Precision Environmental Monitoring
The POLWAX RHT400 DM is a high-performance duct-mounted Temperature & Humidity Transmitter designed for accurate and dependable environmental monitoring in HVAC, cleanrooms, pharmaceutical, food, warehouse and industrial applications. Its extended 400 mm stainless-steel probe provides deeper sensing inside ducts and demanding installation environments.
Advanced Temperature & Humidity Monitoring
The POLWAX RHT400 DM Temperature & Humidity Transmitter is a high-performance environmental monitoring solution designed for industrial, commercial and building automation systems.
The transmitter measures temperature and relative humidity using a 400 mm stainless-steel probe, making it suitable for duct-mounted applications where the sensing point needs to extend deeper into an air stream or controlled environment.
The RHT400 DM series offers multiple temperature configurations, from -40 to 85°C and 0 to 100°C versions through high-temperature -40 to 125°C variants. The HT+HA version provides improved accuracy of ±0.1°C and ±0.8% RH.
With 4–20mA and RS485 MODBUS RTU outputs, plus optional 0–10V output, the transmitter can be integrated with compatible HVAC, automation, building-management and industrial monitoring systems.
RHT400 DM
Standard duct-mounted configuration with temperature measurement from -40 to 85°C and humidity measurement from 0–100% RH.
RHT400 DM
Standard configuration with temperature measurement from 0 to 100°C and humidity measurement from 0–100% RH.
RHT400 DM (HT)
High-temperature configuration with a temperature measuring range of -40 to 125°C and 0–100% RH humidity measurement.
RHT400 DM (HT+HA)
High-temperature and high-accuracy configuration with -40 to 125°C measurement and improved accuracy of ±0.1°C and ±0.8% RH.
RHT400 DM Series Specifications
Technical specifications for the POLWAX RHT400 DM Temperature & Humidity Transmitter series.
| Specification |
RHT400 DM
0397 4030 |
RHT400 DM
0397 4031 |
RHT400 DM (HT)
0397 4032 |
RHT400 DM (HT+HA)
0397 4033 |
|---|---|---|---|---|
| Media Compatibility | Air, non combustible, non corrosive gases | |||
| Model No | RHT400 DM | RHT400 DM | RHT400 DM (HT) | RHT400 DM (HT+HA) |
| Part Code | 0397 4030 | 0397 4031 | 0397 4032 | 0397 4033 |
| 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 | 400 mm | |||
| Dimensions | 75 × 35 × 75 mm | |||
| Protection Class | IP54 | |||
| Mounting | Duct Mount | |||
| Language | English | |||
| Supply Voltage | 24VDC | |||
| Output |
4–20mA, RS485 MODBUS RTU
0–10V Optional |
|||
| Scope Of Supply | Calibration Certificate, GUI Software, SS Adaptor, Manual | |||
Precision Measurement for Demanding Environments
The RHT400 DM combines accurate temperature and humidity measurement with an extended 400 mm stainless-steel probe and industrial communication outputs for reliable environmental monitoring.
Temperature Measurement
Depending on the selected configuration, temperature measurement is available from -40°C to 85°C, 0°C to 100°C or -40°C to 125°C.
Relative Humidity
Measures relative humidity across the complete 0–100% RH range for continuous environmental monitoring and climate control.
400 mm Stainless Steel Probe
The extended 400 mm stainless-steel probe is designed for duct-mounted sensing where deeper insertion into the air stream is required.
High Accuracy Option
The RHT400 DM (HT+HA) configuration provides improved accuracy of ±0.1°C for temperature and ±0.8% RH for humidity.
MODBUS RTU Communication
RS485 MODBUS RTU communication supports integration with compatible HVAC, building-management, automation and industrial systems.
Long-Term Stability
The RHT400 DM is designed for dependable environmental measurement with good linearity, stable sensing performance and reliable long-term operation.
Engineered for Reliable Environmental Monitoring
The POLWAX RHT400 DM combines an extended 400 mm stainless-steel probe, flexible temperature ranges, high measurement accuracy and industrial communication for demanding monitoring applications.
High Measurement Accuracy
The HT+HA configuration provides temperature accuracy of ±0.1°C and humidity accuracy of ±0.8% RH.
Multiple Temperature Ranges
Choose from -40 to 85°C, 0 to 100°C or -40 to 125°C temperature measuring ranges according to application requirements.
0–100% RH Measurement
Full relative humidity measurement range supports continuous environmental and climate monitoring.
400 mm SS Probe
The extended 400 mm stainless-steel probe provides deeper sensing inside ducts and other suitable environmental measurement locations.
RS485 MODBUS RTU
RS485 MODBUS RTU communication enables integration with compatible industrial monitoring and automation systems.
4–20mA Output
The 4–20mA output supports connection with compatible industrial controllers, monitoring systems and automation equipment.
Optional 0–10V
An optional 0–10V output provides additional flexibility for compatible HVAC and control applications.
IP54 Protection
The IP54-rated enclosure provides suitable protection for indoor HVAC, commercial and industrial environmental monitoring installations.
Duct-Mount Construction
The duct-mounted design is suitable for measuring environmental conditions in air-handling and ventilation systems.
Easy Integration & Configuration
The POLWAX RHT400 DM is designed for straightforward integration into temperature and humidity monitoring systems. Its industrial output interfaces allow connection to compatible controllers, HVAC systems, automation systems and environmental monitoring platforms.
The supplied GUI software supports transmitter configuration and range selection, helping users configure the transmitter according to application requirements.
- GUI Configuration Software
- 4–20mA Industrial Output
- RS485 MODBUS RTU Communication
- Optional 0–10V Output
- 24VDC Industrial Supply
- Temperature & Humidity Measurement
- 400 mm Stainless Steel Probe
- Stainless Steel Adaptor Included
- Calibration Certificate Included
- Instruction Manual Included
Extended Probe. Reliable Measurement.
The 400 mm stainless-steel probe allows the RHT400 DM to measure temperature and humidity at suitable sensing points deeper inside ducts and air-handling systems.
Suitable for HVAC, pharmaceutical, cleanroom, food & beverage, warehouse, agriculture and industrial environmental monitoring applications.
Temperature & Humidity Monitoring Across Industries
The RHT400 DM is suitable for applications where accurate temperature and humidity measurement is important for climate control, process quality, equipment performance and environmental management.
HVAC Systems
Monitor temperature and humidity inside air-handling, ventilation and climate-control systems for reliable environmental management.
Pharmaceutical
Support environmental monitoring in pharmaceutical manufacturing, storage and controlled production environments.
Clean Rooms
Monitor critical temperature and humidity conditions in cleanrooms and controlled production areas.
Storage & Warehouse
Monitor environmental conditions in warehouses, storage facilities and distribution areas to help maintain suitable conditions.
Food & Beverage
Monitor temperature and humidity in food processing, production and storage environments.
Agriculture & Greenhouses
Monitor environmental conditions in agricultural and greenhouse applications where climate control is important.
Industrial Automation
Integrate environmental measurement into industrial monitoring, process control and automation systems.
Building Management
Support building-management and facility-monitoring systems with reliable temperature and humidity data.
Laboratories
Provide continuous environmental measurement for laboratories and controlled testing environments.
Product Resources
Access technical documentation and contact POLWAX for quotation and technical assistance.
Reliable Temperature & Humidity Monitoring
The POLWAX RHT400 DM series combines accurate temperature and humidity measurement, a 400 mm stainless-steel probe, duct-mounted installation, 4–20mA and RS485 MODBUS RTU outputs, optional 0–10V output and flexible temperature configurations for demanding environmental monitoring applications.