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Page 55
UVTOCCommissioning.fm
Commissioning the Analyzer
Section 4 Commissioning the Analyzer
4.1 Precomissioning Requirements
Before you begin this procedure:
1. Ensure all relevant procedures in Section 2 Unpacking, Installation, and
Setup on page 27 have been completed.
2. Refer to Section 3 on page 49 to prepare and connect the reagents and
calibration solutions needed to complete the commissioning.
The incoming pressure MUST be
above 276 kPa (40 psi) or a NO
CARRIER GAS fault may occur.
3. If an optional air purifier is used, switch on the carrier gas. See Appendix
D Accessories on page 171 for the optional purge gas generators. Both
electrical and pneumatically driven purifiers are available. In Class I Div 2
applications the pneumatic purifier should be used. Ensure that the output
of these gas purifiers is set to 3.1 bar (45 psig) but no higher than 3.8 bar
(55 psi). Alternatively, a 300 SCF bottle of CO
2
free air or nitrogen may be
used, and will last between 2–3 weeks.
4. Adjust the carrier gas pressure within the instrument to 172 kPa (25 psi).
The adjustment knob is behind the sparger. The knob in front of the
sparger is the reactor carrier gas knob.
4.2 Start–up Instructions
4.2.1 Start the Liquids and Gas Flowing
The instructions presented here
assume that the fluid (reagents and
standards) and carrier gas
connections have been made as
outlined in the previous sections.
1. Power up the analyzer if necessary. After a start-up period that includes
an identification of your analyzer type, the unit will display Purging. At this
time, confirm that the analyzer has the correct range for your application.
2. Pumps will start rotating. Sample tubes (large bore) and reagent tubing
(small bore) should begin filling with liquid. Allow the analyzer to run for
30 minutes. Thoroughly inspect the instrument for leaks.
3. During this time, the IR Detector will reach the operating temperature of
50 °C (120 °F) and the following can be verified:
A slightly purple reflection can be
seen in the bottom, right-hand side
of the liquids enclosure when the
lamps are operating. (A mirror or
reflective surface and a darkened
room aids in viewing the slightly
purple glow).
• Reagent weights are submerged
• There are no bubbles in small
1
/
8
-in. bored tube to left of sparger
(bubbles in this tube will cause NO SPARGER FLOW faults).
• The ½-in. wide vertical chamber in the sparger manifold is full of
bubbles (TOC analyzers only). This is where the rising gas “bubbles
out” the inorganic carbon in the acidified sample. A portion of the
acidified sample falls down this tube to be resampled by the
Resample Pump. The excess exits the top of the sparger (not visible
from front of unit).
• There are no bubbles in the small
1
/
8
-in. bored tube within the
UV Reactor manifold (bubbles in this tube will cause NO UV
FLOW faults).
• The bottom of the GLS “U-tube” is full of liquid and is overflowing to
the main drain (this drain should be open to ambient, and should not
experience back pressure).