Chapter 1 Overview; Sensor Operations - Ametek Thermox Series 2000 WDG-IV User Manual

Sensor Operations

Designed for fast response in a wide range of flue gas applications, the
sensor mounts directly on the combustion process to provide continuous
measurement of oxygen, or oxygen and combustibles, or oxygen, combus-
tibles and methane.
A sample is drawn from the process stream by means of an air-operated
aspirator and is immediately returned to the process. A portion of this gas
rises past the oxygen measuring cell and combustibles detector and re-
turns to the primary loop. All sample wetted parts are heated to maintain
the sample above the dewpoint of the gas.
Follow these cautions when working on the sensor:
OVERVIEW
Do not turn on the aspirator until the analyzer has been turned on
and is hot - preferably 24 hours. Also, if you turn off the analyzer or
the process is shut down, turn off the aspirator air to avoid plugging
problems!
Remove AC power from the sensor and control unit and allow the
sensor to cool for at least one hour before performing any maintenance
or troubleshooting activities.
The outside of the sensor cover and all sensor assembly components
are hot during normal operation (up to 500° F, 260° C inside the
cover). Allow sensor components to cool for at least an hour before
working inside the sensor. Use caution and wear appropriate gloves
when handling components or when touching the sensor cover!
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Overview 1-1