EC900 Series Operation Manual
V.4.1
www.systechillinois.com
Page
22
13.3 Automatic Calibration option
1.
Connect the certified gas to the „cal gas‟ connection on the rear panel of the analyzer or
appropriate valve connection if using remote Autocal. Ensure the pressure is set to the same
pressure as the sample gas to obtain the same flow rate.
2. Set ACAL in the main menu to the oxygen value of the certified gas.
3. Set Acd in the main menu to the desired interval, in hours, for Auto-calibration
When automatic calibration is activated the instrument will sample the certified gas for 15 minutes
before performing the calibration. During this time the display will read the currently measured value
of the certified gas.
The settling time can be modified via the USB connection using the command CALTIM= (See section
14, USB Comms Port).
Following auto-calibration a fault alarm will appear if the measured value of oxygen does not achieve
a certain band around the ACAL value within the settling time allowed. The acceptable band can also
be modified using USB comms with the command CALBAND=x, where x=0 to 999 (default 100)
expressed as a percentage of the ACAL value.
NOTE
EC9x1
EC9x2
Great care should be taken not to allow air to enter the analyzer. If the certified gas contains low ppm
levels and air has entered the system, it could take several hours for the oxygen value to equilibrate.
The instrument will only tolerate a certain level of adjustment. If the analyzer reads 4.9ppm and the
certified bottle is 12.6ppm, the analyzer will reject the input of a value of 12.6ppm because it
considers the error to be too large. Something else is almost certain to be incorrect. Ensure the
sample from the bottle is at equilibrium and there are no leaks in the connection from the certified gas
cylinder to the instrument. It will take many minutes, even hours, to sweep all the air out of the
pressure regulator and sample lines connected to a cylinder of a few ppm oxygen.
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