Welch Allyn PROPAQ CS - Manual (Page 41)

Service Manual Functional verification 37
11. Plug the water trap inlet and verify that the monitor generates an OCCLUSION-
CHECK WATER TRAP/TUBING equipment alert message. Acknowledge the
equipment alert. Wait for SRCH to appear in the SCO
2
numerics window.
12. Plug the exhaust port and verify that the monitor generates an OCCLUSION-CHECK
EXHAUST PORT/TUBING equipment alert message. Acknowledge the equipment
alert.
13. Through the CO2/SPO2 > CO2 > MORE menu, push SOURCE to turn off CO2/BR
monitoring. Confirm the message.
14. Connect the test tubing setup as shown above to the water trap inlet and to the
exhaust port.
15. Use the pump bulb to manually inflate the pressure to 100 mmHg.
16. Wait 15 seconds for the pressure to stabilize. Note the pressure reading, then wait an
additional 60 seconds and record the leak rate. This is the total leakage (including
water trap leakage from step 9).
17. Subtract the water trap leakage (determined in step 9) from the total leakage
(determined in step 16) to obtain the internal SCO
2
leak rate which should be less
than 10 mmHg. The total leakage, including water trap leakage from step 9, cannot be
more than 10 mmHg.
18. Disconnect the tubing setup from the water trap and exhaust port.
19. With water trap installed in the water trap receiver, turn on SCO
2
monitoring through
CO2/SPO2 > CO2 > MORE > SOURCE.
20. Through the CO2/SPO2 > CO2 > MORE > FLOW RATE menus, set the monitor flow
rate to 90 mL/min.
21. Wait 5 minutes.
22. Connect the flow meter to the water trap.
23. Check that the measured flow rate is between 76 and 104 mL/min.
24. Disconnect the flow meter from the tubing connected to the water trap (leave the
open length of tubing connected.)
25. Connect the flow meter in line with the CO
2
gas delivery tubing.
26. Adjust the CO
2
flow for a rate of 110-200 mL/min.
27. Insert the gas delivery tubing and the open sampling line from step 24 into a small
ziplock bag (sandwich sized) with the zip lock closed as far as possible without
pinching the tubing. This will slightly pressurize the bag with the test gas.
28. Wait two minutes for the bag to fully equalize with the test gas.
29. Calculate the partial pressure of the test gas used as instructed in “CO2 verification
preparation” on page 30.
Caution The occlusion test can stress any defective pneumatic tubing
connections and may cause leakage. Always perform the following leak test after
the occlusion test to reveal any tubing problems.
Caution Do not exceed 100 mmHg during the following pressurization.
Excessive pressure can open internal tubing connections and cause leakage.