Extech Instruments IRT600 User Manual page 2

Introduction
Congratulations on your purchase of the Model IRT600 Dew Point Temperature Detector! The
IRT600 is capable of displaying Air Temperature (AT), Surface Temperature (ST), Relative
Humidity (RH), and Dew Point Temperature (DP) and can analyze the potential for mildew. The
LED lamp above the LCD display changes color to indicate the potential for mildew: green (no
mildew), yellow or amber (low to moderate probability of mildew), and red (high probability of
mildew).
The IRT600 measures Surface Temperature using an infrared (IR) sensor and includes dual red
laser pointers for improved targeting. The IR sensor has a 12:1 Distance to Spot ratio. This means
that a target 30cm away from the meter has a spot diameter of 1.25cm, a target 45cm away has
a spot diameter of 3.75cm, and so on. The closer to the target, the smaller the spot size and the
further away, the larger the spot size (very much like a flashlight beam behaves with regard to
distance‐to‐spot ratio).
The Air Temperature and Relative Humidity are measured by the internal sensors at the top of
the meter. Dew Point Temperature is calculated using Air Temperature and Relative Humidity
measurements. Mildew analysis is based on calculations made from Air Temperature, Surface
Temperature, Dew Point Temperature, and Relative Humidity values.
This meter is shipped fully tested and calibrated and, with proper use, will provide years of
reliable service. Please visit the website www.extech.com for the latest version of this User
Guide, Customer Support, and information on other products offered by Extech Instruments and
FLIR Systems.
Safety

Use extreme caution when the laser pointer beam is on

Do not point the beam toward anyone's eye or allow the
beam to strike the eye from a reflective surface.

Do not use the laser near explosive gases or in either
potentially explosive areas.

Do not clean the laser with any corrosive acids or liquids.

Use an appropriate (9V) battery to power the meter.
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