Trace Oxygen Analyzer
Operation
Teledyne Analytical Instruments
31
Show Negative:
The operator selects whether display can
show negative oxygen readings or not.
TRAK/HLD:
The operator sets whether the instrument
analog outputs track the concentration change during
calibration and sets a time delay for the concentration alarms
after calibration
4.3.1 Tracking 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 ▲/▼ 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
