MSA altair 4 Service Manual

Technical DataMSA
ALTAIR 4
GB
25
7.2 Factory-set Alarm thresholds
The ppm to mg/m³ conversion is calculated at 20° C and at atmospheric
pressure.
Sensor LOW alarm HIGH alarm STEL TWA
LEL 10 % LEL 20 % LEL -- --
O
2
19.5 % 23.0 % -- --
CO 25 ppm
[29 mg/m³]
100 ppm
[116 mg/m³]
100 ppm
[116 mg/m³]
25 ppm
[29 mg/m³]
H
2
S 10 ppm
[14.2 mg/m³]
15 ppm
[21.3 mg/m³]
15 ppm
[21.3 mg/m³]
10 ppm
[14.2 mg/m³]
Sensor Min. alarm set point Max. alarm set po Auto-cal values
LEL 5 60 58%
O
2
5.0 24 15.0%
CO 20 ppm
[23.2 mg/m³]
950 ppm
[999mg/m³]
60 ppm
[69.9 mg/m³]
H
2
S 5 ppm
[7.1 mg/m³]
175 ppm
[205.9 mg/m³]
20 ppm
[28.4mg/m³]
While the instrument can detect up to 25 % oxygen in ambient air, it is
approved for use only up to 21 % oxygen.

MSA altair 4 Specifications

General

Operating Temperature	-20°C to 50°C (-4°F to 122°F)
Ingress Protection	IP67
Type	Multi-gas Detector
Gases Detected	LEL, O2, CO, H2S
Display	LCD
Weight	Approx. 220g (with battery)
Sensor Type	Electrochemical (for H2S, CO, and O2); Catalytic Bead (for LEL)
Alarm Type	Audible, Visual, Vibrating
Detection Range	O2: 0-30% vol, LEL: 0-100% LEL, CO: 0-999 ppm, H2S: 0-500 ppm
Humidity Range	15% to 90% RH non-condensing
Certifications	UL, CSA, ATEX, IECEx