Cole-Parmer Infrared Thermometers Distance to Target Diagrams

Document 32003, p. 1 of 2

Copyright © 2002 all rights reserved

800-323-4340
www.coleparmer.com

International fax: [phone]
In Canada, call Labcor at 800-363-5900

In the UK, call Cole Parmer Instrument Co. Ltd.
at 0500 345 300

Fax: [phone]
E-mail: [e-mail]

Distance to Target Diagrams
for Cole-Parmer

®

Infrared Thermometers

Distance-to-spot ratio.

The optical system of an infrared thermometer collects
the infrared energy from a circular measurement spot
and focuses it on the detector. Optical resolution is
defined by the ratio of the distance from instrument to
the object compared to the size of the spot being
measured (D:S ratio). The larger the ratio number the
better the instrument’s resolution, and the smaller the
spot size that can be measured. The laser sighting
included in some instruments only helps to aim at the
measured spot. A recent innovation in infrared optics
is the addition of a Close Focus feature, which pro­vides accurate measurement of small target areas
without including unwanted background temperatures.

Field-of-view.

Make sure that the target is larger than
the spot size the unit is measuring. The
smaller the target, the closer you should
be to it. When accuracy is critical make
sure that the target is at least twice as
large as the spot size.

Copyright © 2002 all rights reserved

800-323-4340
www.coleparmer.com

International fax: [phone]
In Canada, call Labcor at 800-363-5900

In the UK, call Cole Parmer Instrument Co. Ltd.
at 0500 345 300

Fax: [phone]
E-mail: [e-mail]

Document 32003, p. 2 of 2

Model 39800-40

Models 39800-42 and -43

Models 39800-46, -47, and -48

Models 39800-22 and -23

Models 39800-30, -32, -33, -35

Models 39800-02, and -03

Model 39800-00