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a. A single press of
incremental changes to increase display reading, or
a single press of
decremental changes to decrease display reading,
until the displayed gas value corresponds to the
concentration of the calibration gas.
b. When required reading has been reached, press
and hold
calibration. The display may jump above and below
required reading momentarily as the instrument
performs the calibration.
Note: If for any reason you require to exit SPAN mode
without calibration of the instrument, press and hold
(Button 3).
9. The instrument display will now return to CAL mode
display as shown in Figure B-7.
10. Make sure that correct reading is displayed before
disconnecting the calibration gas then disconnect
tubing from instrument inlet and turn regulator valve
on calibration gas cylinder in a clockwise direction
to turn off gas flow.
(Button 3) will produce small
(Button 4) will produce small
(Button 4) to exit SPAN mode with
Fig. B-7 50% LEL Display
FIELD CALIBRATION
B-7
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