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指针式压力仪表,只能测出容器、管道内的压力。倘若测量压力参数,或进行压力遥测、记录、监控、自控时,则需用压力传感器。压力有表压力、真空度(负压力)、差压和绝对压力之分。绝对压力是指被测介质作用在容器单位面积上的压力。地面上的空气柱产生的平均压力称为大气压力。绝对压力与大气压力之差叫表压力。当绝对压力值小于大气压力时,表压力为负
Pointer pressure meter, can only measure the pressure inside the container, the pipeline. If the pressure measurement parameters, or pressure telemetry, recording, monitoring, automatic control, the pressure sensor is required. Pressure gauge pressure, vacuum (negative pressure), differential pressure and absolute pressure of the points. Absolute pressure refers to the measured pressure acting on the unit area of the container. The average pressure generated by the air column on the ground is called atmospheric pressure. The difference between absolute pressure and atmospheric pressure is called gauge pressure. When the absolute pressure value is less than atmospheric pressure, the gauge pressure is negative