Stryker PneumoSure, Service Manual, Page: 20 / 76

18
EN
Maintenance and Service Tasks
4.8 Testing the Low Pressure Unit LPU for Leaks
1. Switch device off.
2. Attach the calibration adapter
(5)
to the device as described in chapter 4.7
Mounting the Calibration Adapter and turn the 3-port valve
(5)
to the depict-
ed position.
3. Connect a manometer
(3)
and an air-filled syringe
(1)
to the calibration
adapter
(6)
.
4. Use the syringe to generate a pressure of 50 mm Hg.
5. Clamp off tube
(2)
at 50 mm Hg using a tube clamp. It is also possible to turn
the 3-port valve to the right by 90° instead.
The pressure at the manometer should not have dropped more 2 mm Hg within
30 seconds.
Corrective measure • Check the calibration adapter for leaks by clamping off the tube leading to the
tube connection at the LPU
(7)
using a tube clamp and carrying out a leak test
once more. If another leak is detected, check the correct fit of the connection
adapter seal and check all tube connections of the adapter including those of
the 3-port valve. Replace the LPU if the calibration adapter does not have any
leaks. Then repeat the leak test.
• Check the tube at the fluid sensor
(6)
and the low pressure unit LPU
(7)
and
replace if necessary (see Fig. 4-11 Position of fluid sensor / low pressure tube
LPT).
• Replacing the LPU.
Fig. 4-10 Testing the low pressure unit
LPU for leaks
(1)
Syringe
(2)
Tube clamp
(3)
Manometer 0-100 mm Hg
(4)
Tube, small diameter
(5)
Three-port valve
(6)
Calibration adapter
mm Hg
(1) (2) (3) (6) (5) (4)