Product Introduction 

The double-piston pressure vacuum gauge typically consists of a simple piston system, a differential piston system, a set of specialized weights, and a calibrator. Its principle involves utilizing the mass balance difference between the simple piston and the differential piston to achieve a measuring standard that can start from zero (atmospheric pressure) and measure both positive and negative pressures. When measuring positive pressure, the differential piston rises, and weights are loaded onto the differential piston to balance it with the simple piston; when measuring negative pressure, the simple piston rises, and weights are loaded onto the simple piston to balance it with the differential piston. The measurement range of the double-piston pressure vacuum gauge is as follows: lower limit: -0.1 MPa; upper limit: 0.25 MPa, 0.6 MPa, 0.8 MPa, 1 MPa.

Technical Specifications

   Model No.:CWZ-25T，CWZ-60T,CWZ-80T，CWZ-100T；

v Measurement Range:（-0.1-0.25）MPa;(-0.1-0.6)MPa;(-0.1-1)MPa；

v Precision Grade0.05 grade; 0.02 grade; 0.01 grade;

Piston MaterialTungsten carbide

v Work MediumAir

Lubrication:Transformer oil or transformer oil with meiOilMixed oil;

v Structure:Desktop

Male threaded fittingM20 X 1.5；

Primarily used for verification:Precision pressure gauges, pressure transmitters, calibration pressure gauges, and pressure transmitters with 0.05, 0.1, 0.16, 0.25, and 0.4 classes of accuracy, within the range of (-0.1~1) MPa.

Performance Features

1、 Compliant with metrological verification regulations.

2、 Pistons and piston sleeves are precision ground, resulting in minimal roundness error and clearance. This significantly enhances the piston's rotation duration, correspondingly reducing the piston's descent speed and improving its discrimination ability.

3、 The weights have been corrected for the coefficient of pressure deformation and the local gravity acceleration.

4、 Measurement Range: Nominal measurement range is consistent with the actual measurement range.

5、 Can be used as a transit piston gauge; also for high-precision testing. Compatible with kg weights and Mpa weights.

6、 Advanced pressure system, lightweight and durable.

7、 Certificates available for calibration; Dual piston vacuum pressure gauges with an accuracy grade of 0.01 can only issue calibration certificates as per regulations.

8、 High stability with zero-point repeatability, easy adjustment, accurate readings, sensitivity less than 5 milligrams, capable of measuring precise pressure gauges and pressure transmitters (pressure sensors) below 10kPa, with a resolution of 1kPa for pressure values, and no dead zone between -0.1 and 1MPa.

9、Improved the original dual-piston vacuum gauge, which suffered from unstable piston balance and inaccurate measurements due to inherent deficiencies. Now, we offer clients a high-quality dual-piston vacuum gauge that solves the problem of poor vacuum and low-pressure measurement, providing a standard instrument for pressure value transmission and precise pressure measurement.