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Temperature transmitter problems and solutions in installation and debugging
1, the transmitter has no output
Testing and testing
Solution
1. Check whether the transmitter power is reversed;
2. Measure the temperature transmitter power supply, whether there is 24V DC voltage;
3. If it is with a header, check the header is damaged (you can first short-circuit the two main lines of the header, if the short circuit is normal, indicating that the header is damaged);
4. Connect the current meter into the 24V power supply circuit and check that the current is normal.
1. The power polarity is connected correctly;
2 must ensure that the power supply voltage supply to the transmitter ≥ 12mA; if there is no power, you should check the circuit is broken, the detection instrument is selected wrong (input impedance should be ≤ 250Ω;
3. Another replacement of the header;
4. If the transmitter is normal, it is necessary to check whether other instruments in the circuit are normal.
2, transmitter output ≥20mA
Testing and testing
Solution
1. Is the transmitter power normal?
2. Whether the power cord is connected to the input of the thermal resistance;
3. Does the actual temperature exceed the transmitter's selected range?
4. Is the thermal resistance or thermocouple broken?
5. Is there any loose wiring?
6. Whether the platinum resistance three-wire connection is correct;
7. Is the temperature of the piping too high?
1. 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. Connect the power cord to the power terminal;
3. Re-select the appropriate range of temperature transmitter;
4. If it is broken, it needs to be replaced with platinum resistance or thermocouple;
5. Take the thread and tighten it;
6. If the input is three-wire, you must connect three lines;
7. Add the buffer tube to dissipate heat. Before use, it is best to add some cold water in the buffer tube to prevent the superheated steam from directly hitting the sensor, thereby damaging the sensor or reducing the service life;
3, transmitter output ≤ 4mA
Testing and testing
Solution
1. Is the transmitter power normal?
2. Does the actual temperature exceed the transmitter's selected range?
3. Whether the platinum resistance three-wire connection is correct;
1. If it is less than 12 VDC, 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 appropriate range of temperature transmitter;
3. Input one end of the positive platinum resistance, and input the two ends of the negative end of the platinum resistance on the other end of the two wires;
4, the temperature transmitter accuracy is not satisfactory
Testing and testing
Solution
1. Is the transmitter power normal?
2. Is there any integration debugging?
3. Whether the thermal resistance (or thermocouple) and the shell insulation meet the requirements;
1. If it is less than 12 VDC, 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. Conduct integration debugging;
3. If the insulation is not satisfactory, the corresponding insulation treatment is required;
5, indicating that the temperature is incorrect
Testing and testing
Solution
1. The reference temperature is correct;
2. The range of the temperature indicating instrument is the same as the measuring range of the temperature transmitter;
3. The temperature indicator instrument input and the corresponding wiring is correct;
4. Whether the thermal resistance (or thermocouple) and the shell insulation meet the requirements;
5. Is the power supply of the transmitter correct? Is it 24 VDC?
6. The input impedance of the transmitter load should meet RL ≤ (transmitter supply voltage -12V) / (0.02A) Ω;
7. Whether the input of the multi-point paper recorder has no record is open;
8. The corresponding device housing is grounded;
9. Is it routed separately from AC power and other power sources?
1. If the accuracy of the reference thermometer is low, then a high-precision thermometer is used;
2. The range of the temperature indicating instrument must be consistent with that of the temperature transmitter;
3. The input of the temperature indicating instrument is 4 ~ 20 mA, then the transmitter output signal can be directly connected; if the input of the temperature indicating instrument is 1 ~ 5V, it must be connected with an accuracy at the input of the temperature indicating instrument. More than one thousandth of a resistor with a resistance of 250Ω, and then connected to the transmitter;
4. If the insulation does not meet the requirements, the corresponding insulation treatment is required;
5 must ensure that the power supply to the transmitter ≥ 12V (that is, the transmitter power input voltage ≥ 12V)
6. If it does not comply with the appropriate measures, such as raising the supply voltage (but must be less than 36VDC), reducing the load, etc.;
7 such as open: a. can not bring other loads;
b. Switch to other recorders with input impedance ≤ 250Ω when not recorded
8. Equipment housing grounding;
9. Separate from AC power and other power sources;