Temperature Measurement for Industrial Pipes: How to Achieve Stable Transmission of Temperature Signals

Temperature sensors are mounted on pipelines to capture medium-temperature data, which is then transmitted to control systems such as PLCs and DCS for process monitoring and equipment operation support.

Although temperature measurement seems straightforward, it involves multiple links including temperature acquisition, signal conversion and long-distance transmission. Especially in industrial sites, stable transmission of temperature signals is a key consideration for instrument selection.

① Long distance between measurement points and control cabinetsTemperature signals must travel over long cables, placing high demands on transmission stability.

② Electromagnetic interference from motors, frequency converters and other equipmentDense electrical equipment on-site may generate electromagnetic interference, which compromises signal quality and must be mitigated.

③ Diverse pipeline operating conditionsVariations in process media, temperature ranges, pipe diameters and mounting positions impose different requirements for temperature sensors and transmitters.

④ Integration requirements for automation systems. Temperature data needs not only local indication, but also reliable transmission to PLC / DCS platforms for centralized monitoring.

An integrated temperature transmitter combines the temperature sensing element and conversion module into one unit. The sensor captures medium temperature inside the pipeline, and the built-in module converts raw temperature readings into standard output signals.

Taking PT100 temperature measurement with 4-20 mA output as an example: Process Medium → PT100 Sensor → Transmitter Module → 4-20 mA Signal → PLC / DCS

The integrated design reduces extra on-site connection points. The standard 4-20 mA output ensures seamless compatibility with automation systems including PLC and DCS.

Measurement performance is directly determined by the transmitter's signal acquisition, conversion and calibration capabilities. Therefore, model selection shall comprehensively consider medium properties, temperature range, pressure rating, mounting method and environmental conditions.

Developed for industrial temperature measurement scenarios, Norhen integrated temperature transmitters are fully optimized for temperature acquisition, signal conversion and system integration. They are widely applicable to pipelines, process equipment, storage tanks and other measuring locations.

01｜High-precision AcquisitionEquipped with a 24-bit ADC with 18 effective bits and high-precision fitting algorithm, it delivers measurement accuracy up to 0.1%FS to meet industrial measurement requirements.

02 | 3-wire PT100 Input to Minimize Lead-wire Effect. Supports 3-wire PT100 connection with dual-channel constant-current excitation to reduce lead-wire resistance error. Fully digital calibration achieves a low temperature drift coefficient of 30 ppm/℃, eliminating errors caused by traditional analog adjustment.

03 | 2-wire 4-20 mA Output for Easy System Integration. 2-wire 4-20 mA output with 9-30 VDC power supply, easy to interface with PLC and DCS automation systems. It supports 5-unit conversion, 6 display modes, adjustable display resolution and factory-reset function for flexible on-site configuration.

04 | Enhanced Anti-interference Design for Harsh Industrial Environments. Reinforced circuit anti-interference performance ensures reliable signal acquisition and transmission amid motors, frequency converters and other interference sources. The compact integrated structure simplifies field installation and wiring for continuous temperature monitoring.

Norhen specializes in industrial process measurement, offering a complete portfolio including temperature transmitters, RTDs, thermocouples and bimetallic thermometers. Custom selections are available according to process media, temperature range, pressure rating, mounting style and output requirements.

For industrial pipelines, storage tanks, heat-exchange equipment and complex applications in chemical, energy, water-treatment and other industries, Norhen provides one-on-one free model selection, customized solutions, parameter verification, installation guidance and full-cycle after-sales service to deliver complete temperature-measurement solutions.

Different working conditions call for different solutions. Norhen delivers tailored temperature-measurement solutions for industrial sites.