Accessing The Instrument Pages; For All Versions (Excluding The Steel Mill Version) - MSA ALTAIR Pro H2S Manual De Operación

Accessing the Instrument Pages

A single, quick button press turns ON the backlight for 10 seconds.
The Information page can be accessed by pushing the TEST button for
about one second.
• The instrument beeps twice.

For All Versions (Excluding the Steel Mill Version):

1) Test gas mode
2) Minimum Oxygen concentration ("LO") - for oxygen only
3) Peak Reading
• Toxic ("HI")
• Oxygen ("HI")
• The Peak/Hi and Min/Low values can be cleared.
• When this page is displayed, press the TEST button to clear.
• "CLR" displays.
4) Short Term Exposure Limit, STL.
• The STL reading displays that the instrument calculated since
power-ON.
• When this page displays, press the TEST button to clear.
• "CLR" displays.
• 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.
• Quick changes in barometric pressure result in an
offset in the sensor reading for a few minutes. If this
occurs, do not use the instrument for a period of five
minutes; then, perform a Fresh Air Set-up (FAS) to
re-zero the sensor. Perform the FAS in fresh air only.
(Minute #1 PPM value) + (Minute #2 PPM value) +....
(minute #15 PPM value) / (15 minutes) = PPM STEL value
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