Turning Off The Altair Pro Detector - MSA ALTAIR Pro H2S Manual De Operación

• STEL is automatically reset to zero when the instrument is
turned ON.
• STEL value is calculated over a 15-minute exposure.
• The following formula is used to calculate the STEL value:
• If the instrument is ON for less than 15 minutes:
• the balance of the minute PPM values is set to zero and
• the total is divided by 15 minutes.
11) Time Weighted Average, TWA
• The TWA reading displays what the instrument has calculated
since power-ON.
• When this page displays, press the TEST button to clear.
• "CLR" displays
• TWA value is automatically reset to zero when the instrument
is turned ON.
• TWA value is calculated over an eight-hour exposure
• The following formula is used to calculate the TWA value:
• If the instrument is ON for less than 8 hours (480 minutes), the
balance of the minute ppm values is set to zero,
12) IR mode.
• When instrument displays "IR?", press button to enter IR mode.
• If IR communications are not detected for three minutes or the
TEST button is pressed, the instrument will exit this mode.
• See FIGURE 2-5 for additional details.

Turning OFF the ALTAIR Pro Detector

1. Press and hold the TEST button for three seconds.
• "OFF" and the hourglass display.
2. Continue to press the TEST button for two more seconds.
• The instrument turns OFF.
NOTE: The Steel Mill version can't be turned OFF without
removing the battery.
(Minute #1 PPM value) + (Minute #2 PPM value) +....
(minute #15 PPM value) / (15 minutes) = PPM STEL value
Sum of 1-minute gas readings/ 480 minutes (8 hours) = TWA value
2-15