Duct-Mount Temperature and Humidity Transmitter with Display

A. Product overview

This Temperature & Humidity Transmitter is a compact monitoring device designed for continuous measurement of ambient 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 signal for integration with PLCs, BMS/building automation controllers, DCS/SCADA systems, data loggers, and panel indicators. Built for reliability, it features complete isolation between power input, the measurement unit, and the output signal, making it suitable for communication rooms, warehouses, and automation control applications where stable monitoring is required.

Key specifications: 10–30 VDC supply, 0–100% RH (±3% RH), 0–100°C (±0.5°C), operating environment 20–80°C, 4–20 mA output.

B. Working principle

1. Sensing: The transmitter continuously senses humidity and temperature from the surrounding air using internal sensing elements.

2. Signal processing: The internal electronics condition, linearize, and scale the sensor signals to produce stable measurement values.

3. Electrical isolation: The power supply, measurement circuitry, and output stage are isolated to improve safety, reduce electrical interference, and protect connected automation systems.

4. Output conversion: The measured values are converted into a 4–20 mA signal, which is widely used in industrial automation due to its noise resistance and suitability for longer cable runs.

C. Why it is used

• Continuous temperature and humidity monitoring for warehouses, communication rooms, and automation areas

• Reliable signal output to PLC/BMS systems for monitoring, alarms, logging, and control actions

• Improved safety and reduced noise issues due to isolation between power and signal circuits

• Helps maintain stable environmental conditions that protect equipment, stored materials, and process quality

• Easy installation and clean design for quick deployment in industrial panels and facility monitoring

D. Suitable buyers

• Building automation (BMS/BAS) integrators and HVAC control contractors

• Industrial automation integrators using PLC, DCS, or SCADA

• Panel builders and system integrators for monitoring and control systems

• Facility management teams for warehouses, plants, and commercial buildings

• Data center, server room, telecom and communication room operators

• OEMs needing ambient humidity and temperature feedback for machines or enclosures

• Maintenance (MRO) teams responsible for environmental monitoring and equipment protection

FAQ

1. What is a temperature and humidity transmitter used for?
It measures ambient temperature and relative humidity and sends the readings to an automation or monitoring system for continuous tracking, alarms, and control.

2. What is the output signal of this transmitter?
It provides a 4–20 mA output signal, commonly used in industrial automation and building management systems because it is stable and resistant to electrical noise.

3. What are the measurement ranges?
Humidity range is 0–100% RH. Temperature range is 0–100°C.

4. What accuracy can I expect?
Humidity accuracy is ±3% RH (default) and temperature accuracy is ±0.5°C (default).

5. What power supply does it require?
It operates on 10–30 VDC, making it suitable for typical 24 VDC control panels.

6. Where is this transmitter typically installed?
It is commonly used in communication rooms, warehouses, building facilities, and automation control areas that require temperature and humidity monitoring.

7. Can it be connected to PLC, BMS, DCS, or SCADA?
Yes. The 4–20 mA output can be read by PLC analog input modules, BMS controllers, DCS/SCADA systems, and data loggers.

8. What does “power, measurement, and output are isolated” mean?
It means the power input, measurement circuitry, and signal output are electrically separated, improving safety and reducing interference or ground loop issues in industrial installations.