Ultrasonic oxygen concentration sensor module solution based on ST STM32F030K6T6

1. Ultrasonic Oxygen and Flow Sensors for Medical Devices

Since 2020, due to the outbreak of the novel coronavirus, the global demand for medical ventilators and oxygen concentrators has been increasing day by day. Among them, the oxygen concentration and flow sensors used in medical ventilators and oxygen concentrators have become important players in the new crown epidemic, and the demand is also growing explosively.

It is well known that patients need oxygen during treatment. "Oxygen" in general hospitals is a mixture of pure medical-grade oxygen and air humidification and filtration. The doctor will measure and monitor the patient's inhaled and exhaled oxygen concentration, flow, pressure, flow rate, etc. in real time according to the specific treatment needs. In special cases, patients need 100% pure oxygen. Therefore, oxygen concentration and flow measurement play an important role in different medical devices and therapeutic instruments.

2. Technical principle of ultrasonic time difference method

The ultrasonic time difference method uses a pair of ultrasonic transducers to send and receive ultrasonic waves alternately (or at the same time), and indirectly measures the flow velocity of the fluid by observing the forward and backward propagation time difference of the ultrasonic waves in the medium (gas or liquid), and then through the flow velocity.

An indirect method of calculating flow. Flow measurement on the ultrasonic principle only depends on flow and geometry, not on temperature, gas composition, humidity or pressure.

►Scene Application Diagram

►Product physical map

►Display board photos

►Scheme block diagram

►Core technical advantages

1. Using the main control chip of STM32F030K6T6, the price and performance complement each other, and the SDK driver provided by ST can be quickly developed;

2. LDO ME6203 is a localized low-cost LDO;

3. Simultaneously measure oxygen concentration and flow full-scale temperature compensation to meet CMC, CE, EMC, ROHS certification requires small size and more flexible application;

►Program Specifications

Detection principle: Ultrasonic measurement principle

Detection range: O2 concentration: 0~100% (PSA oxygen generator O2 concentration: 20.5%~95.6%)

O2 flow rate: 0~10L/min

Detection accuracy: O2 concentration: ±1.5%FS@( 5~45)℃

O2 flow rate: ±0.2L/min@(5~45)℃

Resolution: O2 concentration: 0.1%

O2 flow rate: 0.1L/min

Response time Concentration: ≤1.5s; Flow rate: ≤0.3s

Working conditions : -5°C~50°C, below 0~95%RH (non-condensing)

Storage condition: -20°C~60°C, 0~95%RH (non-condensing)

Operating voltage: DC 4.75V~12.6V Wave <50mA

Working current: Average working current <35mA

Signal output: UART_TTL(3.3V)

Product size: W80*H22*D25(mm)