Fluke Ti20 User Manual download pdf (Page 35)

Basic Operation

Environmental Conditions 2

2-11

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Figure 2-4. Correct Field of View

Environmental Conditions

Watch for environmental conditions in the working area. steam, dust, smoke, etc.,

can prevent accurate measurement by obstructing the path between the target and the

Imager optics. Noise, electromagnetic fields, or vibration are other conditions that can

interfere with temperature measurements, and should be considered before starting

temperature measurements.

Ambient Temperature Derating and Thermal Shock

The Imager’s operating temperature range is 0 °C to 50 °C (32 °F to 122 °F). As ambient

temperature slowly deviates from 25 °C (77 °F) there is a derating or the Imager’s

accuracy specification by ± 0.2 ° C/° C or ± 0.2% / ° C whichever is greater. For

example, if the Imager was operating in an ambient temperature of 35 ° C, the accuracy

specification would be ± [2 + (35 - 25) x 0.2] = ± 4 ° C for temperatures less than 100 ° C

or ± [0.02 + (35 - 25) x 0.002] x T (temperature being measured) for temperatures greater

than 100 ° C.

The Imager will work accurately even when subjected to sudden ambient temperature

change as large as ± 25 ° C (± 45 ° F) of more (going from a room at 25 ° C to a freezer

room at 0 ° C). For the most accurate readings, you should:

• Wait ~ 2 minutes after a large ambient shock (greater than 10 °C) before making

any readings.

• Turn the Imager on and then wait 3 seconds.

• For smaller ambient shocks (10 ° C change or less) no special precautions are

necessary.

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Fluke Ti20 User Manual Page 35