OPERATING MANUAL OXYGEN MONITORING SYSTEM
OMS 420
15
7.3.3
High temperature model OMS420HT (# 63467HT)
This model shall be used at sites with clean and high temperature flue gas, less then 3.100 °F (1.700 °C)
High temperature model components are:
•
probe with ceramic tube, ejector and flange (ANSI150 or DN80 or DN65)
•
mounting flange assembly (supplied by user)
•
detector head with junction box for sensors O
2
and COe
•
transmitter with electronics and switched power supply
•
special cable between junction box and transmitter
•
pneumatic device (option) for automatic calibration
•
back purge is not available for this model
The main differences between the remote transmitter model and the high temperature models are:
•
the use of ceramic tube of sampling probe on the high temperature model
•
the use of an ejector (air jet pump) to draw sample to the sensors..
When the ejector is purging instrument air with some 300 l/ h, a negative pressure on the back-side of a nozzle will be created.
The negative pressure draws the sample gas from the tip of ceramic tube to the sensors.
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