Siemens pressure transmitterPrecautions to be taken during use. The correct installation position of the transmitter on the process pipeline is related to the measured medium, and there are many precautions to be taken to achieve the best measurement effect.

1. What kind of pressure medium

Viscous liquids and mud may block the pressure interface, and solvents or corrosive substances may damage the materials in direct contact with these media in the transmitter. The above factors will determine whether to choose direct isolation membranes and materials that come into direct contact with the medium.

2. What is the required accuracy for selecting pressure transmitters

The factors that determine accuracy include nonlinearity, hysteresis, non repeatability, temperature, zero offset scale, and the influence of temperature. But mainly due to nonlinearity, hysteresis, non repeatability, the higher the accuracy, the higher the price.

3. What kind of pressure does the transmitter need to measure

First, determine the maximum value of the measured pressure in the system. Generally, it is necessary to choose a transmitter with a pressure range that is about 1.5 times larger than the maximum value. This is mainly due to peak values and continuous irregular fluctuations in many systems, especially in water pressure measurement and processing, which can damage pressure sensors. Continuous high pressure values or slightly exceeding the calibrated maximum value of the transmitter will shorten the lifespan of the sensor and also reduce accuracy. So a buffer can be used to reduce pressure spikes, but this will slow down the response speed of the sensor. So when choosing a transmitter, it is necessary to fully consider the pressure range, accuracy, and stability.

4. Temperature range of transmitter

Usually, a transmitter will calibrate two temperature ranges, one of which is the normal operating temperature and the other is the temperature compensation range. The normal operating temperature range refers to the temperature range when the transmitter is not damaged during operation. If it exceeds the temperature compensation range, it may not meet its performance indicators for application.

The temperature compensation range is a typical range that is smaller than the operating temperature range. Working within this range, the transmitter will definitely achieve its expected performance indicators. Temperature changes affect its output from two aspects: zero drift and full-scale output. For example:+/- X%/℃ of full scale,+/- X%/℃ of reading,+/- X% of full scale when outside the temperature range, and+/- X% of reading within the temperature compensation range. Without these parameters, it will lead to uncertainty in use. Is the change in transmitter output caused by pressure changes or temperature changes. The temperature effect is the most complex part of understanding how to use a transmitter.

5. Encapsulation of transmitter

The packaging of the transmitter is often overlooked as its rack, but this will gradually expose its shortcomings in future use. When choosing a transmitter, it is important to consider the future working environment, humidity, installation methods, and whether there will be strong impacts or vibrations.

6. The transmitter needs to maintain stability after timeout operation

Most transmitters will experience "drift" after excessive operation, so it is necessary to understand the stability of the transmitter before purchasing. This pre operation can reduce various troubles that may occur in future use.