China Medical air flow sensor for ventilators and CPAP machine

Description

GFS131 flow sensor uses the thermodynamic principle to detect flow rate of the gas medium in the flow channel, with good precision and repeatability. Temperature sensors are built-in and every one product is calibrated for temperature compensation. At the same time, it has linear analog voltage output, convenient to use.

Detail show

Main Applications :Intensive care ventilator / Portable ventilator

Features

1.Latest MEMS Sensor chip technology

2.High accuracy, quick response, good repeatability

3.Detection micro flow accurately

4.It is calibrated completely and temperature compensated

Specification ModelGFS131Measuring Range100, 150, 200, 300SLM MinTypicalMaxUnitFull Scale Output4.344.504.66VZero Output0.450.50.55VOutput Impedance-1000-ΩWorking Voltage4.955.014.0VWorking Current-25-mAAccuracy-±2.5±4%F.SRepeatability-±0.5±1%F.SOutput Drift-0.12-%/℃Signal noise-10-mV(Vrms)Resistance-120-Pa/60SLMPower consumption-125-mW/5VWorking pressure--100kPaResponse Time-50-msWorking Temp-25 65℃Storage Temp.-40 90℃

Note:

1.The measuring range within 20-300SLM.

2.SLM means standard liter per minute. Standard-state: gas temperature is 0℃ and pressure is 101.325 kPa. The testing environment is room temperature and clear air.

3.The response time could be customized for 15-1000ms.

4.The temperature compensation is for the tem. range of 0-50℃ and the compensation performance can’t be ensured beyond the temperature range.

Pins Definition

Calculation for Airflow

Actual flow=full scale * (sensor actual output voltage-zero output voltage) / (full scale output voltage-zero output voltage) For example: the sensor full scale is 200 SLM, the sensor zero output voltage is 0.5V and full scale output voltage is 4.5V, and the actual output is 3.5V. Then the actual flow=200 SLM * (3.5V – 0.5V)/(4.5V- 0.5V) = 150SLM

Cautions

1. The air inlet and air outlet of the sensor need to be equipped with long straight pipe to ensure the product’s performance. It is recommended to leave a straight pipe for the inlet with 10 times longer than the pipe diameter while the outlet will be 5 times longer.

2. If measured gas medium contains dirt, the sensor’s lifespan will be shortened. We suggest users equip the sensor flow inlet with 5 micrometer precise filter.

3. The sensitivity of the product will reduce or be damaged if it contacts to water.

4. The wrong connecting of power supply will damage the internal circuit.

Company information

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