Plugged Plumbing Check; Aspirator Air Not Pulling Sample From Process - Ametek Thermox Series 2000 WDG-IV User Manual

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6-12 | Thermox Series 2000 WDG-IV / IVC / IVCM
If you see bubbles, it indicates a leak. If using this method be sure to
prevent the liquid from reaching the furnace. If the furnace does get
wet, allow it sufficient time to thoroughly dry.
The WDG-IV style sensor has intentional leaks in the aspirator air
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inlet fitting and the screw in the back of the aspirator block. If you are
having problems and your process is under positive pressure, these
NOTE
intentional leaks will need to be sealed.

Plugged Plumbing Check

Exercise care when working on the sensor. Allow the unit to cool and
wear gloves.
This check does not apply to Insitu users.
Examine the inlet and exhaust for plugging problems. When possible,
rod out the probe and exhaust.
If this doesn't solve the problem, disassemble the analyzer to locate
the plug. Clean the plumbing using hot water and a bottle brush.
When assembly is complete, check for leaks using a leak detecting
liquid.

Aspirator Air Not Pulling Sample from Process

This check only applies for WDG-IV users.
To check the aspirator vacuum level, remove the inlet hook and turn
off the aspirator air.
Attach a vacuum gauge to the aspirator inlet and apply aspirator air.
The aspirator should pull 2 to 3 inches WC at 5 psig. If the aspirator
doesn't pull a vacuum, disassemble sensor plumbing and clean the
nozzle and venturi in the back of the aspirator.
You will need a new metal O-ring when installing the venturi.