Siemens KION Service Manual page 78

Service procedures
Checking flow transducers
The flow transducer "check" performed in the PuC is
actually a calibration of the fresh gas flow transducer
and the expiratory flow transducer.
Fresh gas flow transducer calibration
The fresh gas flow transducer pre-amplifier is located
on PC1748/PC1797 Fresh gas flow. Adjustment of
the pre-amplification (E2-potentiometers) is
performed by CON.
During calibration, the signals are routed via the I2C
bus.
CON PC1748/PC1797
I2C-bus
5
Offset calibration
1. The gas supply from the gas modules are cut-off
and there is no gas flow in the system during
offset calibration of the fresh gas flow
transducer.
2. The fresh gas flow transducers E2-potentiometers
are adjusted during calibration until the measured
flow is close to zero.
3. The Tidal Volume display shows the value: 50.
4. The Exp. Tidal Volume display shows the
measured flow, as a value counting downwards,
by the fresh gas transducer while calibrating
(in 1/10 ml/s).
5 - 6
Transducer
Transducer
signal
Siemens-Elema AB
Gain calibration
5. The fresh gas flow from the AIR (N2O) or O2 gas
modules are 5 l/min (target value) during the gain
calibration of the fresh gas flow transducer E2-
potentiometer.
6. The fresh gas flow transducers E2-potentiometers
are adjusted during calibration until the measured
flow is close to the target value.
7. The Tidal Volume display shows the value: 833
(=83.3 ml/s = 5 l/min).
8. The Exp. Tidal Volume display shows the
measured flow by the fresh gas transducer while
calibrating (in 1/10 ml/s).
9. If acceptance criteria for successful gain
calibration is fulfilled, i.e. measured flow do not
differ more than 0.5% from the target value, the
PuC will continue. If not,the test will Fail, see
Note 1.
Note 1: The result of the calibration are shown on the
KION Monitor as Pass or Fail. Fail means that either
one or both of the fresh gas flow transducer or
expiratory flow transducer calibration failed.
Diagnostic (270) will be shown in the Diagnostic Log
and the CPS/IDS Diagnostic Log if the fresh gas flow
transducer calibration failed.
KION / KION-i
E382 E392E 061 01 02 02