Industrial 4-20mA Pressure Transmitter for Gas and Liquid Measurement

1. Why You Need It

Factory automation, water treatment, HVAC and hydraulic systems all share a common need: dependable, continuous pressure measurement at a sensible cost. This industrial pressure transmitter delivers 0.5% FS accuracy with a 4-20 mA output, 304 stainless steel construction and IP65 protection. It is the general-purpose workhorse that provides reliable gas and liquid pressure monitoring for a broad range of industrial duties, with a customizable range from 0.6 bar to 600 bar.

2. Working Principle

The transmitter measures process pressure with a sensing element (typically a strain-gauge or piezoresistive diaphragm) and converts it to a 4-20 mA signal. The 304 stainless steel housing protects the electronics, and the sensor is temperature-compensated for stable output. Optional outputs include 0-10 V and RS485 Modbus, providing flexibility for different control system interfaces.

3. Key Advantages

• 4-20 mA output
• 0.5% FS accuracy (0.25% optional)
• 304 stainless steel housing
• IP65 protection
• 0~0.6 bar to 0~600 bar range
• 24 V DC (12-36 V DC) supply
• G1/4, G1/2, M20×1.5, 1/2 NPT
• -20 to 85 °C operating range
• RS485 Modbus optional
• Suitable for gas and liquid media

Common Pain Points & Solutions

Application Cases

Technical Specifications

FAQ

Q: What is an industrial pressure transmitter?

An industrial pressure transmitter is a device that converts gas or liquid pressure into a standard output signal, typically 4-20 mA, for monitoring and control. It is the most common pressure instrument in factory automation, water treatment, HVAC and hydraulic systems, providing continuous, reliable pressure data to the control system.

Q: What is the accuracy?

The accuracy is 0.5% FS standard, with a 0.25% FS high-precision option. This provides sufficient accuracy for general industrial monitoring and control. The high-precision version is used where tighter measurement is required.

Q: What output does it provide?

It provides a 4-20 mA two-wire output, with 0-10 V and RS485 Modbus options. The 4-20 mA loop is the standard for industrial control, the 0-10 V suits data acquisition and HVAC, and RS485 provides digital networking for multi-instrument systems.

Q: What is the measurement range?

The range spans 0~0.6 bar to 0~600 bar and is customizable. This wide, flexible range allows the transmitter to be specified for almost any industrial pressure application, from low gas pressures to high hydraulic pressures.

Q: What is the housing material?

The housing is 304 stainless steel, with 316L available as an option. 304 stainless steel provides good corrosion resistance for general industrial use, while 316L offers enhanced resistance for more aggressive environments and media.

Q: What is the protection grade?

The housing is IP65 rated, protecting against dust and low-pressure water jets. This makes the transmitter suitable for washdown areas, outdoor installations and dusty industrial environments.

Q: What power supply does it need?

It operates on a 24 V DC supply, with a wide 12-36 V DC range. This flexibility allows the transmitter to be powered from standard industrial power supplies without a dedicated source.

Q: What media can it measure?

It measures gas and liquid media compatible with the wetted materials. Typical media include air, water, oil, glycol and process gases. For aggressive or corrosive media, the wetted material compatibility should be confirmed.

Q: What process connections are available?

Process connections include G1/4, G1/2, M20×1.5 and 1/2 NPT, covering the most common industrial fittings. This variety allows the transmitter to be installed directly into existing piping and equipment without adapters.

Q: Where is it used?

It is used in factory automation, water treatment, HVAC and hydraulic systems. It provides reliable, cost-effective continuous pressure measurement wherever a general-purpose 4-20 mA pressure transmitter is needed.