Monocrystalline Silicon Pressure Transmitter is used to measure the liquid level, density, pressure of liquid, gas or steam, and then convert it into a 4-20mA HART current signal output, also with BST9900, HART375 or BST Modem communicate with each other through them for parameter setting and process control.
Fault check Transmitter measurement section
Remove the flange and check the isolation diaphragm of the sensitive part for deformation, damage and oil leakage.
Remove the compensating plate, do not take out the sensitive components, check the insulation resistance of the plug for the housing, and the insulation resistance should not be less than 100MΩ when the voltage does not exceed 100V.
Turn on the circuit and the gas circuit. When the pressure signal is the upper limit of the range, turn off the air supply, and the output voltage and reading value should be stable. If the output voltage drops, the transmitter has a leak and the leak can be detected with soapy water. [4]
Check the circuit part 1. Turn on the power and check the status of the voltage signal at the output of the transmitter. If there is no output voltage, first check whether the power supply voltage is normal; whether it meets the power supply requirements; there is no wiring error between the power supply and the transmitter and load equipment. If there is no voltage on the transmitter terminal or the polarity is reversed, the transmitter can output no voltage signal. If the above reasons are excluded, the component in the amplifier board circuit should be further inspected for damage; if there is no contact failure in the circuit board connector, the method can be used to determine the fault by comparing the measured voltage of the normal meter with the measured voltage corresponding to the faulty meter. Point, replace the faulty amplifier board if necessary. When checking the flow type transmitter, special attention should be paid to the J type amplifier board to take anti-static measures.
2. Turn on the power. After the input pressure signal is given, if the transmitter output is too high (greater than 10VDC), or the output is too low (less than 2.0VDC), and the input pressure signal is changed and the zero point and span screw are adjusted, the output is No reaction. For such faults, in addition to checking the sensor for sensitive parts of the transmitter, check whether the "Oscillation Control Circuit Part" on the transmitter amplifier board is working properly. The normal peak voltage between the high-frequency transformer T1-12 should be 25~35VP-P; the frequency is about 32kHz. Next, check the operation status of each operational amplifier on the amplifier board; whether the components of each part have damage or not. This type of fault requires the replacement of the amplifier board.
3, the transmitter in the line design and process assembly quality requirements are very strict, in the actual use of the line faults, after inspection and confirmation, contact the manufacturer to replace the faulty circuit board to ensure the long-term stability of the instrument And reliability.
Remove the flange and check the isolation diaphragm of the sensitive part for deformation, damage and oil leakage.
Remove the compensating plate, do not take out the sensitive components, check the insulation resistance of the plug for the housing, and the insulation resistance should not be less than 100MΩ when the voltage does not exceed 100V.
Turn on the circuit and the gas circuit. When the pressure signal is the upper limit of the range, turn off the air supply, and the output voltage and reading value should be stable. If the output voltage drops, the transmitter has a leak and the leak can be detected with soapy water. [4]
Check the circuit part 1. Turn on the power and check the status of the voltage signal at the output of the transmitter. If there is no output voltage, first check whether the power supply voltage is normal; whether it meets the power supply requirements; there is no wiring error between the power supply and the transmitter and load equipment. If there is no voltage on the transmitter terminal or the polarity is reversed, the transmitter can output no voltage signal. If the above reasons are excluded, the component in the amplifier board circuit should be further inspected for damage; if there is no contact failure in the circuit board connector, the method can be used to determine the fault by comparing the measured voltage of the normal meter with the measured voltage corresponding to the faulty meter. Point, replace the faulty amplifier board if necessary. When checking the flow type transmitter, special attention should be paid to the J type amplifier board to take anti-static measures.
2. Turn on the power. After the input pressure signal is given, if the transmitter output is too high (greater than 10VDC), or the output is too low (less than 2.0VDC), and the input pressure signal is changed and the zero point and span screw are adjusted, the output is No reaction. For such faults, in addition to checking the sensor for sensitive parts of the transmitter, check whether the "Oscillation Control Circuit Part" on the transmitter amplifier board is working properly. The normal peak voltage between the high-frequency transformer T1-12 should be 25~35VP-P; the frequency is about 32kHz. Next, check the operation status of each operational amplifier on the amplifier board; whether the components of each part have damage or not. This type of fault requires the replacement of the amplifier board.
3, the transmitter in the line design and process assembly quality requirements are very strict, in the actual use of the line faults, after inspection and confirmation, contact the manufacturer to replace the faulty circuit board to ensure the long-term stability of the instrument And reliability.
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