Universal Head-Mount Temperature Transmitter (Configurable Input)

A. Product Overview

The Universal Head-Mount Temperature Transmitter (DIN Form B) converts multiple sensor inputs into a stable 2-wire 4–20 mA current loop output for industrial temperature measurement and control. It supports RTD (Pt100, Cu50), thermocouples (B, E, J, K, N, R, S, T), and resistance and mV inputs, making it suitable for standardizing different field signals into one common output signal used by panel meters, PLC, DCS and SCADA systems.

This head-mounted transmitter fits inside a standard connection head (Form B), reducing wiring complexity and improving signal integrity for long cable runs. Configuration is performed via PC, allowing selection of input type, measurement range and output behavior. For thermocouple measurement, it includes built-in cold junction compensation (CJC) to improve measurement reliability in changing ambient conditions.

B. Working Principle

The transmitter receives a sensor signal from an RTD, thermocouple, resistance sensor, or mV source and processes it electronically. The selected input is linearized and mapped to a 4–20 mA output proportional to the measured value across the configured range.

For thermocouple inputs, the transmitter applies cold junction compensation to correct the reference junction temperature effect. In a 2-wire loop, the same pair of conductors supplies power and carries the 4–20 mA signal to the receiving instrument, such as a panel indicator, PLC analog input module, or DCS I/O.C. Key Applications

• Converting RTD or thermocouple signals to 4–20 mA for temperature indication and control

• Head-mounted installation inside sensor connection heads (Form-B)

• Industrial loops requiring 2-wire 4–20 mA signal transmission to panel meters and automation systems

• Applications using Pt100, Cu50, or standard thermocouple types (B, E, J, K, N, R, S, T) within listed ranges

D. Why Industries Use This Product

A head-mount temperature transmitter standardizes multiple sensor types into a single industry-standard signal (4–20 mA). This improves noise immunity, reduces wiring complexity, and makes long-distance signal transmission more reliable. Fault alarm current output also improves maintenance visibility, helping detect sensor failure or open circuits during operation.

E. Suitable Buyers

• OEMs integrating temperature measurement in machines, skids and packaged systems
• EPC contractors standardizing instrumentation signals across plant projects
• Maintenance teams replacing or upgrading existing 4–20 mA temperature loops
• Plant engineering and procurement teams managing retrofit and standardization programs using DIN Form B assemblies

FAQ SECTION

1. What input sensors are supported by this head-mount temperature transmitter?
It supports RTD and thermocouple inputs, plus resistance and mV inputs. RTD options include Pt100 and Cu50. Thermocouple types include B, E, J, K, N, R, S and T. Input type is selectable via PC configuration.

2. What output signal does the transmitter provide and how is it wired?
It provides a 2-wire 4–20 mA output. The device is loop-powered and transmits the 4–20 mA signal on the same two conductors used for power.

3. What measuring ranges are supported for RTD and thermocouples?
Pt100 range is -200 to 850°C and Cu50 is -50 to 150°C. Thermocouple ranges are selectable per type; for example K is -180 to 1372°C and B is 400 to 1820°C.

4. What happens if the sensor is damaged or disconnected?
The transmitter outputs an alarm current of 3.9 mA or 22 mA depending on alarm direction (except for thermocouple inputs as specified), helping indicate sensor fault in the loop.

5. What are the accuracy and response time?
Accuracy is 0.1% FS and response time is ≤ 1 second. Accuracy depends on the configured range and input type.

6. What environmental limits and protection ratings are listed?
Operating temperature is -40 to 85°C and storage is -40 to 100°C. Protection is IP00 and IP66 when mounted.