Welch Allyn Duet CO2 Module - User Manual - Manual (Page 55)

Duet CO
2
Module OEM Implementation Manual
Welch Allyn OEM Technologies Confidential Page 55
Sidestream CO
2
Verification
Typically, calibrated gas measurement is a steady state measurement, so updated breath data is not
necessary. Also, calibrated gasses are dry gas, therefore the water vapor and BTPS compensations
should be disabled by the Host in those instances where dry gas readings are made.
Equipment needed
§ CO
2
Verification Kit (Contact Welch Allyn OEM Technologies for availability)
§ calibration gas canister / 10.00% CO
2
, balance nitrogen, ±0.02%
Illustration of gas canister,
regulator and pneumatic circuit
10%
CO2
Bal. N2
Regulator
On/Off
Tee
Free Flow Away
From Monitor Input
To Monitor
Water Trap
To check the sidestream sensor
• Locate the monitor or Duet module in a well ventilated room.
• Set up a pneumatic circuit, or Welch Allyn CO
2
Verification Kit as illustrated.
• Turn the monitor or Duet module ON and enter the sidestream mode.
• Disable the Water Vapor and BTPS Compensations, and the Breath Data Packets.
• Run the Duet sidestream system for a minimum of 15 minutes.
• At the end of the 15 minute period, verify that the displayed CO
2
reading is between 0 mmHg
and 2 mmHg.
• Connect the Duet sidestream inlet line to the delivery line tee.
• Connect the calibration gas and apply the gas. The gas flow rate should be set to
approximately 250ml/min.
• Allow the sample gas to flow for approximately 30 seconds.
• Verify that the accuracy of the CO
2
reading is within the manufacturer’s specification for the
calibration gas used.