Specifications

GB
OPERATION MSA
26 ALTAIR PRO - Operating Manual
11) Time Weighted Average ("TWA")
The TWA reading displays what the instrument has calculated since power-
ON. When this page is displayed, press the button to clear.
 "
CLR" is displayed
 Value is deleted
TWA value is automatically reset to zero when the instrument is turned ON.
TWA value is calculated over an eight-our exposure.
The following formula is used to calculate the TWA value:
Sum of 1-minute gas readings/480 minutes = PPM TWA value
If the instrument is ON for less than 8 ours (480 minutes), the balance of the
minute ppm values is set to zero.
12) IR mode
When instrument displays "IR?", press the button to enter IR mode.
If IR communications are not detected for three minutes or the button is
pressed, the instrument will exit this mode ( Fig. 5 for additional details).
3.7. Turning OFF the Instrument
(1) Press and hold the button for three seconds.
 "OFF" and the hourglass display.
(2) Continue to press the button for two more seconds.
 The instrument turns OFF.
The Steel Mill version can not be turned OFF without either removing
the battery or using MSA FiveStar
®
Link
™
Software.