12
Operating the MultiRAE Plus
Preset Alarm Limits and Calibration
The monitor is factory calibrated with standard calibration gas and is
programmed with default alarm limits as listed:
Gas
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
%Vol
-
-
19.5
23.5
CH
4
50/Air
%LEL
-
-
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
VOC*
100/Air
ppm
10.0
25.0
50.0
100
*Note: 100 ppm isobutylene gas is used for VOC gas calibration
Back Light
The backlight assists reading the LCD in poor lighting conditions and
automatically turns on anytime the MultiRAE Plus is in alarm.
To manually turn on, press [N/-] , and it will automatically turn off after
60 seconds. The backlight can also be set to automatically turn on in low
lighting conditions, and likewise turn off in adequate lighting conditions.
NOTE:
The backlight can shorten the operating time by 20-30%.
Sampling Pump
The integrated sampling pump automatically turns on when the monitor
is turned on and remains on during normal operation. The pump speed
is adjustable between the default low setting (~200 cc/min) and the
high setting (~300 cc/min). Use the low setting to save battery and filter
life. Use the high setting for reactive gases and remote sampling in
applications like Wingtank entry and HazMat.
N/-
