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Mainstream EtCO2 Sensor  
Meditech Mainstream CO2 Sensor MD ET3 is designed for mainstream measurements using sophisticated infrared absorption spectroscopy to measure ETCO2 with mainstream,


Transducer Type

Mainstream CO2 Sensor

 Principle of Operation

Infrared Spectroscopy

Energy Emitting Device

Proprietary High Efficiency IR Source

Energy Detecting Device

Frequency Stable Thermopile

CO2 Measurement Range

0% to 20%

CO2 Resolution

0.1 mm Hg 0 to 49 mm Hg

0.2 mm Hg 50 to 150 mm Hg

CO2 Accuracy

 ±2 mm Hg  @ < 5.0% CO2 (at BTPS)
< 10% of reading @ > 5.0%CO2(at BTPS)




 < 40g

Breath  Rate Range

2 to 150 Breaths Per Minute (BPM)

Respiratory Rate Accuracy

±1 breath


No routine user calibration required, but module can be calibrated by user

Data Interface

Highly configurable serial digital interface (TTL/RS232 Level)

Data Output


CO2 gas concentration (mm Hg), End-tidal CO2, Inspired CO2, Respiratory Rate.

Input Voltage 

5.0 VDC ±5%

Power Consumption


Warm-up Time

 10 seconds

Response Time

 Detector: 20mSec (Typical)


 System: 200mSec(Typical)

Operating Temperature

5 to 50

Temperature Range

 -40 to 70



Standard Lemo Redel 8-pin plastic 
Material PSU 
Sensor Plug: PAB.M0.8GL.AC39GZ 
Band Relief: GMA.1B.030.DJ 
Host Receptacle: PKB.M0.8GL.LJ


Pin out:

1 VA 5.0V 
2 Shield Shield 
3 DGND Digital return 
4 VA 5.0V 
5 TxD Serial data from the Module
6 RxD Serial data from Host 
7 AGND Analog return 
8 NC

Shock Impact


IEC TR 6 0721-4-7 Class 7M3 (designed to withstand environments subject to significant vibrations or high shock levels)

EN6 0068-2-27 Shock

EN60068-2-64 Random vibration



Designed to meet IEC 6 0601-1-2 , EN55011 .CISPIR 11 Class B (Radiated and Conductive Emissions), IEC 6 1000-4-2 Electrostatic Discharge Immunity, IEC 6 1000-4-3 Radiated Immunity,

Designed to comply with 93/42/EEC (MDD CE Marking), FDA Standards, Minimum Performance and Safety Requirements for Comptometers and ISO21647.

Medical Electrical Equipment performance requirements for the basic safety and essential performance of respiratory gas monitors.

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