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Trace Oxygen Analyzer Operation
Teledyne Analytical Instruments 33
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 3000ZA is acurate to 2-3 %. Accordingly, internally
scheduled calibrations can vary 2-3 % per day.
To setup an Auto–Cal cycle:
Choose System from the Function buttons. The LCD will display
five sub functions.
TRAK/HLD Auto—Cal
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Use __ arrows to blink Auto—Cal, and press Enter. A new screen
for Span/Zero set appears.
Span OFF Nxt: 0d 0h
Zero OFF Nxt: 0d 0h
Press __ arrows to blink Span (or Zero), then press Enter again.
(You won’t be able to set OFF to ON if a zero interval is entered.) A
Span Every ... (or Zero Every ...) screen appears.
Span Every 0 d
Start 0 h from now
Use __ arrows to set an interval value, then use __ arrows to move
to the start-time value. Use__ arrows to set a start-time value.
To turn ON the Span and/or Zero cycles (to activate Auto-Cal):
Press System again, choose Auto—Cal, and press Enter again. When the
Span/Zero values screen appears, use the __ arrows to blink the Span (or