MSA altair 4 - Page 18

DESCRIPTION MSA
18
ALTAIR 4 - Operating Manual
TWA calculation examples:
1-hour exposure of 50 ppm:
(1 hour x 50 ppm) + (7 hours x 0 ppm)
8 hours
= 6.25 ppm
4-hour exposure of 50 ppm and 4-hour exposure of 100 ppm:
(4 hours x 50 ppm) + (4 hours x 100 ppm)
8 hours
= 75 ppm
12-hour exposure of 100 ppm:
(12 hours x 100 ppm)
8 hours
= 150 ppm
2.3.6 Time Display
Current time appears on the display in a 12-hour format by default.
A 24-hour format can be selected using MSA Link.
2.3.7 Date Display
Current date appears on the display in the format: MMM-DD-YYYY.
2.3.8 Last cal page
Displays the instrument's last successful calibration date in the format:
MMM-DD-YYYY
2.3.9 Cal due page
Displays the days until the instrument's next calibration is due (user
selectable).
2.3.10 Motion Alert Activation (optional)
To activate or deactivate the Motion Alert feature, press the
[
]
button
while the Motion Alert Activation page is displayed. When the Motion Alert
feature is active, the
symbol will flash every 3 seconds. The instrument
will enter pre-alarm when no motion is detected for 20 seconds. This
condition can be cleared by moving the instrument.
After 30 seconds of inactivity, the full Motion Alert alarm is triggered. This
alarm can only be cleared by pressing the
[
]
button.