MSA altair 4 - Performance Specification

MSA TECHNICAL SPECIFICATIONS/CERTIFICATIONS
ALTAIR 4 - Operating Manual 47
5.4 Performance Specification
5.4.1 Combustible Gas
Range
0 to 100 % LEL or 0 to 5 % CH
4
Resolution
1 % LEL or 0.05 % vol CH
4
Reproducibility
3 % LEL, 0 % to 50 % LEL reading
or 0.15 % CH
4
, 0.00 % to 2.50 % CH
4
(normal temperature range)
5 % LEL, 50 % to 100 % LEL reading
or 0.25 % CH
4
, 2.50 % to 5.00 % CH
4
(normal temperature range)
5 % LEL, 0 % to 50 % LEL reading
or 0.25 % CH
4
, 0.00 % to 2.50 % CH
4
(extended temperature range)
8 % LEL, 50 % to 100 % LEL reading
or 0.40 % CH
4
, 2.50 % to 5.00 % CH
4
(extended temperature range)
Response time 90 % of final reading in less than or equal to
30 sec (normal temperature range)
5.4.2 Oxygen
The oxygen sensor has built-in temperature compensation. However, if
temperature shifts dramatically, the oxygen sensor reading may shift. Zero
the instrument at a temperature within 86°F (30 °C) of the work place
temperature for the least effect.
Range
0 to 25 vol.% O
2
Resolution
0.1 vol.% O
2
Reproducibility
0.7 vol.% O
2
for 0 to 25 vol.% O
2
Response time
30 second (normal temperature range)
3 minutes (extended temperature range)