Welch Allyn LC101 CO2 Module - User Manual - Manual (Page 20)

LC101 CO
2
Module OEM Implementation Manual
Page 20 Confidential Welch Allyn OEM Technologies
To get an accurate calibration, the LC101 needs to be operating for at least 5 minutes in
measurement or autorun mode with the scrubber installed. The LC101 internally monitors the
run time and will not allow a Zero Calibration if the run time requirement has not been met.
The LC101 monitors the calibration progress and provides a “Calibration OK” (or “not OK”)
message to the host system when polled for status. See the LC101 Software Protocol and the
Zero Calibration Commands and Responses for more detail. After a successful Zero Calibration,
the LC101 updates the zero residual offset constants located in the LC101 C-Cap EEPROM
Memory and the IR source current.
Zero Calibration Procedure
Equipment needed:
• watertrap
• CO
2
scrubber (or 0% CO
2
medical-grade gas source; see the Two-Point User
Calibration procedure for pressurized gas setup)
To Perform a Zero Calibration:
The user is required to apply a 0% CO
2
gas, or “zero” gas, during the steps of a Zero Calibration.
To perform Zero Calibration, the user must follow the Original Equipment Manufacturer’s
procedure typically provided in the Operator’s Guide or User Service Manual.
1. Select a well ventilated room to perform the calibration.
2. Make sure the LC101 has been operating for at least 5 minutes prior to the Zero Calibration.
3. Attach the CO
2
scrubber to the watertrap inlet according to the CO
2
scrubber “Directions for
Use” (or attach a 0% medical-grade gas source). Now let the LC101 operate for one
minute.
4. After approximately one minute, observe the CO
2
reading. The CO
2
reading should be
between 0.0% - 0.3% with well-ventilated room air.
5. Proceed with the zero gas phase of the calibration as defined by the host system.
6. Disconnect the CO
2
scrubber (or gas source) from the watertrap after the zero gas calibra-
tion.