Percent Oxygen Analyzer Operation 4
4-5Teledyne Analytical Instruments
4.3.2 Setting up an Auto-Cal
When proper automatic valving is connected (see chapter 3, installa-
tion), the Analyzer can cycle itself through a sequence of steps that automati-
cally zero and span the instrument.
Note: If you require highly accurate Auto-Cal timing, use external
Auto-Cal control where possible. The internal clock in the
Model 3000PA is accurate 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 VFD will display five
subfunctions.
Contrast 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 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 new password.
However, the instrument can still be used for analysis or for initiating a self-
test without entering the password.
Contrast Function is
DISABLED
(Refer to Section 1.6)