-200C To 1300C Temperature Sensor 4 20ma Output RS485 RTD Transmitter

High-Performance Temperature Measurement Integrated Transmitter For Various Industries

Overview

The integrated temperature transmitter is a widely used measurement instrument in modern industry, capable of real-time measurement and monitoring of medium temperature changes. The integrated design of the temperature transmitter enhances measurement accuracy and system reliability to meet the needs of various industries. This product consists of three components: the temperature sensor, the transmitter, and the display. The temperature sensor, the core component for measuring temperature changes, utilizes various principles such as thermocouples and resistance thermometers. The transmitter converts the electrical signal from the sensor into a standard current or voltage signal and transmits it to the display or control device via cables. The display shows the measured temperature in real time and allows for further data processing and control.

Main Technical Specifications

Working Principle

A thermocouple or resistance thermometer sensor converts the measured temperature into an electrical signal, which is then sent to the transmitter. The transmitter contains circuits for zero adjustment and thermocouple compensation. After zero adjustment, the signal is input into an operational amplifier for signal amplification. The amplified signal is processed by a V/I converter and outputs as a 4-20mA DC current (the transmitter's linearization circuit uses two feedback methods. For resistance thermometer sensors, positive feedback is used for correction, and for thermocouple sensors, a multi-segment polyline approximation method is used for correction). Another path processes the signal through an A/D converter before displaying it on the meter.

Features

Sealed with silicone rubber or epoxy resin, making it shock-resistant, moisture-resistant, and suitable for harsh field environments;
Installed on-site within the junction box of thermocouples or resistance thermometers, directly outputting 4-20mA and 0-10V signals. This not only saves on the cost of expensive compensation wires but also enhances the anti-interference ability during long-distance signal transmission;
Thermocouple transmitters feature automatic cold-end temperature compensation;
High accuracy, low power consumption, wide operating temperature range, stable and reliable operation.