8. Calibration
8.1 Calibration Overview
The methane (CH
4
) and carbon dioxide (CO
2
) measurements of MGP261 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 MGP261 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 MGP261 in a controlled manner when calibrating and adjusting, use
a flow-through adapter. An MGP261 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
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).
The accuracy of field calibration and adjustment is dependent on a number of
factors such as suffcient stabilization time, calibration setup conditions, and
reference quality. To ensure fully accurate calibration and adjustment results, use
the traceable calibration and adjustment services provided by Vaisala.
More Information
‣
Connecting to Insight Software (page 35)
‣
Flow-Through Adapter (page 50)
‣
Removing Probe from Process (page 59)
Chapter 8 – Calibration
49
Содержание MGP261
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