1. Problem phenomenon: FKA transmitter has no output
Check and test
1. Check whether the power supply of the transmitter is reversed;
2. Check whether the power supply of the transmitter has 24V DC voltage;
3. If it has a meter head, check whether the meter head is damaged (you can short-circuit the two lines of the meter head first, if it is normal after the short circuit, it means that the meter head is damaged);
4. Connect the ammeter in series with the 24V power circuit to check whether the current is normal;
5. Whether the power supply is connected to the power input end of the transmitter;
Solution
1. Connect the power supply polarity correctly.
2. It must be ensured that the power supply voltage supplied to the transmitter is greater than or equal to 12V (that is, the voltage at the input terminal of the transmitter power supply is greater than or equal to 12V).
3. If there is no power supply, check whether the circuit is disconnected and whether the detection instrument is selected incorrectly (input impedance should be ≤250Ω);
4. If the meter head is damaged, you need to replace the meter head. If it is normal, it means that the transmitter is normal. At this time, you should check whether other instruments in the loop are normal.
5. Connect the power cord to the power terminal.
2. Problem phenomenon: FKP transmitter output ≥20mA
Check and test
1. Is the power supply of the transmitter normal?
2. Whether the actual pressure exceeds the selected range of the pressure transmitter;
3. Whether the pressure sensor is damaged, severe overload sometimes damages the isolation diaphragm.
4. Whether the wiring is loose;
5. Is the wiring of the power cord correct?
Solution
1. If the power supply of the transmitter is less than 12VDC, 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. Re-select the pressure transmitter with the appropriate range.
3. If the pressure sensor is damaged, it needs to be sent back to the manufacturer for repair.
4. Connect the wires and tighten them.
5. The power cord should be connected to the corresponding terminal.
3. Problem phenomenon: FKA transmitter output ≤4mA
Check and test
1. Is the power supply of the transmitter normal?
2. Whether the actual pressure exceeds the selected range of the pressure transmitter;
3. Whether the pressure sensor is damaged, severe overload sometimes damages the isolation diaphragm.
Solution
1. If the transmitter power supply is less than 12VDC, check whether there is a large load in the loop. The input impedance of the transmitter load should meet RL≤(transmitter power supply voltage -12V)/(0.02A) Ω.
2. Re-select the pressure transmitter with the appropriate range.
3. If the pressure sensor is damaged, it needs to be sent back to the manufacturer for repair.
4. Problem phenomenon: FKP transmitter pressure indication is incorrect
Check and test
1. Is the power supply of the transmitter normal?
2. Whether the reference pressure value must be correct
3. Whether the range of the pressure indicating instrument is consistent with the range of the pressure transmitter
4. Is the input of the pressure indicating instrument and the corresponding wiring correct?
5. The input impedance of the transmitter load should meet RL≤(transmitter supply voltage -12V)/( 0.02A) Ω
6. Whether the input terminal is open when the multi-point paper recorder does not record;
7. Whether the corresponding equipment shell is grounded
8. Is it separate from the AC power supply and other power supplies?
9. Whether the pressure sensor is damaged, severe overload sometimes damages the isolation diaphragm.
10. Whether there are sand, impurities, etc. in the pipeline that block the pipeline, and the measurement accuracy will be affected when there are impurities;
11. Whether the temperature of the pipeline is too high, the operating temperature of the pressure sensor is -25~85℃, but it is within -20~70℃ in actual use.
Solution
1. If the transmitter power supply is less than 12VDC, check whether there is a large load in the loop. The input impedance of the transmitter load should meet RL≤(transmitter power supply voltage -12V)/(0.02A) Ω.
2. If the accuracy of the reference pressure gauge is low, it is necessary to replace the pressure gauge with higher accuracy.
3. The range of the pressure indicating instrument must be consistent with the range of the pressure transmitter.
4. If the input of the pressure indicating instrument is 4~20mA, the output signal of the transmitter can be directly connected; if the input of the pressure indicating instrument is 1~5V, it must be connected to the input end of the pressure indicating instrument with an accuracy of 1,000. 1/1 and above, the resistance value is 250Ω, and then connect to the input of the transmitter.
5. The input impedance of the load of the transmitter should meet RL≤, if not, corresponding measures can be taken according to the difference: such as increasing the supply voltage (but it must be lower than 36VDC), reducing the load, etc.
6. If the input terminal of the multi-point paper recorder is not recording, if the input terminal is open: 1. No other load can be carried; 2. Use other recorders whose input impedance is less than or equal to 250Ω when there is no recording.
7. The corresponding equipment shell is grounded.
8. Separate the wiring from the AC power supply and other power supplies.
9. If the pressure sensor is damaged, it needs to be sent back to the manufacturer for repair.
10. When there are sand and impurities in the pipeline that block the pipeline, it is necessary to clean up the impurities and add a filter before the pressure interface.
11. The temperature of the pipeline is too high. Add a buffer tube to dissipate heat. Before use, add some cold water to the buffer tube to prevent the superheated steam from directly impacting the sensor, thereby damaging the sensor or reducing the service life.
