Cosa 9610 - Air Orifice Selection; Opening of Shut-Off Valves; Setting of Gas Pressure Reducer; Adjusting Flow with Flow Meters

INSTALLATION, OPERATION AND MAINTENANCE MANUAL – COSA 9610™
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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 based on the desired range of measurement.
The COSA 9610™ is standard equipped with the following
orifices:
• Gas: .0079” to .018” (0.2 mm to 0.3 mm).
• Air: 0.55”/0.60”/0.65”/0.70”/0.75” for a dual range version extended with
.80”/.85” and .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 O2 %); can be carried out by giving the booster
relay a positive or negative offset.
3.1.3. Opening of shut-off valves
Open the shut-off valve with identification plate "instrument air supply".
3.1.4. Setting of gas pressure reducer
Turning the adjusting cap clockwise can raise the pressure of the gas pressure
reducer. The set outlet pressure can be read immediately from the pressure indicator
mounted on the reducer.
Set the output gas pressure to 30 PSIG.
3.1.5. Adjusting flow with flow meters
Unscrew the needle valve of bypass flow regulator completely (turn CCW). Use the
"By-pass flow meter" needle valve; throttle back the flow so that the "Analyzer flow
meter" shows a flow of 50 liter/hr (800 CCM or 1.8 CFH). Noting that the max flow is