Teledyne BDS-3000 - Oxygen analyzer - Manual (Page 52)

Operation BDS 3000
Teledyne Analytical Instruments 38
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
programmable. 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.
4.3.2 Setting up an Auto-Cal
When proper automatic valving is connected (see Chapter 3,
Installation), the Analyzer can cycle itself through a sequence of steps
that automatically calibrates the instrument.
Note: If you require highly accurate Auto-Cal timing, use external
Auto-Cal control where possible. The internal clock in the
Model BDS 3000 is accurate to 2-3 %. Accordingly,
internally scheduled calibrations can vary 2-3 % per day.
To setup an Auto–Cal cycle: