Oil Pressure Calibration Bench for Pressure Gauge and Transmitter Verification

1. Why You Need It

Every plant that relies on pressure measurement needs a trusted reference to verify its gauges and transmitters against — otherwise, calibration drifts go unnoticed until they cause process errors or safety issues. This oil pressure calibration bench generates stable pressures from -80 kPa vacuum to 60 MPa, letting technicians calibrate and verify pressure gauges, transmitters and switches against a ±0.1% FS reference. It is the metrology workhorse for instrument workshops, quality labs and field service teams.

2. Working Principle

The calibration bench uses a hand pump or pneumatic/hydraulic pressure source to generate a precise, adjustable test pressure, with oil as the pressure-transmitting medium for high ranges. The pressure under test is compared against an internal high-accuracy reference, and the instrument under test is adjusted to match. With analog and digital output options, the bench provides a stable, repeatable reference for verifying measurement accuracy across a wide range.

3. Key Advantages

• Range -0.1 to 60 MPa (vacuum to high)
• ±0.1% FS reference accuracy
• Analog and digital output
• Gauge / absolute / sealed gauge
• 5-50 °C working temperature
• Multiple power options (5/12/24 V)
• M12 electrical connection
• ±0.10% URL 12-month stability
• Suitable for gauges and transmitters
• Portable bench-top design

Common Pain Points & Solutions

Application Cases

Technical Specifications

FAQ

Q: What is a pressure calibration bench?

A pressure calibration bench is a precision instrument used to generate known pressures and compare them against the reading of a pressure gauge, transmitter or switch. It provides a stable reference pressure so technicians can verify accuracy, adjust calibration and document traceability. It is the standard tool in instrument workshops and calibration laboratories.

Q: What is the pressure range?

The bench covers a range of -0.1 to 60 MPa, spanning deep vacuum (-80 kPa) through to high pressure (60 MPa). This wide range allows calibration of most industrial pressure gauges, transmitters and switches with a single bench, eliminating the need for multiple calibrators.

Q: How accurate is it?

The reference accuracy is ±0.1% FS, providing a trustworthy standard for verifying field instruments that typically have 0.25-1% FS accuracy. The ±0.10% URL stability over 12 months ensures the reference itself remains reliable between recalibrations.

Q: Can it calibrate vacuum instruments?

Yes, the bench generates pressures down to -80 kPa vacuum, so it can calibrate vacuum gauges and transmitters as well as positive-pressure instruments. This vacuum capability is important for process plants that use vacuum measurement and need to verify those instruments.

Q: What instruments can it calibrate?

It can calibrate pressure gauges, pressure transmitters, pressure transducers and pressure switches. The analog and digital outputs and the wide range allow the bench to drive and verify almost any pressure instrument used in industrial service.

Q: Why use oil as the medium?

Oil is used as the pressure-transmitting medium for high pressure ranges because it is incompressible and provides stable, controllable pressure without the risk of gas expansion. For lower ranges and vacuum, the bench's pressure source is configured accordingly. Oil-filled systems are standard for high-pressure calibration.

Q: What output does it provide?

The bench provides analog and digital output options, allowing it to interface with the instrument under test and with data-logging or documentation systems. This supports both manual calibration and automated, traceable calibration procedures.

Q: How is it powered?

It supports multiple power options — 5 V DC, 12 V DC, 24 V DC and 9-30 V DC — making it flexible for different workshop and field power sources. The M12 electrical connection provides a secure interface.

Q: How often should the bench be recalibrated?

The bench itself should be recalibrated against a higher-level standard on a periodic basis, typically annually, to maintain its ±0.1% FS reference accuracy. Its ±0.10% URL 12-month stability means it holds its calibration well, but traceability to a national standard is maintained through periodic recalibration.

Q: Where is it used?

It is used in instrument workshops, quality and metrology laboratories, field service teams and process plant maintenance shops. Anywhere pressure gauges, transmitters and switches must be verified and calibrated to maintain measurement accuracy and traceability.