User Manual

ALTAIR
®
4XR
35
Operation
US
The  symbol will be displayed in the Normal Operation mode and the Bump LED will flash green for
24 hours after a successful Bump Test.
3.9 Bump LED
The device is equipped with a green Bump LED. The green LED flashes every 15 seconds under the
following conditions:
• the Bump LED feature is enabled
• after a successful Bump Test (for 24 hours)
• device is in Normal Operation mode
• device is not in Low Battery warning or alarm
3.10 Calibration
The device can be calibrated either manually using this procedure or automatically using the GALAXY
GX2 Test Stand. Refer to 7.7 "Calibrations".
Calibration must be performed using a flow regulator with a flow rate set to 0.25 liters per minute.
If a battery charging cycle is interrupted before it is completed (4 hours for a fully discharged battery),
allow the device’s internal temperature to stabilize for 30 minutes before performing a Calibration.
NOTE: The GALAXY GX2 Test Stand is not a CSA certified calibration method.
Fresh Air Setup and Zero Calibration
(1) Press and hold the  button in Normal Operation mode for three seconds.
(2) If calibration lockout option is selected, enter password.
ZERO CAL? screen is then displayed.
Under normal circumstances MSA recommends calibration at least every six months,
however, many European countries have their own guidelines. Please check your
national legislation.
To skip the Zero procedure and move directly to the Calibration Span procedure, push
the  button. If no button is pushed for 30 seconds, the device prompts user to perform
a Span calibration before returning to the Normal Operation mode.