WESTLOCK spare parts valve position transmitter

Chinese name: Valve position controller English name: Valve position controller can be used with various regulating valves to display the upper and lower limits of the regulating valve stroke. If used in conjunction with a regulating system or accident protection system, it can achieve mutual interlocking of valves in the regulating system. In the event of an accident, the stroke position of the regulating valve can be displayed. Therefore, the valve position controller is a valve position signaling device that drives the micro switch of the controller by adjusting the stroke change of the valve and outputs an electrical signal.

WESTLOCK spare parts valve position transmitter

WESTLOCK spare parts valve position transmitter

principle

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The valve controller consists of analog circuits, including the main steam valve (MSV), high-pressure regulating valve (GV), and medium pressure regulating valve (IV) controllers. The valve controller adjusts the valve opening according to the valve opening instruction given by the main controller, so that the valve opening corresponds to the valve being in a smaller position; The milliampere current signal output is converted into an oil pressure signal through an electro-hydraulic converter before being used to operate the valve. The feedback signal of the valve position is sent back to the valve controller through a position transmitter (LVDT) for deviation comparison with the input valve position command signal. [1]

Structure and Application

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The valve position controller is an auxiliary instrument of the actuator, used in conjunction with various pneumatic control valves to display the upper and lower working positions of the control valve. If applied in conjunction with a regulating system or accident protection system, it can achieve mutual interlocking between valves and other devices in the regulating system, and display the upper or lower limit position of the on-site regulating valve in case of an accident. Explosion proof grade d Ⅱ BT4, widely used in important regulating circuits in automatic control systems, is a supporting instrument in industrial sectors such as petroleum, chemical, metallurgy, power plants, and textiles.

effect

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The valve position controller can be used in conjunction with various regulating valves to display the upper and lower limits of the regulating valve stroke. If used in conjunction with a control system or accident protection system, it can achieve mutual interlocking of valves in the control system; In the event of an accident, the stroke position of the regulating valve can be displayed. Therefore, the valve position controller is a valve position signaling device that drives the micro switch of the controller by adjusting the stroke change of the valve and outputs an electrical signal. [2]

Main technical indicators

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Travel range: equipped with a regulating valve with a travel of 10-60mm.

(Corner 30-90 º)

Environmental temperature: General type: -25~55 ℃

Explosion proof type: -25~40 ℃

Relative humidity: 5-100%

Output contacts: upper limit - one pair of normally closed and one pair of normally open

Lower limit - one pair of normally closed and one pair of normally open

The working voltage and rated current are specified in the table:

Current category (DC/AC)

Rated current A

Working voltage V

Direct Current (DC)

1

30

Communication (AC)

1

250

Lifespan: Electrical lifespan not less than 30000 cycles

Electrical connection: G/2 'cylindrical pipe thread, can be equipped with ANG series explosion-proof flexible connection pipe and FNG series dustproof flexible connection pipe.

Weight: Approximately 1.5 kg

Precautions

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a. Before using the valve position controller, it is necessary to check the working voltage, load current, and explosion-proof requirements of the electrical components to see if they meet the requirements.

b. Check the installation position, structure, wire connection, and explosion-proof performance of the valve position controller.

c. The product has been adjusted before leaving the factory, with an upper limit sending position of 100% ± 2.5% and a lower limit sending position of 0% ± 2.5%. If any deviation is found, adjust the cam of the controller and tighten it after adjustment. Various forms of valve position display can be achieved by changing the wiring method and adjusting the cam position according to the actual needs of the regulating valve.

d. If it is an explosion-proof structure, it is not allowed to be electrically adjusted on the valve site. [3]

maintenance and repair

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Instrument diagram

1) The connection components of the valve position controller are prone to loosening and must be checked and tightened regularly.

2) Lubricating oil should be regularly added to moving parts such as shafts to prevent wear and tear.

3) Explosion proof structures require regular inspection of the meter cover, cable joints, and explosion-proof joint surfaces.

4) Regularly check the contact conversion of the micro switch, and replace any damaged or insensitive ones.

5) When repairing explosion-proof valve body controllers, attention should be paid to safety and the protective gear should not be damaged

WESTLOCK2647ABYB1S00022FANIR1Valve position feedback transmitter

WESTLOCK266000S00002BJF00Valve position feedback switch

WESTLOCK2647ABYS0CS22FAN-AR2

WESTLOCK2647ABYS00022FAN-AR2

WESTLOOK3349ABYN0CS2FAN-AR1

WESTLOCK3349ABYN0CS22FAN-AR1

WESTLOCK2649ABYN00022AAA-AR2Valve position controller

WESTERMO3643-0105 L210-F2G

WESTERMO3643-0230 L106-F2G

WESTERMO3645-0050 MCW-211-MM-LC2

WESTERMO3643-0235 L206-F2G

WESTCODER500CH28 1000A

WESTERMOL110-F2G

WESTERMOSDW-541-MM-LC2

WESTLOCK3347ABYN00022AAA-AR1

WESTLOCK2649ABYN00022FAN-AR2

WESTERMOMD-21 DC

WESTERMOMDW-45 LV 3617-0001Signal Converter

WESTLOCK316SBSRN020AAAB115

WESTLOCK2649AB7N00022FAN-NR2

WESTLOCK2646ABYN00022FAN-AR2switch

WESTLOCK2649ABYN0CS22AAA-AR2switch

WESTLOCK3049ABYN00022FAN-AR1

WESTLOCKD510RO-BFPST-01

WEST8100 2110-1020Temperature Controller

WESTLOCK3349RBYN-GCHTV-01

WESTLOCK3347ABYN00033FAN-AR1

WESTLOCK3347ABYN00033BFP-00

WESTLOCK2245ABYN0CS42AAA-AR1

WESTERMOMD-12 DC 3150-1001

WESTERMO3150-1001, MD-12 DC

WESTLOCK2245ABYN00022AAA-AR1

WESTLOCK2249ABYN00022AAA-AR3 replacementlimit switch

WESTLOCK2645ABYN0CS22AAA-AR2

WESTLOCKWD-100102UK

WESTLOCKEL-020602UK

WESTLOCK2649SBYN0CS22FAN-AR2

WESTLOCKVA-111204UK is applicable for this quantity

WESTLOCK3345ABYN00022FAN-AR1

WESTLOCK3347ABYN0CS22FAN-AR1

WESTLOCK2649ABYN00022FAN-AR2Valve transmitter

WESTLOCK3F080

WESTLOCKEL-30264 REVJvalve position transmitter

WESTLOCK2007SBY2B2M0200

WESTLOCK2645ABYS00022ADZ-NR2

WESTLOCK3045ABYN00022ADZ-NR1

WESTLOCK316SB-DTN-004-AAA is valid for the entire order

WESTLOCK2649SBYN00042AAA-AR2

WESTLOCK2649SBYS00042BNX-AR2

WESTLOCK2649SBYN00022AAA-AR2

WESTLOCK3249ABYN00022AAA-0R1

WESTLOCK2649ABYN00022AAA-AR2

WESTLOCK3347ABYN0DS23FAN-AR1

WESTLOCK2647SBYN00022AAA-AR2

WESTLOCKD281NT0000BYEX3locator

WESTLOCK2645ABYS00022ADZ-NR2

WESTPAM-193-Prelay

WESTLOCK2649ABYN00022FANAR2Feedback device

WESTLOCK2645ABYS00022ADZ-NR2

WESTLOCK3347ABYS00022FAN-NR1

WESTLOCK3345ABYS00022FAN-NR1

WESTLOCK2645ABYS00022ADZ-NR2

WESTLOCK316SB-STN-020-AAA

WESTLOCK2649ABYN00022FAN-AR2

WESTPAM-199-P, VERSION 2230Amplifier module

WESTLOCKDiscontinued production, new model: 2249AGRS00022AAA-AR3

WESTLOCK3449-RG-IEC-RFS1

WESTLOCK2245ABYN0CS42XAI-AR3Valve position feedback device

WESTLOCK2649ABYN00022ADZ-AR2

WESTLOCK2007SBY2B2M04DS (upgraded model)

WESTLOCK2247ABYN00042CJK-AR1

WESTLOCK2247ABYNSGT2

WESTLOCK2245ABYN00022FAN-AR1

WESTLOCK3347ABYN00022FAN-AR1

WESTLOCK2245ABYNOO22FAV

WESTLOCK2646ABYN00022AAA-AR2

WESTLOCK2004SFC2A2M0200

WESTLOCK2004SFC2A2M0200

WESTLOCK2646SBYN00022AAA-AR2

WESTLOCK3347RBYN00022FAN-AR1

WESTLOCK2649ABYS00022AAA-AR2

WESTLOCK3347ABYN00022FAN-AR1

WESTLOCK3347ABYN0CS22FAN-AR1

WESTLOCKRMJ-11-177-20G21valve positioner

WESTLOCK3347ABYN-SPSTC-01

WESTLOCK2646SBYN00022AAA-AR1 discontinued, replaced by 2646SBYN00022AAA-AR2limit switch

WESTLOCK3347ABYN00022FAN-AR1 (with information available)

WESTLOCK5337-GZ-01-11-67valve positioner

WESTLOCK2007X-BY-E183 alternative model: 2007SBY2B2M04DS (with information available)

WESTLOCK3347ABYN00043AA-AR1 replacementlimit switch

WESTLOCK3347ABYN00022AAA-AR1 replacementlimit switch

WESTLOCK2649ABYN00042FAN-AR2

WESTLOCK3347ABYN00022FANB145

WESTLOCK3347ABYN00022FAN-AR1

WESTLOCK34792B2M0600X5V30 替代

WESTLOCKD281NT2M09BYEX2locator

WESTLOCK3347ABYN00022FAN-AR1Feedback switch

WESTLOCKRMJ-11-177-20G21

WESTLOCK316LT-STN-004-AAA

WESTLOCKD281NT4M08BYEX3 replacement

WESTLOCK2649ABYS00022AAA-AR2

WESTLOCK2649ABYN00022ADZ-AR2

WESTLOCK2649ABYN00042FAN-AR2

WESTLOCK316LT-STN-004-AAA-N

WESTLOCK316LT-STN-004-AAA

WESTLOCK2649ABYN00022AAA-AR2

WESTLOCK2649SB7N00022FAN-AR2

SIBA

2021113.2

WESTLOCKD241NT2M08BYIR3

WESTLOCK3347ABYN00042FAN-AR1

WESTLOCK3347ABYN00043FAN-AR1

WESTLOCK316SB-DTM-020-AAA

WESTLOCK2245ABYSOCS42AAA-IR1

WESTLOCK2245ABYS0DS44AAA-AR3

WESTLOCK2649ABYN-CCLYE-01

WESTLOCK2649ABYN00022FAN-AR2

WESTLOCK2649ABYN00022FAN-AR2

WESTLOCK3047ABYN-GCIMJC-05

WESTLOCK3047ABYN-GCIMJC-05

WESTLOCK2649ABYN00022AAA-AR2 is valid for the entire order

WESTLOCK3347ABYN00022AAA-AR1

WESTLOCK2649ABYN-GCRXTV-01

WESTLOCKEL-30264

WESTLOCK3349ABYN00022FAN-AR1

WESTLOCK3360R00N0CS02AAA-AR1

WESTLOCK3360R00N0CS02AAA-AR1

WESTLOCKD420RO0

WESTLOCKD420RO0

WESTLOCK2347ABYNOCS42FAN-IR1

WESTLOCK3347ABYN00022FAN-AR1 replacement

WESTLOCK2649ABYN00022FANAR2

WESTLOCK2645ABYN0CS22FAN-AR2 is valid for the entire order

WESTLOCKEL-020602UK

WESTLOCK2645ABYN00022AAA-AR2

WESTLOCK2004NBY2A2M0400

WESTLOCK2649ABYN00022FAN-AR2

WESTLOCK2649ABYN00022FAN-AR2

WESTLOCKXT-90/SW10000-L08 is valid for the entire order

WESTLOCK2649ABYN00022AAA-AR2

WESTLOCK2649ABYN00022FAN-AR2

WESTLOCK2649ABYN00022FAN-AR2

WESTLOCK2645ABYN-CNZJV-02

WESTLOCK2645ABYNOCS12FAN-AR

WESTLOCK2645ABYN0CS22FAN-AR2

WESTLOCK2645ABYN00022AAA-AR2

WESTLOCK3449RBYN-DOW50000-R1

WESTLOCKThis is an ancient code, now available as 2004NBY2A2M0400

WESTLOCK3347ABYN00022FAN-AR1

WESTLOCKEL-30264 REV J

WESTLOCK2246ABYN00042AAA-AR1

WESTLOCK2265A00S00022AAA-AR3

WESTLOCK2007XBP1N

WESTLOCKD410R01

WESTLOCK3249ABYN00022AAAB117

WESTL0CKEL-30264 REV J

WESTLOCKEL-30264 REV J

WESTLOCKEL-020602 UK

WESTLOCKEL-30264 REV J

Westphalia0005-1646-100 PCF1270

WESTLOCKD261NT0000BYRX3

WESTLOCKD241NT0000BYNS2

WESTLCOK2649ABYN00022ADZ-AR2

WESTLOCK3360R00N0DS02AAA-AR1

WESTLCOK2246ABYN00042AAA-AR1

WESTLCOK2649ABYN000- 22FAN-AR2

WESTLOCKSTK3001985 - 2004NBY2A2M0200U

WESTLOCKSTK3001985 - 2004NBY2A2M0200U

WESTLCOK2245ABYN00022AAA-AR1

WESTLOCK2246ABYN00042AAA-AR1

WESTLCOK2649ABYN000- 22FAN-AR2

WESTERMO3151-2001 MD-21 DC

WESTLOCK2245ABYN00042ADZ-AR3

WESTLOCK2645ABYN00022ADZ-AR2

WESTLOCK2649ABYN00022ADZ-AR2

WESTLOCK2649ABYN00022ADZ-AR2

WESTLOCKD420RO0

WESTLOCKDiscontinued production, providing EL-30264 REV J does not affect technical functionality

WESTLOCKThe original model 3347ABYN00042FAN-AR1 has been discontinued

WESTLOCKD420ROA2000000-1

WESTLOCKDiscontinued successor 2649ABYK00022ADZ-AR2

WESTP6100-211110230

WESTERMOMDW-45 SERIES RS232-485

WESTERMO3617-0001 MDW-45 LV

WESTLOCK3347ABYN00022FAN-ARI

WESTLOCKKS-027GELATEX

WESTLOCK2649ABYS00022AAA-AR2

WESTLOCK2649ABYS0CS22AAA-AR2

WESTCODELV4D3TR6-A I33

WESTCODELV4D3TL6-A I33

WESTN2300-0111

WESTP8100-37710020-10

WESTLOCK3049ABYN00022FANB142

WESTLOCK2649ABYN00022AAA-AR2

WESTLOCKEquivalent to the old model 2649ABYN0CS22AAA-AR2

WESTLOCK2004SFC2A2M0200

WESTLOOKD281NT2M09BYEX2

WESTLOCKD281NT2M09BYEX2

WESTLOCKD281NT2M09BYEX2

WESTLOCKD281NT2M09BYRX2

WESTLOOKD281NT2M09BYEX2

WESTLOCKD281NT2M09BYEX2

WESTLOCKBR30017-002

WESTLOCKBR30017-002

WESTLOCKD281NT 2M09BYEX2

WESTLOCK3345RBYN00042FAN-AR1

WESTLOCKBZA1-5127-2IP65

WESTLOCKEquivalent to the old model 2649ABYN0CS22AAA-AR2

WESTLOCK2649ABYN00022FAN-AR2

WESTLOCK2649ABYN00022ADZ-AR2

WESTLOCK2645ABYN00022AAA-AR2/B754FW

WESTLOCK2645ABYN-CNZJV-02

WESTLOCK2645ABYN0CS22FAN-AR2

WESTLOCK2645ABYN00022AAA-AR2

WESTLOCK2645ABYNOCS12FAN-AR2

WESTLOCK2249ABYN00024EIS-NR3

WESTLOCK3347ABYS00022FAN-AR1

WESTLOCK3349RBYN-GCXLE-01

WESTLOCK2649ABYN-CCLYE-01

WESTCORMP1-78661

WESTLOCK2246ABYN00042AAA

WESTLOCK2649ABYN00022FAN-AR2

WESTLOCK2247ABYNOCS22AAA-AR1

WESTLOCKEL-30264 is only the transmitter part, as it does not include a bracket or gear

WESTLOCK3349ABYN00022FAN-AR1 replacement

WESTLOCK2645ABYN00022AAA-AR2

WESTLOCK2649ABYN00022AAA-AR2

WESTLOCK5330NIEHBA2AN

WESTLOCKDiscontinue production of 2247ABYN00022EMI-AR3

WESTLOCK2247-BY-N-000-12WAH-00(C)

WESTMLC80H-50-01-02

WESTERMO3153-3001

WESTLOCK2649ABYN00022AAA-AR2

WESTLOCK3360R00N0CS02AAA-AR1

GEA WESTFALIA SEPARATOR0018-5947-820

GEA WESTFALIA SEPARATOR0018-6654-010

GEA WESTFALIA SEPARATOR0018-7614-930

GEA WESTFALIA SEPARATOR0018-6654-040

GEA WESTFALIA SEPARATOR0021-3293-870

GEA WESTFALIA SEPARATOR0021-3345-900

GEA WESTFALIA SEPARATOR0018-5947-820

GEA WESTFALIA SEPARATOR0018-6654-010

GEA WESTFALIA SEPARATOR0018-7614-930

GEA WESTFALIA SEPARATOR0018-6654-040

GEA WESTFALIA SEPARATOR0021-3293-870

GEA WESTFALIA SEPARATOR0021-3345-900

WesternSDI-550

SOUTHWESTMS16

SOUTHWEST300B

SOUTHWEST310B

WESTLOCK2649ABYN00022FAN-AR2

WESTLOCKDiscontinue production of new part numbers for products with the same specifications as 2007SBY2B2M04CS.

WESTLOCK3349ABYN0CS22FAN-AR1

WESTLOCK3349ABYN0CS22FAN-AR1

WESTLOCKDiscontinue production of new part numbers for products with the same specifications as 2007SBY2B2M04CS.

WESTLOCKDiscontinued production of 2004NBY2A2M0400

WESTLOCK2004SBY2A2M0200

WESTLOCK3047RBYN00022AAA-AR1

WESTCYB-XSE8 1203094

WESTERMO3617-0001 MDW-45 LV

WESTERMOMDW-45 LV 3617-0001

WESTLOCKD441-RO-1-1-000000-1

WESTLOCK2007SBY2B2M04CS

WESTLOCK316SB-STN-020-AAA

WESTLOCK2245ABYSOCS42AAA-IR1

WESTLOCK2245ABYS0DS44AAA-AR3

WESTLOCKEL-30264 REV J

WESTLOCKEL-30264 REV J

WESTLOCK2649ABYN00022FAN-AR2

WESTLOCKD420-RO-A-3-000000-1

WESTLOCKEL-30264 REV J

WESTLOCK2649ABYN00022FAN-NR2

WESTLOCK2645ABYN0CS23FAN-AR2

WESTLOCK2645ABYN00022AAA-AR2

WESTLOCK2645ABYN0CS22FAN-AR2+EL-020602UK

WESTLOCK2645ABYN0CS12FAN-AR2

WESTLOCK2645ABYN00022AAA-AR2

WEST21100020 S160 P8100 743279 020 039

WESTLOCK2246ABYN00042AAA

WESTTEMUEWA P4100-21011020-10

WESTP4100-21011020-10

WESTERMO3641-4300 RFI-219-F4G-T7G

WESTLOCK9479SBY2B2M1200

WESTLOCK2007SBY2B4M0200

WESTLOCK9479SBY2B4M0600

WESTLOCK2007SBY2B2M0200

WESTLOCKXT-90

WESTLOCK9479SBY2B4M0600

WESTLOCK3349RBYN-GCXLE-01

WESTLOCK2245ABYN0CS42XAI-AR1

WESTLOCK316SB-STN-004-AAA

WESTLOCKIf ordering EL-30264 REV J, please send the serial number of the unit where you intend to install the parts.

WESTLOCKXT-90

WESTLOCKC3479-NO-W300

WESTPAM-199-P

WESTLOCKEL-30264 REV J

WESTLOCKEL-30264 REV J

WESTLOCK2649ABYN0CS22FAN-AR2

WESTLOCK2649ABYS00022AAA-AR2

WESTLOCK3347ABYN0CS22FAN-AR1

WESTLOCKB-EL-30264

WESTLOCKEL-30264 REV J

WESTLOCKEL-30264 REV J

WESTLOCK2649ABYN00022FAN-AR2

WESTLOCK2249ABYN0CS22AAA-AR1

WESTLOCK316SB-STN-004-AAA

WESTLOCKEquivalent to the old model 2649ABYN0CS22AAA-AR2

WESTLOCK2245ABYN0CS42XAI-AR1

WESTLOCK2245ABYN0CS42XAI-AR1

WESTLOCK2649ABYN-GCRXTV-01

WESTLOCKKS-027-GE-L

WESTLOCK2649ABYN00022AAA-AR2

WESTLOCK2645ABYN00022ADZ-AR2

WESTLOCKC3479-NO-W300 updated part number 34793B2M06

WESTERMO3642-0300 DDW-142

WESTERMOL110-F2G

WESTERMOSLC20

WESTERMOL110-F2G

WESTERMOGSLC30-LHX

WESTLOCKD261NT0000BYEX3 replacement

WESTLOCKEquivalent to the old model 2649ABYN0CS22AAA-AR2

WESTLOCK3345ABYN0DS22FAN-AR1 (with information available)

WESTLOCKD281ST2M04BYRX3

WESTLOCK2649ABYN00022AAA-AR2

WESTONEPX15/WWAAA/WFS/WF/WF/0014

WESTLOCKD241NT0000FCNS2

WESTLOCK2245ABYS0CS42AAA-IR3

WESTLOCK2245ABYS0DS44AAA-AR3

WESTLOCK2245ABYS0DS44AAA-AR3

WESTLOCK2245ABYSOCS42AAA-IR1

WESTLOCK3349-ABYN-000-22-FAN-AR1

WESTLOCK2245ABYN0CS42XAI-AR3

WESTLOCK9479SBY2B2M060000710

WESTLOCK2649ABYN00022AAA-AR2

WESTLOCK2245ABYS0DS44AAA-AR3

WESTLOCKD261ST2M06BYEX3 replacement

WESTLOCK2649SBYS00022ADZ-AR2

WESTCODEDiscontinue production to replace R1275NC20M

WESTLOCKEL-30264 RE J

WESTLOCKEL-30264 REV-H

WESTLOCKD261NT2M06BYEX2 replacement

WESTLOCKD241NT2M08BYNS3 replacement

WESTLOCKEquivalent to the old model 2649ABYN0CS22AAA-AR2

WESTLOCK2649AB7N00022FAN-AR2

WESTP4100-2-1-1-1-0-0-2-0-(1-0)

WESTLOCK2649ABYN00022FAN-AR2

WESTLOCKD410RO-BFTRM-01

WESTLOCK2007SBY2B2M0400

Westlock2007SBY2B2M0400

WESTLOOK2007SBY2B2M08CS-Y

WESTLOCK2645ABYN00022FAN-AR2

WESTLOCK2645ABYN00022FAN-AR2

WESTLOCK3545RBYN00022AAA-0R1 replacement

WESTLOCK2645ABYN-CCYYE-01

WESTLOCK2649SBYN00022FAN-AR2

WESTERNBLH-S5-4/15

WESTLOCK2649SB1N0CS22FAN-AR2

WESTLOCK2649SBYN00022FAN-AR2

WESTLOCK2645SBYN0CS22FAN-AR2

WESTLOCK2645ABYS00022AAA-AR2

WESTLOCK2645ABYS00022AAA-AR2

WESTLOCK2647AB1S00022FAN-AR2

WESTLOCK266000S00002BJF00

WESTLOCK1500

There are many factors that affect the accuracy of transmitters in circuits, mainly including the following.

(1) The influence of nonlinear components. Conventional voltage and current transmitters are mostly AC converters (small transformers), where the secondary AC signal is rectified, filtered, and stabilized to obtain the final DC signal. Due to the fact that rectifier diodes are nonlinear devices, their voltage and current curves exhibit nonlinear characteristics.

(2) The influence of transmitter iron core: In conventional transmitter transformation, iron core material is used as the magnetic medium. On the one hand, due to the nonlinear characteristics exhibited by ferromagnetic materials (the starting and saturation regions of magnetization lines), it is not an ideal linear transmission relationship, which will inevitably affect the accuracy of the transmitter. On the other hand, due to the hysteresis of ferromagnetic materials, the iron core also affects the accuracy of the transmitter. Generally, within the power frequency range, the hysteresis angle of conventional silicon steel sheets varies from 0 ° to 15 °, and the existence of this hysteresis angle is equivalent to increasing the reactive power component. Since conventional power transmitters calculate power by multiplying voltage and current signals, this hysteresis angle will also affect the accuracy of the power transmitter.

(3) The impact of operational amplifiers: Conventional power transmitters are mostly composed of operational amplifiers, and temperature has a significant impact on the operation of operational amplifiers. Temperature changes and "zero" point drift make the operating point unstable, directly affecting the accuracy and reliability of the transmitter.

(4) The selection of transmitter setting values affects the transmitter. Although the setting values of the transmitter are selected as close as possible to the full value, in actual use, the transmitter often cannot operate in the linear region, resulting in errors.

(5) Error impact caused by impedance mismatch

(6) The impact of system imbalance on the power calculation of conventional transmitters is generally assumed to be balanced, but in reality, the system is unbalanced, and this imbalance often affects the accuracy of the transmitter. [5]

Function Function

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The function of a transmitter is to detect process parameters and transmit the measured values in a specific signal form for display and adjustment. [6]

The function of automatic detection and regulation system is to convert various process parameters such as temperature, pressure, flow rate, liquid level, composition and other physical quantities into a unified standard signal, and then transmit it to the regulator and indicator recorder for adjustment, indication and recording. [7]

Selection Attention

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The selection of transmitters is usually considered based on installation conditions, environmental conditions, instrument performance, economy, and application media. In practical application, it is divided into direct measurement and indirect measurement; Its uses include process measurement, process control, and device interlocking. Common transmitters include ordinary pressure transmitters, differential pressure transmitters, single flange transmitters, double flange transmitters, plug-in flange transmitters, etc.

Pressure transmitters and differential pressure transmitters measure pressure and the difference between two pressures, but they indirectly measure many parameters. Like a pressure transmitter, in addition to measuring pressure, it can also measure the liquid level inside the equipment. When measuring liquid level in atmospheric pressure vessels, a pressure transformer is required. When measuring the liquid level of a pressurized container, two pressure transformers can be used, namely one for measuring the lower limit and one for measuring the upper limit. Their output signals can be subtracted to measure the liquid level, and differential pressure transmitters are generally used. It can also be used to measure the density of a medium while keeping the liquid level and pressure values constant inside the container. The measurement range of pressure transmitters can be very wide, starting from zero absolute pressure and up to 100MPa (in general). [5]

Common Faults

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Transmitter (Figure 7)

1. During installation, the axial direction of the pressure sensitive part of the transmitter shall be perpendicular to the gravity direction. If the installation conditions are limited, the zero position of the transmitter shall be adjusted to the standard value after installation and fixation.

2. The remaining pressure cannot be released, so the sensor zero position cannot be lowered. The best way to eliminate this cause is to remove the sensor and directly check if the zero position is normal. If it is normal, replace the sealing ring and try again.

3. The output of the pressure transmitter does not change, and if the output of the pressure transmitter suddenly changes, the zero position of the pressure relief transmitter cannot return. The most likely cause of this phenomenon is the sealing ring of the pressure sensor.

4. Whether it meets the power supply requirements; Is there any wiring error between the power supply, transmitter, and load equipment. If there is no voltage or the polarity is reversed on the wiring terminals of the transmitter, it can cause the transmitter to output no voltage signal.

5. The casing of pressure sensors and transmitters generally needs to be grounded, and signal cables should not be mixed with power cables. Strong electromagnetic interference should be avoided around sensors and transmitters. Sensors and transmitters should be periodically calibrated according to industry regulations during use.

6. When selecting pressure sensors and transmitters, users should fully understand the working conditions of the pressure measurement system, make reasonable choices according to their needs, so that the system can work in the best state and reduce project costs.

7. Transfer the filling liquid inside the isolation sheet and component to both sides of the measuring membrane. Measure the electrodes on both sides of the diaphragm and insulating film to form a capacitor.

8. The pressure transmitter is required to be inspected once a week and once a month, mainly to remove dust from the instrument, carefully check the electrical components, and regularly calibrate the output current value. The pressure transmitter has weak electricity inside and must be isolated from external strong electricity.

development direction

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edit

No matter how conventional transmitters improve accuracy, they still cannot overcome their inherent working characteristics, and errors are inevitable. The rapid development of computer technology provides broad prospects for the research and production of high-performance transmitters. The single-chip AC sampling transmitter has high cost-effectiveness, high accuracy, stable and reliable operation, and does not require frequent calibration.

The single-chip AC sampling transmitter has the following characteristics.

(1) Sampling period and timing

1) In the case where the high-order harmonic components are not large in the power grid, the sampling period can be selected as low rate methods such as 8 times and 12 times, which have lower requirements for microcontrollers and their equipment and are also simple for data processing; If the high-order harmonic components in the power grid are large, it is necessary to increase the sampling rate.

2) The timing of sampling, especially in low rate sampling methods, if the sampling timing happens to be at the peak valley point of high-order harmonics, it will have a significant impact on accuracy. Therefore, within the allowable range of devices and technology, the sampling frequency should be increased as much as possible to suppress the interference impact in the power grid.

(2) The single-chip AC sampling transmitter for iron core nonlinear compensation can achieve segmented nonlinear compensation of the iron core. According to the accuracy requirements and the characteristics of the iron core itself, there is a corresponding compensation curve for each iron core, and segmented compensation can be achieved.

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Valve positioners can be divided into pneumatic valve positioners, electric pneumatic valve positioners, and intelligent valve positioners according to their structural form and working principle.

Valve positioner can increase the output power of the regulating valve, reduce the occurrence of signal transmission delay, accelerate the movement speed of the valve stem, improve the linearity of the valve, overcome the friction force of the valve stem and eliminate the influence of unbalanced force, thereby ensuring the correct positioning of the regulating valve.

Positioner classification

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Valve positioners are divided into pneumatic valve positioners, electric pneumatic valve positioners, and intelligent valve positioners based on input signals. The input signal of the pneumatic valve positioner is a standard gas signal, for example, a 20~100kPa gas signal, and its output signal is also a standard gas signal. The input signal of the electric valve positioner is a standard current or voltage signal, such as a 4-20mA current signal or a 1-5V voltage signal. The electrical signal is converted into electromagnetic force inside the electric valve positioner, and then the gas signal is output to the toggle control valve. The intelligent electrical valve locator converts the current signal output from the control room into a gas signal that drives the regulating valve. Based on the frictional force of the valve stem during the operation of the regulating valve, it offsets the unbalanced force caused by pressure fluctuations in the medium, making the valve opening correspond to the current signal output from the control room. It can also intelligently configure and set corresponding parameters to improve the performance of the control valve.

According to the direction of action, it can be divided into one-way valve positioners and two-way valve positioners. When a one-way valve positioner is used for a piston actuator, the valve positioner only works in one direction, while a two-way valve positioner acts on both sides of the cylinder of the piston actuator from two directions.

According to the gain symbols of the output and input signals of valve positioners, they are divided into positive acting valve positioners and reverse acting valve positioners. When the input signal of the positive action valve positioner increases, the output signal also increases, so the gain is positive. When the input signal of the reaction valve positioner increases, the output signal decreases, resulting in a negative gain.

According to whether the input signal of the valve positioner is an analog signal or a digital signal, it can be divided into ordinary valve positioners and fieldbus electrical valve positioners. The input signal of a regular valve positioner is an analog air pressure, current, or voltage signal, while the input signal of a fieldbus electrical valve positioner is a digital signal of the fieldbus.

According to whether the valve positioner is equipped with a CPU, it can be divided into ordinary electrical valve positioners and intelligent electrical valve positioners. Ordinary electrical valve positioners do not have a CPU, therefore they do not have intelligence and cannot handle related intelligent calculations. The intelligent electrical valve locator is equipped with a CPU, which can handle intelligent operations such as non-linear compensation for forward channels. The fieldbus electrical valve locator can also be equipped with functional modules such as PID to achieve corresponding operations.

The detection method based on feedback signals can also be classified.

valve positioner

For example, valve positioners that use mechanical linkages to detect valve position signals; Valve positioner for detecting valve stem displacement using Hall effect displacement detection method; Valve positioners that use electromagnetic induction methods to detect valve stem displacement.

working principle

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Valve positioner is the main accessory for controlling valves It takes the displacement signal of the valve stem as the feedback measurement signal and the output signal of the controller as the set signal for comparison. When there is a deviation between the two, it changes the output signal to the actuator to make the actuator move, establishing a one-to-one correspondence between the displacement of the valve stem and the output signal of the controller. Therefore, the valve positioner consists of a feedback control system with valve stem displacement as the measurement signal and controller output as the set signal. The manipulated variable of this control system is the output signal from the valve positioner to the actuator.

定位器作用原理

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(1) Used for important regulating systems with high quality requirements, to improve the positioning accuracy and reliability of regulating valves.

(2) Used in situations where the pressure difference between the two ends of the valve is large (△ p>1MPa). By increasing the pressure of the gas source, the output force of the actuator is increased to overcome the unbalanced force generated by the liquid on the valve core and reduce the stroke error.

(3) When the medium being adjusted is high temperature, high pressure, low temperature, toxic, flammable, or explosive, in order to prevent external leakage, the packing is often pressed tightly, resulting in a large frictional force between the valve stem and the packing. At this time, using a locator can overcome the time delay.

(4) When the medium being adjusted is a viscous fluid or contains suspended solids, a locator can overcome the resistance of the medium to the movement of the valve stem.

(5) Used for regulating valves with large diameters (Dg>100mm) to increase the output thrust of the actuator.

(6) When the distance between the regulator and the actuator is over 60m, using a locator can overcome the delay in control signal transmission and improve the valve's response speed.

(7) Used to improve the flow characteristics of regulating valves.

(8) When a regulator controls two actuators to implement split range control, two locators can be used to receive low input signals and high input signals respectively. One actuator will perform a low range action and the other will perform an elevation action, which constitutes split range regulation.