1、 Installation precautions

1. Media isolation and protection
   • Avoid direct contact with corrosive or overheated media, and use isolation tanks or protective sleeves if necessary.
   • When measuring steam or high-temperature media, the temperature should not exceed the limit value of the transmitter. A heat dissipation device (such as a heat pipe or condenser) should be installed, and an appropriate amount of water should be injected into the condenser to prevent overheated steam from directly impacting the sensor.
2. Design of Pressure Pipe
   • Length and BalanceThe length of the positive and negative pressure side pressure pipes should be as equal as possible, and the liquid column pressure head should be balanced to reduce the impact of environmental temperature fluctuations on measurement.
   • Installation location：
     • Liquid flow measurementInstalled next to or below the pipeline to facilitate the discharge of bubbles into the pipeline.
     • Gas flow measurementInstalled next to or above the pipeline to facilitate the flow of liquid into the pipeline.
     • Steam flow measurementInstall under the pipeline to ensure that the condensate water fills the pressure pipe.
   • Avoid blockage and sedimentationThe pressure pipe should be installed in areas with small temperature gradients and no eddy currents to prevent slag deposition or crystal blockage.
3. environmental adaptability
   • Avoid strong electromagnetic interference (such as motors, frequency converters) and vibration sources, and if necessary, use shielded cables and single ended grounding.
   • When installing outdoors, a protective box should be added to prevent rainwater and dust from entering.

2、 Wiring precautions

1. Separation of power and signal lines
   • Use shielded twisted pair cables (such as 24AWG or higher) to connect signal lines, avoiding parallel laying with strong electrical cables and reducing electromagnetic interference.
   • The power supply voltage should not exceed 36V, and the polarity should be connected correctly to prevent damage to electronic components.
2. Terminal block processing
   • Before wiring, ensure that the transmitter is powered off and tighten all wiring terminals to avoid poor contact or short circuits.
   • The cable entrance needs to be sealed (such as using waterproof joints or flexible pipes) to prevent rainwater leakage.

3、 Zero adjustment and calibration precautions

1. Zero point calibration conditions
   • Under known zero differential pressure conditions (such as closing the three valve group balance valve and opening the high and low pressure valves), perform zero point calibration to ensure that the pressure on the high and low pressure sides is equal and usually atmospheric pressure.
   • The temperature of the positive and negative pressure chambers and the impulse pipe should be consistent during zero adjustment to avoid zero drift caused by temperature differences.
2. Range calibration method
   • Use a standard pressure source (such as a pressure calibrator) to apply a known differential pressure for range calibration.
   • Consider the impact of actual operating conditions on parameters such as medium density, and perform temperature and pressure compensation if necessary.
3. Three valve group operation sequence
   • When put into operationFirst, close the balance valve, then slowly open the high and low pressure valves to avoid direct impact of the medium on the sensor diaphragm.
   • During shutdownClose the high and low pressure valves first, then open the balance valve to prevent damage to the diaphragm caused by one-way compression.

4、 Daily use and maintenance

1. Media status monitoring
   • To prevent the medium from freezing or crystallizing, heat tracing or insulation treatment should be carried out on the transmitter if necessary.
   • Regularly check whether the pressure pipe is unobstructed, promptly drain accumulated fluid or gas, and avoid measurement errors.
2. Mechanical protection
   • Avoid touching the membrane with hard objects to prevent damage to the isolation membrane.
   • The installation bracket should be firm and kept away from vibration sources to reduce the impact of mechanical stress on the sensor.
3. Regular inspection and recording
   • Regularly check the sealing, electrical connections, and status of the pressure pipes, and record maintenance information such as calibration dates and cleaning dates.
   • Regularly calibrate the sensor output using standard calibration equipment to ensure long-term stability.

5、 Key points for troubleshooting

1. No output or abnormal output
   • Check the power supply voltage, polarity, and fuse to confirm the continuity of the circuit.
   • Check whether the pressure pipe is blocked or leaking, and whether the valve status is correct.
2. Output fluctuation
   • Check if the tested medium is stable and adjust the damping coefficient to suppress pulsation.
   • Check if the wiring is loose or there is interference, and optimize the shielding grounding.
3. zero drift
   • Re calibrate the zero point and check if the ambient temperature is stable.
   • Confirm that the installation position is not affected by stress, and adjust the installation method if necessary.