Welch Allyn LC101 CO2 Module - User Manual - Manual (Page 23)

LC101 CO
2
Module OEM Implementation Manual Section 3 - LC101 Calibration
Welch Allyn OEM Technologies Confidential Page 23
To Perform a Two-Point User Calibration:
The user is required to apply a 0% CO
2
, or “zero” gas, and also apply a gas of known CO
2
concentration (referred to as “span” gas) during the various steps of a Two-Point User
Calibration. The user is required to manually enter the value of the Span Gas applied into the
Monitor.
To perform the Two-Point User Calibration, the user must follow the Original Equipment
Manufacturer’s procedure typically provided in the Operator’s Guide or User Service Manual.
(Refer to illustration on page 22.)
1. Select a well-ventilated room to perform the calibration.
2. Let the LC101 run for at least 5 minutes prior to calibration.
3. For the “Sample Zero Reference Gas” step, attach the CO
2
scrubber to the watertrap inlet
according to the CO
2
scrubber “Directions for Use” (or use a 0% medical-grade gas source).
4. Proceed with the zero gas phase of the calibration as defined by the host system. Discon-
nect CO
2
scrubber (or 0% gas source) from the watertrap after the zero gas phase and prior
to the next calibration step.
5. For the “Sample Span Reference Gas” phase of the calibration, provide a medical-grade
gas source with a known CO
2
concentration between 8% and 12%, regulated to a pressure
between 5 and 7 psi.
NOTE Do not apply any pressure directly to the Module inlet or outlet.
6. Introduce a steady stream of CO
2
gas. Set and monitor the flow rate to approximately
1 liter/minute (±10%). To verify flow, place the bleed line of the calibration sample line in a
glass of water. If bubbles emerge, gas supply is sufficient. If no bubbles emerge, there is an
insufficient supply of gas.
7. Connect a sample line from the sample elbow, or Tee, as shown above, to the Monitor’s
watertrap inlet. Make sure the bleed line is directed away from the monitor. Allow the refer-
ence gas to flow for at least one minute.
8. Sample the Span Reference Gas.
9. After the Two-Point User Calibration steps have been followed, disconnect the LC101 from
the gas supply and test setup.
10. A verification may be performed using the same gas delivery set up. Verify the observed
CO
2
gas reading is within 3 mmHg or 10%, whichever is greater, of the CO
2
value of the test
gas supplied. (If not, refer the user to the appropriate troubleshooting information.)