Honeywell Impact Series Operating Instructions And Maintenance Manual page 58

9. The sensors fitted to Impact Pro may give responses to gases other then
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.
10. Your attention is drawn to the cross-sensitivity of the NH
presence of H
the NH
3
Applied
Gas Sensor
CO
100 ppm
(100 ppm)
H S
2
(40 ppm)
CO
2
(0.5% v/v)
Cl (5 ppm)
2
NH
3
(50 ppm)
Hydrogen
200 ppm
(1000 ppm)
SO
2
(10 ppm)
1
Reading displayed as -0ppm.
** Electrochemical CO
58
S. This is normal operation and is due to the chemistry of
2
sensor.
Effect Effect
on CO on H S
2
Sensor
0 ppm
0 ppm 40 ppm
0 ppm 0 ppm
0 ppm 0 ppm
0 ppm 0 ppm
0 ppm
0 ppm 0 ppm
cell only
2
Impact / Impact Pro / Impact Pro IR Operating Instructions
Effect Effect
on CO on Cl
2 2
Sensor** Sensor
0% v/v 0 ppm
0% v/v -25 ppm
0.5% v/v 0 ppm
0% v/v 5 ppm
0% v/v -2 ppm
0% v/v TBA
0% v/v 2 ppm
sensor in the
3
Effect Effect
on NH on SO
3
Sensor Sensor
35 ppm 1 ppm
50 ppm 1 ppm
1
0 ppm
0 ppm -2 ppm
50 ppm
1
35 ppm
0 ppm 10 ppm
2
TBA
1
TBA
TBA