Michell Instruments XTP601, User Manual

Page: 32 / 64

XTP601 User’s Manual
24 97313 Issue 5, May 2018
CALIBRATION
3.2 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 26 2 Point Calibration Page
2. Press
ENTER
to highlight CAL TYPE and set to 2 POINTS. Press
ENTER
to de-select.
3. Press
ENTER
to highlight REF GAS 1 and use the
Up
(

) and
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
to de-select.
4. Ensure the Adjusted value at the bottom of the page has stabilized
NOTE: 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
to highlight ACTUAL 1 value and press the
Up
(

) button
3 times. Ensure that the Adjusted value equals the REF Gas 1 value
(±0.01%). Press
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).
7. Press
ENTER
to highlight REF GAS 2 and use the
Up
(

) and
Down
(

) buttons to match the value of the concentration of the upper
calibration gas. NOTE: This value only needs to be set when
using a new gas cylinder. Press
ENTER
to de-select.
8. Ensure that the Adjusted value at the bottom of the page has stabilized.
9. Press
ENTER
to highlight ACTUAL 2 value and press the
Up
(

) button
3 times. Ensure that the Adjusted value now equals REF Gas 2 value
(±0.01%). Press
ENTER
to de-select. Press
ESC
to return to the Main
Menu.