Temperature transmitter module advantages:
â– 1ã€Unaffected by the effects of parasitic thermocouple and wire resistance drop and temperature drift, the transmission line can use very cheap and finer twisted pair wire;
â– 2. When the output resistance of the current source is large enough, the voltage in the wire loop is sensed by the magnetic field coupling and will not have a significant impact. Because the current caused by the interference source is extremely small, the twisted-pair wire can be used to resist the interference reduction.
■3. Capacitive interference will cause receiver-resistor-related errors. For 4- to 20-mA two-wire loops, the receiver resistance is typically 250Ω (sampling Uout = 1 to 5V). This resistance is small enough to produce significant errors. Therefore, The allowable length of wire is longer and farther than the voltage telemetry system;
â– 4. Each single reading device or recording device can switch between different channels with different lengths of wire, which is not caused by the difference in the accuracy of the length of the wire;
â– 5, 4mA is used for zero level, making it easy to judge open circuit or sensor damage (0mA state).
â– 6, in the two-wire output port is easy to add anti-surge and lightning protection devices, is conducive to safety lightning explosion.
Use cautions:
The power supply of the temperature transmitter must not have spikes. The calibration of the transmitter should be performed after 5 minutes of power up, and the ambient temperature should be taken into consideration. Do not open the cover of the digital display transmitter freely to avoid moisture. The enclosure should be firmly grounded, and the power and signal output should be transmitted using shielded cables. The pressure nuts should be tightened to ensure airtightness. Be sure to tighten the nut with a wrench or other tool during installation. Do not twist the meter by hand to prevent the internal wiring from being twisted. To adjust the display orientation, loosen the “headscrews†on both sides and gently turn them to the proper position (not to exceed 270°C), then tighten the screws.
â– 1ã€Unaffected by the effects of parasitic thermocouple and wire resistance drop and temperature drift, the transmission line can use very cheap and finer twisted pair wire;
â– 2. When the output resistance of the current source is large enough, the voltage in the wire loop is sensed by the magnetic field coupling and will not have a significant impact. Because the current caused by the interference source is extremely small, the twisted-pair wire can be used to resist the interference reduction.
■3. Capacitive interference will cause receiver-resistor-related errors. For 4- to 20-mA two-wire loops, the receiver resistance is typically 250Ω (sampling Uout = 1 to 5V). This resistance is small enough to produce significant errors. Therefore, The allowable length of wire is longer and farther than the voltage telemetry system;
â– 4. Each single reading device or recording device can switch between different channels with different lengths of wire, which is not caused by the difference in the accuracy of the length of the wire;
â– 5, 4mA is used for zero level, making it easy to judge open circuit or sensor damage (0mA state).
â– 6, in the two-wire output port is easy to add anti-surge and lightning protection devices, is conducive to safety lightning explosion.
Use cautions:
The power supply of the temperature transmitter must not have spikes. The calibration of the transmitter should be performed after 5 minutes of power up, and the ambient temperature should be taken into consideration. Do not open the cover of the digital display transmitter freely to avoid moisture. The enclosure should be firmly grounded, and the power and signal output should be transmitted using shielded cables. The pressure nuts should be tightened to ensure airtightness. Be sure to tighten the nut with a wrench or other tool during installation. Do not twist the meter by hand to prevent the internal wiring from being twisted. To adjust the display orientation, loosen the “headscrews†on both sides and gently turn them to the proper position (not to exceed 270°C), then tighten the screws.
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