Extech RH520A Chart Recorder
The Extech RH520A is a versatile chart recorder designed for accurate humidity and temperature monitoring in industrial and laboratory environments. This graphical data logger provides simultaneous numerical and graphical display of measurements, along with dew point calculation, making it an essential tool for HVAC, cleanroom, and process monitoring applications.
Key Features & Highlights
- Graphical data logging: Displays humidity and temperature readings both numerically and graphically on a large dual LCD.
- Wide measurement range: Measures humidity from 10 to 95% RH and temperature from -20.0°F to 140.0°F (-28.9°C to 60.0°C), with basic accuracy of ±3% RH and ±1.8°F/1°C.
- Dew point calculation: Automatically calculates and displays dew point based on measured humidity and temperature.
- High memory capacity: Stores up to 49,000 data points internally, with LCD indication of remaining memory.
- PC connectivity: Transfer data to a PC via RS-232 serial port or USB adapter for further analysis using included LabView-based software.
- Adjustable resolution: Vertical and horizontal TAC resolution can be adjusted for optimal graph viewing.
- Complete package: Includes built-in stand, detachable probe with 3ft cable, RS-232 cable, USB adapter, software, AC adapter, and 3 AA batteries.
Typical Applications
- HVAC system monitoring and troubleshooting
- Cleanroom and laboratory environmental monitoring
- Industrial process control and quality assurance
- Museum, archive, and storage facility climate logging
- Pharmaceutical and food storage temperature/humidity tracking





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