Hoffrichter CARAT I, Service Manual

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1.5. The value shown on the meter is set to the calibration value by turning the MFK and accepted
by pressing the esc | mode button.
1.6. The value must be set to an accuracy of ± 0.05 hPa.
1.7. Abortion is by pressing the MFK for a period of more than 3 seconds.
1.8. After the calibration, press the MFK momentarily to return to the standard screen.
Figure 6: Measurement setup pressure sensor calibration CARAT I and CARAT II
2. Flow Sensor Calibration
2.1. For the CARAT I, attach the respiration tube, with pressure metering tube, to the inspiration
connection and connect the pressure metering tube. The measurement of the flow is taken at
the open side of the tube.
2.2. For the CARAT II, attach the flow meter to the inspiration connection or expiration connection.
The open connection of the flow meter must be connected to the open section of the CARAT II
by the respiration tube with pressure metering tube. Thereby, the metering tube must be con-
nected with the pressure metering connection of the device.
2.3. In the Service display, make the selection menu item “Flow Sensor Calibration”, enter the
appropriate PIn and confirm.
2.4. The calibration is carried out at 0, 10, 20, 40, 60, 80, 100, 120 and 160 l/min.
2.5. The measured value shown on the flow meter is to be set to the calibration value by turning the
MFK and accepted by pressing the esc | mode button.
2.6. The value must be set to an accuracy of ± 1.5 %.
2.7. To abort the calibration, press the MFK for a period of more than 3 seconds.
2.8. After the calibration, press the MFK momentarily to return to the standard screen.