Teledyne BDS-3000 - Oxygen analyzer - Manual (Page 53)

Oxygen Analyzer Operation
Teledyne Analytical Instruments 39
CAUTION: FREQUENT ZERO ADJUSTMENTS OF THE CELL IS
NOT RECOMMENDED. A NEWLY INSTALLED CELL
MAY TAKE 7-10 DAYS OF OPERATION TO REACH A
STEADY ZERO (TYPICALLY LESS THAN 5 PPB). IF
REQUIRED, THE INSTRUMENT MAY BE ZEROED
AFTER THIS INITIAL STABILIZING PERIOD AND MAY
BE CHECKED AGAIN AFTER AN ADDITIONAL 7-10
DAY PERIOD. THE FREQUENCY OF ZERO
ADJUSTMENT IS AT THE DISCRETION OF THE
USER (ONCE A MONTH IS SUGGESTED).
Choose System from the Function buttons. The LCD will display
five subfunctions.
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 DÑ 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 Zero) OFF/ON field. Use _ arrows to set the OFF/ON field to
ON. You can now turn these fields ON because there is a nonzero span
interval defined.
4.3.3 Password Protection
If a password is assigned, then setting the following system
parameters can be done only after the password is entered: span and zero
settings, alarm setpoints, analysis range definitions, switching between
autoranging and manual override, setting up an auto-cal , and assigning a