Welch Allyn Duet CO2 Module - User Manual - Manual (Page 54)

Duet CO
2
Module OEM Implementation Manual
Page 54 Confidential Welch Allyn OEM Technologies
To check the mainstream sensor
• Locate the monitor in a well ventilated room.
• Turn the monitor ON and enter the mainstream mode.
• Disable the Water Vapor and BTPS Compensations, and the Breath Data Packets.
• Warm the mainstream sensor for a minimum of 15 minutes.
• At the end of the 15 minute warm up period, verify that the displayed CO
2
reading is between 0
mmHg and 2 mmHg.
• Connect the mainstream sensor to the airway adapter.
• Connect the calibration gas and apply the gas. The gas flow rate should be set to
approximately 250ml/min.
• Verify that the accuracy of the CO
2
reading is within the manufacturer’s specification for the
calibration gas used.
To troubleshoot error
• Check to make sure that the room is well ventilated. CO
2
readings may be elevated in a closed
room.
• Check that the calibration gas is of known concentration. Repeat the calibration check using a
different mainstream sensor. If the CO
2
readings are consistently elevated or depressed, the
calibration gas may be suspect. Access another gas source.
• Insure that the Mainstream sensor was warmed to the proper operating temperature of 42 o
C.
Repeat the warm up period of 15 minutes and calibration check.
• Check for the presence of a dirty or faulty calibrated airway adapter. Clean the airway adapter
and repeat the calibration check. If the CO
2
reading is still in error, replace the airway adapter
and repeat the calibration check. If different readings persist, a faulty airway adapter is
suspected.
• Check for air leaks in the pneumatic tubing and connections. Repair or replace as needed.