Extech Instruments RH520A User Manual page 2

Introduction
Congratulations on your purchase of the Extech RH520A Temperature + Humidity Chart
Recorder. The RH520A measures and displays Temperature, Humidity, and Dew Point.
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.
CAUTIONS

This device is not a toy and must not reach children's hands. It contains hazardous objects
as well as small parts that the children could swallow. In case a child swallows any of them,
please contact a physician immediately

Do not leave batteries and packing material lying around unattended; they can be
dangerous for children if they use them as toys

In case the device is going to be unused for an extended period of time, remove the
batteries to prevent them from training

Expired or damaged batteries can cause cauterization on contact with the skin. Use
protective hand gloves in such cases

See that the batteries are not short‐circuited. Do not throw batteries into the fire.
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RH520A-EU-EN v4.4 8/13