Temperature & Humidity Sensor
MTH40 is a wall-mounted temperature and humidity sensor with RS485 Modbus output. Perfect for indoor climate control, HVAC systems, and VFD-driven fans, providing accurate measurements for optimal air quality and energy efficiency.
Applications:
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Indoor climate control systems
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HVAC fan and AHU integration
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Food storage and transportation
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Museums and archives for artifact preservation
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Greenhouses and pharmaceutical laboratories
Description
The MTH40 Temperature & Humidity Sensor is a high-precision wall-mounted sensor designed for indoor climate monitoring and control. With industrial-grade components and RS485 Modbus communication, it integrates seamlessly with HVAC systems, VFD-controlled fans, and building automation systems.
This sensor ensures accurate temperature and humidity measurements, enabling demand-controlled ventilation and energy-efficient operation in commercial, industrial, and pharmaceutical environments.
Why Choose MTH40:
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Reliable and precise sensor for professional applications
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Durable IP65-rated wall-mounted design for indoor or semi-exposed environments
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RS485 Modbus output ensures easy integration with VFDs, PLCs, and building management systems
Features
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High-precision temperature and humidity measurement
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Durable wall-mounted IP65 housing, resistant to dust and moisture
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RS485 Modbus output, supporting secondary development and long-distance communication up to 2000 m
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Low power consumption (0.4 W) and wide DC voltage range (10–30 V)
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Particle-sintered probe sheath for durability and aesthetics
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Long-term stability: ±0.1°C/year for temperature, ≤1% RH/year for humidity
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Suitable for HVAC, VFD fans, building automation, and indoor air quality monitoring
Specification
| Parameter | Specification |
|---|---|
| Model | MTH40 |
| Sensor Type | Temperature & Humidity |
| Measurement Range | Temperature: -40°C ~ +120°C (probe), Humidity: 0–100% RH |
| Accuracy | Temperature: ±0.5°C, Humidity: ±3% RH (5–95% RH, 25°C) |
| Long-Term Stability | Temperature ≤0.1°C/year, Humidity ≤1% RH/year |
| Output Signal | RS485 Modbus |
| Power Supply | 10–30 V DC |
| Max Power Consumption | 0.4 W |
| Protection Grade | IP65 |
| Working Temperature | Transmitter circuit: -40°C~+60°C, 0%RH~80%RH; Probe: -40°C~+120°C |
| Mounting | Wall-mounted |
| Communication Distance | Up to 2000 m |
| Applications | HVAC, Indoor Climate Control, VFD-driven Fans, Building Automation |
FAQ
1. What is the MTH40 temperature and humidity sensor used for?
The MTH40 is designed for indoor climate monitoring and control. It is commonly used in HVAC systems, ventilation, air handling units (AHUs), and building automation systems, especially where VFD-controlled fans are used to optimize air quality and energy efficiency.
2. Can the MTH40 be used with frequency inverters (VFDs)?
Yes. The MTH40 provides an RS485 Modbus output, which allows it to be integrated with VFDs, PLCs, and building management systems. It is ideal for applications such as temperature- or humidity-based fan speed control and demand-controlled ventilation.
3. Is the MTH40 suitable for industrial and professional applications?
Absolutely. The sensor uses industrial-grade electronic components, offers high measurement accuracy, and features an IP65-rated enclosure, making it suitable for commercial, industrial, and laboratory environments.
4. How is the MTH40 installed?
The MTH40 is a wall-mounted sensor. It is designed for easy installation in indoor spaces such as:
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Technical rooms
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Offices and commercial buildings
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HVAC ducts and ventilation areas
Its compact design allows fast commissioning during HVAC or retrofit projects.
5. What communication protocol does the MTH40 use?
The sensor uses RS485 communication with Modbus protocol, a widely accepted standard in HVAC, industrial automation, and VFD applications. This ensures reliable data transmission over long distances (up to 2000 m).
6. How accurate are the temperature and humidity measurements?
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Temperature accuracy: ±0.5 °C (at 25 °C)
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Humidity accuracy: ±3% RH (5–95% RH at 25 °C)
The MTH40 also offers excellent long-term stability, ensuring reliable readings over years of operation.
7. Can the MTH40 operate in harsh environments?
Yes. With an IP65 protection rating, the MTH40 is protected against dust and moisture. It can operate reliably in environments with high humidity, temperature variations, and demanding indoor conditions.
8. What power supply does the MTH40 require?
The sensor operates on a 10–30 V DC power supply and consumes very low power (maximum 0.4 W), making it suitable for continuous operation in building automation and HVAC systems.
9. Is the MTH40 compatible with building management systems (BMS)?
Yes. Thanks to its RS485 Modbus output, the MTH40 can be easily integrated into most BMS, SCADA systems, PLCs, and VFD control panels commonly used in commercial and industrial buildings.
10. Why choose the MTH40 over simpler temperature or humidity sensors?
The MTH40 combines:
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Temperature and humidity measurement in one device
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Industrial accuracy and long-term stability
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Professional communication (RS485 Modbus)
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Robust IP65 housing
This makes it a reliable professional solution rather than a basic consumer sensor, especially for energy-efficient HVAC and VFD-controlled systems.
