Performance Procedures

CO2 Gas After switching the monitor on, or after turning on the etCO2 On/Off setting in the etCO2 Measurement frame, wait at least 20 minutes before checking the calibration.

Calibration

Check

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)

 

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.

 

 

3

Select CO2 Calibration. Wait for the status message "CO2 module reset in

 

progress" to disappear. Open the valve on the flow regulator to allow 5% CO2

 

gas to flow into the monitor. Allow the displayed CO2 value (third row of CO2

 

Test menu) to stabilize.

4

Check that the CO2 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.

 

 

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)

 

±0.07 x 71.6 mmHg = ±5.01 mmHg tolerance

 

 

7

Open the valve on the flow regulator to allow 10% CO2 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 CO2 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 CO2 Calibration to enter the Calibration sub-menu. Wait for the status

 

message "CO2 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 CO2

 

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.

 

 

13

The CO2 module calibrates and prompts when calibration is successful.

4-34Testing the Monitor

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Philips 862478, 862474 manual Calibration Check, Temperature

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