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Model 580A Differential Pressure Switch

Section 3

Section 3—Maintenance and Calibration

The following checks are recommended for preventive maintenance:

•

Periodically inspect the alarm switch mechanism to verify that all mount

ing 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. Refer

to Figure 3.1 as needed for component identification.

SWITCH LOCKS

ZERO ADJUST

POINTER STOP

3/4 NPT (INTERNAL)

CONDUIT CONNECTOR

20 FT (6.1 M) LG

18 AWG EXT LEADS STANDARD;

40 FT (12.2 M) LG LEADS OPTIONAL

SWITCH ADJUST 1/8 (3.2)

HEX 1/8 DP

TO ADJUST SWITCH SETTING

REMOVE SCREWS AND COVER

RANGE ADJUST

POINTER

Figure 3.1—Model 580A adjustment controls

IMPORTANT: Never perform maintenance/repair on the Model 580A differential pres-

sure switch without first reviewing all procedures and warning/caution

notices in this manual. See

Appendix A, page A-1,

for related warning/

caution notices and instructions for the Model 224 DPU.

Содержание BARTON 580A

Страница 1: ... Specifications 7 Section 2 Installation 9 Mounting Piping DPU Installation 9 Electrical Connection 9 Switch Use 9 Startup 10 Switch Wiring 10 Section 3 Maintenance and Calibration 11 Tools 12 Bezel Lens Assembly or Cover Installation and Removal 12 Pointer Installation and Removal 13 Pointer Installation 13 Pointer Removal 14 Scale Plate Installation and Removal 14 Indicator Calibration 15 Drive ...

Страница 2: ... response that is not planned Changing Switch Set Point 20 Definitions of Terms 20 Best Practices for Set Points 20 Changing Set Point of an In Service Instrument Not Recommended for Nuclear Qualified Units 21 Changing Set Point of an Out of Service Instrument 22 Range Changes 22 Troubleshooting 23 Section 4 Assembly Drawing and Parts List 25 Section 5 Dimensional Drawings 33 Appendix A Model 224 ...

Страница 3: ...as a solid metal cover and provides no visual indication of differential pressure Blind Switch with Internal Indicator Unlike the indicating model with the glass lens there is no externally visible indicator However internally components are the same as in Model 580A 0 With the cover removed a user can use the internal indicator to determine DPU input pressure when making adjustments to the switch...

Страница 4: ...components Left Switch Right Switch Left Switch Lock Screw Plunger Screw Actuating Cam Left Switch Adjustment Assembly Switch Adjust Linkage Plunger Screw Right Switch Lock Screw Terminal Strip Switch Adjust Linkage Right Switch Adjustment Assembly Cam Actuator Switch Adjustment Assembly includes crank index shaft and index pointer Figure 1 2 580A without indicator internal components The cam rota...

Страница 5: ...NTACTS GREEN WHITE GREEN BLACK A LEFT B RIGHT YELLOW BLUE YELLOW RED SWITCH A LEFT SWITCH B RIGHT SWITCH A LEFT SWITCH B RIGHT Notes 1 CAM ROTATES COUNTER CLOCKWISE WITH INCREASED DIFFERENTIAL PRESSURE 2 EACH SWITCH MAY BE SET AT ANY POINT FROM 10 TO 90 OF DP RANGE 3 WIRES No 22 AWG Internal and No 18 AWG External Figure 1 3 Switch wiring connections and actuation example Wiring Each switch is wir...

Страница 6: ... 1 2 Indicator Repeatability 0 5 of calibrated span Safe Working Pressure 500 1000 1500 3000 or 6000 psig Maximum Overrange To safe working pressure Process Connections 1 4 x 1 4 1 4 x 1 2 1 2 x 1 4 and 1 2 x 1 2 top x bottom Electrical Connections Female 3 4 NPT 20 ft color coded Tefzel insulated 18 AWG wire 40 ft leads available by special order Torque Tube Rotation 8 nominal 1 2 5 of calibrated...

Страница 7: ... 95 R H Seismic qualifications OBE 6 25 Gs series of 5 SSE 12 5 Gs 5 critical damping No resonance in frequencies below 33 Hz Mechanical aging included 25 000 pressure cycles during accelerated aging 12 500 electrical cycles during accelerated aging Vibration cycling using 0 2 G sinusoidal sweeps over the 1 to 200 Hz range at 1 0 octave min 1 Qualified Life This equipment contains some organic mat...

Страница 8: ...8 Section 1 Model 580A Differential Pressure Switch ...

Страница 9: ...rface of the instrument shall not exceed those in the R3 580A 29 Qualification Report Interfacing process tubing and conduit shall be supported by the same mounting as the DP instru ment base in order to minimize relative motion of the DP instrument and connections Dimensional drawings are provided on Section 5 Dimensional Drawings page 33 See Appendix A page A 1 for Model 224 DPU installation and...

Страница 10: ...iring IMPORTANT Figure 2 1 shows switch contacts in 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 LOW HIGH SPDT SWITCHES NO NO C C NC NC RED YELLOW BLUE RED YELLOW BLUE WHITE GREEN B...

Страница 11: ...oval indicator calibration switch calibration and switch set point changes Refer to Figure 3 1 as needed for component identification SWITCH LOCKS ZERO ADJUST POINTER STOP 3 4 NPT INTERNAL CONDUIT CONNECTOR 20 FT 6 1 M LG 18 AWG EXT LEADS STANDARD 40 FT 12 2 M LG LEADS OPTIONAL SWITCH ADJUST 1 8 3 2 HEX 1 8 DP TO ADJUST SWITCH SETTING REMOVE SCREWS AND COVER RANGE ADJUST POINTER Figure 3 1 Model 5...

Страница 12: ...all the screws in the bezel to secure all components to the case Torque the screws per Table 4 3 page 31 To reinstall the cover 580A 2 install the O ring in the groove of the case and realign the screw holes in the cover with the holes in the case Reinstall the screws in the cover to secure it to the case Torque the screws per Table 4 3 page 31 Calibration Check To ensure the unit calibration is w...

Страница 13: ...adjustments are necessary If the indication is not within specified limits perform a complete calibration see Indicator Calibration page 15 6 Make sure the instrument zero indication is correct otherwise repeat step 2 7 Verify the switch set points refer to Changing Switch Set Point page 20 Pointer Installation and Removal During adjustment and calibration of the unit it may be necessary to remove...

Страница 14: ... puller along the pointer until the pin protruding from the tip of the screw in the pointer puller is directly over the movement shaft and the arms of the pointer puller are directly under the pointer 2 Gently turn the knurled head of the screw clockwise pushing the pin against the movement shaft and lifting the pointer with the arms Finger pressure should be sufficient to pull the pointer free If...

Страница 15: ...l 580A differential pressure switch with indicator the indicator must be recalibrated This procedure does not ap ply to the 580A 2 blind switch without indicator IMPORTANT Review all Model 224 DPU procedures and WARNINGS NOTICES in Appendix A page A 1 before performing this procedure 1 Securely mount the instrument in an approximately level position and connect the DPU as described in Mounting pag...

Страница 16: ...snug to the shaft d Still supporting the block shaft tighten the clamp screw an addition al 1 3 to 1 2 turn This screw can normally turn one full revolution before breaking e Perform the Drive Arm Tightness Test described on page 17 before returning the instrument to service 1 8 WRENCH PN 9A 0163 0044C CLAMP SCREW DRIVE ARM LINK SINTERED CLAMP BLOCK TO TIGHTEN 03 approx M224 SHAFT Figure 3 5 Drive...

Страница 17: ...lowly 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 on a normal 0 to 100 scale unit adjust the drive arm stop bracket or use alternate means to prevent the pointer from moving the stop bracket interferes with drive arm movement IMPORTANT On reverse acting split range units it will be necessary to pres...

Страница 18: ... on its pivot All switch mounting screws are tight Linkages are straight and do not bind at the pivots Correct any problems that are observed If no problems are observed proceed with a complete calibration SWITCH ACTUATOR ARM STOP SCREW PLUNGER SCREW CAM ROLLER CAM Figure 3 6 Switch mechanism Calibration Setup 1 Connect an output device lamp or buzzer to the switch output leads 2 Connect a test vo...

Страница 19: ... 4 Apply 10 differential pressure and adjust the switch plate until the switch actuates Lock the two linkage screws 5 Rotate the index pointer to index number 9 Apply 90 differential pressure and adjust the crank radius until the switch actuates 6 Recheck 10 and 90 set points Adjust the crank radius and the index pointer until both set points are accurate within a 2 tolerance nominal Figure 3 7 Li...

Страница 20: ... switch Changing Switch Set Point Tools Screwdriver 1 8 in hex Allen wrench Definitions of Terms Set Point The measured pressure at which the snap switch actuates and thereby changes the states of the N O and N C contacts For example the set point of the low switch is 24 psid with decreasing pressure Deadband The difference in measured pressures between switch actuation and switch reset Deadband i...

Страница 21: ...ver Do not remove the pointer or scale plate 2 Insert hex wrench in the switch adjust post 3 Loosen the switch lock screw item B 1 2 to 1 turn 4 With the hex wrench move the index pointer item C to the new set point as indicated on the switch index item D 5 If possible check the set point by varying the process pressures and ob serving the pointer readings when the switch actuates Open the mani fo...

Страница 22: ... cause errors 4 Change the switch set point as described in Changing Set Point of an In Service Instruments page 21 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 hold for a few seconds then continue in 1 4 psid steps until the switch actuates If t...

Страница 23: ...ose Tighten pointer Dirty or corroded mechanism Clean or replace Wiring interfering with movement Re route wiring Dirty mechanism Clean mechanism High Indication Indicator AlarmSwitch Mechanism Loose linkage or movement Tighten or replace Out of calibration Calibrate Erratic Indication Indicator Alarm Switch Mechanism Linkage dragging or dirty Adjust or clean Pointer dragging on scale plate Adjust...

Страница 24: ...peres DC inductive loads cause arcing and burning of contacts Consider arc suppression devices or relays Accumulation of fluids in piping generate artificial signal Vent gas or drain liquids from signal lines Calibration Techniques Failure to check set point after locking Verify set point repeatability after locking switch plate Rapid pressure change or venting system During calibration make press...

Страница 25: ...tial Pressure Switch Section 4 Section 4 Assembly Drawing and Parts List LOCATE THE SCALE PLATE UNDER THE MOUNTING TAB WITHOUT A SCREW AT THE 6 O CLOCK POSITION Figure 4 1 Model 580A 0 indicating switch shown with glass lens ...

Страница 26: ...her Spring 9A C0257 0019C 2 9 Lock Screw 9A C0580 1017C 2 10 Screw B H Slotted 3 48 x 3 16 Lg 9A C0117 0007J 6 11 Washer Flat No 3 9A C0003 0045K 11 12 Screw B H Slotted 8 32 x 3 16 Lg 9A C0117 1001J 2 13 Retaining Ring 9A C0087 0015T 2 14 Grip Ring Retaining Included in Items 1 and 2 9A C0087 1055T 2 15 Link Plate 9A C0288 0016C 2 16 Set Screw 6 32 x 1 4 Lg 9A C0320 1010J 1 17 Strap 9A C0288 0017...

Страница 27: ...1J 4 45 Washer Ext Tooth 1 4 9A C0003 0068K 4 46 Plug 9A C0224 0269C 1 47 O ring Torque Tube EPT 9A C0001 1068R 1 48 Ring Grip 9A C0087 1029T 1 49 Washer Split Lock 3 8 9A C0003 0093K 2 50 O ring Header EPT 9A C0001 1066R 1 51 Nut Hex 3 8 16 9A C0500 0039J 2 52 O ring Lens Cover EPT 9A C0001 1057R 1 53 O ring Plug EPT 9A C0001 1051R 1 54 Set Screw Socket Hex 10 32 x 3 8 Lg 9A C0320 0024J 2 55 Scre...

Страница 28: ...28 Section 4 Model 580A Differential Pressure Switch Figure 4 2 Model 580A 2 blind switch without indicator ...

Страница 29: ...rew B H Slotted 8 32 x 3 16 Lg 9A C0117 1001J 2 13 Retaining Ring 9A C0087 0015T 2 14 Grip Ring Retaining Included in Items 1 and 2 9A C0087 1055T 2 15 Link Plate 9A C0288 0016C 2 16 Set Screw 6 32 x 1 4 Lg 9A C0320 1010J 1 17 Strap 9A C0288 0017C 2 18 Washer Flat 9A C0317 0019C 2 19 Set Screw Hex Socket 6 32 x 3 8 Lg 9A C0320 1015J 2 22 Drive Arm Assembly 9A C0580 1076B 1 24 Block Terminal TB1 9A...

Страница 30: ...ew Flat Hd 10 32 x 1 2 Lg 9A C0240 0015J 6 58 Washer Split Lock 8 9A C0003 0036K 2 60 Washer Split Lock 6 9A C0003 0038K 2 72 Case Bushing 9A C0580 1101C 1 Silicone Grease 9A C0002 1003U A R Thread Lubricant Mokykote 9A C0002 0010U A R Locktite 222 9A C0007 1033U A R Notes Prior to installation lubricate O rings Items 47 50 52 and 53 with silicone grease Apply thread lubricant to threads of Item 1...

Страница 31: ... x 1 Lg select one 8 35 45 in lb Model 580A 0 with glass lens Model 580A 2 blind 9A C0220 1062J 9A C0220 1031J 39 Screw Rd Hd Slotted 6 32 x 3 8 Lg 9A C0111 0015J 2 Tight 40 Screw Pan Hd Slotted 4 40 x 1 8 Lg Model 580A 0 only bottom hole in scale plate not used 9A C0119 1116J 5 Snug 41 Screw B H Slotted 4 40 x 3 16 Lg Model 580A 0 only 9A C0117 0012J 1 Tight 42 Screw B H Slotted 6 32 x 3 16 Lg Mo...

Страница 32: ...32 Section 4 Model 580A Differential Pressure Switch ...

Страница 33: ... 3 7 8 98 4 3 4 19 1 1 2 12 7 D A CASE DPU Figure 5 1 Model 580A side view CENTER OF GRAVITY LOW PRESSURE HOUSING 4 SLOTS 3 8 9 5 X 11 16 17 5 BOTTOM PRESSURE CONNECTIONS 1 4 NPT STANDARD PRESSURE HOUSING HIGH PRESSURE HOUSING TOP PRESSURE CONNECTIONS 1 2 NPT STANDARD 3 1 2 88 9 2 13 16 71 4 1 13 32 35 7 2 5 16 58 7 DPU B C E Figure 5 2 Model 580A rear view ...

Страница 34: ...DIM A 580A 0 DIM A 580A 2 DIM B DIM C DIM D DIM E 5 1 5K 7 5 16 185 7 6 3 4 171 4 6 15 16 176 2 5 5 8 142 9 5 1 16 128 67 2 15 16 74 6 3 6K 7 5 16 185 7 6 3 4 171 4 7 5 16 185 7 6 152 4 5 3 16 131 8 3 1 4 82 6 IMPORTANT For DPU dimensional information refer to DPU Dimensional Drawing page A 19 ...

Страница 35: ...gs 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 transm...

Страница 36: ...tside 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 ...

Страница 37: ... 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 x 1 4 NPT bot...

Страница 38: ...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 t...

Страница 39: ...rn lines with DPU piping lines Observe the following standard practices and refer to the piping diagrams on page A 6 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 limi...

Страница 40: ...tial pressure to facilitate operation and checking of the DPU Install shutoff and bypass valves so they are 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 are presented on the fol lowing pages Use the diagram best suited for the application as a guide for piping configuration ...

Страница 41: ...e A 5 Gas Flow Hydrates Present DPU PLUGS BLOCK VALVES CONDENSING RESERVOIR PRIMARY DEVICE SHUT OFF VALVES VENT VALVES OPTIONAL Figure A 6 Steam Flow DPU Below Run BLOCK VALVES PRIMARY DEVICE DRIP POTS STATIC PRESSURE CONNECTION USE ONLY ONE BYPASS VALVES VENT VALVE SHUT OFF VALVES DPU Figure A 7 Liquid Flow DPU Above Run ...

Страница 42: ...ASSY LIQUIDS SHUT OFF VALVES DPU Figure A 8 Liquid Flow DPU Below Run BLOCK VALVES SEAL POTS PRIMARY DEVICE BYPASS VALVE SHUT OFF VALVES DPU Figure A 9 Corrosive Liquid Flow DRAIN VALVE BLOCK VALVE HIGH PRESSURE DPU BLOCK VALVE SHUT OFF VALVE VENT VALVE SHUT OFF VALVE Figure A 10 Cool Non Condensing Liquid DPU Level with Tank Bottom ...

Страница 43: ...BLOCK VALVE DRAIN VALVE DPU SHUT OFF VALVE BLOCK VALVE Figure A 11 Cool Non Condensing Liquid DPU Below Tank HIGH PRESSURE SHUT OFF VALVE REFERENCE LEG 2 CROSS BYPASS VALVE VENT VALVE BLOCK VALVE BLOCK VALVE DPU SHUT OFF VALVE DRAIN VALVE Figure A 12 DPU Bottom Tank with Reference Leg ...

Страница 44: ...LENGTH 6 INCHES DPU BLOCK VALVE VAPOR GENERATOR Figure A 13 Liquid CO2 LOW PRESSURE HIGH PRESSURE SHUT OFF VALVE INVERTED U GAS TRAP VAPOR GENERATOR FLAT TUBULAR SPIRAL IN OUTER 1 3 OF TANK INSULATION KEEP DEAD LEG BETWEEN TANK AND SPIRAL 5 INCHES OR LESS MINIMUM LENGTH 12 INCHES BLOCK VALVE BLOCK VALVE DPU Figure A 14 Cryogenic Liquids ...

Страница 45: ... VALVES HIGH PRESSURE GAS SUPPLY SIGHT FLOW GAGE BYPASS VALVE DPU INPUT GAS REGULATOR Figure A 15 Bubbler System SHUT OFF VALVES BLOCK VALVES HIGH PRESSURE GAS SUPPLY INPUT GAS REGULATOR SIGHT FLOW GAGES WITH THROTTLING VALVES BYPASS VALVE DPU Figure A 16 Liquid Specific Gravity ...

Страница 46: ...occur 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 th...

Страница 47: ...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 c...

Страница 48: ...he DPU replace the BUA with a unit of the desired range Replacing the Bellows Unit Assembly BUA WARNING Review the warnings under DPU Cleaning and Inspection page A 13 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 t...

Страница 49: ...e instructions in Section 3 page 11 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 1 page 23 for Model 580A Differential Pressure Switch trouble shooting information Table A 3 Troubleshooting Tips Problem Possible Source Probable Cause Corrective Acti...

Страница 50: ...ry Element to 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 Primary Element to DPU piping Liqui...

Страница 51: ...A 17 Model 580A Differential Pressure Switch Appendix A DPU Assembly Drawing and Parts List Figure A 17 Model 224 DPU assembly drawing ...

Страница 52: ...g 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 ...

Страница 53: ... 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 ...

Страница 54: ...A 20 Appendix A Model 580A Differential Pressure Switch ...

Страница 55: ...LUDES 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 incid...

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