Philips 862474 ユーザーズマニュアル
Performance Procedures
4-34
Testing the Monitor
CO
2
Gas
Measurement
Calibration
Check
After switching the monitor on, or after turning on the etCO
2
On/Off setting in the etCO
2
frame, wait at least 20 minutes before checking the calibration.
Step
Action
1
Check that the 5% calibration gas and flow regulator are connected.
2
Calculate the expected measurement value in mmHg as follows:
0.05 x (ambient pressure) / 1.03 = value mmHg
i.e. 0.05 x 736 mmHg / 1.03 = 35.7 mmHg (with an ambient pressure of 736
mmHg)
mmHg)
Note: Dividing by 1.03 compensates for the dry calibration gas at room
temperature, relative to breath gases containing water vapor and at body
temperature.
temperature, relative to breath gases containing water vapor and at body
temperature.
3
Select CO
2
Calibration. Wait for the status message "CO
2
module reset in
progress" to disappear. Open the valve on the flow regulator to allow 5% CO
2
gas to flow into the monitor. Allow the displayed CO
2
value (third row of CO
2
Test menu) to stabilize.
4
Check that the CO
2
value on the monitor matches the calculated mmHg value
±2.6 mmHg. If the value is outside the tolerance, calibrate as described in Step 9
to 13.
to 13.
5
Disconnect the 5% calibration gas and connect the 10% calibration gas.
6
Calculate the expected measurement value and tolerance in mmHg as follows:
0.1 x (ambient pressure) / 1.03 = value mmHg
±0.07 x (value mmHg) = tolerance
i.e. 0.1 x 737 mmHg / 1.03 = 71.6 mmHg (with an ambient pressure of 737
mmHg)
mmHg)
±0.07 x 71.6 mmHg = ±5.01 mmHg tolerance
7
Open the valve on the flow regulator to allow 10% CO
2
gas to flow into the
monitor. Allow the value to stabilize.
8
Check that the value on the monitor (X6) matches the calculated mmHg value
within the calculated tolerance. If so, the CO
within the calculated tolerance. If so, the CO
2
module is correctly calibrated. If
the value is outside the tolerance, calibrate as follows.
9
If not already connected, connect the 5% calibration gas.
10
Select CO
2
Calibration to enter the Calibration sub-menu. Wait for the status
message "CO
2
module reset in progress" to disappear.
11
Select the value for the calibration gas (The default value is 5%).
12
Select Start Calibration and open the valve on the calibration gas to allow CO
2
gas to flow into the monitor. Allow the value to stabilize before the start of the
calibration. Leave the valve open until the monitor gives a prompt that the gas
can be removed.
calibration. Leave the valve open until the monitor gives a prompt that the gas
can be removed.
13
The CO
2
module calibrates and prompts when calibration is successful.