Operation steps of medical mask breathing resistance tester

The new type of respiratory resistance tester for medical masks has a simple structure and strong functionality. The testing process is extremely smooth and simple, and the testing quality can be guaranteed. There are very few breakdowns or damages. The testing efficiency is greatly improved and the production cost is low. This is our test equipment independently developed and produced by Qisnun Precision Mechanical and Electrical Technology Co., Ltd. Since the air inlet pipe and the air outlet pipe are equipped with digitally controlled shut-off valves and solenoid valves, the airflow value can be arbitrarily adjusted during the test, which which can effectively improve the accuracy of the test and avoid the occurrences of Inaccurate test, the test results of the protective effect are guaranteed. Since the head mold for fixing the sample is bolted to the frame, the head mold for fixer sample can be disassembled and replaced. Several sets of head molds for attachment use different sizes. ThSizes are used to simulate the respiratory conditions of children, young people and adults respectively. Large, medium and small fixed headforms correspond to large, medium and small trials respectively. Their filtration efficiency can be compared to test the performance of the same material in different uses. The utility model is designed in strict accordance with the relevant national standards and testing requirements for the self-priming filter anti-particle respirator detection system for respiratory protective equipment. It can be widely used in independent testing or comparison of various daily protection performances. Testing can effectively resolve back-end technology issuesLan.

Technical specifications:

1. The instrument consists of an air source capable of adjusting the flow rate and a human head mold specified by the standard. , two sets of pipeline systems for inspiration and expiration, and a respiratory resistance measurement system.

2. The flow sensor has high sensitivity and very low initial flow.

3. The flow sensor chip uses a thermal mass flow meter, which does not require temperature and pressure compensation, ensuring high accuracy sensor measurement.

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

5. The flow sensor features high zero point stability, high full-range stability, high full-range accuracy, and excellent repeatability. It presents the characteristicsticks of low power consumption, low pressure loss and fast response speed.

6. There are 4 MB of memory in the data logger to record the measurement values.

7. The micromanometer sensor adopts a two-wire system with high precision and good stability. It adopts explosion-proof design and is safe and reliable to use.

8. The micromanometer sensor range and zero point are continuously adjustable from the outside, the damping is adjustable, there are no moving mechanical parts, and the maintenance workload is low.

9. The entire instrument uses special gas path conversion components to provide convenient and quick conversion between exhalation and inspiration pipe systems.

Operation steps:

1. Preparing to power on

Before powering on the host, you need to confirm that theThe power supply is 220 VAC, 50 Hz and the supply voltage does not fluctuate within this range. Greater than ±7%. Power on, welcome to the interface, and turn on the instrument to preheat it to the standard test environment. The preheating time is increased, 30 minutes less. If the preheating time is less than 30 minutes, it will affect the test results.

2. Sample preparation

Refer to the introduction to the “Sample preparation” section to prepare a number of samples for testing. The number of samples should be generated and should not be less than 5. Visual inspection of the specimens should show no obvious defects.

　3. Perform the test

　(1) Set the test duration and flow rate;

　(2) Carry the test sample on the false test head and adjust the mask The wearing position and tightening of the headband ensures a tight fit between the mask and thehas false test head. During the test, take appropriate measures to prevent the sample from being adsorbed at the mouth of the breathing tube;

(3) Click the test to start the test;

(4) After the test is completed, the system will automatically determine the test results, the test results show pass/fail; Notes: The standard states that when the gas flow is 85 L/min, the inhalation resistance is ≤ 175 Pa; the expiratory resistance is ≤145Pa.

4. Test the next set of samples. If you need to continue testing, simply repeat the testing steps above.

5. After the test, click the \"Back\" button to return to the main interface. Cut off the power supply and the air source of the equipment, and cover the dust-proof cloth. The dust cloth should be kept clean and tidy without dust.

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