Point Calibration; Figure 27 2 Point Calibration Page - Michell Instruments XTP601 User Manual

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.
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2. Press
ENTER
to de-select.
3. Press
ENTER
) 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
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
3 times. Ensure that the Adjusted value equals the REF Gas 1 value
(±0.01%). Press
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
) 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
8. Ensure that the Adjusted value at the bottom of the page has stabilized.
9. Press
ENTER
3 times. Ensure that the Adjusted value now equals REF Gas 2 value
(±0.01%). Press
Menu.
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Figure 26 2 Point Calibration Page
to highlight CAL TYPE and set to 2 POINTS. Press
to highlight REF GAS 1 and use the
to highlight ACTUAL 1 value and press the
to de-select.
ENTER
to highlight REF GAS 2 and use the
to highlight ACTUAL 2 value and press the
to de-select. Press
ENTER
XTP601 User's Manual
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() and
Up
to de-select.
ENTER
Up
() and
Up
to de-select.
ENTER
Up
to return to the Main
ESC
97313 Issue 5, May 2018
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ENTER
Down
() button
Down
() button