Wall-Mount Temperature & Humidity Transmitter with External Sensor(Custom cable length)
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A. Product overview
This Wall-Mount Temperature and Humidity Transmitter with External Sensor is designed for continuous monitoring of relative humidity and temperature in industrial and commercial indoor environments. It measures 0–100% RH and 0–100°C and provides a standard 4–20 mA output for integration with PLCs, BMS/building automation controllers, DCS/SCADA, data loggers, and panel indicators.
A key advantage is the external sensor with customizable cable length (up to 10 m), allowing the sensing point to be placed at the correct location while the transmitter body remains mounted safely and conveniently. The unit is built for reliability with full isolation between the input power, measurement unit, and output signal, supporting stable performance in automation and facility monitoring applications.
B. Working principle
Remote sensing: The external sensor measures humidity and temperature at the installation point (for example inside a room, near an air stream, or at a specific monitoring location).
Signal conditioning: The transmitter processes the sensor signals, applies scaling and stabilization, and converts them into accurate RH and temperature values.
Electrical isolation: The power supply, measuring circuit, and output stage are electrically isolated to reduce interference, prevent ground loops, and improve safety and reliability in industrial installations.
4–20 mA output: The measured values are converted into a 4–20 mA signal used by automation systems for monitoring, trending, alarms, and control.
C. Why it is used
To monitor humidity and temperature continuously in communication rooms, warehouses, and automation facilities
To connect easily with PLC/BMS/DCS/SCADA systems using an industry-standard 4–20 mA signal
To place the sensor exactly where measurement is required using a remote probe and custom cable up to 10 m
To improve safety and reduce noise-related issues due to isolation between power and signal circuits
To support stable environmental conditions that protect equipment, materials, and process quality
To enable quick installation and reliable long-term operation in industrial monitoring setups
D. Suitable buyers
Building automation (BMS/BAS) integrators and HVAC contractors
Industrial automation integrators using PLC, SCADA, or DCS systems
Panel builders and system integrators for monitoring and control panels
Facility managers for warehouses, plants, and commercial buildings
Data center, server room, and telecom/communication room operators
OEMs requiring ambient RH/temperature feedback in machines or enclosures
Maintenance (MRO) teams responsible for environmental monitoring and equipment protection
FAQ
1. What is a wall-mount temperature and humidity transmitter with external sensor used for?
It measures humidity and temperature at a remote sensing point (external sensor) and sends the readings to a control or monitoring system using a standard output signal.
2. What output does it provide?
It provides a 4–20 mA output signal, commonly used for PLC/BMS/DCS/SCADA analog inputs due to good noise immunity and stable transmission.
3. What are the measurement ranges and accuracy?
Humidity: 0–100% RH, accuracy ±3% RH (default).
Temperature: 0–100°C, accuracy ±0.5°C (default).
4. What power supply is required?
It operates on 10–30 V DC, typically powered from a 24 V DC control panel supply.
5. What is the benefit of the external sensor and custom cable length?
It lets you mount the transmitter body where it is safe and accessible while placing the sensor at the best measurement point. Cable length can be customized up to 10 m.
6. Where is this transmitter commonly used?
Communication rooms, warehouses, building facilities, automation systems, and other indoor areas requiring continuous RH and temperature monitoring.
7. What does “power, measurement unit, and output are isolated” mean?
It means the power input and output circuitry are electrically separated, improving safety, reducing interference, and helping avoid ground loop problems in industrial installations.
8. Is it suitable for indoor industrial environments?
Yes. It is designed for typical indoor industrial conditions and is recommended for operating environments within 20°C to 80°C (as specified).