Wall-Mount Temperature Transmitter with In-Built RTD Sensor

A. Product Overview

This Wall-Mount PT100 Temperature Transmitter converts a PT100 RTD (resistance thermometer) input into a stable, industry-standard 2-wire 4–20 mA analog output for remote temperature monitoring and control. It is designed for field installation in a wall-mount enclosure where a reliable current loop signal is required for connection to PLC, DCS, SCADA, panel meters, data loggers, and building automation systems.

The transmitter is PT100 input only and is supplied with a fixed (factory-set) configuration, making it suitable for standardized installations and direct replacement of existing PT100-to-4–20 mA transmitter points.

B. Working Principle

A PT100 RTD changes its resistance in proportion to temperature. The transmitter measures the PT100 resistance and converts it into a linear 4–20 mA output corresponding to the configured temperature range.

The device is loop-powered, meaning the same two wires supply power and carry the 4–20 mA signal. Output protection and diagnostic behavior are defined to support stable operation and easier fault detection:

aturation current (low): 3.9 mA

Saturation current (high): 20.5 mA

Alarm current (sensor fault / sensor off): 3.9 mA or 22 mA

Output circuit limit: ≤ 22 mA

Response time: ≤ 1 second

This alarm behavior helps identify open sensor conditions or sensor damage within the current loop.

C. Key Applications

Converting PT100 RTD temperature into 4–20 mA for remote indication and control

Industrial 2-wire current loop temperature transmission to PLC/DCS/panel meters

Wall-mounted installations in plant areas, utility rooms, skids and machines

Replacement and retrofit of existing PT100 transmitter points with fixed configuration

Standardized installations where field configuration is not required

D. Why Industries Use This Product

Industries use PT100 to 4–20 mA transmitters to standardize temperature measurement into the most widely accepted analog signal for instrumentation. A 4–20 mA loop is robust for industrial environments, supports long cable runs, and is compatible with most automation and monitoring systems.

This transmitter is specified with accuracy of 0.1% FS and response time ≤ 1 second and includes defined saturation and alarm current output to indicate sensor faults. Protection is specified as IP00 (device) and IP66 when mounted, supporting field use when installed in an appropriate enclosure.

E. Suitable Buyers

OEMs using PT100 sensing and requiring a wall-mount transmitter with 2-wire 4–20 mA output

EPC contractors standardizing PT100 temperature points into current loops

Maintenance and utilities teams replacing existing PT100 transmitter installations

Plant engineering and procurement teams preferring fixed (factory-set) units for repeatable installation and retrofit projects

FAQ SECTION

1. What sensor input does this wall mount transmitter support?

It supports PT100 RTD input only.

2. What output signal does the transmitter provide?

It provides a 2-wire 4–20 mA analog output.

3. Is the transmitter configurable in the field?

No. It is supplied with a fixed (factory-set) configuration as required.

4. What is the power supply range?

The specified power supply range is 12 V to 40 V.

5 . What are the response time and accuracy specifications?

Response time is ≤ 1 second and accuracy is 0.1% of full scale (FS).

6. What are the output limits and alarm behavior?

Output circuit limit is ≤ 22 mA. Saturation current is 3.9 mA (low) and 20.5 mA (high). Alarm current for sensor damage or sensor turn-off is 3.9 mA or 22 mA.

7. What protection rating is listed?

Protection is specified as IP00, and IP66 when mounted.