Teledyne 2020 - Explosion proof thermal conductivity analyzer - Manual (Page 50)

4 Operation Model 2020
4-16 Teledyne Analytical Instruments
Use the UP/DOWN key to toggle between
AUTO and MAN span settling.
Stop when
AUTO appears, blinking, on the display.
Select span
mode: AUTO
Enter to move to the next screen.
Span Val: 2Ш.ШШ %
To begin span
Use UP/DOWN key to change the span setting value.
ENTER will move the blinking field to units (%/ppm). Use UP/DOWN
key to select the units, as necessary. When you have set the concentration of
the span gas you are using,
Enter to begin the Span calibration.
####.##% H2 — N2
Slope=#.### Span
The beginning span value is shown in the upper left corner of the
display. As the span reading settles, the screen displays and updates infor-
mation on
Slope. Spanning automatically ends when the span output corre-
sponds, within tolerance, to the value of the span gas concentration. Then
the instrument automatically returns to the analyze mode.
4.4.2.2 Manual Mode Spanning
Scroll Span by using UP/DOWN key and Enter to start the Span
function. The screen that appears allows you to select whether the span
calibration is to be performed automatically or manually.
Select span
mode: MANUAL
Use the UP/DOWN key to toggle between
AUTO and MAN span
setting. Stop when
MAN appears, blinking, on the display. ENTER to move
to next subfunction screen
Span Val: 2Ш.ШШ %
To begin span
Using the UP/DOWN key changes the span value, as necessary. Enter
to move to the units field (%/ppm). Use UP/DOWN key to select unit.
Press Enter to enter the span value into the system and begin the span
calibration.
Once the span has begun, the microprocessor samples the output at a
predetermined rate. It calculates the difference between successive sam-