Text Box: OFS1 
 Any Oxygen & Flow Rate Sensor 
 Oxygen (1.5%)
Flow rate 0-20 L/min (0.1 L/min)
4ms response
USART, LCD & Analog outputs 
Operating temperature range 45 to +70C




Ultra fast and miniature - Oxygen and Volumetric Flow rate sensor. OFS1 is powered by 8V to 35V / 14mA unregulated DC Power Supply. OFS1 provides: 0-5V DC proportional outputs; UART bit stream comprising: O2 concentration, Volumetric Flow Rate, temperature and operational hours. 4ms response is ideally suited for crisp flow rate measurement & closed loop control. Time constant, bi-directionally stable response enables detection of Start of Breath and calculation of spirometry parameters. Thermal characteristics allow automotive, high altitude and other Oxygen Measurement applications. Flow direction Alarm output can detect wrong direction of Flow. .



Text Box: info@dgflo.com


4.6 x 0.8 x 0.5 / 25g

Oxygen types

Controlled by J1.4 O2 concentrator or air mixtures with pure O2


UART, LCD, Analog

Analog Flow output

0 to 5V DC Linearly proportional to 020 L/min

Analog O2 output

0 to 5V DC Linearly proportional to 0100% O2

Power Supply

Unregulated 8V to 32V DC / 14 mA

Display Switch

Performs Field Calibrations & Toggles between O2 & Flow on DigiDISP

O2 Accuracy

1.5% @ 5 to +45C; 2% @ -45C to 5C, 45C to +70C

Flow Resolution

0.1 L/min

O2 Range

20.8% - 95.7%, 20.8% - 100%

Max pressure

30 psig

Thermal change response

1 oC/min

Thermal Gradientmax

50 K/m

Operating Temperature

-45 to 70C

Survival Temperature

-85 to +85C

RS232 transmit Rate

200 bytes/sec @ 19200 bits/sec

Calibration Retention

More than 10 years


Factory. Optional field calibration is provided.

Flow I/O

Bi-directional via 1/8 male barbs

Response Time

4 ms

USART Frame content

O2 [%], Flow Rate[L/min], Temperature[C], Hours of operation

10Hz Square wave output

J1.6 5V P-P

Flow Direction Indicator

J1.3Open Drain


to other units of Flow

How to convert Volumetric Flow to other units of Flow Rate,

such as gal/min, SLPM