CGA351-121 View Datasheet(PDF) - Unspecified
Part Name
Description
Manufacturer
CGA351-121 Datasheet PDF : 133 Pages
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www.DataSheet4U.com
December 2004
Calibrating the Model
CGA 351
Recommended
Calibration Gas
To calibrate the CGA 351 analyzer, the following steps must be
completed:
• introduce the chosen calibration gas
• regulate the calibration gas flow rate
• adjust the calibration setting as required
Proceed with the instructions in this section to calibrate the analyzer.
To properly calibrate the zirconia oxygen sensor, a calibration gas of
known composition must be used. The following calibration gas is
recommended by GE Infrastructure Sensing:
• 5 ppm O2 in N2
IMPORTANT: The gas cylinder must be certified as to the exact
composition of the calibration gas.
A calibration gas containing only CO is not recommended, since the
analyzer will not respond correctly to dry calibration gases that do not
contain H2. However, CO may be used if moisture is added to the gas
by passing it through a saturator or bubbler.
Uncertainty in the oxygen content of the calibration gas may be a
significant source of error in the calibration process. A standard
certificate of analysis has an uncertainty in the smaller component of
±5%. For the recommended calibration gas, this means an oxygen
range of 4.5–5.5 ppm, and the corresponding potential calibration
errors shown in Table 4-1 below are introduced.
ppm O2
4.5
5.0
5.5
Table 4-1: Calibration Uncertainty
T( °C)
mV
∆mV
225.317 +2.209
700
223.108
0.00
221.110
–1.03
%Error
+0.99
0.00
–0.90
As shown in Table 4-1 above, a calibration uncertainty of about
±0.95% is introduced by the calibration gas uncertainty alone.
Setup and Calibration
4-31
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