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Extech RH520A Humidity & Temperature Chart Recorder


The Extech RH520A IS A Graphical datalogger for Humidity/Temperature measurements and Dew Point calculation.

Desk mount configuration with easy to program swivel arm control panel plus probe with remote cable for reaching into ducts and humidty chambers
Wall mounted for storage and easy viewing of Temperature and Humidity trends with date/time stamp
New LabView based PC software and cable for download control and to graph Relative Humidity, ambient temperature, dew point, wet bulb, and GPP or g/kg)

Authorised Australian Distributor

CE   1 Year

videoreel 2 RH520A Intro Video

videoreel 2RH520A Video

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Extech RH520A Features

  • Basic accuracy 3%RH, 1.8°F/1°C
  • Simultaneous numerical and graphical display of Humidity and Temperature readings, plus Time and Date
  • Measures Humidity (10 to 95%RH) and Temperature (-20.0°F to 140.0°F) plus calculates Dew Point
  • LCD indicates percentage of memory remaining
  • Large dual graphical LCD displays with adjustable vertical and horizontal TAC resolution
  • Internal memory records up to 49,000 data points and can be transferred to a PC via RS-232 serial port for further data analysis

Extech RH520A Applications:

  • Store humidity and temperature historical data for report generation
  • Record process conditions
  • Monitor and record Laboratory or clean Room temperature and humidity history
  • Generate warning when conditions are outside required limits
  • Monitor controlled environment areas such as freezers, storage areas and other critical areas


  • Built-in stand
  • detachable probe with 3ft (1m) cable
  • RS232 cable
  • RS-232 To USB Adaptor
  • LabView-based PC software
  • 100-240VAC 50/60Hz adaptor
  • 3 AA batteries

Extech RH520A Remote Probe

The remote (detachable) probe senses the ambient conditions while the LCD display graphs and provides numerical representation of the readings. Programmable audio‐visual alarms alert the user when ambient conditions reach alarm presets. The optional alarm module permits automatic relay switching when alarm presets are reached. The RH520A Internal Memory can store up to 49,152 measurements for later transfer to a PC. Careful use of this instrument will provide years of reliable service.


Relative Humidity Range 10.0 to 95.0%
Temperature Range -28.0 to 60.0°C
Accuracy ±3% Relative Humidity; ±1°CTemperature
Dimensions 129 x 195 x 22mm
Weight 357g


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