Piston pressure gauge

The XYGK series piston pressure gauge is newly developed, designed, and manufactured by our company in accordance with the latest national verification regulations for "piston pressure gauges" and the requirements of JJG59-2007. The piston pressure gauge is a high-precision, highly reproducible, and highly reliable standard pressure measuring instrument based on Pascal's law and the principle of hydrostatic equilibrium. Often simply referred to as a pressure gauge or pressure balance, it is primarily used in metrology laboratories, research laboratories, and production or scientific experiments as a reference pressure instrument. It is also directly employed in high-reliability monitoring applications for voting-based monitoring of other local instruments.

Performance Features

1. Both the piston and piston cylinder are made of high-strength, high-hardness, and low-thermal-expansion tungsten carbide material through meticulous grinding. The small thermal expansion coefficient and minimal deformation ensure a low periodic variation rate of the piston's effective area, wide operating temperature range, and stable performance.

2. Due to the adoption of new materials, technologies, and processes, the technical specifications of the new piston pressure gauge have been significantly improved. It is widely used to calibrate digital pressure gauges, precision pressure gauges, pressure transmitters, pressure sensors, and other pressure instruments.

3. The load center of gravity is low, with weights directly applied to the piston via a weight holder, ensuring smooth piston operation, minimal pressure fluctuation, and accurate readings.

4. For pressures above 25 MPa, a low-viscosity diisooctyl sebacate is used as the pressure transmission medium, ensuring extremely high sensitivity of the pressure gauge.

5. All weights used in the pressure gauge are made of non-magnetic stainless steel. (Class 0.05 weights are made of carbon steel.)

6. The piston's working position is monitored by a displacement sensor, with a piston travel range of ±1.5 mm. The display instrument is sensitive, clear, and accurate.

7. Wide measuring range, with basic errors of ±0.01%, ±0.02%, ±0.05%, and ±0.05% at the lower limit of 1 MPa.

8. Functions: Calibration of piston pressure gauges, digital pressure gauges, precision pressure gauges, pressure transmitters, etc.

9. Piston material: Tungsten carbide

10. Weight material: Stainless steel; carbon steel

11. Working medium: Transformer oil or a mixture of transformer oil and kerosene for pressures below 25 MPa; diisooctyl sebacate for pressures above 25 MPa.

Main Technical Parameters

Measurement range and accuracy level are tested under environmental conditions of (20±5)°C, relative humidity ≤80%, atmospheric pressure 86-106 kPa, and temperature fluctuation not exceeding 0.5°C. The accuracy grades are shown in the table.

Note: High-pressure piston pressure gauges above 100 MPa can be customized. Please call for inquiries.

Daily Maintenance and Repair Tips

1. Keep the pressure gauge clean and avoid placing it in excessively high temperatures to prevent corrosion.

2. Quick connectors and O-rings at the lower end of the piston are prone to damage. Replace them if leakage is detected.

3. The liquid level in the oil cup should always be above the upper end of the oil cup filter cover. If neglected, air may enter the pre-pressure pump, causing it to fail. In such cases, loosen the pre-pressure pump oil inlet connector to allow air to escape with the liquid. When the liquid flows out continuously, tighten the connector to restore the pre-pressure pump function.