4-20mA Transmitters

Pressure Transmitters (mA)

Current Output Pressure Transmitters for gauge, absolute & differential pressure sensing where a robust 2 wire 4-20mA current output loop is required which can work over long distances without signal degradation.

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Product Categories

General Purpose Pressure Transmitters

Pressure transmitters for general purpose applications measuring air and liquid pressures on pumps, valves, compressors, hydraulic presses and automated machines.

Low Range Pressure Transmitters

Low range pressure transmitters for measuring low level gauge, differential and absolute pressures below 1 bar (15 psi, 400 inWG or 1000 mbar).

Mid Range Pressure Transmitters

Mid range pressure transmitters for measuring pressures between 1 and 100 bar (15 to 1500 psi).

High Range Pressure Transmitters

High range pressure transmitters for measuring hydraulic pressure greater than 100 bar (1500 psi) with a range of accuracies, electrical interfaces and pressure connectors.

Absolute Pressure Transmitters

Current output transmitters for measuring pressure with an absolute reference. Absolute referenced pressure transmitters genrate a 4mA output signal when the pressure corresponds to a perfect vacuum. An absolute pressure transmitter is used in applications where the pressure of a gas or liquid is isolated from atmospheric pressure changes, for example when testing a sealed pressure vessel for leaks over a long period of time.

Air Pressure Transmitters

Pick a sensor tranmsitter with a 4-20 mA loop output for measuring system air pressures and select appropriate options for monitoring environmental air pressure changes, ventilation duct air pressure, air compressor, air cleaning or pneumatic feed lines.

ATEX Approved Pressure Transmitters

ATEX approved pressure transmitters for use in hazardous zones with flammable gases present such as petrochemical refineries and natural gas distribution pipelines.

Barometric Pressure Transmitters

4 to 20 mA output transmitters with compressed output scalings for better resolution when measuring incremental changes in atmospheric pressure. These baro pressure transmitters can be incorporated into environmental control and monitoring systems, gas analysers and other equipment which requires the measurement of ambient air pressure to compensate measurement of another physical parameter.

Compact Pressure Transmitters

These small and lightweight milliamp output transmitters require no mounting brackets and can be installed using a single threaded or flange seal process connection. Due to the compact design of these pressure transmitters, there are no removable or repairable components and there is typically no manual zero and span adjustment potentiometers, and therefore can be treated as zero maintenance hardware.

Compound Pressure Transmitters

4 to 20 milliamp output transmitters for measuring plus and minus pressures from the same device. Compound range transmittters are calibrated with the most negative reading at 4mA and the most positive reading at 20 mA. Since the same sensing diaphragm is used to measure both the negative and the positive pressure, there is a limit to how great the ratio between positive and negative pressure can be, before the lower range of the two becomes too inaccurate. In the case of a -1 to 10 bar (-15 to +300 psi range which is accurate to 0.25%, will be accurate to only 2.5% over the vacuum range.

Custom Pressure Transmitters

Select a custom specification for a 4-20mA pressure transmitter to suit your special application requirements. These customisable pressure transmitters have modular designs which offer a wide choice of product specification options covering electrical and mechanical parameters.

Differential Pressure Transmitters

Differential pressure transmitters for measuring the DP of fluids and gases across particle filters and along a length of pipe to monitor flow.

Fast Delivery Pressure Transmitters

Standard specification 4-20mA output pressure transmitters available for fast delivery from stock or on a short build time. View prices and specifications and then select options to receive an instant quotation via email or buy online.

Flush Pressure Transmitters

Flush fitting pressure transmitters with 4 to 20mA current loop signals with exposed diaphragms for measuring viscous media or substances which require hygienic or sanitary compatibility.

Flush Submersible Pressure Transmitters

Water resistant 4 to 20 milliamp transmitters for use on waste water or high viscosity liquids such as sludge, sewage and leachate. Select a transmitter for sensing hydrostatic level pressure to determine the quantity of wastewater stored in a pit or tank, monitor potential hazards to the environment from chemical overspill into surrounding groundwater or providing longer preventive maintenance intervals for removing build up of solids on the sensing diaphragm.

Gas Pressure Transmitters

Current output sensors for monitoring the pressure of different types of gas such as air, natural gas, nitrogen, oxygen and other common gases. Measure very low inlet and output pressure or very high gas bottle pressures. Some pressure transmitters include special options for gases which require no hydrocarbons and cleaned material surfaces in contact with the gas. Where there is the potential for flammable gases to be present in the local atmosphere, special approval options such as ATEX intrinsic safety are available.

HART Pressure Transmitters

HART protocol compatible pressure transmitters for configuration via a pc, laptop, distributed control system or HART communicator. HART functionality enables the transfer of pressure transmitter data via an AC digital signal which uses the 4-20mA analogue output signal as a carrier, thus eliminating the need for extra wires and connectors.

High Accuracy Pressure Transmitters

Digitally compensated 4-20mA transmitters for measuring pressure with a high degree of accuracy. These pressure transmitters combine highly repeatable sensing technology such semiconductor strain gauge sensing chips with digital signal conditioning electronics to provide a current output signal with the smallest error over the operating pressure and temperature range.

High Precision Pressure Transmitters

High precision pressure transmitters with good non-linearity, hysteresis and repeatability for highly precise measurements.

High Temperature Pressure Transmitters

Find a 4-20mA pressure transmitter tolerant to high temperature applications such as steam power, food and drink processing, plastic moulding and engine monitoring. Ideal for applications where it is not possible to move the pressure transmitter away from the source of high temperature.

Hydraulic Pressure Transmitters

Pick out a millamp current output transmitter for measuring hydraulic pressures on material testing machines, actuation control systems, pressure rating test equipment, lifts, elevators, cranes and heavy lifting equipment.

Hydrostatic Pressure Transmitters

Current loop output sensor transmitters for measuring the hydrostatic pressure exerted by a static head of liquid. Use these pressure transmitters to measure fluid level in storage tanks, processing vessels, header tanks, pump inlet head and other applications where hydrostatic pressure is used to determine liquid height.

Hygienic Pressure Transmitters

All welded stainless steel flush diaphragm sensor transmitters for use in food processing, brewing, distilling, medical products, semiconductor manufacturing processes and other sterile industrial environments. Choose a hygienic 4-20mA loop pressure transmitter with a non-toxic food grade oil filled diaphragm seal for monitoring hydrostatic pressures to determine level and volume of tank contents or the pressure of gases generated by a process.

Integrated Display Pressure Transmitters

Current output transmitters with an integrated LCD or LED digital display for local reading of pressure.

IP68 Pressure Transmitters

Waterproof pressure transmitters rated to IP68 for permanent underwater installations or temporary flooding protection. These pressure tranmsitters are fitted with watertight cable connections in the form of a plug and socket or integral cable gland seal to prevent the ingress of water to a specified depth and time period.

Liquid Level Pressure Transmitters

Use these pressure transmitters to measure the level of a liquid by measuring the pressure of a liquid column directly above the measurement point. Find pressure transmitters for measuring liquid level in different types of installation such as external mounting via a thread or flange seal to a tank wall or sinking a pressure transmitter into the liquid.

Low Differential Pressure Transmitters

Select a current loop transmitter for measuring a small pressure difference between two measurement points such as a either side of a ventilation fan, across an air filter or inside and outside a clean room. Typically these pressure tranmsitter have a 4 to 20 milliamp output scaled over a few millibar or a few inches of water.

Marine Approved Pressure Transmitters

Current Transmitters approved and certified for use on marine vessels to measure pressure and tank contents. Find a 4-20mA pressure transmitter for use on shipping systems such as marine engines, cargo storage tanks, fuel gauging, fresh water storage, wastewater management, heating, cooling and ballast tank control. For applications on oil, LNG and LPG tankers there are also ATEX approved intrinsically safe options available. For liquid level measurement there are options for mounting pressure transmitters onto external flanges, submerging into the tank or mounting inside a submerged pipe.

OEM Pressure Transmitters

Current output pressure sensor modules for integration into process instrumentation designs. Custom low cost modular designs which can be easily assembled into a range of press connection housings to increase flexibility of engineering design and manufacturing processes.

Panel Meters for Pressure Transmitters

Digital panel meters for providing loop power and reading 4 to 20mA output pressure transmitters with LED displays, peak hold, alarm relays, Triacs, retransmission analogue outputs and digital interfaces.

Plug On LED Displays for Pressure Transmitters

Loop powered 4-20mA readouts for combining with pressure transmitters to provide a local display at point of measurement without the need for batteries, extra wiring or mounting brackets.

Pressure Gauge Transmitter

Choose a combined pressure transmitter and pressure gauge for transmitting a displayed pressure reading over a 4to20mA current loop to process control instrumentation. These pressure gauge transmitters are powered externally, usually via powered 2 wire current loop sensing circuit. Some pressure gauge tranmsitters als include the option alarm trips to switch process equipment on and off.

Pressure Indicator Transmitter

Combined digital indicator and 4-20 milliamp pressure tranmsitter for providing a local indication of pressure reading. The built-in digital indicators can be scaled via push buttons or adjustment pots to any pressure unit or a 0-100% full scaling. No additional external supply is required, since the digital indicator is current loop powered.

Rangeable Pressure Transmitters

Rangeable pressure transmitter which can be either digitally or manually down ranged by the user to scale the 4 to 20mA current output signal to a different pressure range.

Steam Pressure Transmitters

High temperature compatible transmitters for measuring steam pressures on power generation, food processing and sterilizing equipment. These 4-20 milli-amp pressure transmitters include mechanical cooling features which protect the heat sensitive components such as sensing diaphragms and electronics from heat damage. There is no need to fit pig tails or stand-off pipes to reduce high process temperatures when installing these pressure transmitters.

Strain Gauge Pressure Transmitters

Select from a range of pressure transmitters which include a strain gauge element as the sensing technology. Strain gauge sensing technology comes in many different forms, but the common benefits of them all is that it is possible to produce a small and low cost design which rapidly responds to changes in pressure.

Submersible Pressure Transmitters

Select a 4-20mA current loop output sensor for placing underwater to measure liquid level, water depth or pressure of submerged equipment. These pressure transmitters are designed to be permanently installed underwater to a specified depth and are IP68 rated.

Suction Pressure Transmitters

Milliamp output sensors for transmitting the amount of measured suction pressure. All suction range pressure transmitters measure over a negative pressure range with respect to a higher pressure on the reference side of the sensing diaphragm.

Temperature and Pressure Transmitters

Measure both pressure and temperature at the same time within the same sensor transmitter. These milliamp current output transmitters incorporate a temperature sensor and a pressure sensor and provide a dual 4-20mA output from one instrument. Used in applications with limited number of mounting points and space for installing instrumentation. Improve pressure reading accuracy by monitoring temperature at point of measurement and applying correction due to temperature errors.

Vacuum Pressure Transmitters

Choose a loop powered pressure transmitter for measurements over the low vacuum range of 25 to 760 Torr absolute or negative gauge. Measure partial vacuums used for manufacturing processes, food packaging, autoclave sterilization, leak testing, process purging and atmospheric simulation.

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