29
CALIBRATION
COMBUSTIBLE GAS CALIBRATION PROCEDURE
(50%LEL METHANE OR 50%LEL PENTANE)
The calibration gas used for this procedure should match the Gas Type
selected for your instrument. Refer to Gas Type in the Menu section of
this manual. Instruments set to methane will calibrate with 50% LEL
methane/air while those set to pentane will calibrate with 50% LEL
pentane/air.
STEP 1 -
Prior to calibration allow the instrument to operate for 5
minutes in a gas free environment. Manually zero the instrument by
press and holding the (C) button until the display shows AUTOZERO.
STEP 2 -
Prepare the corresponding calibration gas (methane or
pentane), regulator and adapter. Turn off the tick rate before calibrating.
STEP 3 -
From the working display access the USER MENU by pressing
and holding the (B) button until the top line of the display reads USER
MENU. Press and release the (C) button and the bottom line should
read CALIBRATION. Press and release the (B) button, the top line will
read CALIBRATION and the bottom line will read LEL 50%.
STEP 4 -
Apply the appropriate calibration gas for your instruments set-
up and press the (B) button to start the automated calibration process.
If calibration is successful, the display will flash DATA SAVED before
automatically returning to the calibration menu. Pressing the (A) button
repeatedly will return the instrument to the working display. Remember
to disconnect and shut off the gas supply.
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