Algorithm For Oxygen Concentration Measurement - Mettler Toledo SevenGo Duo pro SG68 Instrucciones De Manejo

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11.2 Algorithm for oxygen concentration measurement

The (reading in ppm or mg/L) is given by the following equation:
I
I
0
c
c
s
p
n
p
w
X
O2
S
L
Sal
F(T)
To calculate the saturation [%], the term
is replaced by 100%
S the sensor slope is determined in the calibration using the following equation:
L
S
L
I
cal
I
0
X
O2
p
cal
rH
p
w
pH/ORP/Ion/DO meter SG68
1.680 4.003
1.684 4.010
1.688 4.019
1.694 4.029
1.700 4.042
1.706 4.055
Converted sensor current during measurement
Sensor residual current (assumed to be zero)
O concentration (ppm or mg/L)
2
O solubility in water (mg/L) at p
2
Standard pressure (1013 mbar)
Water vapor pressure at calibration temperature (mbar)
Molar ratio of O in calibration gas (in air equal to 0.2095)
2
Sensor slope (pA/mbar)
Salinity of measuring solution (g/kg)
Temperature-dependant salinity correction factor (see "Solubility of oxygen in water as a
func tion of temperature and salinity")
Sensor slope (pA/mbar)
Converted sensor current during calibration
Sensor residual current (assumed to be zero)
Molar ratio of O2 in calibration gas (in air equal to 0.2095)
Pressure of calibration gas (air pressure, in mbar)
Relative humidity of calibration gas (0.0É1.0)
Water vapor pressure at calibration temperature (mbar)
6.864 9.182
6.852 9.142
6.844 9.105
6.838 9.072
6.834 9.042
6.833 9.015
, (see Section 8.3)
n
Appendix
12.460
12.292
12.130
11.975
11.828
11.697
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