OPERATING MANUAL OXYGEN MONITORING SYSTEM
OMS 420
13
7.3
Probe models
There are three distinctive models of the OMS420 probe available:
- The
compact
model
OMS420
, which uses the flow guidance tube principle. The probe tube can be made of stainless
steel for stack gas temperatures up to 1.200
o
F (650 °C) or made of AISI300 steel for stack gas temperatures up to
1.800
o
F (1.000 °C)
- The
remote transmitter
model
OMS420RT
, which is similar to above model but has the transmitter electronics
separated from the probe by means of a 10 m (30 ft) special cable
- The
high temperature
model
OMS420HT
has no flow guidance tube but uses a ceramic tube and an air jet pump
(ejector) to extract the sample from the tip of ceramic tube. It can be used for clean flue gas temperatures up to
3.100 °F (1.700 °C).
7.3.1
Compact model OMS420 (# 61417)
This model shall be used at site with low heat radiated from the process (ambient temperature to transmitter electron-
ics is less then 140 °F / 60 °C).
Compact model components are:
•
probe with flow guidance tube and flange (ANSI150 or DN80 or DN65)
•
mounting flange assembly (supplied by user)
•
transmitter with electronics and sensors for O
2
and COe
•
back purge system (option) for high dust conditions
Æ
only for site with flying ash type of dust
•
pneumatic device (option) for automatic calibration
For higher temperature, less then 2.000
o
F (1.200
o
C), but higher then 1.200 ° F (650 °C), the model OMS420RT with alloy AISI300
steel is recommended.
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