Monitoring Voc Gases - MSA ALTAIR 5X PID Operating Manual

Gas Exposure of 100 % LEL
When gas reading exceeds 100 % of the lower explosive limit (LEL), the device enters a Lock Alarm
state and displays "XXX" in place of the actual reading.
A catalytic combustible gas reading of "XXX" indicates the atmosphere could be above 100 % LEL
and an explosion hazard exists. Move away from contaminated area immediately.
The user can clear the LockAlarm state only by turning the device OFF, and then ON again in a fresh
air environment. When catalytic combustible gas reading digits appear, the device is available for
measuring gases once again.
Check your national standard values for 100 % LEL.
3.10

Monitoring VOC Gases

The device is equipped with a PID sensor that detects a variety of VOC gases. The device displays
the gas concentration in parts per million (ppm), µmol/mol or mg/m3 on the Measuring page.
If an alarm is triggered while using the device, leave the area immediately.
Remaining in the area under such circumstances can cause serious personal injury or death.
The device has four gas alarms:
-
HIGH Alarm
-
LOW Alarm
-
STEL Alarm
-
TWA Alarm
If the gas concentration reaches or exceeds the alarm set point or the STEL or TWA limits, the:
-
alarm message displays and flashes in combination with the corresponding gas concentration
-
backlight turns on
-
alarm sounds (if active)
-
alarm LEDs flash (if active)
-
vibrating alarm triggers (if active)
To reset the alarm press the
False VOC alarms can occur due to changes in barometric pressure (altitude), humidity or extreme
changes in ambient temperature.
It is recommended that a VOC calibration be performed at the temperature, humidity and pressure of
use.
Be sure that the device is in known fresh air before performing a calibration. For optimal lamp strike,
the PID lamp should be started within the normal temperature range.
When the device is calibrated in an dry, air conditioned environment and taken to a high
temperature and high humidity outdoor environment, a VOC Low or High alarm may be
triggered by this sudden change. It is recommended that the PID sensors be cleaned
prior to this transition to avoid this situation, or to acclimate the sensor to the outdoor
conditions in a known safe area.
WARNING
WARNING
button.
ALTAIR 5X PID
Description
US
26