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Calibration 5
If a problem is encountered during calibration and the instrument
cannot span calibrate, the data from the last successful calibration will be
restored, if possible. A series of messages will be displayed on the screen
informing the user why the calibration failed and if the old values have
been restored. See Section 6 Maintenance.
5.4
AUTO Calibration
The IR7000 has a built-in auto calibration routine. To use this
feature, the user must install a solenoid valve on each of the calibration
gas sources. Electrical connections for the solenoid valves are made on the
rear panel at the Zero and Span Valve terminals. See Section 3 for
installation instructions.
The calibration sequence is handled automatically but certain
parameters must be set up for the feature to work properly.
NOTE:
It is necessary to perform a MANUAL CALIBRATION at least once
prior to using the AUTO CALIBRATION feature for the first time. This
is to establish an "appropriate" CAL DELAY period. The default value
for CAL DELAY is known to be invalid for many applications. It, in all
likelihood, is not the optimum value for your setup. You must run a
MANUAL CALIBRATION to determine the proper delay period. See
Section 4-2 for instructions in determining the optimum CAL DELAY
value.
•
Enter an appropriate CAL DELAY in the
SETUP/CALDELAY.
NOTE:
Without an appropriate CAL DELAY period, the calibration data will
most likely be invalid since the sample cell would not have been
properly purged.
•
Make sure that the proper concentration for the span gas being
used has been entered into the SETUP/CALGAS submenu.
•
If an O
channel is present, make sure that the concentration of
2
the O
bearing span gas has been entered into the SETUP/O2
2
CALGAS submenu.
•
If periodic calibration is desired, enter the type of calibration
(ZERO or FULL), and the number of hours between
calibrations in the SETUP/CAL TIME submenu.
NOTE:
Setting the time to 0 turns the autocalibration feature off.
50
Teledyne Analytical Instruments., - Rev. 3
IR7000
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