Vici 340 Dynacalibrator Manual do Utilizador descarregar pdf (Página 29)

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.

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