OPERATION OF VRAE
2 - 22
2.7 Preset Alarm Limits and Calibration
The VRAE Multi gas monitor is factory calibrated with
standard calibration gas, and is programmed with default
alarm limits as listed below. Refer to Section 4 for
programming procedures if new calibrations or alarm limits
are required.
Table 2.2
Factory Calibration and Preset Alarm Limits
Gas
ppm
Cal Gas /
Balance
Unit
TWA
STEL Low High
CO
50 / Air
ppm
35
100
35
200
H
2
S
25 / N
2
ppm
10
15
10
20
SO
2
5 / N
2
ppm
2
5
2
10
NO
25 / N
2
ppm
25
25
25
50
NO
2
5 / Air
ppm
1
1
1
10
Cl
2
10 / N
2
ppm
0.5
1
0.5
5
O
2
20.9 / N
2
%
-
-
19.5 23.5
CH
4
50 / Air
%LEL
-
-
10
20
CH
4
20 / N
2
%Vol
-
-
10
20
HCN
10 / N
2
ppm
5
5
5
50
NH
3
50 / N
2
ppm
25
35
25
50
PH
3
5 / N
2
ppm
0.3
1
1
2
ClO
2
0.5/Air
ppm
0.1
0.3
0.2
0.5
