4194C Series suffix letter F por- rate/reset assembly and remove the gasket (key 5) tion of figure 5-21 for key number locations.

  • Page 49: Replacing The Links

    4194A, B, and C Series LINK 5 LINK 1 LINK 4 LINK 4 ADJUSTMENT to the top hole (the hole furthest from the pointer piv- ot). 4. Move the set point indicator, manually or with re- mote set point pressure, to the mid-scale mark on the process scale and set the proportional band between DIRECT and REVERSE.

  • Page 50: Replacing Link 3

    4194A, B, and C Series ALIGNED ZERO ADJUSTMENT MISALIGNED FINE ZERO W3443-1 / IL LOCKING SCREW ADJUSTMENT W3475-1 / IL Figure 5-14. Process Pointer Alignment 8. Connect link 2 to the flapper assembly. 7. Apply process differential pressure to position the process pointer at the mid-scale mark on the process 9.

  • Page 51: Replacing Link 5

    CLOSED (4194B) or OFF SCREW (4194C) position. 5. For controllers with reset (4194B Series) or reset and rate adjustments (4194C Series), disconnect the tubing that connects the reset bellows to either the reset restriction valve (key 54) or the rate/reset valve assembly (key 262).

  • Page 52: Replacing The Capsular Element Assembly

    4194A, B, and C Series GUIDE 3. Disconnect the process pressure connection FLEXURE unions (key 93) from the pedestal assembly (key 81). Use two 5/16-inch hex wrenches. 4. Remove the four mounting screws (key 127) that DRIVE attach the capsular element assembly to the indicator FLEXURE assembly (key 101).

  • Page 53: Replacing The Short Pivot Assembly

    4194A, B, and C Series 11. Replace the tie bar (key 97). BEARING END BUSHING 12. Perform the capsular element maintenance cal- ibration procedures in this section. Perform the con- ADJUSTMENT ARM troller calibration procedures and, if necessary, per- form the appropriate remote set point calibration procedure in section 3 or 4.

  • Page 54: Replacing The Process Tubing

    4194A, B, and C Series Note 2. Loosen the screw (key 98) that holds the guide flexure to the tab on the mounting plate (key 77). The See figure 5-18. The adjustment arm of guide flexure location is shown in figure 5-17. the long pivot clevis assembly is con- 3.

  • Page 55: Zero And Span Adjustment

    4194A, B, and C Series the capsules. Tighten the screw to set the length of pressure adjusted to the normal operating pressure the pivot adjustment arm in that position. (see table 1-4). Plug the controller output or connect it to a gauge. Monitoring the controller output is not nec- essary.
  • Page 56 ADJUSTMENT W3599–1 / IL ZERO ADJUSTMENT ZERO ADJUSTMENT ADJUSTMENT LOCKING SCREW NOTES: AVAILABLE ON 4194B SERIES ONLY. W6392 / IL AVAILABLE ON 4194B AND C SERIES SUFFIX LETTER F ONLY. SCREW 1 SCREW 2 SCREW 3 PROCESS REMOTE SET POINT...

  • Page 57: Remote Set Point (Suffix Letter M) Maintenance

    4194A, B, and C Series ment clockwise to increase the span. Adjust the proved with the linearity adjustment. See figure 5-17 span adjustment screw to correct for half of the for the linearity adjustment screw location. error. a. If the error at mid-scale is high (process pointer is to the right side of the mid-scale mark), loosen b.

  • Page 58: Replacing Remote Set Point Assembly Parts

    4194A, B, and C Series GUIDE FLEXURE MOUNTING SCREW DRIVE FLEXURE ADJUSTMENT LINK A SCREW LOWER TRAVEL STOP PIVOT ASSEMBLY A UPPER TRAVEL LINK B STOP LINEARITY ADJUSTMENT PIVOT ASSEMBLY B MOUNTING SCREW TIE BAR CAPSULES REMOTE SET POINT ZERO ADJUSTMENT SCREW ZERO ADJUSTMENT LOCKING SCREW 36A9751-C B1668-4 / IL...

  • Page 59: Replacing Pivot Assembly B (Key 115)

    4194A, B, and C Series 5. Remove the screw (key 122), washer (key 123) 15. Perform the remote set point maintenance calibra- and nut (key 124) that attach the guide flexure (key tion procedures. Perform the appropriate process indi- 119) to the top of the pivot assembly. cator zero and span calibration and flapper alignment procedures in section 3 or 4.

  • Page 60: Replacing The Remote Set Point Tubing

    4194A, B, and C Series 4. Decrease the remote set point pressure to 0 psig. to the set point indicator in the same position as noted in step 1. 5. Perform the remote set point maintenance calibra- tion procedure. Perform the appropriate process indi- 4.

  • Page 61: Setting The Travel Stops

    4194A, B, and C Series Note 3. Set the length of link A (key 116) so the lever arms of pivot assembly A and pivot assembly B are parallel See figure 5-18. The adjustment arm of and link A is perpendicular to them. the remote set point pivot assembly A 4.

  • Page 62: Remote Set Point Linearity Adjustment

    4194A, B, and C Series b. To decrease the span further than the adjust- positive and the other negative, perform the remote ment screw allows, move both ends of link A (key set point zero and span adjustment procedure to cor- 116) to the left.

  • Page 63: Replacing The Switch Body Assembly

    4194A, B, and C Series Uneven tightening could damage the 6. Loosen the two screws (key 290), and separate the tubing assembly. switch body assembly (key 291) from the loader as- sembly (key 282). 10. Position the auto/manual station as far down on 7.

  • Page 64: Replacing The Loader Range Spring, Diaphragm Assembly, Ball Seat, Tubing, And Ball

    4194A, B, and C Series 21. Drive in the groove pin (key 303) to hold the phragm assembly (key 281) between the main halves switch lever. of the loader assemblies. 22. Replace the lever cover plate (key 305), and at- tach with two screws (key 288).
  • Page 65 4194A, B, and C Series 38A3819-B / DOC SEE VIEW E 56A9752-S SHT 1 / DOC APPLY LUB/SEALANT NOTE: KEY 4 GASKET IS USED BETWEEN INTERNAL FRAME AND FRAME MANIFOLD. KEY 5 GASKET IS USED BETWEEN FRAME MANIFOLD AND RATE/RESET MANIFOLD. Figure 5-21.
  • Page 66 4194A, B, and C Series 56A9752-S SHT 2 / DOC Figure 5-21. Controller Assembly Drawings (cont’d) 5–34...
  • Page 67 4194A, B, and C Series 56A9752-S / DOC Figure 5-21. Controller Assembly Drawings (cont’d) 5–35...
  • Page 68 4194A, B, and C Series 56A9752-S / DOC Figure 5-21. Controller Assembly Drawings (cont’d) 5–36...
  • Page 69 4194A, B, and C Series 36A6985-C / DOC Figure 5-22. Process and Set Point Indicator Assembly 5–37...
  • Page 70 4194A, B, and C Series 58A0706-C / DOC Figure 5-23. Capsular Element Assembly 5–38...
  • Page 71 4194A, B, and C Series 39A1126-H / DOC Figure 5-24. Indicator Assembly APPLY LUB 32B0257-A / DOC Figure 5-25. Type 83U Relay 5–39...
  • Page 72 4194A, B, and C Series APPLY LUB/SEALANT 36A6988-C / DOC Figure 5-26. Remote Set Point Assembly Drawing 5–40...
  • Page 73 4194A, B, and C Series 48A2905-A SHT 1 / DOC APPLY LUB/SEALANT 48A2905-A SHT 2 / DOC Figure 5-27. Auto/Manual Station Assembly Drawing 5–41...
  • Page 74 4194A, B, and C Series APPLY LUB/ADHESIVE 56A9752-S / DOC Figure 5-28. Internal and External Set Point Option 5–42...

  • Page 75: Parts

    Parts Controller Common Parts (figure 5-21) Parts Ordering Note Whenever corresponding with your Fisher Controls sales office or representative about this equipment, Figure 5-21 shows key numbers for the always mention the controller serial number. When construction of the Fisher Type 4194A, ordering replacement parts, refer to the 11-character 4194B, and 4194C controller.
  • Page 76 For 4194CF, CFM, CFE and CFME (1 req’d) 1P2796 X0012 pressure plastic/aluminum/stainless steel see Key 56 table Reset Valve Tubing Ass’y (4194B series only) Pressure control block, CF8M (316 SST Casting) Copper/Brass 16A6949 X012 For female process connections (2 req’d)
  • Page 77 4194A, B, and C Series Description Part Number Description Part Number Cap screw, hex hd, SST Machine screw, fill hd, S18800 (18-8 SST) 2 req’d for use w/each pressure 2 required to mount remote set pt ass’y control block (key 57) 1A3525 38992 (suffix letter M) to base plate of Hex reducing nipple, 1/2-inch NPT male...

  • Page 78: Process And Set Point Indicator Assembly

    5-23. (key 89) and the long pivot clevis ass’y (key 78) to the mounting plate (key 77) Fisher Controls offers capsular element ass’ies in a wide variety of (4 req’d) 18A0703 X022 Machine screw, pan hd, S18800 (18-8 SST) ranges and materials of construction.

  • Page 79: Remote Set Point Assembly

    4194A, B, and C Series Description Part Number Description Part Number Nozzle and adaptor ass’y, aluminum/sapphire Diaphragm ass’y extension, A92011 (aluminum) 18A1739 X012 3 to 15 psig (0.2 to 1.0 bar) output 12B0250 X012 Machine screw, fill hd, S18800 (18-8 SST) 6 to 30 psig (0.4 to 2.0 bar) output 12B0251 X012 (3 req’d)

  • Page 80: Controller Mounting Parts

    Lock washer, pl steel (5 req’d) 1C2257 28982 Mounting bracket, A569 (pl steel) 36A9754 X012 Contact your Fisher Controls sales of- Cap screw, hex hd, pl steel (2 req’d) 1C3791 24052 fice or representative for any additional Mounting bracket, G10100 (pl steel) parts required for controller mounting.

  • Page 81: Regulator Mounting Parts

    4194A, B, and C Series Description Part Number Description Part Number Regulator Mounting Parts Fittings Fittings for 3/8-inch copper tubing, casing- or Regulator Mounting Parts for Casing-Mounted yoke-mounted controller with regulator Regulator Connector, brass (2 req’d) 1B8856 18992 Cap screw, hex hd, pl steel (2 req’d) 1A5828 24052 Elbow, brass (2 req’d) 1B8846 18992...
  • Page 82 4194A, B, and C Series For information, contact Fisher Controls: Marshalltown, Iowa 50158 USA Cernay 68700 France Sao Paulo 05424 Brazil Singapore 0512 6–8 Printed in U.S.A.

This manual is also suitable for:

4194a series4194c series

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