User guide

<5. INSTALLATION AND WIRING>5-5 5-6
IM 11Y01B01-01E-A 6th Edition :Feb 13, 2013-00
5.5.1 Process Window Purge Gas Connection
In order to keep the process windows clean (prevent fouling by process gas) it is necessary to purge the
windows with a clean dry gas of sufciently low dew point.
When measuring Oxygen, Nitrogen should be used for purging the windows. The purge gas or nitrogen should
be clean (<0.5 μ particulate), dry (-40˚C dew point), oil free.
The process anges are provided with two diagonally opposed inlet ports (typically ¼” OD tube). Use Swagelok
(or equal) double ferrule tube ttings and connect both ports with ¼” OD stainless steel tubing to the purge gas
supply. The exact purge gas ow rate will be dependant upon the process conditions that exist at the ange
connection and therefore, the ow rate could be anywhere from 5lts/min to 50lts/min
(~10 SCFH to ~100 SCFH).
Ensure the purge gas line is clean and dry prior to connecting to the ange to ensure any condensate or
debris is not blown on to the windows at initial start-up. The same applies to both Launch Unit and Detect
Unit process anges, with and without any insertion purge tubes installed.
5.6 Mounting the Process Interface – standard 2”, 3”. 4” 150# ANSI RF or DN - 50/80
Alignment Nuts (x8)
Analyzer Quick Connect
Window Purge Port (x2)
Alignment Bellows
Alignment Studs (x4)
Analyzer Mounting Flange
Process Flange
Figure 29 3” 150# Welded Metal Bellows Alignment Flange Shown above, with analyzer quick connect