Pressure transmitter selection is crucial for ensuring accurate and reliable measurements in various industrial applications. The following key points will help you select a right pressure transmitter.
Pressure Range at the Measurement Point
- Determine the maximum pressure to be measured in the system.
- Select a transmitter with a range 1.5 times the maximum pressure to account for irregular peak pressures, especially in water pressure measurement and processing.
- Use a buffer to reduce the impact of pressure surges and protect the instruments.
Temperature Range at the Measurement Point
- Temperature changes can affect the zero drift and full-scale drift of the transmitter, leading to uncertain measurement data.
- Transmitters have two calibrated temperature ranges: the ambient temperature range (for normal operation) and the temperature compensation range (for maintaining performance specifications).
- Ensure the transmitter operates within these ranges to avoid failure due to environmental temperature impacts.
Output Signal
- Common output methods include 4…20mA, 1…5V, or digital interface protocols (Modbus, Hart).
- In industrial settings, current output is preferred for its strong interference resistance.
- In areas with poor electromagnetic compatibility or prone to lightning, consider using special anti-interference protectors or filters.
Measuring Medium
- The pressure-sensitive diaphragm can be inside the pressure interface or exposed (flat diaphragm).
- For viscous liquids and sludge, use a flat diaphragm pressure transmitter to prevent blockage.
- Ensure materials in contact with the medium (rubber seals, 304 and 316 stainless steel) are compatible. For corrosive mediums, select a fully welded or corrosion-resistant transmitter.
Accuracy
- Accuracy includes basic error and hysteresis error, typically ±0.5%FS or ±1%FS.
- Choose the appropriate accuracy based on measurement requirements, keeping in mind that higher accuracy increases complexity and cost.
Power Supply Range
- Match the transmitter’s power supply voltage with the system’s voltage.
- For analog output transmitters, ensure their load capacity matches the system to maintain measurement accuracy.
Pressure Connection and Sealing Method of the Transmitter
- Customize the pressure interface according to requirements, but prefer commonly used interfaces.
- The pressure interface must withstand the measurement point pressure to prevent leaks or dangerous incidents.
If you need more info about pressure transmitter selection, please contact fandesensor for free.