Industrial Strain Gauge Pressure Transmitter for Automation

1. Why You Need It

Industrial automation needs rugged, accurate, cost-effective pressure measurement across a wide span — from hydraulic systems to high-pressure process lines. This strain gauge pressure transmitter delivers 0.1%-0.5% FS accuracy over a 0-100 MPa range, with a fast ≤10 ms response and a lightweight aluminium housing. It is the dependable workhorse for machine builders and automation engineers who need reliable pressure data without over-specifying.

2. Working Principle

The transmitter uses strain gauges bonded to a diaphragm. As pressure deflects the diaphragm, the strain gauges change resistance in proportion to the applied pressure, and a Wheatstone bridge converts this into a 4-20 mA signal. The bridge output is temperature-compensated and conditioned for stable, accurate measurement. The strain-gauge principle is mature, robust and well-proven across decades of industrial automation.

3. Key Advantages

• Strain gauge sensing element
• 0.1% - 0.5% FS accuracy
• 0 to 100 MPa range
• 4-20 mA output
• ≤10 ms response time
• Aluminium housing (lightweight)
• -20 to 120 °C operating range
• 1/4 NPT thread connection
• M10×1 female output interface
• Ideal for industrial automation

Common Pain Points & Solutions

Application Cases

Technical Specifications

FAQ

Q: What is a strain gauge pressure transmitter?

A strain gauge pressure transmitter measures pressure using strain gauges bonded to a diaphragm. When pressure deflects the diaphragm, the gauges change resistance, and a Wheatstone bridge converts this into an output signal. The strain-gauge principle is mature, robust and cost-effective, making it the most widely used industrial pressure sensing technology.

Q: What is the accuracy?

The accuracy is 0.1% to 0.5% FS depending on the model and range. This provides reliable measurement for industrial automation, hydraulics and process monitoring. The higher-accuracy 0.1% version suits applications needing tighter measurement, while 0.5% FS covers general monitoring.

Q: What is the measurement range?

The range is 0 to 100 MPa, covering a wide span from low process pressures to high hydraulic and injection molding pressures. The span is configured for the application, and the transmitter is calibrated so the output corresponds to the required range.

Q: How fast is the response?

The response time is ≤10 ms, so the transmitter provides current pressure data for fast automation and control loops. This is important for hydraulic presses, injection molding machines and other dynamic systems where lag would cause control instability.

Q: What is the housing material?

The housing is aluminium, which is lightweight, durable and cost-effective. Aluminium provides adequate protection for most industrial environments while keeping the transmitter light, which is an advantage in machine and automation installations.

Q: What is the operating temperature range?

The operating temperature range is -20 to 120 °C, covering most industrial and machine applications. Temperature compensation is applied to the bridge output so the measurement remains accurate across this range.

Q: What output does it provide?

It provides a 4-20 mA output signal, the standard for industrial automation. The output interface is an M10×1 female thread, providing a secure electrical connection for the signal wiring.

Q: How is it installed?

The transmitter is installed via its 1/4 NPT process connection into the pressure port, with the M10×1 electrical interface for the signal cable. It is compact enough for machine mounting on hydraulic manifolds, injection units and test fixtures.

Q: How does it compare to capacitive sensors?

Strain gauge sensors are generally lower cost and suitable for a wide range of general industrial measurement, while capacitive sensors offer higher precision and lower drift for demanding process applications. For automation and hydraulic duties where 0.1%-0.5% FS accuracy is sufficient, the strain-gauge transmitter provides the best value.

Q: Where is it used?

It is used in hydraulic presses, injection molding machines, machine cells, test rigs and industrial automation systems. It provides reliable, cost-effective pressure measurement across a wide 0-100 MPa range for machine builders and automation engineers.