23
4. Referring to the spot size figure, aim the laser
beam at the object whose temperature is to be
measured.
5. Pull the cap on to extend life of the sensor and to
avoid danger caused by wrong way to use laser.
REMARK: Although the field of measurement (or
field of view) and the spot almost coincide, actu-
ally the field of measurement corresponds to the
diameter for 90% optical response. The object
whose temperature is to be measured needs to
be larger than the measurement diameter (spot of
size) by an adequate margin at least 1.5 to 2 times
larger.
5.2 Highest Temperature Location
Aim the thermometer to the object, then start a scan
movement across the measured area, in up and down
motion until locate the hottest point.
Diameter of Spot (mm)
Distance to Object (mm)
Laser
Marker
250
500
1000
16
25
Ø
50
Ø
100
Ø
Spot size increases with distance from the probe tip as shown
( Spot Diameter measured at 90% Energy )
