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5-4

5.1.8 CO2

1. Test fixture

CO2 steel bottle (containing 10% CO2)

2. Test procedure

①Sidestream CO2 measurement: Set the calculation compensation of DPM4 to COMMON.

Plug the water trap to the water trap socket, connect the sampling tube with the CO2 steel

bottle, and open//close the valve of the CO2 steel bottle based on the interval of 3s. The

CO2 value should be the calibration gas pressure value: 76±5%mmHg. When the valve is

opened permanently, the patient monitor prompts “APNEA ALARM”.

Unplug the water trap. The patient monitor prompts “CO2 water trap OFF”. Plug the water

trap again. The prompting message disappears.

②When the measured value exceeds the high limit of CO2, the patient monitor prompts “CO2

too high” on the main screen. When the measured value is lower than the low limit, the

patient monitor prompts “CO2 too low”.

5.1.9 Watertrap

1. Connect the airway and block the inlet of the sampling line with your finger. Check if the

message CO2 SAMPLE LINE ABNORMAL is displayed and the current pump rate in the

CO2 USER MAINTAIN menu drops below ５ml/min. If yes, it indicates the airway is

normal. Otherwise, proceed with step 2.

2. Remove the sampling line and block the inlet of the watertrap with your finger. Check if the

message CO2 SAMPLE LINE ABNORMAL is displayed and the current pump rate in the

CO2 USER MAINTAIN menu drops below ５ml/min. If yes, it indicates there may be a

problem with the connection between the sampling line and watertrap or a leakage in the

sampling line. Otherwise, proceed with step 3.

3. Remove the watertrap and block the two inlets in the receptacle for the watertrap. Check if

the message CO2 SAMPLE LINE ABNORMAL is displayed and the current pump rate in

the CO2 USER MAINTAIN menu drops below ５ml/min. If yes, it indicates there may be

a problem with the connection between the watertrap and its receptacle or a leakage in the

watertrap. Otherwise, there may be a problem with the internal airway in the monitor. The

internal airway has two parts, one part in the receptacle and the other part in the module.

Block the small tubes between the watertrap receptacle and module with your fingers and

check if the message CO2 SAMPLE LINE ABNORMAL is displayed and the current pump

rate in the CO2 USER MAINTAIN menu drops below ５ml/min. If yes, it indicates there is

a problem with the airway in the receptacle. Replace the receptacle. Otherwise, replace the

module.

Mindray DPM 4 Service Manual

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