OPERATING MANUAL OXYGEN MONITORING SYSTEM
OMS 420
41
11
Technical specifications
Measurements
Oxygen and combustibles (equivalent CO
e
) contained in flue gas
Measurement principle
Heated zirconium oxide cell for O
2
,
Heated solid electrolyte cell for CO
e
Lifetime of cells
more than 5 years under normal conditions (*)
Warm-up time
minimum 30 minutes
Measurement range
0 – 25.0 % for O
2
0 – 1,000 ppm for CO
e
Resolution
0.01 % for O
2
and 1 ppm for CO
e
.
Repeatability
within ± 1 % of full scale for O
2
Linearity
better than ± 1 % of full scale for O
2
Accuracy
O
2
:
± 0.2 % O
2
or ± 5 % of reading (whichever is larger)
COe:
not selective measurement, accuracy is not an issue
Response time
< 10 seconds
Electronics
micro-controlled based, on board graphic backlit LCD
Output signals
2 x 4 – 20 mA, galvanic isolated, max. 500 R (for direct transfer to process PLC)
RS 485, galvanic isolated digital data transfer (Modbus protocol RTU)
Power supply
18 Vdc to max. 24 Vdc, 100 W for compact probe model OMS420
100…240Vac / 50-60Hz, 100W for all other models
Ambient temperature
- 4
o
F … 140
o
F ( -20°C …+ 65°C)
Ambient humidity
5 – 95 %, non condensing
Protection
IP 65 (NEMA 4)
(*) in the absence of heavy metals, silicones, silicates, aggressive and/or corrosive gases
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