50
MANUAL CALIBRATION
COMBUSTIBLE GAS CALIBRATION
(50% (2.5%) LEL METHANE)
From the working display press & hold the TICK/MENU BUTTON (B)
until the top line reads USER MENU. Press & release the SAVE/ZERO
BUTTON (C) until the bottom line reads CAL.
Press & release the TICK/MENU BUTTON (B) once, the bottom line
will read AUTO CAL. Press & release the SAVE/ZERO BUTTON (C)
once. The bottom line will read 2.5%V/V. Apply 50%LEL methane/air
calibration gas and press & release the TICK/MENU BUTTON (B) to
start 50% LEL calibration.
When readings stabilize, the display will read DATA SAVED indicating
calibration is complete for that sensor. Do not remove the gas until
the second DATA SAVED flashes. Two calibrations take place during
the 50%LEL Methane calibration. The date for CAL PAST DUE is
automatically reset for that sensor as well.
Scroll with the SAVE/ZERO BUTTON (C) if you need to calibrate another
sensor. When finished, remove and shut off the gas supply. Press &
release the POWER/MUTE BUTTON (A) to return to the working display.