Ultra fast and miniature - Mainstream Carbon Dioxide & Volumetric Flow rate sensor is the ideal solution for your mixed CO2 system.

CFS1 modern  DSP ultrasonic gas sensor technology measures Flow Rate & Carbon Dioxide at unprecedented 4ms response rate. It provides 0-5V, UART and LCD outputs.

Applications comprise: Capnography, tidal CO2, metabolic health, anxiety, etc.




Text Box:            CFS1 (breath or dry gas)
  Mainstream CO2 (±0.03%)
Flow rate ±0—500 L/min (±1 L/min)
4ms response
UART, 0-5V, LCD outputs 
Text Box: info@dgflo.com


 4.6 x 0.8x 0.5” / 45g


 UART, LCD, Analog

Analog Flow output

0 to 5V DC Linearly proportional to ±0—500 L/min

Analog CO2 output

0 to 5V DC Linearly proportional to 0—10% CO2

Power Supply

 Unregulated 8V to 30V DC / 14 mA

Display Switch

Toggles between CO2, Flow Rate and Pressure on DigiDISP

 CO2 Accuracy & resolution


Flow Resolution

±1 LPM

CO2 Range


Max pressure

 30 psig

Thermal Gradientmax

50 K/m

Operating Temperature


Survival Temperature


UART transmit Rate

200 bytes/sec @ 19200 bits/sec

Calibration Retention

 More than 10 years



Flow  I/O

Bi-directional via 1/2” male barbs

Response Time

 4 ms

UART Frame content

CO2 [%], Flow Rate, Temperature [°C], Minutes of operation

Flow Direction Indicator

J1.3—Open Drain

Long term display & save

Via  DigiTEST