On Site Display Isolated Temperature Transmitter For Power / Energy Industry

The on-site display isolated temperature transmitter can achieve measurement, display and transmission under isolation protection. The on-site display isolated temperature transmitter is an instrument integrating four major functions: temperature sensing, electrical isolation, signal transmission and on-site display.

1. 1. Eliminating Ground Loop Interference (Most Common):

   Problem: When the ground potentials of multiple devices in a system are different, a "ground loop" is formed, generating a circulating current (noise current) that superimposes on the signal, causing the measured value to fluctuate and be inaccurate.

   Solution: The isolator cuts off the ground loop, ensuring a "clean" signal.

2. 2. Protecting Expensive Equipment from Surge and High Voltage Damage:

   Problem: Field sensors may introduce high voltage surges due to lightning strikes, static electricity, power failures, or incorrect wiring. Without isolation, the high voltage can travel along the signal line into the control system (DCS/PLC cards), causing catastrophic damage.

   Solution: The isolator provides an isolation voltage of up to 1500V AC or higher, blocking dangerous voltages on the safe side and protecting the equipment on the control system side.

3. 3. Providing Power to Sensors and Handling Different Signal Types:

   Problem: Two-wire transmitters require power supply; different signal types (such as thermocouples, thermal resistors, voltages) need to be compatible.

   Solution: The isolator integrates an isolated power supply internally and provides dedicated input circuits for different sensors, achieving an integrated solution for signal conversion and isolation.

1. System Security Guardian: Isolates high voltage to protect core control systems such as DCS/PLC at the back end, preventing large-scale card damage and production interruption caused by on-site faults, and saving huge maintenance costs and production losses.
2. Measurement Accuracy Defender: Completely eliminates ground loop interference and common mode noise, providing stable and accurate measurement signals and improving control quality.
3. More Flexible System Design: Allows different grounding references on the field side (sensors) and the control system side, solving the problem of inconsistent potentials in complex systems.
4. Simplified Wiring and Configuration: Built-in isolation power supply can directly power two-wire transmitters; compatible with multiple sensor input types, reducing peripheral devices.
5. Local Monitoring and Diagnosis: The on-site display window can simultaneously show temperature values and output current values (or percentages), facilitating quick determination of whether the issue is on-site (abnormal temperature display) or in signal transmission (normal display but incorrect current output).

1. Power and energy industry: Temperature monitoring of generator windings, transformers, and high-voltage switch cabinets.
2. Chemical and hazardous areas: Temperature measurement in explosion-proof areas.
3. Long-distance transmission or complex grounding systems: Large factory areas with scattered equipment and significant ground potential differences.
4. Critical equipment and high-value control loops: Temperature control of main reactors and large compressors.
5. Factories with multiple signal types: Factories that have both thermocouples and thermal resistors, as well as 4-20mA signals from other systems that need to be integrated into the same DCS.

The on-site display isolated temperature transmitter is a high-level solution that combines "functional integration" and "system safety" in industrial temperature measurement. It is not merely a measuring instrument but also a system-level protection device and signal conditioning center.