Baker Hughes Panametrics Aurora H2O, User Manual

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6.2 Cleaning the mirror
The Aurora H2O analyzer may provide the message weak
signal return - check mirror on the top line of the display,
along with the red light “!” to the left of the main display.
If this occurs, the mirror and/or the optical window of the
measuring cell may be contaminated due to liquid or
particulate coating/deposition.
NOTE: Reagent grade acetone (cas no. 67-64-1) may
be needed for the cleaning process. The reagent is not
supplied as part of the Aurora maintenance kit, and you
must obtain the reagent from a local chemical supplier.
If the error condition check mirror is indicated, the first step
is to clean the mirror. The process is as follows:
1. Turn the power to the Aurora H2O OFF.
2. Shut down the gas flow through the optical
absorption cell.
a. Turn the inlet isolation needle valve (item 4 in
Figure 2 on page 3 or Figure 3 on page 4) to
the closed position.
b. Ensure that the sample flow rotatmeter indicates
zero flow.
3. Wear a pair of disposable static dissipative Latex
or Nitrile (powder free) gloves.
NOTE: There are two versions of the Aurora optical
absorption cell assembly (see Figure 78 below), each
with its own mirror mounting mechanism. The mirror
can be removed from the end of this cell for cleaning
without dismounting the cell. Be sure to follow the correct
mirror cleaning procedure for your version of the optical
absorption cell assembly.
CAUTION!
Class 1m invisible laser radiation when
open. Do not view directly with optical
instruments.
WARNING!
Use of controls or adjustments or
performance of procedures other than those
specified herein may result in radiation
exposure that is more hazardous than
specified.
Figure 78: Style 1 (left) and style 2 (right) optical absorption cell/mirror assemblies
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