Product Overview
BluVac+ LTE User’s Guide
10
Calibration
If the Calibration Test indicates recalibration is required, the gauge may be recalibrated. Unlike any
other vacuum gauge, the BluVac+ LTE can be easily recalibrated to factory specifications without any
special equipment, with the following procedure:
1. For best results, clean the sensor with alcohol prior to calibration. Ensure the sensor is
completely dry before proceeding.
2. Turn the BluVac+ LTE power off. If necessary, install a fully charged battery into the gauge.
3. Place the dust cap over the vacuum fitting.
4. Hold while pressing . As soon as the power turns on, release and and
then press quickly at least three times. The CAL indicator should illuminate, and
should show on the Main Numeric Display. If not, turn the power off again and repeat.
5. Place the BluVac+ LTE in a clear Ziploc (resealable zipper storage) bag, press out any extra air,
and seal.
6. Place the bagged BluVac+ LTE into a freezer with a temperature of less than –5°C (23°F).
7. Allow the BluVac+ LTE to cool to below -2°C (28.4°F). At this point, the alarm will sound and the
display will change to .
8. Remove from freezer and press any key to silence the alarm.
9. Place the BluVac+ LTE undisturbed in an area with a room temperature of at least 23°C (73.4°F)
but no greater than 30°C (86°F).
10. Allow the BluVac+ LTE to warm to 20°C (68°F). At this point, the alarm will sound, and will
show on the display.
11. Press any key to silence the alarm. The BluVac+ LTE is now calibrated to factory specifications.
NOTE: For accurate calibration, it is necessary to allow the BluVac+ LTE to warm slowly. Attempting
to accelerate the warming by using a heat source will not provide satisfactory results. During the
cooling/warming process, the temperature will be indicated on the Alternate Numeric Display in
degrees Celsius. The calibration process may be canceled at any time by turning off the BluVac+
LTE. The previous calibration will be unchanged.
Low Temperature Operation
The BluVac+ LTE can operate accurately at temperatures as low as 10°F (-12°C). While operating
below freezing (32°F/0°C), the display update rate will slow from 3.5 readings every second to one
reading every two seconds.
A standard alkaline battey may not provide acceptable battery life at temperatures below 0°C (32°F).
For low temperature operation, a 9V Lithium battery is recommended.