The selection of pressure sensors is mainly based on the properties of the measured medium, with cost-effectiveness and ease of installation and maintenance as considerations. For example, in cases where the measured medium is high viscosity, prone to crystallization, and highly corrosive, an isolated pressure sensor must be selected.
When selecting a transmitter, the corrosion of the diaphragm metal by the medium must be considered. The diaphragm material must be carefully selected. Transmitter diaphragm materials include ordinary stainless steel, 304 stainless steel, 316L stainless steel, tantalum diaphragm material, etc.
When selecting a model, the temperature of the medium being measured should be considered. If the temperature is high, generally between 200℃ and 400℃, a high-temperature model should be selected. Otherwise, the silicone oil will vaporize and expand, making the measurement inaccurate.
When selecting a transmitter, the operating pressure rating of the equipment must be considered, and the pressure rating of the pressure sensor must be compatible with the application. Regarding the transmitter's measurement range, most sensors have a certain adjustable range. Setting the operating range to 1/4 to 3/4 of its range ensures accuracy, which is especially important for differential pressure transmitters. In practice, some applications (liquid level measurement) require shifting the sensor's measurement range. The measurement range and shift amount must be calculated based on the installation location. Shifts can be positive or negative.
