CALIBRATION INSTRUCTIONS PV 101+/PV 102+ Service Manual
4–4 BREAS MEDICAL Doc. No. 003259 En Issue: X-1
4.5 Calibrating the flow sensor
Always calibrate the pressure sensor before you calibrate the flow sensor.
Calibrating the flow sensor first may lead to unreliable results.
1 Start the PV 101+/PV 102+ device by pressing the I/O button.
2 Plug the patient air outlet with a
6 mm flow restrictor nipple.
3 Set both the IPAP and EPAP
pressure to 12 mbar.
4 Remove the casing (see sec-
tion 3.2). Keep the CPU board
connected to the MDA board.
5 Use the voltmeter to measure the voltage on pin 8 on the analogue/digital output
connector on the rear panel of the PV 101+/PV 102+.
6 Adjust the screw on the P201 (Gain) potentiometer on the MDA board until the
voltage is 2.15 V (±0.15 V).
7 Block the air outlet to completely stop the air flow.
8 Adjust the screw on the P202 (Offset) potentiometer on the MDA board until the
voltage is 0.5 V (±0.05 V).
9 Remove the air flow blockage.
10 Repeat step 6 to 9 until no further adjustment is necessary.
11 Remove the equipment and reassemble the casing.
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