INSTALLATION, OPERATION AND MAINTENANCE MANUAL – COSA
9610™
11 | Page
9. Medium calibration gas is switched off and the high calibration gas is switched on.
10.
The analyzer waits for the readings to stabilize up to the “Switch Time”.
11.
High calibration gas is switched off and the process gas is switched on.
12.
Analyzer deactivates calibration/validation contact.
Between each step of the calibration process a switch time is programmed enabling the
analyzer to stabilize. After the switch time the new value is used in the calibration
algorithm. The calibration gas switch time is user programmable. By default, it is set at
120 seconds. Depending on the distance to the calibration gases it may be necessary to
change to a longer or shorter delay.
1.4. EXTENDED (DUAL) RANGE OPTION
1.4.1. Operation
When the measuring range of the analyzer is larger than 1150BTU/SCF, an
extended range option is available which covers a Wobbe index of 2730.BTU/SCF.
This is accomplished by adding a second gas-mixing orifice and selection valves to
make changeover possible.
The dilution ratios of each mixing orifice are chosen such that the measuring ranges
overlap.
Via the software it is possible to create a 4/20mA current loop signal that covers the
whole range. It is necessary to establish a switch over point that must be calibrated.
For this reason, the calibration system is expanded with an extra solenoid valve.
1.5. SPECIFICATIONS COSA 9610™ WOBBE INDEX ANALYZER
1.5.1. Analyzer performance
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