Teledyne 3020T Trace Oxygen Analyzer Operation AUTO-CALFunction, PWD Password Function

Trace Oxygen Analyzer Operation 4

4.3The AUTO-CALFunction

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-CALtiming, use external AUTO-CALcontrol where possible. The internal clock in the

Model 3020T is accurate to 2-3 %. Accordingly, internally scheduled calibrations can vary 2-3 % per day.

To setup an AUTO-CALcycle:

Scroll to AUTO-CAL, and ENTER. A new screen for Span/Zero set appears.

Span OFF Nxt: 0d 0h

Zero OFF Nxt: 0d 0h

If SPAN (or ZERO) is not between the arrows, scroll with DOWN/UP

control to SPAN (or ZERO), then ENTER. (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 DOWN/UP control to set an interval value, and ENTER. Then use DOWN/UP to set a start-time value, and ENTER.

To turn ON the Span and/or Zero cycles (to activate AUTO-CAL): Scroll to Auto—Cal,and ENTER it again.

Span OFF Nxt: 0d 0h

Zero OFF Nxt: 0d 0h

When the Span/Zero values screen appears, use the scroll DOWN to blink the OFF/ON field of the SPAN (or ZERO) function. Use DOWN/UP to set the OFF/ON field to ON. You can now turn these fields ON because there is a nonzero span interval defined.

4.4The PWD (Password) Function

Security can be established by choosing a 5 digit password from the standard ASCII character set. If you decide NOT to employ password security, use the default password TETAI. This password will be displayed automatically by the microprocessor. The operator just ENTERs it to be allowed total access to the instrument’s features.

Teledyne Analytical Instruments 4-5