Purging Operation - Ametek Thermox 2000 ATEX Series User Manual

Table 3-1.
Combustibles gas
allowable limits.
• Process pressure is assumed to always be sub-atmospheric
(vacuum).
• Your sample gas stream must contain no more than 25% of the
LEL (lower explosive limit) for all combustible gases in your
sample at any time. Otherwise, there is a possibility for the ana-
lyzer to be an ignition source for the process. See Table 3-1 for a
list of combustibles gases, and their allowable limits, which is
25% of the LEL for each gas.
C O M B U S T IB LE
G A S
H ydrogen
C arbon M o noxid e

Purging Operation

"Safe" pressure, for purposes of this manual, is defined as a mini-
mum .25 inch of water column.
NOTE
Regulator may be in the locked position upon arrival. To adjust
regulator, pull handle to outward position.
Carefully insert T-bar valve key to align valve stem tip of both
valves. Practice locking and unlocking key in the RECV valve
stem. Practice and familiarization of this process should ease
operation of the system.
To test the vent's operation, gently prod the vent flapper open with
a soft pointed object (example: eraser end of a pencil) ensuring that
the vent valve works freely. On vertically configured vents, this
can be accomplished from within the protected enclosure.
G A S A L L O W A B L E
L IM IT
1%
3%
Installation
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3-13