INSTALLATION, OPERATION AND MAINTENANCE MANUAL – COSA
9610™
9 | Page
After the mixing chamber, the mixture flow is divided into an excess flow to vent and a
flow to oven. The flow to the burning oven will be approximately 30-50 Nl/hr (500 - 800
Ncc/min). The vented stream is approximately 500 Nl/hr (8000 Ncc/min) with a maximum
1000 Nl/hr (16,000 Ncc/min).
1.3. CALIBRATION PROCEDURE
The analyzer can be calibrated in three different ways:
•
Single point calibration
Only one calibration gas is used. The value of the gas is chosen middle of the
measuring range. This is only used to correct any offset error to the measurements.
•
Two-point calibration
Two calibration gases are used. The low calibration gas is set at ± 20% of the
measuring range. The high calibration gas is set at ± 80% of the measuring range.
The advantage over a single point calibration is the increased accuracy over the entire
span.
•
Three-point calibration
This method uses three calibration gases and is mandatory for a dual range analyzer.
The medium range calibration gas must be in the middle of the measuring range.
All three calibration methods can be performed both manually and automatically:
•
Manually
The operator navigates the procedure via on-screen menu to open the correct gas
valves to the analyzer. The operator controls the timing.
•
Automatically
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