Michell Instruments XTC601, Руководство пользователя, Страница: 42 / 80

XTC601 User’s Manual
32 97400 Issue 6.1, November 2020
CALIBRATION
3 times. Ensure that the Adjusted value is now equal to the REF 1 value
(±0.01%). Press
ENTER ENTER
to de-select. Press
ESC ESC
to return to the Main
Menu.
6. The Adjusted reading will now be the same as that displayed on the
Main Page and be equal to the calibration gas.
7. The calibration process is complete. Return to sampling the process
gas.
3.6 2-Point Calibration
This is a 2-point adjustment that is overlaid on top of the factory calibration. It is
designed to correct minor drift and minor changes during transit. This calibration makes
the unit more accurate throughout the range than the single point calibration.
1. Apply the lower calibration gas and purge the unit for at least 5 minutes.
View the chart until a flat line shows for 1–2 minutes.
t t-2
21
6
%
t t-2
7
6
%
Figure 32 2-Point Calibration Page
2. Press
ENTER ENTER
to highlight CAL TYPE and set to 2 POINTS. Press
ENTER ENTER
to de-select.
3. Press
ENTER ENTER
to highlight REF GAS 1 and use the
Up Up
(

) and
Down Down
((

) buttons to match the value of the concentration of the lower
calibration gas. NOTE: This value only needs to be set when
using a new gas cylinder. Press
ENTER ENTER
to de-select.
4. Ensure the Adjusted value at the bottom of the page has stabilized
NOTE: The value displayed does not change but there will be
a ~ symbol next to 'Adjusted' while the reading is stabilizing.
When the ~ symbol disappears the reading will be stable and
the next change can be made.
5. Press
ENTER ENTER
to highlight ACTUAL 1 value and press the
Up Up
(

) button
3 times. Ensure that the Adjusted value is now equal to the REF 1 value
(±0.01%). Press
ENTER ENTER
to de-select.
6. Apply the upper calibration gas and purge the unit for at least 5
minutes. View the chart until a flat line shows for 1–2 minutes (see
above).