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Trace Oxygen Analyzer Operation
Teledyne Analytical Instruments 35
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.
The factory default is three minutes, but the delay time is program-
mable. To adjust to delay time use the Left or Right arrow keys. When
the time displayed on the second line blinks, it can be adjusted by
Pressing the Up or Down keys to increase or decrease its value. The
minimum delay is 1 minute, the maximum is 30.
This preference is stored in non-volatile memory so that it is
recovered if power is removed from the instrument.