61
7 Appendix
7.5.2.4 Ammonia NH
3
Type:
Electrochemical sensor
Measuring range:
0 – 100 ppm
Resolution:
1 ppm
Measuring error:
±3 % / ±3 ppm (±3 Digit)
Response time:
t
90
< 60 s
Drift:
< 5 % within 6 months
Temperature range:
-20 ºC – +40 ºC
Alarm thresholds (factory set-
tings):
AL1: 50 ppm
AL2: 75 ppm
AL3: 100 ppm
Interference at 20 ºC.
– 20 ppm H
2
approx. 1 ppm NH
3
Lifetime:
– Warranted
– Expected
1 year
> 2 years
Test gases:
– Zero point
– Sensitivity
Fresh air
50 ppm NH
3
in N
2
