Sensor Performance Specifications - MSA ALTAIR 5 Manuel D'utilisation

NOTE: No alarm thresholds are possible for the 0-100% Volume
Methane, Propane and Butane IR sensors. In environments with
>100% LEL combustible gas present, units with a combustible
LEL sensor will be in a latching over-range alarm, and the
100% volume IR sensors will display the % volume gas reading.

5.3 Sensor Performance Specifications

PRIMARY SENSORS
Sensor Display Range
Com- 0-100% LEL
bustible or 0-5% CH 4
(LEL)
Oxygen 0-25% O 2
Carbon 0-1000
Mon- ppm CO
oxide
Hydro- 0-200
gen ppm H 2 S
Sulfide
Resolution Reproducibility
1% LEL or Normal temp. range:
0.05% vol <50% LEL:
CH 4 50-100% LEL:
<2.5% CH 4 :
2.5-5.00% CH 4 : 0.25% CH 4
Extended temp. range:
<50% LEL:
50-100% LEL:
<2.5% CH 4 :
2.5-5.00% CH 4 : 0.40% CH 4
0.1% O 2 0.7% O 2 for 2 - 25% O 2
1 ppm CO, Normal temp. range:
0-300 ppm CO:
±5 ppm or 10% of reading,
whichever is greater;
>300 ppm CO: ±15ppm
Extended temp. range:
±10 ppm or 20% of reading,
whichever is greater
1 ppm H 2 S, Normal temp. range:
3-200 0-100 ppm H 2 S
ppm H 2 S ±2 ppm H 2 S
or 10 % of reading,
whichever is greater;
>100 ppm H 2 S:
±15 ppm H 2 S
Extended temp. range:
±10 ppm or 20% of reading,
whichever is greater
Response Time
t(90) ≤30 sec
3% LEL (normal temp.)
5% LEL
0.15% CH 4
5% LEL
8% LEL
0.25% CH 4
t(90) ≤ 30 sec
(normal temp.)
t(90) ≤ 3 min
(extended temp.)
t(90) ≤60 sec
(normal temp.)
t(90) ≤60 sec
(normal temp.)
5-3