Roche cobas b 123 - Monitoring; Oximeter Calibration; Recalibration; Standby Calibration

Roche Diagnostics
226 Instructions for Use · Version 13.0
8 Calibration cobas b 123 POC system
Automatic calibrations
Recalibration
Recalibrations are carried out after each measurement. The measurement parameters
are calibrated using a standby solution.
Oximeter calibration
Oximeter calibration consists of a wavelength calibration of the polychromator, and a
calibration of the integration time and layer thickness calibration of the cuvette.
(1)
Wavelength calibration of the
polychromator
It is performed during the system calibration. The known intensity maxima of the
built-in neon lamp, which is used as the spectral light source, is used as a reference to
calibrate the measured signal from the module.
A shortened wavelength calibration of the polychromator (1P calibration) occurs
with each measurement.
Calibration of the integration time It is also determined during system calibrations.
Cuvette layer thickness calibration
q
After installing a new Fluid Pack, the cuvette has a 24-hour run-in time. During this time,
layer thickness calibrations are automatically performed at specified times.
It is performed during 2P and system calibrations. The measured absorption of a dye
in the CAL 2 solution is used to calibrate the cuvette layer thickness.
Standby calibration
If a change occurs in a parameter’s status, standby calibrations are performed every
30 minutes at the end of the last 1P calibration. The measurement parameters are
calibrated using the standby solution
(2)
.
Monitoring
If there is a temporary change in the PO
2
status between 2 calibrations, “Monitoring”
is entered in the calibration database, and the PO
2
parameter is set to “Not
calibrated”.
Standby shifting
Standby shifting is the movement of standby solution in the measuring chamber.
This occurs 20 minutes after the last fluidic action (measurement or calibration) on
the instrument. In the calibration database, this is recorded as a STDBY shifting
entry.
(1) For instruments with COOX module only.
(2) Corresponds to BG 1P calibration for USA.