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6
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4.0
Calibration
4.1 On initial start up with a new sensor, allow the unit to stabilize for
about 10 minutes before proceeding to the next step.
4.2 With the chuck exposed to air, press and hold ( ) key down until
the LCD starts to count down from 3 to 0. Release the ( ) key and
wait for the LCD to read 79.1 (calibration point) plus or minus 0.1.
Excluding factors such as temperature,humidity and traces of other
gases, the air we breathe contains 78.084% Nitrogen, 20.946%
Oxygen, 0.934% Argon and 0.033% Carbon Dioxide.
Note : Excess Nitrogen in the sensing head during calibration will lead to
low readings during sampling. For best results, calibrate the
instrument each day before sampling begins. This will ensure the
sensing head is exposed to air for accurate calibration. If calibration
is needed during normal use, leave the sensing head exposed to
air for about 10 minutes or until the readings stabilize before
commencing with the calibration.
5.0
Gas Sampling
Press and hold chuck onto the valve stem and allow the gas to flow until a
stable reading is achieved. Depending on the tire pressure, sample time is
about 10 seconds. Repeat the sampling process as needed.
Note : It is not necessary for the reading to return to the calibration point
(79.1) between samples.
6.0
Turning the unit OFF
To switch off immediately, press and hold the ( ) key for 1 second, then
release the ( ) key. To extend battery life, the unit has an auto-off
function after 5 minutes.
7.0 Freezing of Gas Sampling Reading
To freeze the gas sampling reading, make a quick press and release the ( )
key. When the reading is put on freeze, the display will flash. To resume the gas
sampling, make another quick press and release the ( ) key. The display will
stop flashing, showing the corresponding gas reading.
