4-20mA Current Loop Pressure Sensors for Long Distance Signal Transmission

Explore robust 4-20mA output pressure sensors ideal for industrial process control. Benefit from noise immunity, loop power, live zero diagnostics, and long-distance signal transmission for PLC & DCS integration.

Our range of pressure sensors with 4-20mA current loop outputs provides a robust and reliable solution for industrial process measurement and control applications. This industry-standard signal offers excellent noise immunity, ideal for long-distance transmission back to PLCs or DCS systems without signal degradation, while the ‘live zero’ feature enhances system diagnostics by clearly indicating loop faults. Explore sensors designed for demanding environments, often featuring convenient loop-powered operation for simplified installation.

Helium leak tested and cleaned 100 psig pressure sensor for high purity gas systems - Engineered for critical gas applications, this sensor features an all-welded construction and a thick stainless steel diaphragm to prevent helium and hydrogen permeation.
-760mmHg to +20 kg/cm² pressure transmitter with HART coms - Compound range transmitter for sensing pressure from -760 mm of mercury vacuum to 20 kilograms per sq cm positive pressure with HART communication.

16 bar, 200°C steam pressure transmitter and gauge - Combined pressure transmitter and indicator in one package with the option for use with high temperature media such as steam at 200°C
Air classification system powder duct pressure transmitter with +/-15 kPa range and ATEX/IECEx IS cert - This pressure transmitter with open port design is ideal for monitoring duct pressures in powder air classification systems. It features ATEX/IECEx IS certification and a -15 to +15 kPa range.
SIL2 approved 10 bar pressure transducer with 4 to 20 mA output - Pressure transducer with SIL 2 approved electronics that provide a 4-20mA output over a 0-10bar working range.
-10…30 kPa g compound range inert gas pressure transmitter for ship IG system - An intrinsically safe, marine approved compound range pressure transmitter for ship cargo tank IG system use to measure pressure of inert gas over a range of -10 to 30 kPa g from the G1/2 male process connection, and sending the corresponding 4-20mA signal through the DIN plug electrical connection.
Dirty water, sludge & sewerage tank level 400 mbar pressure sensor - Flush ceramic diaphragm pressure sensor for measuring level of a dirty water, sludge & sewerage tank.
Low operating temperature plus/minus 1 psi pressure transmitter - Reliable pressure measurements down to -40°C. Ideal for low range applications with a -1 to +1 psi gauge range.

Air Replacement Plant (ARP) 100 mm H2O differential pressure transmitter - Differential pressure transmitters for instant monitoring of the air flow going through the painting booth interior
Ex rated ambient pressure sensor with 800-1100 mbar range - Could you give details of a high accuracy pressure sensor which measures ambient pressure (800 to 1100 mb) for environmental purposes.
Mechanical press 1000 bar pressure sensor and panel indicator - sensor and panel mount digital indicator for measuring the overload pressure in a mechanical press
Argon gas compatible pressure sensor for measuring up to 100 mbar - I have an Argon filled chamber that I wish to measure pressure up to 100 millibar relative to atmosphere.
High reading rate for measuring dynamic pressures to -200psf - DMP320 which has a high sampling rate of 10 kHz so you will easily resolve the dynamic change characteristic over 0 to -200 psf within the 8sec window.
1013 to 1400 mbar barometric pressure transmitter & readout - barometric pressure transmitter that can measure ambient air pressure from 1013-1400 mb in a chamber and provide a 4-20 mA output signal.

Find out more about 4-20mA Output Pressure Sensors to determine which product options and capabilities will best meet your application requirements.

Pressure sensors incorporating a 4-20mA (milliamp) current loop output represent a cornerstone technology in industrial process measurement and control. This analogue signalling standard is specifically favoured for its inherent resilience against electrical noise interference, a common challenge in plant environments with heavy machinery and long cable runs. Unlike voltage signals which can attenuate significantly over distance, the 4-20mA current signal maintains its integrity, ensuring reliable pressure data transmission from the point of measurement back to central control systems, even over hundreds of meters.

A key advantage appreciated by process engineers and instrument technicians is the typical 2-wire configuration, often referred to as ‘loop-powered’. In this setup, the sensor draws its operating power directly from the same two wires that carry the output signal current. This simplifies wiring installation and reduces costs compared to sensors requiring separate power connections, making integration into existing plant infrastructure more straightforward. The required DC supply voltage (commonly 24Vdc) must simply be sufficient to drive the current through the total loop resistance, including wiring and receiver input resistance.

The ‘live zero’ characteristic of the 4-20mA signal, where 4mA corresponds to the sensor’s zero pressure reading (or the lower range value), provides a vital diagnostic function. A current reading of 0mA indicates a fault condition, such as a broken wire or sensor failure, rather than a valid zero pressure reading. This fail-safe indication is critical for maintaining process safety and operational awareness, allowing control systems like PLCs or DCS to immediately flag loop integrity issues.

These sensors interface directly with a wide array of standard process instrumentation. Inputs on Programmable Logic Controllers (PLCs), Distributed Control Systems (DCS), data loggers, chart recorders, and digital panel meters are commonly designed to accept this 4-20mA input directly. Within the control system, the 4mA to 20mA range is easily scaled to correspond to the sensor’s specific calibrated pressure range (e.g., 0 to 100 bar, -1 to 5 bar), translating the raw current signal into meaningful engineering units for monitoring, control logic, and historical trending.

Applications are diverse, ranging from monitoring hydraulic system pressures in manufacturing facilities and measuring hydrostatic level in tall chemical storage tanks to controlling fluid flow rates in pipelines within petrochemical refineries or monitoring steam pressure in power generation turbines. The robustness of the 4-20mA signal makes these pressure sensors suitable for demanding environments, including installations requiring intrinsic safety barriers for operation within potentially hazardous areas, where limiting electrical energy is paramount. Choosing the correct wetted materials and process connection type remains crucial to ensure compatibility with the specific fluid or gas being measured and the operational pressures involved.

Product Help

Checklist for 4 to 20 milliamps output pressure transmitter requirements

Define your 4-20mA output signal pressure transmitter requirements using this checklist:

Pressure range?
Output signal? 4-20 milliamps
Accuracy?
Electrical connection?
Process connection?
Process media type?
Temperature range?