GE B20 User Manual page 69

Calibrating
Calibrating airway gases
Follow the recommended calibration intervals (every six months in
normal use and every two months in continuous use) to ensure that
the measurement accuracy remains within specifications.
Required tools
PN Description
755534-HEL Calibration Gas Regulator
M1006864 Calibration Gas Regulator (US only)
- 3 m/10 ft anesthesia gas sampling line
755583-HEL Calibration gas, CO2, O2, N2O, DESF, package of 1
can (with E-sCAiO or N-CAiO module)
755581-HEL QUICK CAL calibration gas, CO2, O2, N2O, package
of 4 cans (with E-sCO module)
755571-HEL Calibration Gas, 5% CO2, 54.5% O2, 36.0% N2O,
2.0% DESFLURANE, BAL N2 (with E-sCAiO or N-
CAiO module, US only)
755587 Calibration Gas, CO2, O2, Balance, 4 cans/pkg
(with E-sCO module, US only)
NOTE: Use only GE approved calibration gas for the gas calibration
to ensure measurement accuracy. Do not use any other calibration
gases. Check the calibration gas container's labelling to ensure that
the calibration gas has not expired.
NOTE: Ensure that the gas regulator is functioning properly before
gas calibration. Refer to the gas regulator's "Instructions for Use" for
the annual maintenance instructions.
Before calibration
1. Ensure that the module is connected to the monitor. Ensure that
you have an appropriate water trap in use.
2. Turn on the monitor. Let the monitor warm up for 30 minutes.
3. Attach a regulator to the calibration gas container.
4. Connect a new gas sampling line to the sampling line connector
in the water trap.
5. Connect the other end of the gas sampling line to the regulator
on the gas container. Leave the regulator overflow port open to
room air.
NOTE: Gas calibration is not possible if the following messages are
displayed: 'Sample line blocked', 'Check D-Fend' and/or 'Check sample
gas out'. Resolve the alarm condition before starting calibration.
Starting calibration
1. On the monitor, select
2. The monitor will start automatic zeroing the gas sensors. Wait
until the message 'Zeroing' is replaced by the message 'Zero OK'
for all measured gases.
3. Open the regulator after the message 'Feed gas' displays for all
measured gases. The measured gas concentrations are shown
in real-time in the gas calibration menu. Continue feeding the
calibration gas until the measured gas concentrations are
stabilized and the message 'Adjust' displays for all measured
gases.
4. Close the regulator.
5. Use the Trim Knob to adjust the gas readings displayed to match
with the gas readings in the labelling of the calibration gas
container. Press the Trim Knob to accept the adjusted values
when the gas readings match.
6. Wait until the message 'OK' displays for all measured gases.
65
Airway Gas
> Gas Calibration