Impact / Impact Pro / Impact Pro IR Operating Instructions
65
for a period of 15 minutes between NH
3
, H
2
S or Cl
2
and NO
2
calibrations
to avoid interaction between these gases.
The sensors fitted to Impact Pro may give responses to gases other then 9.
the target gas. The table below gives typical sensor responses to various
gases and should be used as a guide only. Note: Always use the target
gas to perform sensor calibrations.
Applied
Gas
Effect
on CO
Sensor
Effect
on H
2
S
Sensor
Effect
on CO
2
Sensor**
Effect
on Cl
2
Sensor
Effect
on NH
3
Sensor
Effect
on SO
2
Sensor
Effect
on NO
2
Sensor
CO
(100 ppm)
100 ppm 0 ppm 0% v/v 0 ppm 35 ppm 1 ppm 0 ppm
H
2
S
(40 ppm)
0 ppm 40 ppm 0% v/v -25 ppm
1
50 ppm 1 ppm -3.2 ppm
1
CO
2
(0.5% v/v)
0 ppm 0 ppm 0.5% v/v 0 ppm 0 ppm TBA TBA
Cl
2
(5 ppm)
0 ppm 0 ppm 0% v/v 5 ppm 0 ppm -2 ppm
1
5 ppm
NH
3
(50 ppm)
0 ppm 0 ppm 0% v/v -2 ppm
1
50 ppm TBA TBA
Hydrogen
(1000 ppm)
200 ppm 0 ppm 0% v/v TBA 35 ppm TBA TBA
SO
2
(10 ppm)
0 ppm 0 ppm 0% v/v 2 ppm 0 ppm 10 ppm 0 ppm
NO
2
(10 ppm)
0 ppm 0 ppm 0% v/v 0 ppm -5 ppm
1
-10 ppm
1
10 ppm
1
Reading displayed as -0ppm.
** Electrochemical CO
2
cell only