FW MURPHY PXT-K Series Pressure Transmitters Instruction Manual

Pressure Transmitters Installation Instructions
Models: PXT-K and PXT-KM

PXT-K Series Pressure Transmitters

Please read the following instructions before installing. A visual inspection of this product for damage during shipping is recommended before mounting. It is your responsibility to have a qualified person install the transmitter.
This FW Murphy instrument is susceptible to damage when exposed to static electrical changes. To avoid this damage, observe the following:

1. Disconnect all electrical power to the machine.
2. Follow the lock out/tag out safety procedures of your company. Ensure the machine cannot operate during installation.
3. Follow the safety warning of the machine manufacturer.
4. Read and follow all installation instructions.

PXT-K Series

The PXT-K (PA/PR 23SYEi) Series pressure transmitters are state-of-the-art instruments providing 4-20 mA outputs. Each pressure transmitter contains a transducer comprised of a piezoresistive silicon chip mounted on a glass-metal feedthrough header  lded into a stainless steel housing and filled with silicone oil. The very thin laser-welded stainless steel isolation-diaphragm completes the front side. Media pressure is transferred from the stainless steel isolation-diaphragm via the oil inside the cell to the silicon-measuring chip. This construction, combined with the advanced internal signal conditioning circuitry, results in a rugged instrument with extremely small temperature error and class-leading EMI/RFI resistance.

Operating Range Chart

Supply voltage for the PXT-K must be within range of 8-30 VDC. The graph below shows the minimum supply voltage (VDC) required for a given load resistance *(R). Note:** Cable resistance effect included in RL.

Minimum Voltage for Common Input Modules

Model| Input Impedance| Vmin
Centurion C4-1| 2310| 14.
MX5| 2210| 13.
VRU Pro| 200 C)| 13.00
Centurion C5
MX5-R2
Third Party PLC (typical)| 2490| 14.

Installation Precautions

Installation Precautions:

• Pulsating pressure variations caused by liquid or gasses under pressure can destroy any pressure transmitter and should be avoided. To avoid damaging surges and hammers:
  » Apply pressure slowly and open/close valves gradually.
  » Install a surge chamber or a pressure snubber. Such as our PD8100 Series Pulsation Dampener as an option. Contact FW Murphy for details or check www.fwmurphy.com.

• Symptoms of fluid hammer and surge damage:
  » Pressure transmitter exhibits an output at zero pressure (large zero offset).
  » Pressure transmitter output remains constant regardless of pressure.
  » In severe cases, there will be no output.

PXT-K and PXT-KM Pressure Ranges

PXT-K and PXT-KM Models (4-20 mA) (Flying lead)

Model Number| Pressure Range| Overpressure
PXT-K(M)-30V3OWC| -30″ H,o to +30″ H,o| 3 X or ±90 in. H2O
PXT-K(M)-30V30| -30″ Hg to +30″ psig| 1 X Vac. 2 X PSI
PXT-K(M)-30V100| -30″ Hg to +100″ psig| 1 X Vac. 3 X PSI
PXT-K(M)-15| 0-15 psig| 3 X PSI
PXT-K(M)-60| 0-60 psig| 2 X PSI
PXT-K(M)-100| 0-100 psig
PXT-K(M)-200| 0-200 psig
PXT-K(M)-300| 0-300 psig
PXT-K(M)-400| 0-400 psig
PXT-K(M)-600| 0-600 psig
PXT-K(M)-1000| 0-1000 psig
PXT-K(M)-2000| 0-2000 psig| 1.5 X PSI
PXT-K(M)-3000| 0-3000 psig
PXT-K(M)-5000| 0-5000 psig
PXT-K(M)-6000| 0-6000 psig
PXT-K(M)-10000| 0-10000 psig| _ 1.1 X PSI

Specifications

Operating Pressure Range: See table, Pressure Ranges
Operating Temperature: -22 to 176° F (-30 to 80° C)
Compensated Temp Range: -20 to 160° F (-29 to 71° C)
Process Connection: 1/4”-18 NPT female with 7/8” Hex nut (2000 psig and under) or 1-3/16” Hex nut (3000 psig and over)
Electrical Connection: PXT-K: 1/2” NPT male conduit connection, 60” long cable, vented PXT-KM: M12 connector
Enclosure: NEMA 4/IP65 or better
Body: 316L stainless steel
Wetted Parts: 316L stainless steel
Environmental Effect (Humidity):
No effect for 0-95%, non-condensing
Mounting: All axis positions, has negligible effect on performance as long as it is perpendicular to the flow being monitored
Shock Resistance: 800g per IEC 60068-2-27 (Mechanical Shock)
Vibration Resistance: 20G per IEC 60068-2-6 (Vibration under resonance)
Wiring Protection: Protected against reverse polarity and short circuit, 48 VDC Maximum
Supply Voltage: 10-30 VDC (Typically 24 VDC)
Transmitter Output: 4-20 mA, two wire configurations with load characteristics
Insulation: Greater than 10 MΩ @ 300 VDC
Electromagnetic Compatibility (EMC): Standards; EN 610006-2:2005, EN 61000-6-3:2007, EN 61326-2-3:2006
Voltage Surge/Spike Protection: Protection against a 600 volt spike per IEC 60-2 Accuracy
Tolerance: See page 4
Applicable Standards
CSA (c/us): Class I / II / III, Div 1, Groups A-F T4 Class I / II / III, Div 2, Groups A-D,F,G T4
ATEX: IBExU 10 ATEX 1124 X II 1G Ex ia IIC T6-T4 II 3G Ex nA IIC T6
Canadian Registration Number: OF15236.2 (all providences and territories)

Mounting

Caution: Transmitters are precision instruments. Do not install in a manner that causes side stress or is subject to excessive vibration.

• Transmitters can be mounted on any axis with negligible position error as long as it is perpendicular to the flow being monitored.
• Mount the transmitter where there is minimum vibration.
• Apply Teflon tape/sealant to the pressure-fitting threads before installing.
• When tightening, apply a wrench to the hex wrench flats located just above the pressure fitting. DO NOT tighten by using a pipe wrench on the housing.

Caution: Readings may be incorrect if the vent tube becomes blocked or bent (kinked). Keep reference vent tube unobstructed and free from excessive moisture or liquid ingress (400 psi and below).
Noise
Recommendations for minimum noise susceptibility:

• Avoid running the transmitter cabling in a conduit that contains high voltage AC power cables or the ignition loom on an engine.
• Avoid running the cable near inductive equipment, where possible.
• Shielded cable is always recommended.
• PXT-K Series products are not constructed to be isolated, and the shield/drain should not be grounded in the panel. (NOTE: A typical shield/drain is isolated from the transmitter body and should be grounded on the panel end only. The PXT-K Series products drain wire should not be grounded in the panel.)

Hazardous Area Electrical Installation

NOTES:

1. INSTALLATION INSTRUCTIONS FOR CLASS I/II/II_ DIVISION 2

• CLASS I, DIVISION 2, GROUPS A,B,C,D T4

• CLASS IL DIVISION 2, GROUPS F,G T4
  *  — CLASS IIL, DIVISION 2, T4
  UNITS MEET CLASS DIV 2 ZONE 2 WHEN INSTALLED IN ACCORDANCE WITH CLASS DIV 2 ZONE 2 METHODS.EITHER BY USING THE CONDUIT CONNECTION AND GROUND CONNECTION PROVIDED OR BY INSTALLING IN A SUITABLE ENCLOSURE ACCEPTABLE TO THE LOCAL AUTHORITY HAVING JURISDICTION.
  MODELS WITH KM OR KD IN THE MODEL NUMBER CAN BE MOUNTED OUTDOORS WITH A SUITABLE CLASS I, DIVISION 2, OR ZONE 2, RATED CABLE ASSEMBLY AND THE M12 CONNECTOR WITH A TURCK LOKFAST® GUARD OR EQUIVALENT OVER THE M12 CONNECTOR, OR THE DIN 43650 CONNECTOR. NO BARRIER IS REQUIRED.

  2. INSTALLATION INSTRUCTIONS FOR CLASS I/II/II_ DIVISION 1

• — CLASS |, DIVISION 1, GROUPS A,B,C,D T4

• — CLASS I, DIVISION 1, GROUPS E.F,G

• — CLASS Ill, T4

BARRIER NOTES

1. OUTPUT CURRENT MUST BE LIMITED BY A RESISTOR SUCH THAT THE OUTPUT VOLTAGE Vs CURRENT PLOT IS A STRAIGHT LINE BETWEEN Voc AND Isc
2. BARRIER MUST BE INSTALLED AS INSTRUCTED BY THE MANUFACTURER
3. SELECTED BARRIER INTRINSICALLY SAFE CIRCUITS SHALL BE APPROVED FOR CLASS I/II, DIV 1, GRP A-G
4. TERMINATE BARRIER EARTH GROUND TO THE GROUND BUS OF THE POWER DISTRIBUTION PANEL. RESISTANCE TO GROUND MUST NOT BE GREATER THAN 1 OHM

Dimensions, Connections and Accuracy **

**

PXT-K Dimension and Connections
2000 psig and below models

3000 psig and above models PXT-KM Dimension and Connections
2000 psig and below models

M12 CONNECTOR

PIN OUT| 2-WIRES 4-20mA
PIN 1| n/a
PIN 2| V-/SIG
PIN 3| #NAME?
PIN 4| n/a

3000 psig and above models

M12 CONNECTOR

PIN OUT| 2-WIRES 4-20mA
PIN 1| n/a
PIN 2| V-/SIG
PIN 3| +Vdc
PIN 4| n/a

In order to consistently bring you the highest quality, full-featured products, we reserve the right to change our specifications and designs at any time.
FW MURPHY product names and the FW MURPHY logo are proprietary trademarks. This document, including textual matter and illustrations, is copyright protected with all rights reserved. (c) 2021 FW MURPHY. A copy of our typical warranty may be viewed or printed by going to www.fwmurphy.com/warranty.

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References

• FW Murphy Production Controls
• Warranty & Terms of Sale - FW Murphy Production ControlsFW Murphy Production Controls

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