The main purpose

The anti-dry microbial penetration experiment system is composed of air source generation system, detection body, control system and other parts. It is used to perform anti-dry microbial penetration test methods on surgical drapes, surgical gowns and clean clothes.

Scope of application

Dry microbial penetration resistance tester/Dry microbial resistance tester is used to determine the resistance of the material to the penetration of bacteria on dry particles within the size range of human dander. During the test, the sample is fixed on a container.

Standards compliant

YY/T0506.5-2009 Surgical drapes, surgical gowns and clean clothes for patients, medical staff and instruments-Part 5: Test method for preventing the penetration of dry microorganisms

YY/T 1799-2020 Technical requirement of re-usable protective clothing for medical use 4.2.2.4

ISO 22612:2005 Protective clothing for infectious agents-Test method for resistance to penetration of dry microorganisms

BS EN 13795:2011+A1:2013

YY/T 0506.1-2023    Surgical drapes, gowns and clean air suits for medical use-
Part 1:General requirements
YY/T 1871-2023  Isolation gowns for medical use

T/CTES 1013-2019 Technical specification for classification and performance of protective apparel and surgical drape

technical parameter

1. Vibration form: pneumatic ball vibrator

2. Vibration frequency: 20800 times/min

3. Vibration force: 650N

4. Workbench size: 40cm×40cm×10mm

5. Workbench medium: marble slab

6. Experimental container: stainless steel experimental container

7. Working positions: 6

8. Equipped with biological safety cabinet

8.1. The biological safety cabinet adopts four-sided negative pressure, that is: the left and right sides, rear and bottom walls of the entire device are all negative pressure air ducts, so that the working area and the external environment form an air curtain and double-layer isolation of the box, and work at the same time The zone is surrounded by negative pressure to ensure that the sample does not leak.

8.2. Biological safety performance: personnel safety, the number of microbial colonies in the impact sampler is less than or equal to 10CFU/time, and the number of colony in the slit sampler is less than or equal to 5CFU/time

8.3. Airway tightness: The airway of the device is subjected to a pressure of 500Pa for 30 minutes, the pressure drop is ≤10%, and no bubbles appear in the penetrating part under the soap bubble test conditions.

8.4. Cleanliness level: Class 100, which means that the dust content of particles ≥0.5um per IL air is ≤0.35

8.5. Noise: the height of the table, 30cm away from the front window and 38cm upward, under the condition of an ambient noise of 55Db, the arithmetic average straightness in four directions is less than or equal to 58dB (A)

8.6. Lighting: ≥680LUX Front window glass: toughened, anti-ultraviolet

8.7. Ultraviolet intensity: ≥80uw/cm2

8.8. Differential pressure display: (30/2) digit liquid crystal display, American GE differential pressure sensor. The number displayed on the liquid crystal display indicates the pressure loss of the filter, and the error of the differential pressure sensor is ≤5%

8.9. Mechanical performance: The equipped table should be able to withstand 25Kg pressure without obvious sinking, bending and other deformation.

8.10. Dielectric strength: withstand voltage of 1500V without breakdown in 1 minute

8.11. Sump: used to collect splashing liquid in the work area and equipped with a drain valve.

8.12 The ultra-high efficiency filter is suitable for filtering particles, smoke and microorganisms in the air. The imported ultra-high efficiency filter (ULPA) has a filtration efficiency of more than 99.999% (0.3μm PAO method), making the working space cleanliness of class 100. Equipped with a dual-channel digital differential pressure display and an electronic alarm system to dynamically display the pressure loss of the exhaust and supply air filters in real time, the downflow velocity and the inflow velocity in the operating area, dual detection, when the downflow velocity and the inflow velocity fluctuate When it exceeds 20% of its nominal value, an audible and visual alarm will alert the downflow velocity and fluctuations. Replace and repair filters and fans beforehand.

8.13. When the opening height of the front window of the safety cabinet exceeds the specified height of the front window operation port, the sound and light alarm will be activated and the interlocking system will be activated. When the opening height falls within the specified opening height, the alarm interlock system is automatically released.

9. Working voltage: 220V 50Hz

Main description

   The dry microbial penetration resistance tester/dry microbial resistance tester is specially used to determine the resistance of materials to the penetration of bacteria on dry particles within the size range of human dander.

   During the test, the samples are fixed on a container respectively. Among these containers, 5 containers carrying Bacillus subtilis talc powder, and 1 container with uncontaminated talc powder as a control. Insert a petri dish at the bottom of each container close to the time below.

   The equipment supporting the container is oscillated by a gas ball oscillator, all the talcum powder penetrating the sample falls on the petri dish, and the petri dish is removed for culture. The results of the experiment were evaluated by counting the growing colonies.