Temperature-Humidity Transmitter
Polwax RHT 150DM
Part Code. 0397
- Without Display
- Modbus RTU RS485
- Duct mounted
- Excellent linearity
- Wide sensing range
- Good long term stability
Polwax RHT-150DM is a duct-mount temperature and humidity transmitter designed for reliable environmental monitoring in HVAC ducts and air handling systems. It provides precise measurement of temperature and relative humidity with stable output signals such as 4-20 mA and RS485 Modbus communication, enabling seamless integration with building automation and control systems. Rugged construction and accurate sensing make the RHT-150DM ideal for maintaining optimal indoor air quality, energy efficiency, and climate control in commercial and industrial environments such as HVAC installations, warehouses, laboratories, and controlled spaces.
Product Overview
The Polwax RHT150 DM Series is a high‑performance duct‑mount temperature and humidity transmitter designed for precise and reliable environmental monitoring in HVAC systems, air handling units, and industrial ventilation applications. Built for seamless integration with building automation systems, the RHT150 DM delivers accurate real‑time measurements of temperature and relative humidity to help maintain optimal indoor air quality, energy efficiency, and climate control.
The series includes multiple variants to suit different application needs:
- RHT150 DM – Standard duct‑mount transmitter with reliable temperature and humidity sensing.
- RHT150 DM (HT) – Enhanced high‑temperature version for environments requiring extended temperature measurement range.
- RHT150 DM (HT+HA) – Advanced model combining high‑temperature capability with heat and airflow compensation functionality for demanding HVAC and controlled spaces.
With rugged construction, flexible output options, and exceptional measurement stability, the RHT150 DM Series is ideal for commercial buildings, industrial facilities, laboratories, clean rooms, and other conditioned environments requiring accurate and dependable climate data.
The RHT150 DM is a duct-mount temperature and humidity transmitter designed for accurate environmental monitoring in HVAC and air handling systems.
The HT variant of the RHT150 DM offers enhanced high-temperature measurement capability, making it suitable for environments where temperature ranges exceed standard operating limits while still providing accurate humidity data.
The HT+HA version combines high-temperature measurement with heat and airflow compensation features, delivering advanced sensing performance for demanding HVAC applications and critical climate-controlled environments.
Applications
Agriculture & Greenhouses
The RHT50 WM and RHT100 WM temperature & humidity transmitters help maintain optimal climate conditions in agricultural fields and greenhouse environments. By accurately monitoring temperature and humidity levels, these devices ensure healthy plant growth, prevent crop stress, and improve yield
Pharmaceutical
In pharmaceutical environments, the RHT50 WM and RHT100 WM temperature & humidity transmitters provide precise monitoring of critical climate conditions required for drug storage and production. Accurate humidity and temperature control ensures product integrity, compliance with regulatory standards, and a stable environment for sensitive materials.
Storage & Warehouse
In storage and warehouse environments, the RHT50 WM and RHT100 WM temperature & humidity transmitters ensure accurate monitoring of climate conditions that directly affect stored goods. By maintaining optimal temperature and humidity levels, these devices help prevent spoilage, protect packaging integrity, and reduce losses.
Food & Beverage
In food and beverage environments, the RHT50 WM and RHT100 WM temperature & humidity transmitters help maintain precise climate control essential for product quality and safety. Accurate monitoring of temperature and humidity prevents spoilage, preserves freshness, and ensures compliance with industry standards throughout processing, storage, and distribution.
HVAC
In HVAC systems, the RHT50 WM and RHT100 WM temperature & humidity transmitters provide reliable monitoring of indoor climate conditions to ensure comfort, energy efficiency, and system performance. Accurate temperature and humidity data helps optimize airflow, reduce energy consumption, and maintain ideal environmental levels in commercial and residential spaces.
Clean Rooms
In clean room environments, the RHT50 WM and RHT100 WM temperature and humidity transmitters ensure precise control of critical environmental conditions. Accurate monitoring helps maintain required cleanliness standards, prevent contamination, and support compliance with regulatory norms.The RHT100 WM’s built-in display enables quick on-site verification of real-time readings.
Technical Data
| Media Compatibility | Air, non-combustible, non-corrosive gases |
| Model No |
RHT150 DM / RHT150 DM / RHT150 DM (HT) / RHT150 DM (HT+HA) |
| Part Code |
0397 2030 / 0397 2031 / 0397 2032 / 0397 2033 |
| Measuring Range |
T: -40 to 85 °C & RH: 0–100% / T: 0 to 100 °C & RH: 0–100% / T: -40 to 125 °C & RH: 0–100% / T: -40 to 125 °C & RH: 0–100% |
| Accuracy |
T: 0.4 °C & RH: 1.8% / T: 0.4 °C & RH: 1.8% / T: 0.4 °C & RH: 1.8% / T: 0.1 °C & RH: 0.8% |
| Display | Without Display |
| Inputs | Temperature & Humidity |
| SS Probe Length | 150 mm |
| Dimensions | 75 × 35 × 75 mm |
| Protection Class | IP54 |
| Mounting | Duct Mount |
| Language | English |
| Supply Voltage | 24V DC |
| Output | 4–20mA, RS485 MODBUS RTU / 0–10V (Optional) |
| Scope of Supply | Calibration Certificate, GUI Software, Manual |
Temperature & Humidity Transmitter – RHT 150DM Series
The Polwax RHT 150DM series duct-mount temperature and humidity transmitters are designed for precise environmental monitoring in HVAC systems, clean rooms, pharmaceutical facilities, storage, and industrial applications. With high accuracy, stainless steel sensors, and multiple output options, the RHT 150DM ensures reliable climate control and process efficiency.
Model Variants
RHT150 DM – Standard /
RHT150 DM – Standard /
RHT150 DM (HT) – High Temp /
RHT150 DM (HT+HA) – High Temp + High Accuracy
Duct Mount Design
Compact duct-mount enclosure for easy installation and integration in HVAC and industrial systems.
Accurate Monitoring
Temperature range: -40°C to 125°C, Humidity: 0–100% RH with high precision.
Stainless Steel Sensor
150mm SS probe with robust filter ensures long-term stability and reliable readings.
Industrial Output Options
Supports 4–20mA, RS485 Modbus RTU, and optional 0–10V outputs for automation systems.
Reliable Protection
IP54-rated enclosure ensures safe operation in industrial environments.
24V DC Supply
Designed for continuous operation with standard 24V DC power supply.
Complete Package
Includes calibration certificate, GUI software, SS adaptor, and detailed user manual.
