OPERATING MANUAL OXYGEN MONITORING SYSTEM
OMS 420
12
It is important to monitor the rising level of combustibles, labeled
opt
in the above diagram, and to trim the air/fuel ratio of the
burner to compensate for changing ambient conditions (pressure and humidity) and maintain the point of maximum heat effi-
ciency.
The diagram below illustrates the burner operating under two conditions:
Conventional operation with increased safety margin (higher O
2
concentration in the stack
gas).
Improved operation with optimized combustion (lowest O
2
concentration in the stack gas
without a corresponding increase in combustibles).
The difference between the yellow area and the brown area represents the degree of combustion optimization, which in turn
represents savings in fuel.
7.2
OMS420 features
The main features of OMS420 system are:
•
Compact, reliable and rugged industrial design.
•
Special reference air not required (uses ambient by natural diffusion).
•
True wet gas analysis and calculation of dry oxygen level if humidity of gas is known.
•
Fast response time.
•
Low energy consumption for both O
2
and COe sensors.
•
Micro-controller based electronics with backlit, graphic LCD display.
•
Linearized, galvanic isolated 4 - 20 mA signal outputs for both O
2
and COe.
•
RS485 galvanic isolated digital data transfer (Modbus protocol RTU).
•
Field replaceable transmitter
•
Fast, safe and easy servicing by a single technician without removing the probe from the stack
•
Dust tight and water proof enclosure IP65 (NEMA 4)
•
Easy operation and maintenance
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