VICI 340 Dynacalibrator - Manual (Page 29)

25
Analyzer Calibration
After the power-up procedure has been completed and the chamber tempera-
ture and permeation device have reached equilibrium, the Dynacalibrator is
ready to be connected to the analyzer being calibrated. Use a minimum length
of tubing for the connection, and make sure none of the calibrator’s vents are
blocked.
1. Place the Dynacalibrator in the ZERO mode.
2. Connect the calibrator’s stream outlet to the input of the analyzer. Since zero
air from the Model 340 is the dilution stream, the dilution flow control valve
must be open. Make sure that the total flow of zero air (as indicated by the
dilution flowmeter alone) exceeds the suction rate of (all) the analyzer(s)
being calibrated.
3. The usual flow rate setting is the one which was calculated for the first span
point. Align the center of the float in the flowmeter to the selected scale read-
ing. Allow the analyzer reading to stabilize (usually about ten minutes) before
calibrating or recording the reading.
4. Place the Dynacalibrator in the SPAN mode.
5. Adjust the dilution flow control valve for each of the pre-calculated span points,
aligning the center of the float in the dilution flowmeter to the selected scale
reading. Allowing the analyzer reading to stabilize after each flow adjustment.
If the Dynacalibrator will be remotely programmed with a timer-sequencer, the
timer must be adjusted to allow sufficient analyzer stabilization time at the zero
and at the span calibration points.