Setup Instructions; Install Batteries; Operating Instructions; Basic Operation In Scan Mode - General IRT850K Manuel De L'utilisateur

SETUP INSTRUCTIONS

INSTALL BATTERIES

The IRT850K is ready for use after you install two "AAA" batteries (not included) in the
instrument's grip. To open the battery compartment (Fig. 1, Callout 7), pull the top of its hinged
cover away from the grip. Then install the two batteries in the compartment, using the + and –
marks inside it as a guide. Close the compartment by swinging the cover back to its original
position and snapping it shut.

OPERATING INSTRUCTIONS

BASIC OPERATION IN SCAN MODE

The IRT850K's default operating mode is to scan a target object's surface and display its
temperature.
To make a quick measurement, point the infrared lens on the front of the instrument (Fig. 1,
Callout 8) at a target and squeeze and hold the measurement trigger (Callout 6). The temperature
of the target will instantly appear on the main (upper) readout in the thermometer's default unit
of degrees Fahrenheit (°F). Before releasing the trigger, note the SCAN icon on the top line of
the display.
Now release the trigger and note that: 1) the main readout will hold the reading for 1 minute (as
indicated by the HOLD indication at the upper left of the LCD); and 2) the IRT will briefly display
the term oFF and then power off. This Auto Power Off (APO) function conserves battery life.
To make an accurate measurement, use the IRT850K's dual laser beams to define the
diameter of the target. Unlike convergent lasers used to identify the spot distance, the IR850K's
dual lasers are designed to highlight the spot diameter beyond the focal point (see figure
below)—and therefore the target area—at any distance beyond the spot. This capability is not
just convenient, but also critical in making accurate temperature measurements.
1.5 ft. 2 ft.
1 ft.
75 ft. 100 ft.
50 ft.
Fig. 3. The IRT850K's field of view, created by dual diverging laser beams
All IR thermometers, including the IRT850K, take the average temperature of all objects within a
circular target area. Depending on the distance to the target, the target area may include both the
target and background objects in the thermometer's field of view. If background objects in the
field of view are cooler than the target, the measured temperature will be lower than the target's
5