Teledyne 3000ZA, Operating Instructions Manual, Page: 44 / 81

Operation 3000ZA
Teledyne Analytical Instruments 32
4.3.1 Tracking the Oxygen Readings during
Calibration and Alarm delay
The user has the option of setting the preference as to whether the
analog outputs track the display readings during calibration or not. To
set the preference, press the System key once and the first System menu
will appear in the VFD display:
TRAK/HLD Auto-Cal
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TRAK/HLD
should be blinking. To enter this system menu press the
Enter key once:
Output Sttng: TRACK
Alarm Dly: 10 min
—or—
Output Sttng: HOLD
Alarm Dly: 10 min
In the first line,
TRACK
or
HOLD
should be blinking. The operator
can toggle between
TRACK
and
HOLD
with the Up or Down keys. When
TRACK
is selected, the analog outputs (0-1 VDC and 4-20 ma) and the
range ID contacts will track the instrument readings during calibration
(either zero or span).
TRACK
is the factory default.
When
HOLD
is selected, the analog outputs (0-1 VDC and 4-20 ma)
and the range ID contacts will freeze on their last state before entering
one of the calibration modes. When the instrument returns to the
Analyze mode, either by a successful or an aborted calibration, there
will be a three-minute delay before the analog outputs and the range ID
contacts start tracking again.
The concentration alarms freeze on their last state before entering
calibration regardless of selecting
HOLD
or
TRACK
. But, when
HOLD
is
selected the concentration alarms will remain frozen for the time
displayed in the second line of the
TRAK/HLD
menu after the analyzer
returns to the Analyze mode.