Teledyne 2020 - Explosion proof thermal conductivity analyzer - Manual (Page 40)

4 Operation Model 2020
4-6 Teledyne Analytical Instruments
a function takes the analyzer back to the previous screen, or to the ANA-
LYZE Function, depending on the function escaped.
reproduced, at the appropriate point in the procedure, in a
Mono-
spaced type style. Push-button names are printed in
Oblique type.
4.3.1 Setting the Display
If you cannot read anything on the display after first powering up:
1. Observe LED readout.
a. If LED meter reads all eights and dots, go to step 3.
b. If LED meter displays anything else, go to step 2.
2. Disconnect power to the Analyzer and reconnect again. LED
meter should now read all eights and dots.
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 auto-
matically zero and span the instrument.
Note: Before setting up an AUTO-CAL, be sure you understand the
Zero and Span functions as described in section 4.4, and
follow the precautions given there.
Note: If you require highly accurate AUTO-CAL timing, use external
AUTO-CAL control where possible. The internal clock in the
Model 2020 is accurate to 2-3 %. Accordingly, internally
scheduled calibrations can vary 2-3 % per day.
Note: If your ranges are configured for different applications, then
AUTO-CAL will calibrate all of the ranges simultaneously (by
calibrating the Cal Range).
To setup an
AUTO-CAL cycle:
The VFD will display five subfunctions.
Contrast Function is DISABLED
(Refer to Section 1.6)