TRH420
Precision USB temperature and relative humidity sensor
Temperature (°C): | -40 to 70 | ±0.1 |
Relative humidity (%RH): | 0 to 100 | ±1.5 |
Dew point: | Calculated in real-time |
- 2-layer filter
- Efficiency: >99.99% of particles as small as 200 nm
- RoHS3 and CE compliant
- 3 years warranty
PRODUCT OPTIONS
- 3-point user calibration mechanism (CAL option)
- COM communication (VCP option)
- Traceable to the CNRC (NIST) certificates
FREE DATA LOGGING AND MONITORING SOFTWARE
Learn more and download DracalView:
- Get up-and-running in less than 3 minutes
- Operates under Windows, Mac OS X and Linux
- Real-time on-screen graphing and logging
- Configurable log file format
- Log interval down to 0.5 second
- Configurable units (°C, °F, K…)
- Simultaneous use of unlimited Dracal sensors supported
- Simple user-calibration (products with the CAL option)
- Connectivity with SensGate Wi-Fi/Ethernet gateway
EASY TO INTEGRATE IN YOUR OWN APPLICATION
- One portal page to easily get started
- Easily switch between USB CLI and Wi-Fi/Ethernet CLI
- Code samples available for many programming languages
- Usable with LabView (Guide here)
All command-line tools (CLI) are packaged with DracalView












Description
TRH420: High-Precision USB Temperature and Relative Humidity Sensor.
The TRH420, a member of the TRH series, is a USB sensor designed for environmental temperature and relative humidity measurements, offering improved precision of ±0.1°C for temperature and ±1.5%RH for relative humidity. Its digitally calibrated, linearized, and factory-compensated sensor allows precise and interchangeable measurements, with a probe operating range of -40°C to 70°C. With a resolution of 0.015°C for temperature and 0.01%RH for relative humidity, it is ideally suited for applications requiring precise monitoring of these parameters. Its 1-meter USB cable and USB-powered operation provide excellent installation flexibility, while its robust design protects it against challenging environmental conditions.
Like all Dracal measurement instruments, the TRH420 is compatible with free software tools, making it an essential component of a DAQ solution. For those who wish to integrate the TRH420 into their system, there are two options available: command line tools and VCP mode. If you prefer a graphical interface, DracalView is the appropriate choice.
Easy to use in your applications
- Virtual COM option (VCP)
- dracal-usb-get: command-line data integration tool
- dracal-sensgate-get: command-line tool for wireless access to sensors connected to a SensGate
- RVCP: REST API for wireless access to VCP instruments connected to a SensGate
Multiple integration and code examples, including Python, C, C++, Java, Node.js, C#, Grafana and LabVIEW.
Free data monitoring and calibration software
Be instantly operational with DracalView: our free data visualization, logging and calibration software
- Works under Windows (Win7/8/10/11 64&32-bit), Mac OS X and Linux
- Simultaneous visualization and logging of an unlimited number of sensors
- Automatic synchronization with our Wi-Fi gateway
- Easy calibration mechanism open to the end-user
Application examples
- Use as a working reference
- Integration into a quality control system in production (Lumotive)
What is included
- One (1) TRH420 measuring instrument
- One (1) USB Cable
- Quick installation guide
- Data acquisition solution for DAQ system