Teledyne 3000ZA - Trace oxygen analyzer - Manual (Page 44)

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
PSWD Logout More
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.