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14

Section 3

Model 288A Differential Pressure Indicating Switch

Section 3—Maintenance and Calibration

The following checks are recommended for preventive maintenance:

•

Periodically inspect alarm switch mechanism to verify that all mounting
screws are seated properly.

•

Inspect linkage for wear.

•

Inspect integrity of electrical circuits. Tighten as necessary.

When repairs are necesssary, review this section for maintenance procedures
such as bezel/lens installation and removal, pointer installation and removal,
indicator calibration, switch calibration, and switch set point changes.

IMPORTANT See Appendix A for related warning/caution notices and instructions

on DPU inspection, cleaning, service, repair, range change, and BUA
replacement.

Never perform maintenance/repair on the instrument

or DPU without ﬁ rst reviewing all procedures and warning/caution
notices in Appendix A.

Tools

The following tools are recommended for general maintenance of the Model
288A DP indicating switch.

Table 3.1—Tools

Equipment

Purpose

Pointer Puller

Pointer removal

Small Screwdriver

Calibration adjustment

Medium Screwdriver

Bezel removal and replacement

1/4" and 1/8" Open-end Wrenches

Zero (1/4") and Range (1/8") adjustments

1/8 Hex Allen Wrench

Switch set point adjustment

3/32" Hex Allen Wrench

Drive Arm Tightness Test

B ezel/Lens (or Cover) Installation and Removal

To remove the bezel and lens (or cover), perform the following steps, using
Figure 3.1 for reference.

1. Loosen the three screws on the front of bezel.
2. Tilt the bottom of the bezel and slide the bezel upward.

To reinstall the bezel and lens, assemble the components per Figure 3.1, page
15. The two snubbers (Part No. 9A-C0266-0028C) on the scale plate should
not be compressed against the lens cover and the pointer should not touch the
lens.

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Summary of Contents for 288A

Page 1: ...Mounting Piping DPU Installation 7 Electrical Connection Switches Relays 7 Switch Use 7 Startup 8 Switch and Relay Wiring Diagrams 9 Section 3 Maintenance and Calibration 14 Tools 14 Bezel Lens or Cover Installation and Removal 14 Calibration Check 15 Pointer Installation and Removal 16 Pointer Installation 16 Pointer Removal 16 Indicator Calibration 17 Drive Arm Tightness Test 19 Drive Arm Stop A...

Page 2: ...spective owners Copyright 2017 Schlumberger All rights reserved Best Practices for Set Points 22 Changing Set Point of an In Service Instrument 23 Changing Set Point of an Out of Service Instrument 24 Range Changes 24 Parts Replacement 25 Troubleshooting 26 Section 4 Assembly Drawing and Parts Lists 28 Section 5 Dimensional Drawings 34 Appendix A Model 224 DPU A 1 DPU Description A 1 Speciﬁcations...

Page 3: ...ental breakage This ring also acts as a seal between the bezel and the case to ensure a moisture fume and dust free atmosphere for the indicator and switch mechanism The large cover lens allows maximum readability of the indicat ing pointer Switches and all adjustments are readily accessible when the cover is re moved The built in switches energize either single or dual alarm circuits when the mea...

Page 4: ... the scale plate An actuat ing cam directly connected to the torque tube shaft rotates with the motion of the shaft Two cam follower roller actuator arm assemblies one for each switch respond to torque tube rotation by opening and closing the switches as they ride on and oﬀ the cam The levels of diﬀerential pressure at which the switches actuate are adjustable with high and low alarm switch adjust...

Page 5: ...ually low switches set for decreasing pressures switches 2 and 4 are usually high switches set for increasing pressures Relays Relays are actuated by internal switches and are available in several varia tions SPDT DPDT Two SPDT Two DPDT Wiring No 22 AWG is used for internal wiring and No 18 AWG is used for external wiring Diﬀerential Pressure Unit DPU For detailed information on the Model 224 DPU ...

Page 6: ...SI to 0 to 600 PSI 2 of full scale DP 0 to 601 PSI to 0 to 1000 PSI 4 1 2 of full scale DP 1 or 2 DPDT Switches S401 Add 1 2 to above values Near switch setpoint 10 full scale Add 1 2 to above values For suppressed ranges Add 1 4 to above values Switch Deadband SPDT 5 of full scale DP max DPDT 6 of full scale DP max Accuracy of Repeatability 0 25 of full scale DP Nuclear Qualiﬁcations The followin...

Page 7: ...nding on customer order The direct set switch contacts are adjustable over 5 to 95 of the scale range Table 2 1 page 8 shows switch and relay wiring color coding for legacy and current conﬁgurations Figures 2 1 through 2 6 show switch and relay wiring The high switch and low switch set point adjustment procedures are covered in Changing Switch Set Point page 22 For physical location of switches se...

Page 8: ...LY ADJUSTABLE SWITCHES Low 1 Red Yellow Blue Red Yellow Blue Low 2 White Red White Yellow White Blue White Red White Yellow White Blue High 1 Black Green White Black Violet Orange High 2 White Black White Green White Violet White Black White Violet White Orange SWITCHES FOR RELAYS Low Red Yellow Blue Note 1 White Brown Brown White Note 1 High Black Green White Note 1 White Gray Gray White Note 1 R...

Page 9: ...n the relaxed shelf condition the low switch set to trip at a position below the pointer scale position and the high switch set to trip at a position above the pointer scale position NO Normally Open in shelf condition NC Normally Closed in shelf condition C Common Figure 2 1 Low high SPDT switch diagrams current conﬁguration color codes see Table 2 1 page 8 ...

Page 10: ...10 Section 2 Model 288A Differential Pressure Indicating Switch Figure 2 2 Low high DPDT switch diagrams current conﬁguration color codes see Table 2 1 page 8 ...

Page 11: ...re Indicating Switch Section 2 Figure 2 3 3 switch diagram current conﬁguration color codes see Table 2 1 page 8 Figure 2 4 4 switch diagram 3 or 4 independently adjustable switches current conﬁguration color codes see Table 2 1 page 8 ...

Page 12: ...12 Section 2 Model 288A Differential Pressure Indicating Switch Figure 2 5 Low high switch es w SPDT relay s diagrams current conﬁguration color codes see Table 2 1 page 8 ...

Page 13: ...13 Model 288A Differential Pressure Indicating Switch Section 2 Figure 2 6 Low high switch es w DPDT relay s diagrams current conﬁguration color codes see Table 2 1 page 8 ...

Page 14: ... DPU without ﬁrst reviewing all procedures and warning caution notices in Appendix A Tools The following tools are recommended for general maintenance of the Model 288A DP indicating switch Table 3 1 Tools Equipment Purpose Pointer Puller Pointer removal Small Screwdriver Calibration adjustment Medium Screwdriver Bezel removal and replacement 1 4 and 1 8 Open end Wrenches Zero 1 4 and Range 1 8 ad...

Page 15: ...he following procedure IMPORTANT Review all procedures WARNINGS NOTICES in Appendix A BEFORE performing this procedure Figure 3 2 Slipping pointer 1 Mount the instrument in an approximately level position and connect to a standard pressure source see Mounting page A 5 2 If the zero indication is incorrect adjust it as follows a Remove the bezel lens assembly b Using a 1 4 open end wrench included ...

Page 16: ...r set at zero scale Obtain 75 to 90 pointer hub engagement on the movement pinion shaft The pinion shaft must not extend through the pointer hub It may be necessary to enlarge the hub hole using a tapered broach in cluded in the calibration toolkit Part No 9A 0288 1032B 2 Lightly tap the pointer hub with a hand set or other ﬂat end tool Use perpendicular blows to avoid bending the shaft 3 Check th...

Page 17: ... Pointer puller Part No 9A 0163 0005B Indicator Calibration A complete calibration of the instrument is required whenever the DPU as sembly is replaced IMPORTANT Review all procedures WARNINGS NOTICES in Appendix A BEFORE performing this procedure 1 Securely mount the instrument in an approximately level position and connect the DPU as described in Mounting page A 5 2 Remove the bezel lens assembl...

Page 18: ...rew Figure 3 5 and move the arm to shift the pointer in the direction of the error a distance of about 10 times the linearity error b Check to see that the drive arm clears the end of torque tube housing by approximately 0 030 in before retightening the drive arm screw to prevent interference c While supporting the block shaft tighten clamp screw until snug to shaft d Still supporting block shaft ...

Page 19: ... installation instructions on page 14 Drive Arm Tightness Test This procedure tests the tightness of the drive arm s connection to the torque tube by applying torque developed by the DPU onto a ﬁxed drive arm Care should be taken to apply pressure slowly as torque is being applied to the connection through the torque tube drive shaft 1 With the pointer at normal 0 torque tube rotation position 0 o...

Page 20: ...t is out of calibration by performing a calibration check procedure page 15 If the instrument is out of calibration before performing a complete calibration procedure remove the bezel lens and scale plate and inspect the switch mechanism Figure 3 6 to verify the following The roller rotates without wobble or binding The cam is relatively centered under the roller The actuator arm moves freely on i...

Page 21: ...steps Refer to Figure 3 7 as needed 1 Loosen the three linkage screws and turn the crank to the 12 o clock position 2 Use a 1 8 inch Allen wrench to hold the index shaft and slip the index pointer to 0 on the switch index Tighten the screw on the crank to the mid slot position 3 Turn the switch index pointer to 1 index numbers refer to numbers on outer edge of scale plate 4 Apply 10 diﬀerential pr...

Page 22: ...ent switch operation 9 Check the switch deadband actuate to reset by applying diﬀerential pressure ﬁrst in a decreasing direction then in an increasing direction opposite for high switch direction Observe pressures To reduce dead band advance the plunger screw two ﬂats maximum 10 Adjust the high switch to actuate at the desired pressure The procedure is the same as for the low switch Changing Swit...

Page 23: ...uclear Qualiﬁed Units Use the following procedure to set a set point for an instrument that is in ser vice when calibration pressures cannot be applied See Figure 3 8 for speciﬁc locations denoted by items A B C and D 1 Remove the bezel cover Do not remove the pointer or scale 2 Insert hex wrench in the switch adjust post 3 Loosen the switch lock screw item B 1 2 to 1 turn 4 With a hex wrench move...

Page 24: ...equiv for reference Change pressures slowly in discrete steps A bleed pressure method may cause errors 4 Change switch set point as described in Changing Set Point of an In Service Instrument page 23 5 Check the set point by changing measured pressure to actuate the switch For example To verify a low switch set point of 24 psid apply approxi mately 30 psi Reduce pressure to approximately 25 psid h...

Page 25: ...Wrench for new style Drive Arm 6 Carefully move the Actuator Arms away from the Cam and slide the Drive Arm Assembly oﬀ the Torque Tube 7 Disconnect the switch leads from the Terminal Block 8 Carefully remove the Grip Ring and Washer securing the Drive Link Plate assembly from the Switch and Plate Assembly and save for the installation process 9 Remove the Lock Screw securing the high side Switch ...

Page 26: ...gging or dirty Adjust or clean Pointer dragging on scale plate Adjust pointer position Inaccurate or No Electrical Alarm Power Supply Blown fuse Replace fuse Broken or loose wire Repair Alarm Switch Switch not properly adjusted Adjust switch Dirty or burned Replace switch contacts Switch Drifts set point not repeat able Process Changes Transients or surges cause switches to actuate prematurely Add...

Page 27: ...late Switch Drifts set point not repeat able Calibration Techniques Rapid pressure change or venting system During calibration make pressure changes in slow discrete steps Pressure application in reverse Test low alarm with decreasing pressure and high alarm with increasing pressure Reference gage inaccuracy Suitable pressure standard such as manometer dead weight tester or Heise type gage may be ...

Page 28: ...28 Section 4 Model 288A Differential Pressure Indicating Switch Section 4 Assembly Drawing and Parts Lists Figure 4 1 Model 288A ...

Page 29: ...060Z 10 Screw Rd Hd 6 32 x 3 8 BRS NP 9A C0111 0015J 2 11 Screw Sl Fil Hd 4 40 X 3 16 SST 9A C0114 0023J 4 12 Screw Bd Hd 4 40 x 3 16 SST 9A C0117 0012J 1 13 Screw Bd Hd 6 32 x 3 16 SST 9A C0117 0013J 4 14 Terminal Block 1 10 Position Standard 9A C0038 0033T 10 Position 14 AWG 9A C0288 1160C 12 Position 9A CS469 0061Z 15 Strip Insulator 1 10 Position Standard 9A C0038 1345T 10 Position For 14 AWG ...

Page 30: ...fzel Insulation Radiation Resistant see also item 29 A R Low SPDT 9A CS666 1200B N Low DPDT 9A CS401 0184B N Low Relay 9A CS666 0290B N Low 1 Independently Adjustable 9A CS666 0286B N Low 2 Independently Adjustable 9A CS666 0287B N Note If 3 or 4 independently adjustable switches are used Low 1 is installed in the upper left position and Low 2 is installed in the lower right position 27 External W...

Page 31: ...A C0288 0029B A R 34 Washer Spring 1 per switch 9A C0257 0019C A R 35 Screw Lock 1 per switch A R Switch 1 and 2 9A C0317 0012C Switch 3 and 4 not shown 9A CS469 0045Z 36 Washer 1 2 OD x 0 14 ID SST 1 per switch 9A C0317 0019C A R 37 Grip Ring 1 per switch 9A C0087 0011T A R 38 Link Plate 2 required when both low and high switches are used 9A C0288 1205C A R 39 Strap 9A C0288 0017C 1 40 Screw 3 48...

Page 32: ...oltage Wired SPDT Wired DPDT 115 VAC 9A CS666 0238Z 9A CS666 0245B 110 VDC 9A CS666 0231Z 9A CS666 0256B 1 High Relay Assy with Tefzel insulated wires Coil Voltage Wired SPDT Wired DPDT 115 VAC 9A CS666 0237Z 9A CS666 0246B 110 VDC 9A CS666 0230Z 9A CS666 0279B 1 Spacer Switch Plate 1 per switch used w single high switch or 3 independently adjust able switches when 3 position is not used not shown...

Page 33: ...e g PSI bar inches of water column meter etc Additional Notes 1 A R indicates as required 2 When ordering parts specify serial number of instrument 3 For 224 DPU parts refer to Table A 4 page A 18 Table 4 2 Tefzel Insulation Radiation Resistant External Wire Leads Table 4 1 Items 27 and 28 Wire Type 2 5 ft 10 ft 15 ft 20 ft Low 1 9A CS666 0213Z 9A CS666 0190Z 9A CS666 0194Z 9A CS666 0201Z High 1 9...

Page 34: ...ches mm Dim C inches mm Dim D inches mm Pressure Connection Note 1 Top Bottom 500 to 1500 3 4 to 10 3 ALL 6 1 4 158 8 2 15 16 74 6 6 15 16 176 2 5 5 8 142 9 1 2 NPT 1 2 NPT 1 4 NPT 1 4 NPT 1 4 NPT 1 2 NPT 1 4 NPT 1 2 NPT 3000 to 6000 20 7 to 68 9 ALL 6 3 8 161 9 3 1 4 82 5 7 5 16 185 7 6 152 4 1 2 NPT 1 2 NPT 1 4 NPT 1 4 NPT 1 4 NPT 1 2 NPT 1 4 NPT 1 2 NPT 1 Can be rotated 180º in the ﬁeld 2 All S...

Page 35: ...35 Model 288A Differential Pressure Indicating Switch Section 5 Figure 5 2 Model 288A side view see table in Figure 5 1 page 34 for Dim A measurements Figure 5 3 Model 288A front view ...

Page 36: ...are connected by pipe or tubing to the primary measur ing device located in the system piping Variations in diﬀerential pressure within the pressure housings cause the bellows to expand or contract laterally The linear movement of the bellows causes the torque tube to rotate which actuates the process monitoring instrument The process monitoring instrument may be an indicator a switch a transmit t...

Page 37: ...side of the bellows and must be of a material that is compatible with the liquid being measured The BUA with 5 8 inch bellows accommodates diﬀerential pressure ranges up to 1000 psi Like the BUA with 3 4 inch bellows the range springs are grouped outside the bellows The Model 224 DPU general speciﬁcations are presented in TableA 1 pageA 3 Figure A 1 Bellows Unit Assembly BUA ...

Page 38: ...cu in for full scale travel 0 14 3 6 mm 0 03 0 8 mm 0 025 0 6 mm Pressure Ranges Zero center or split ranges available on special order e g a 0 60 w c 0 1524 mm range may be ordered 30 0 30 w c 762 0 762 mm or 15 0 45 w c 381 0 1143 mm Absolute pressure ranges available from 30 w c 762 mm to 400 psi 41 4 bar Pressure Connections 1 4 NPT top x 1 4 NPT bottom 1 4 NPT top x 1 2 NPT bottom 1 2 NPT top...

Page 39: ...re up to the full rated pressure of the instrument applied to them Also since dual overrange valves are used full protection against overrange is provided in either direction An additional convolution in the high pressure bellows provides for expan sion or contraction of the ﬁll ﬂuid relative to ambient temperature changes This extra convolution acts as an accumulator permitting the ﬁll ﬂuid to ch...

Page 40: ...lling or vapor return lines with DPU piping lines Observe the following standard practices when installing piping Shorten the distance between the primary measuring device and the DPU as much as possible Distances exceeding 100 ft are not recommended For distances up to 50 ft use 1 4 in pipe or tubing For runs of 50 to 100 ft use 1 2 in pipe or tubing The recommended limitation does not apply if a...

Page 41: ...DPU Assembly Drawing and Parts List page A 17 Install a valve manifold between the DPU and the source of diﬀerential pressure to facilitate operation and checking of the DPU Install all shutoﬀ and bypass valves so they are easily accessible from the front of the instrument Locate block valves at the source of diﬀerential pressure Piping Diagrams Diagrams for typical and special ﬂow applications ar...

Page 42: ...A 7 Model 224 Differential Pressure Unit Appendix A Figure A 5 Gas Flow Hydrates Present Figure A 6 Steam Flow DPU Below Run Figure A 7 Liquid Flow DPU Above Run ...

Page 43: ...A 8 Appendix A Model 224 Differential Pressure Unit Figure A 8 Liquid Flow DPU Below Run Figure A 9 Corrosive Liquid Flow Figure A 10 Cool Non Condensing Liquid DPU Level with Tank Bottom ...

Page 44: ...A 9 Model 224 Differential Pressure Unit Appendix A Figure A 11 Cool Non Condensing Liquid DPU Below Tank Figure A 12 DPU Bottom Tank with Reference Leg ...

Page 45: ...A 10 Appendix A Model 224 Differential Pressure Unit Figure A 13 Liquid CO2 Figure A 14 Cryogenic Liquids ...

Page 46: ...A 11 Model 224 Differential Pressure Unit Appendix A Figure A 15 Bubbler System Figure A 16 Liquid Speciﬁc Gravity ...

Page 47: ...ur in the pro cess line which can displace the indicator and appear as a zero error 3 Check the manifold and piping for leaks as follows a Open the bypass valve s then open one shutoﬀ valve to pressurize the instrument b Close the shutoﬀ valve and the bypass valve c Observe the instrument for pen or pointer movement up or down the scale which could indicate leakage IMPORTANT Do not subject the DPU...

Page 48: ... pressurized Immediately stop all disassembly tighten the housing bolts and return the unit to the factory or authorized service center for repair Tag the unit and specify Gas in the Bellows 3 Carefully remove the pressure housing bolts and pressure housings IMPORTANT If a heavy buildup of solids or semi solids has accumulated inside the housing rapid removal of the housing may damage the bellows ...

Page 49: ...e of the DPU replace the BUA with a unit of the desired range Replacing the Bellows Unit Assembly BUA WARNING Review the warning under DPU Maintenance page A 12 before performing this procedure IMPORTANT Do not loosen the drive arm hole plug located on the top of the BUA center block when removing the mounting bracket If the plug is loos ened the ﬁll ﬂuid in the bellows will be lost and the unit w...

Page 50: ...per the instructions in Section 3 DPU Troubleshooting Table A 3 provides a description of commonly reported problems probable causes and corrective actions for use in troubleshooting issues involving the Model 224 DPU See Table 3 2 page 27 for Model 288A Diﬀerential Indicating Switch trouble shooting information Table A 3 Troubleshooting Tips Problem Possible Source Probable Cause Corrective Actio...

Page 51: ...o DPU piping Piping leaks on low pressure side Repair leaks Bellows Unit Gas liquid service or liquid gas service trapped in housing Vent housing Low pressure housing gasket leaks Replace gasket Range spring broken or DPU tampered with Return BUA for repair Erratic Indication Primary Element Flow pulsating Install dampening device upstream of DPU run Erratic Indication Primary Element to DPU pipin...

Page 52: ...A 17 Model 224 Differential Pressure Unit Appendix A DPU Assembly Drawing and Parts List Figure A 17 Model 224 DPU assembly drawing ...

Page 53: ... SST 3 6K SWP 1 4 x 1 4 NPT 9A C0224 1556C Housing SST 3 6K SWP 1 4 x 1 2 NPT 9A C0224 1608C Housing SST 3 6K SWP 1 2 x 1 2 NPT 9A C0224 1580C Housing CuNi 5 1K SWP 1 4 x 1 4 NPT 9A C0224 1581C Housing CuNi 5 1K SWP 1 4 x 1 2 NPT 9A C0224 1616C Housing CuNi 5 1K SWP 1 2 x 1 2 NPT 9A C0224 1655C Housing CuNi 5 1K SWP Absolute 9A C0224 1651C 7 Screw Housing 4 Soc Head Screw 1 4 28 x 2 1 2 SST 17 4 f...

Page 54: ...Figure A 18 Model 224 DPU dimensional drawing Table A 5 Model 224 DPU Dimensions SWP psi Dim A in mm Dim B in mm DIM C in mm DIM D in mm DIM E in mm 500 or 1500 2 15 16 74 6 5 5 8 142 9 6 15 16 176 2 4 3 4 120 6 3 1 8 79 4 6000 3 1 4 82 6 6 152 4 7 5 16 185 7 4 55 64 123 4 3 76 2 ...

Page 55: ... EXCLUDES ALL OTHER EXPRESSED OR IMPLIED WARRANTIES OF MERCHANTABILITY OR FITNESS FOR A PARTICULAR PURPOSE OR OTHERWISE 2 Components manufactured by any supplier other than Cameron shall bear only the war ranty made by the manufacturer of that product and Cameron assumes no responsibility for the performance or reliability of the unit as a whole 3 In no event shall Cameron be liable for indirect i...

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