Vaisala MGP260 Series, User Manual, Page: 51 / 92

8. Calibration
8.1 Calibration recommendations
The recommended calibration interval for MGP260 probes is 1 year.
To reach the best calibration and adjustment accuracy, it is recommended to use the traceable
calibration and adjustment services provided by Vaisala. For an overview of the available
calibration options, see
Calibration overview (page 49) .
8.2 Calibration overview
The methane (CH
4
) and carbon dioxide (CO
2
) measurements of MGP260 can be calibrated and
adjusted using gas references with known values. You can also calibrate and adjust the probe's
internal temperature measurement (used for environmental compensation only). The H
2
O
measurement can only be adjusted at the low end (simultaneously with CH
4
and CO
2
when a
zero point adjustment is made).
Carrying out calibrations and adjustments requires connecting MGP260 to Vaisala Insight PC
software (requires Vaisala USB cable 257295). For instructions on connecting the probe to
Insight, see
Connecting to Insight software (page 35) .
To feed reference gases to MGP260 in a controlled manner when calibrating and adjusting, use
a flow-through adapter. An MGP260 flow-through adapter is available as an optional
accessory: for more information, see
Flow-through adapter (page 50) .
Before removing the probe from the process for calibration and
adjustment, review the instructions in Removing probe from process
(page 59) .
WARNING!
The following calibration and adjustment options are available when the probe is connected to
Vaisala Insight PC software:
• Methane (CH
4
) and carbon dioxide (CO
2
) measurement calibration and adjustment (1-
point or 2-point adjustments).
• Temperature measurement adjustment (probe's internal sensor measurement used only
for environmental compensation).
• Zero point adjustment for all gas measurement parameters (CH
4
, CO
2
, and H
2
O: adjusts all
parameters simultaneously). Zero point adjustment replaces the low end adjustment of all
gas parameters in 2-point adjustments.
• Reset to factory adjustment (given separately for each parameter).
Chapter 8 – Calibration
49
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