The role of temperature in transmitters
The role of temperature in transmitters
Pressure transmitter is a commonly used measuring instrument, mainly used for the measurement of density, steam, gas, liquid and other substances, and has a very wide range of applications. The temperature in the transmitter plays a very big role in it!
No matter what kind of electronic measuring meter will have a certain accuracy error, but because the accuracy level of each country is different, for example, the accuracy of the national standard such as my country and the United States is the part with the best linearity of the sensor, that is, we The accuracy is usually between 10%-90% of the measurement range; the accuracy of the European standard is the worst part of the linearity, which is what we usually call 0-10% and 90%-100 of the measurement range. precision between %. For example, the accuracy of the European standard is 1%, and the accuracy in my country is equivalent to 0.5%.
For temperature compensation the range is typically a smaller range than the operating temperature range. Operating the pressure transmitter in this category will definitely achieve its due performance indicators. The temperature change affects this display from two aspects, one is the zero drift, and the other is the full-scale display. For example: +-X%°C of full scale, +-X%°C of reading, +-X%°C of full scale when it is out of the temperature range, +-X% of the reading when it is within the temperature compensation range, if there is no such parameter , will lead to uncertainty in use. Whether the changes displayed by the transmitter are caused by changes in roommate pressure or changes in temperature. Temperature effects are part of the complexity of understanding how to use a pressure transmitter.
In addition to the need to pay attention to the temperature control, the use of pressure transmitters also needs to pay attention to many problems, such as: do not use a voltage higher than 36V to the transmitter to cause damage to the transmitter; do not touch the diaphragm with hard objects, Cause the isolation diaphragm to be damaged; the measuring medium is not allowed to freeze, otherwise the isolation diaphragm of the sensor element will be damaged, resulting in damage to the transmitter. If necessary, the transmitter should be temperature protected to prevent freezing.
It should also be noted that when measuring steam or other high-temperature media, the temperature should not exceed the limit temperature when used for air supply. If the temperature is higher than the limit temperature used by the pressure transmitter, a heat sink must be used; when measuring steam or other high-temperature media, a heat sink should be used. The pipe is where the transmitter and the pipe are connected together, and the pressure on the pipe is used to transmit it to the transformer. When the north ring is water vapor, an appropriate amount of water should be injected into the heat pipe to prevent the superheated steam from directly contacting the transmitter and damaging the sensor.
