The main purpose

LFY-711 is used to measure the inhalation resistance and exhalation resistance of respirators and mask protective equipment under specified conditions. Applicable to the national labor protection equipment inspection agencies and mask manufacturers to carry out related tests and inspections on ordinary masks, dust masks, medical masks, and anti-smog masks.

Technical index

1. The instrument consists of an air source that can adjust the flow rate, a human head model prescribed by the standard, a two-pipeline system for inhalation and exhalation, and a respiratory resistance measurement system.

2. The flow sensor has high sensitivity and a very small starting flow.

3. The flow sensor chip adopts thermal mass flowmeter, without temperature and pressure compensation, which ensures the high-precision measurement of the sensor. The range of the flowmeter is 0 L/min～100L/min, and the accuracy is ±2%.

4. Multiple sensors are integrated on a single flow sensor chip, which greatly improves the range ratio of the sensor.

5. The flow sensor has high zero point stability, full range high stability, full range high accuracy and excellent repeatability, low power consumption, low pressure loss and fast response.

6. The data recorder adopts a graphic dot matrix LCD with a resolution of 128×64 and a full Chinese interface, which is easy to operate.

7. There is 4M memory in the data logger for measurement value recording.

8. The micromanometer sensor adopts a two-wire system with high accuracy and good stability; it is safe and reliable in use with an explosion-proof design.

9. The range and zero point of the micromanometer sensor are continuously adjustable externally, the damping is adjustable, there is no mechanical movable part, and the maintenance workload is small. The micro-pressure metering range is -1000Pa～1000Pa, and the accuracy is 1Pa.

10. The whole instrument adopts special air circuit conversion components, which ensures the convenient and quick conversion of the exhalation and inhalation two-tube circuit system.

11. The pumping capacity of the air pump is 40L/min~100L/min

12. The ventilation rate is constant at (85±1) L/min

13. Power supply: AC220V, 50Hz

14. Applicable to the latest national standard requirements, compatible with labor insurance protective masks and daily protective mask standards

Applicable standards

GB 2626-2019 Respiratory protection--Non-powered air-purifying particle respirator 6.5 6.6

GB/T 32610-2016 Technical specifications for daily protective masks

GB 2890-2022 Respiratory protection-Non-powered air-purifying gas mask 6.9

GB 19803-2023 Protective face mask for medical use