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8.
Appendix
8.1
Error Limits
Message description
Measured value out of range
Cal. 1 out of range
Cal. 2 out of range
8.2
Algorithm for O
The (reading in ppm or mg/L) is given by the following equation:
I
converted sensor current during measurement
I
:
sensor residual current (assumed to be zero)
0
c:
O
concentration (ppm or mg/L)
2
c
:
O
solubility in water (mg/L) at p
s
2
p
:
standard pressure (1013 mbar)
n
p
:
water vapor pressure at calibration temperature (mbar)
w
X
:
molar ratio of O
in calibration gas (in air equal to 0.2095)
O2
2
S
:
sensor slope (pA/mbar)
L
Sal:
salinity of measuring solution (g/kg)
F(T): temperature dependant salinity correction factor, see Section 8.3.
To calculate the saturation [%], the term
is replaced by 100%
S
the sensor slope is determined in the calibration using the following equation:
L
METTLER TOLEDO SevenGo pro™ dissolved oxygen
Range not accepted
[O
]:
< 0.1% or > 600%
2
[O
]:
< 0.01 mg/L or > 99 mg/L
2
[O
]:
< 0.01 ppm or > 99 ppm
2
I:
< 40 nA or > 110 nA
T:
< 0 nA or > 2 nA
concentration measurement
2
, see Section 8.3
n
Appendix
21
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