Ultrasonic

OCS-3FS-1.2SUltrasonic Oxygen Sensor

Name: OCS-3FS-1.2S Ultrasonic Oxygen Sensor
Brand: Winpower
SKU: OCS-3FS-1.2S

PSA Oxygen Concentrator (Portable)

US-patented ultrasonic oxygen sensor with human respiratory microflow detection for portable oxygen concentrators. Measures O₂ concentration (21–95.6%) and breathing flow (0–15 L/min) with ±2%FS accuracy; integrates concentration, flow and breath detection with air supply control via UART.

Microflow detection US Patent Compact form factor 5-year calibration-free Digital output

Download Datasheet Request UART Protocol

Product Introduction

The OCS-3FS-1.2S ultrasonic oxygen sensor is a new type of gas sensor developed by Winpower Technology Co., Ltd. It uses the ultrasonic principle to detect the oxygen concentration, flow rate, single supply volume of gas, and human breathing. The sensor supports concentration, flow rate and breathing detection, and integrates various working mode related air supply control. It is suitable for oxygen generator manufacturers for the rapid development of portable oxygen generators, and can also be used for the renovation and upgrade of traditional oxygen generators to reduce machine size, increase equivalent oxygen flow, and save energy.

Features

High accuracy — ±2%FS concentration accuracy with 0–15 L/min flow sensing
Fast communication — 115200bps UART with 500ms data report or instant response to query commands
Multi-mode air supply control — supports off, pulse, direct supply, and fixed pulse modes
Integrated breathing detection — respiratory sensitivity adjustable from 2–12 mL/min
Gas supply gear adjustable — 1–20 adjustable gears for flexible oxygen delivery
Long-term stability — no need for regular calibration, 5+ year service life
Lightweight — approximately 17g for portable device integration

Applications

Portable molecular sieve oxygen generators

Non-portable molecular sieve oxygen generators

Traditional oxygen generator renovation and upgrade

Portable oxygen concentrator development

Pulse-dose oxygen delivery systems

Precautions for Use

Ensure that the detected gas is free of water, oil, and dust before it reaches the sensor.
Without the permission of the manufacturer, do not disassemble the sensor; any damage caused thereby will not be covered by warranty or repair.
This sensor and data manual may be changed due to product technical improvements without prior notice.
Oxygen supply time less than 0.1 seconds may affect the oxygen concentration reading.
If no breathing is detected for 30 seconds in pulse mode, the sensor will automatically enter fixed pulse mode to avoid machine failure.

Technical Specifications

Range of Concentration	21% – 95.6%
Resolution	0.1%
Accuracy	±2%FS @ (5 – 55)°C (due to deviation in breathing rhythm)
Range of Flow	0 – 15 L/min
Flow Resolution	0.1 L/min
Flow Accuracy	±0.2 L/min or 5% of reading
UART Data Report	500ms or respond immediately after received instruction
Digital Output	115200bps UART, 3.3V TTL level
Working Temperature	5 – 55°C
Storage Temperature	-5 – 65°C
Working Humidity	≤85%RH
Withstand Pressure	0 – 150kPa (pipeline pressure will affect flow accuracy)
Power Supply	DC 8 – 15V ±0.5V (depending on solenoid valve requirements)
Respiratory Sensitivity	2 – 12 mL/min adjustable (smaller value = higher sensitivity)
Gas Supply Gear	1 – 20 adjustable gears
Dimensions	50mm × 38mm × 25mm (L × W × H)
Weight	About 17g

Connectors

Connector Overview

Connector	Name / Function	Description
J1	4-Pin 2.0mm Power Supply and Digital Signal Output	Combined power input and UART digital signal output for concentration, flow, temperature, breathing, and gear data
J4	2-Pin 2.0mm Pulse Electromagnetic Valve	Drives the two-way three-way valve pulse solenoid valve for pulse gas supply
J5	2-Pin 2.0mm Direct Supply Air Solenoid Valve	Drives the direct supply air solenoid valve for continuous gas supply

Table 1: Power Supply and Digital Signal Output J1

Pin	Function
Pin 1	DC 8 – 15V power input
Pin 2	RXD
Pin 3	TXD
Pin 4	GND

Table 2: Pulse Electromagnetic Valve J4

Pin	Function
Pin 1	Valve+ — two-way three-way valve positive terminal
Pin 2	Valve- — two-way three-way valve negative terminal

Table 3: Direct Supply Air Solenoid Valve J5

Pin	Function
Pin 1	Valve+ — direct supply solenoid valve positive terminal
Pin 2	Valve- — direct supply solenoid valve negative terminal

Dimensions

Dimensions: 50mm × 38mm × 25mm (L × W × H). J4 and J5 are 2P × 2.0mm; J1 is 4P × 2.0mm. Unit: mm, Tolerance: ±0.2mm.

Packaging

Inner Box

Capacity: 30PCS / layer × 4 layers = 120PCS
Dimensions: 42 × 30 × 24cm

Shipping Carton

Dimensions: 50 × 32 × 44cm
Contains: 2 inner boxes (120 × 2 = 240PCS)
Net weight: 5KG
Gross weight: 7.2KG

UART Communication Protocol

The UART communication protocol and integration guide for OCS-3FS-1.2S is available upon request. Please contact our engineering team for the complete technical documentation.

For inquiries: Request Quote | Technical Support