Cosa 9610, Installation, Operation And Maintenance Manual

Page: 23 / 51

INSTALLATION, OPERATION AND MAINTENANCE MANUAL – COSA 9610™
Page 23 of 48
3. IN OPERATION
3.1. S
TART
-U
P
S
AMPLE
C
ONDITIONING
S
YSTEM
The sample conditioning system is located in the left-hand compartment. This chapter
describes how the components of the sample conditioning system should be set up, in
correct order, so a perfect start-up of the total analyzer system can be achieved. The
instructions hereunder should be performed step by step.
3.1.1. Inspection, visual and external connections
Perform a visual inspection of the system and close all shut-off valves in the system.
Check the connecting fittings of the supply tubes to be correctly fitted and are not
leaking. This can be checked quite simple by unscrewing the nut from the fitting and
then check if "Front and Back ferrule" of the fitting are able to rotate but cannot be
moved in an axial direction. If this is not the case, this tube must be renewed. Then turn
the nut by hand and afterwards tighten it a 1/4 turn with a suitable spanner. The supply
and drainage tube can now be connected.
Because the supply line is under pressure and has been closed off on the COSA 9610™
side, the connecting fittings can be squirted with soap in order to detect any possible leaks.
When bubbles appear this indicates a leak and the tube concerned must immediately be
closed off at the supply point. Inspect the fitting and tube, replace components when
necessary.
3.1.2. Air orifice selection
Before the COSA 9610™ is set into operation, the range of measurement must be
established. The air orifice is selected on the basis of the desired range of measurement.
The COSA 9610™ is standard equipped with the following orifices:
•
Gas: .0079 in to .0118 in (0.2 mm and 0.3mm)
•
Air: 0.55/0.60/0.65/0.70/0.75 for a dual range version extended with 0.80/0.85 and
0.90.
Relationship of pressure differential (gas/air) versus Wobbe-Index with different air
orifices and a fixed residual oxygen concentration of 5% (theoretically determined).
It is therefore recommended that a residual oxygen concentration of 2.5% is chosen
corresponding to the reference point. Possible fine-tuning of the reference point, (for the
purpose of attaining the correct O
2
%); can be carried out by giving the booster relay a
positive or negative offset.