General Tools and Instruments HT50 v.1 - Manual (Page 17)

• To print the .txt file of any data log, click the Print virtual
button.
• To open a previously saved data log, click the Open
button. This function is also available as the “View
previously saved data” option shown in Fig. 2.
• To export a file to Excel for advanced trending and
analysis, click the Export to Excel button.
USING THE IR THERMOMETER
The HT50 has an integral IR thermometer that can be used to
spot-check the temperature of any surface from a distance.
This function would, for example, enable an HVAC/R system
installer to quickly check the temperature of air exiting a duct
without having to use an anemometer-thermometer.
To activate the IRT, press and hold the Meas button (Fig. 1a,
Callout H) while aiming the laser pointer at the surface of
interest. The measured temperature will instantly appear on
the LCD in the currently selected unit, along with the
indication IRT in the upper right corner.
When you release the Meas button, the “Hold” icon (a lock;
see Fig. 1b) will also appear on the display to indicate that the
displayed value is being held. The reading will be held for
10 seconds. At that time, the HT50 will exit IRT mode and
resume displaying temperature, humidity or working status
on its LCD.
The HT50’s IRT has a distance-to-spot (D:S) ratio of 2:1 and
assumes that its target has an emissivity of 0.95 (a valid
assumption for most materials). Include these specifications
when considering how close you must be to a target to
measure its temperature accurately, without including the
temperature of its surroundings.
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