(1). Transmitter has no output 1. Check whether the power supply of the transmitter is reversed; Connect the polarity of the power supply correctly 2. Measure the power supply of the transmitter, whether there is 24V DC voltage; Must guarantee the power supply to the transmitter Voltage ≥12V (ie transmitter power supply input voltage ≥12V). If there is no power, you should check whether the loop is broken, whether the instrument is selected wrongly (the input impedance should be ≤ 250Ω); 3. If it is with a header, check whether the header is damaged (you can short the first two lines of the header, if the short circuit is normal, then the header is damaged); header damage is required to replace the header, 4. Connect the ammeter to the 24V power supply circuit to check if the current is normal. If it is normal, then the transmitter is normal. At this time, check whether other instruments in the circuit are normal. 5. Whether the power supply is connected to the transmitter power input; Connect the power cord to the power terminal. (2). Transmitter output ≥20mA 1. If the power supply of the transmitter is less than 12VDC, you should check whether there is a large load in the loop. The input impedance of the transmitter load should meet RL ≤ (transmitter supply voltage -12V)/( 0.02A) Ω 2. Whether the actual pressure exceeds the selected range of the pressure transmitter; Reselect the appropriate range of pressure transmitter. 3. If the pressure sensor is damaged, severe overload can sometimes damage the isolation diaphragm. Need to send back to the manufacturer for repair. 4. If the wiring is loose, connect the cable and tighten it. 5. Whether the power cable wiring is correct. The power cable should be connected to the corresponding terminal. (3). Transmitter output ≤ 4mAOutput ≤ 4mA 1. If the transmitter power supply is normal, if it is less than 12VDC, you should check whether there is a large load in the circuit. The input impedance of the transmitter load should meet RL ≤ (Transmitter Supply voltage -12V)/( 0.02A) Ω 2. Whether the actual pressure exceeds the selected range of the pressure transmitter; Reselect the appropriate range of pressure transmitter pressure sensor is damaged, severe overload may sometimes damage the isolation diaphragm. Need to send back to the manufacturer for repair. (4). Wrong indication of incorrect pressure indication 1. Is the transmitter power normal? If it is less than 12VDC, you should check whether there is a large load in the circuit. The input impedance of the transmitter load should meet the RL ≤ (transmitter supply voltage -12V) / (0.02A) Ω 2. The reference pressure value must be correct If the accuracy of the reference pressure gauge is low, a more accurate pressure gauge must be replaced. 3. The range of the pressure indicating instrument is the same as the range of the pressure transmitter. The range of the pressure indicating instrument must be consistent with the range of the pressure transmitter. 4. The pressure indicator input and the appropriate wiring is correct The input of the pressure indicating instrument is 4~20mA, then the output signal of the transmitter can be directly connected; if the input of the pressure indicating instrument is 1~5V, the input of the pressure indicating instrument must be connected with an accuracy of one thousandth. One or more resistors with a resistance of 250Ω are then connected to the transmitter input. 5. The input impedance of the transmitter load should meet RL ≤ (transmitter supply voltage -12V) / (0.02A) Ω If it does not comply, then according to its different measures can be taken: such as raising the supply voltage (but must be less than 36VDC), reduce the load, etc. 6. If the multi-point paper recorder is not recording, if the input is open, if it is open, then: 1), can no longer bring other loads; 2) Change to other recorders with an input impedance of ≤ 250Ω when not recording. 7. The corresponding device housing is grounded. The device housing is grounded. 8. Whether separate from AC power and other power cables and AC power and other power cables 9. If the pressure sensor is damaged, severe overload can sometimes damage the isolation diaphragm. Need to send back to the manufacturer for repair. 10. If there are sand, impurities, etc. in the pipeline, the pipeline will be blocked. If impurities are present, the accuracy of the measurement will be affected. It is necessary to clean the impurities and add a filter before the pressure interface. 11. The temperature of the pipeline is too high, the use temperature of the pressure sensor is -25 ~ 85 °C, but the actual use is -20 ~ 70 °C. Add a buffer tube to dissipate heat. Add some cold water in the buffer tube before use to prevent the superheated steam from directly hitting the sensor, thereby damaging the sensor or reducing the service life. SPC Sheet And Profiles Production Line SPC Pipe Extrusion Machine,SPC Pipe Or Sheet Extruder,SPC Sheet Machine Extrusion Line zhangjiagang sevenstars machinery co.,ltd , https://www.sevenstarsmachinery.com