RADIOMETER ABL90 FLEX User Manual

5. Sensors and optical system ABL90 FLEX reference manual
5-26
Calibration of the pCO
2
sensor
The pCO
2
sensor is calibrated by determining the sensitivity from 2-point
calibrations. Calibration measurements are performed on two levels of solution.
Slight variations in sensor performance between calibrations are addressed by
performing a measurement on CAL 1 within every sample measurement
process.
The ABL90 FLEX analyzer is equipped with a solution pack. This pack contains
precision-tonometered fluids. The tonometry calibration gas mixture is of a
known composition.
The partial pressure of CO
2
(pCO
2
) and the solution pH values are known and
contained in the solution pack smart chip.
The sensitivity is calculated in the following way and expressed as the
percentage of the theoretical sensitivity, calculated from the sensor signal of the
two calibration solutions (mV) and the nominal calibration values:
cal2 cal1
2
10
2
mV mV
S
CO (cal2)
61,5mV lo
g
()
CO (cal1)
p
p



Status is defined as the sensor signal of CAL 1 (rinse): mV
1
.
Introduction
Calibration
levels
Sensitivity

RADIOMETER ABL90 FLEX Specifications

General

Brand	RADIOMETER
Model	ABL90 FLEX
Category	Measuring Instruments
Language	English