主要适用于机车车辆上用来测量液压系统或储气缸的压力； The double needle pressure gauge is mainly suitable for measuring the pressure of hydraulic systems or storage cylinders on rolling stock;
It can also be used for non-corrosive, non-composite and solidified medium pressure measurement of copper alloy brazing.
The meter can measure two pressures that are the same or different (the difference between the two should generally not be greater than 1/3 of the limit on the scale range).
适用于测量无爆炸危险，不结晶，不凝固及对钢合金不起腐蚀作用的液体、蒸汽和气体等介质的压力 The pressure gauge is suitable for measuring the pressure of liquids, vapors and gases without explosion hazard, non-crystallization, non-solidification and non-corrosive effect on steel alloys.
The working principle of the meter is based on the elastic deformation of the elastic element (spring tube in the measurement system).
That is, under the action of the measured pressure, the ends of the two spring tubes are caused to have corresponding displacements.
With the help of the lever through the gear transmission mechanism and magnification, the red,
The black pointer chases the two measured values on the dials respectively;
检测仪表的正确选用主要包括确定仪表的压力型式（如量测的是表压还是差压还是负压或是绝压）、量程范围、量测压力单位、分辨、 The correct selection of pressure detection instruments mainly includes determining the pressure type of the instrument (such as measuring gauge pressure or differential pressure or negative pressure or absolute pressure), measuring range, measuring pressure unit, resolution,
Accuracy and sensitivity, external dimensions and whether remote transmission is required and other functions such as indication, recording, adjustment, alarm, etc.