Selection technique of Ross Mont pressure transmitter
1. What kind of pressure is the pressure transmitter to measure
To determine the maximum value of the measured pressure in the system, a transmitter with a pressure range of about 1.5 times larger than the maximum is generally required. This is mainly in many systems, especially in water pressure measurement and processing. There are peak and irregular fluctuation. This instantaneous peak can destroy the pressure sensor. The constant high pressure value or a little more than the maximum of the transmitter will shorten the life of the sensor, and this will also reduce the accuracy. So a buffer can be used to reduce the pressure burr, but this will reduce the response speed of the sensor. Therefore, the pressure range, accuracy and stability should be taken into full consideration when selecting the transmitter.
2. What kind of pressure medium
The viscous liquid and mud will plug the pressure interface, and the solvent or corrosive substance will not destroy the material in the transmitter that directly contact with these media. These factors will determine whether the direct isolation membrane and the material directly contact with the medium will be selected.
3. What is the precision of the pressure transmitter
Determine the accuracy, nonlinearity, hysteresis, non repeatability, temperature, zero offset scale, and temperature. But it is mainly nonlinear, retarded, non repeatable, and the higher the precision, the higher the price.
4, the temperature range of the transmitter
Usually a two temperature transmitter calibration will indeed, one temperature is normal working temperature, and a temperature compensation range, normal working temperature refers to the temperature range when transmitter is not destroyed in the working condition, beyond the temperature compensation range may not reach the performance index the application of.
The range of temperature compensation is a typical range that is smaller than the working temperature range. Working transmitters in this range will certainly achieve their performance indicators. The temperature change affects its output from two aspects, one is zero drift, and the two is the full range output. For example, the full range of /-X%/ C, the /-X%/ of reading, the /-X% of the full range beyond the temperature range, and the /-X% of readings in the range of temperature compensation, if there is no such parameters, it will lead to the uncertainty in use. The change to degree of the output of the transmitter is caused by pressure change or is caused by temperature change. The temperature effect is the most complex part of knowing how to use a transmitter.