3. What is the temperature resistance of the sensor?
Answer: Pressure sensors, like all physical equipment systems, can produce errors or even become unusable in extreme temperature environments. Generally, each sensor will have two temperature ranges, namely the working range and the compensation range. The scope of compensation is included in the scope of work.
The working range means that within this range, the sensor can be exposed to the medium without being damaged after being energized. However, this does not mean that the performance can reach the nominal specifications (temperature coefficient) when it is outside the compensation range.
The compensation range is generally a narrower range within the working range. Within this range, the sensor ensures that the nominal specifications can be reached. The change of temperature affects the sensor through two methods, one is to cause zero drift, and the other is to affect the output of the entire range. Sensor specifications should list these errors in the following form: ± x% full scale / ° C, ± x% reading / ° C, ± x% full temperature compensation range or ± x% full temperature compensation range reading. Without these parameters, it will cause you uncertainty in use. So is the change in sensor output due to pressure change or temperature change? When understanding how to use the sensor, the temperature effect will be the most complicated part.
4. Which output to choose?
Answer: General sensors have millivolt output, or voltage amplification, or milliamp, or frequency output. The selected output type depends on the distance between the selected sensor and the system control or display components, noise, and other electrical interference, as well as whether it needs to be amplified, and where the amplifier is best placed. For many OEMs, the distance between their control elements and sensors is very short, so millivolt output is generally sufficient and the cost is low.
If you need to amplify the sensor output, it is easier to use another sensor with a built-in amplifier. In long-distance cables, or in areas with large electrical noise, mA output or frequency output is required. In the environment with strong radio frequency interference and electromagnetic interference, it is necessary to consider adding some shielding or filtering equipment outside the milliamp and frequency output.