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Advantages and disadvantages of pressure thermometers
2011-12-9 9:41:24

Let me briefly introduce a pressure type thermometer in the thermometer for everyone

Thermometer is a general term for temperature measuring instruments

There are kerosene thermometers, alcohol thermometers, mercury thermometers, gas thermometers, resistance thermometers, thermocouple thermometers, radiation thermometers and light thermometers, and bimetal thermometers, depending on the temperature measurement substance used and the measurement range.

Pressure thermometer

The disadvantages are: the measurement range is limited, generally at -80 ~ 400 degrees Celsius, and the large heat loss has a slow response time; the instrument seal system (temperature pack, capillary tube, spring tube) is difficult to repair and must be replaced; the measurement accuracy is affected by the ambient temperature, temperature The installation position of the package has a greater impact; the accuracy is relatively

Low; capillary transmission distance is limited; the normal working range of the pressure thermometer should be one-half to three-quarters of the measurement range; and the display meter and the temperature pack should be horizontal as much as possible; the temperature pack for installation Mounting bolts can cause temperature loss, resulting in inaccurate temperature, installation

Should be insulated, and try to make the temperature pack work in an environment without vibration!


He is one of the earliest methods used in temperature control of the production process. Pressure-type temperature measurement systems are still widely used in local indication and control of temperature. Advantages of pressure thermometer: simple structure, high mechanical strength, not afraid of vibration. Cheap price, no need for outside

Ministry of Energy

是利用封闭容器内的液体、气体或饱和蒸汽受热后产生体积膨胀或压力变化作为测信号、他的基本结构是由温包,毛细管和指示表三部分组成! The pressure thermometer uses the volume expansion or pressure change of the liquid, gas or saturated steam in the closed container as the measurement signal. Its basic structure is composed of a thermostat, a capillary tube and an indicator table.