The document details the technical specifications for the ET7 end-tidal CO2 monitoring system from Meditech, highlighting its low cost and efficiency in measuring CO2 levels. It features non-dispersive infrared sampling, quick initialization, a broad measurement range, and minimal calibration needs, making it user-friendly for medical applications. Additional information includes the module’s environmental tolerance, electrical requirements, and physical characteristics for system integration.

1. CAPNOGRAPHY
Simple connection sample lines allows the ET7 to be one of the industries lowest cost per patient End-tidal CO2 systems.
Meditech Equipment Co., Ltd
Nanjing Road No.100, Qingdao, Shandong Province, P. R. China
Fax: 86-532-81705332
Tel: 86-532-85832673 81705331
sales@meditech.cn

2. Technical Specification
Carbon Dioxide Monitoring
Mode of Sampling
Principle of Operation:
Sidestream
Non-dispersive infrared (NDIR) single
beam optics, dual wavelength, no
moving parts
Initialization Time: Capnogram displayed in less than
4 seconds, At an ambient
temperature of 25° C, full specifications
within 2 minutes
CO2 Measurement
Range:
0 to 152 mmHg, 0 to 20.0% 0 to
20 kPa (Barometric Pressure
supplied by module and mmHg reading
is auto-calculated )
CO2 Calculation Method: BTPS (Body Temperature Pressure
Saturated)
CO2 Response Time: <4 seconds - includes transport time
and rise time
CO2 Resolution: 0.1 mmHg 0 to 69 mmHg 0.25 mmHg 70
to 152 mmHgCO2 Accuracy: 0 - 40 mmHg ± 2 mmHg
41 - 150 mmHg ± 8% of reading
Above 80 breath per minute ± 10% of
reading
* NOTE: Gas temperature at 25° C.
CO2 Stability: Short /long Term Drift: Drift shall not
exceed 1 mmHg
maximum. Module will auto run zero
calibration when drift exceed 1 mmHg.
CO2 Noise: RMS noise of the module shall be less
than or equal to 0.25
mmHg at 5% CO2Sampling Rate: 100 Hz
Respiration Rate Range: 2 to 150 breaths per minute (BPM)
Respiration Rate
Accuracy:
± 1 breath
Calibration ETCO2
Calculation Method:
No routine user calibration required.
Peak of the expired CO2 waveform
Inspired CO2
Measurement:
Range: 3 to 50 mmHg
Method: lowest reading of the CO2
waveform in the previous breath
Compensations: need compensations for:
Expired O2, Balance gas (N2, N2O,
He) and Anesthetic Agents
Compensations for barometric pressure
has been finished by module itself.
Environmental:
Temperature and
Humidity:
Operating: 0 to 50°C, 10 to 90% RH,
non-condensing
Storage: -40 to 60°C, 10 to 90% RH,
non-condensing
Atmospheric
Pressure:
Storage: 400-800 mmHg
Host System to ensure that the power
supply conforms to applicable
standards - Recommend IEC 60601-1
Type BF.
Mode of operation: Model MD ET7 CO2 module is rated for
continuous use.
No marking is required.
Category AP/APG: AP - This device is not suitable for use
in the presence
of a flammable anesthetic mixture with
air or nitrous oxide
Water Resistance: IPX4 - Splash-proof - Module only
(When gas dryer
line is inserted into the gas-in
receptacle)
Shock Impact: IEC TR 60721-4-7 Class 7M3 (designed
to withstand
environments subject to significant
vibrations or high shock levels)
EN60068-2-27 Shock
EN60068-2-64 Random Vibration
Radiated
emissions:
Host system dependent, designed to
meet the
requirements of EN55011
- CISPR 11 Class B 30 MHz to 1000 MHz
Electrostatic
discharge
Immunity:
Host system dependent, designed to
meet the
requirements of IEC 61000-4-2 (2001-
04) 6 kV
conducted 8 kV air discharge
Radiated
immunity:
Host system dependent, designed to
meet the
requirements of IEC 61000-4-3 (2002-
03)
80 MHz to 2.5 GHz, 20 V/m
Immunity to
conducted
Disturbances induced
by RF fields:
Host system dependent, designed to
meet the
requirements of
IEC 61000-4-6 (2001-04)
Accessories
 Sampling Line
 Gas Dryer
 Nasal Tube
 Airway Adapter
Protection
against electric
shock:
The module does not provide electrical
isolation for enclosure leakage current, patient
risk circuit, or patient auxiliary current.
Physical Characteristics and Host Interface:
Physical:
characteristics:
Module weight is less than 186g Module
Size: <76mm(wide)
*38mm(high)* 108mm(deep)
Cable length – 48.88 cm (unless otherwise
specified)
Data Interface: RS-232, bi-directional, 19200 baud,
standard N-8-1
Module
Interconnection:
Standard- Lemo Redel 8-pin plastic,
Material PSU
Module Plug: PAB.M0.8GL.AC39GZ Bend Relief:
GMA.1B.030.DA
Host Receptacle: PKB.M0.8GL.LA
Custom configurations available upon request.
Pinout:
1. VA 5.0V
2. SHIELD Shield return
3. DGND Digital return
4. VSRC 5.0V
5. TxD Serial data from MD ET7
6. RxD Serial data from Host
7. AGND Analog return
8. NC
Model MD ET7
CO2
module Voltage
requirements:
The MD ET7 Module relies solely on the
host system for power.
The host system shall provide the following:
VA:+5.00 VDC 5.0%;
70 mA (350 mW)typ (Steady-state); 240 mA
(1.2 W) max
(Offset calibration ). Ripple not to exceed 50.0
mV VSRC: DC Output Voltage:+5 V
Output Current: 40 mA .
Power interface must conform to IEC 60601-1
Power Rating: Total System Power: Offset calibration:<1.1W
Steady-state < 0.5 W