Hot:13252013-11-02 01:22:43 From: FTD Automation Instruments
How to Choose Pressure Transmitters
Here is to introduce how to choose Pressure transmitters,
First, Measuring medium: Whether measuring medium can block the pressure connection port, is it corrosive or whether it can destroy transmitter. These factors determine the pressure transmitter wetted parts material and whether choose diaphragm . Now mostly adopts 316 stainless steel, 316 stainless steel corrosion resistance is stronger, a lot of medium can measure.
Second, pressure range : general pressure transmitter maximum range should be measured pressure maximum 1.5 times, many occasions fluid pressure is abnormally fluctuates up and down, the continued high pressure or accidental peak value may shorten the service life of the pressure transmitters. Sometimes, we add a buffer in the measurement of forepart to reduce the burr, but the speed of response will reduce.
Three, temperature range: pressure transmitter has two temperature range, respectively is normal operating temperature range and compensation temperature range. Normal operating temperature range beyond this range , the output may fail to reach due index. Temperature compensation range output will meet the requirements, the range is small. Temperature effect output is embodied in the following two aspects: one is the zero drift; The second is to influence full scale output.
Four, Accuracy of Pressure transmitters : influence accuracy factors is nonlinear, hysteresis property, the repeatability, in addition to zero offset scale, temperature, etc. In the choice of pressure transmitters, do not blindly pursue high precision, the accuracy is high, the price is more expensive, try to choose in the measurement of linear range.
Five, the compatibility and stability: determine whether the pressure transmitter can adapt to the multiple application system, if the product has good compatibility, so even if changed the transmitter used, also won't affect the operation of the whole system. This is very important in the maintenance of process. Stability refers to the use of a long time later, its performance still can remain unchanged. Choose the transmitter should have strong environment adaptability. Six, signal output type signal type choice depends on many factors, such as signal transmission distance, the whether there is strong electromagnetic environment, output signal whether to need to enlarge, amplifier on the where, etc. Output signal types have mainly 4 to 20 ma, 0 to 10 v, 0 to 20 ma, 0 to 5 v and frequency output, etc.
Edit by FTD Automaton Instruments (www.ftdinsruments.com)