Scope of Application

【Operating Instructions】

This instrument complies with the requirements of GB 24540-2009 "Protective clothing — Protective clothing against chemicals — Test methods". It can be used to determine the spray liquid tightness and jet liquid tightness of chemical protective clothing. It is suitable for various industries and organizations such as textile and apparel, petrochemical, occupational safety, and quality supervision and inspection, providing a scientific and reliable basis for the development of chemical protective clothing, quality control during production, and evaluation of liquid tightness performance during use.

**YS-707M Chemical Protective Clothing Liquid Tightness Test System**

**【Scope of Application】**  

This instrument complies with the requirements of GB 24540-2009 "Protective clothing — Protective clothing against chemicals — Test methods". It can be used 

to determine the spray liquid tightness and jet liquid tightness of chemical protective clothing. It is suitable for various industries and organizations such as textile 

and apparel, petrochemical, occupational safety, and quality supervision and inspection, providing a scientific and reliable basis for the development of chemical 

protective clothing, quality control during production, and evaluation of liquid tightness performance during use.

**【Applicable Standards】**  

GB 24540-2009 "Protective clothing — Protective clothing against chemicals — Test methods";  

GB/T 24539, BS EN 468, ISO 17491-3, ISO 17491-4, and other standards.

**【Test Principle】**  

After spraying (spray method) or splashing (splash method) a test solution onto chemical protective clothing worn on a test mannequin or human subject at a specific pressure 

and flow rate for a specified time, the inner surface of the chemical protective clothing and the surface of the absorbent indicating garment worn under it are examined. The liquid 

tightness of the chemical protective clothing is evaluated by comparing the staining with standard stain size references.

**Instrument Structure**

The chemical protective clothing liquid tightness test system mainly consists of a liquid supply system, a liquid spraying system, and a rotating mannequin platform.

**1. Liquid Supply System**  

The liquid supply system includes: a water supply tank, a supply pump, a return pump, a human‑machine interface, and an electrical control system. The operator controls the test 

process through the human‑machine interface (high‑performance embedded integrated touch screen).

**2. Liquid Spraying System**  

The liquid spraying system consists of two main parts: the jet system and the splash system.  

- **Jet system:** Comprises a jet nozzle, a jet shield, a nozzle lifting mechanism, a pressure gauge, a jet pressure regulating valve, and a jet pressure stabilizing valve.  

- **Splash system:** Comprises a splash nozzle, a splash shield, a flow meter, a pressure gauge, and a splash pressure stabilizing valve.

**3. Rotating Mannequin Platform**  

The rotating mannequin platform includes a rotation mechanism, a forward/backward movement mechanism, and positioning control.

**Main Technical Specifications**

1. **Turntable rotation speed:** 1 r/min  

2. **Supply pressure:** 300 kPa (splash test) / 150 kPa (jet test)  

3. **Splash flow rate:** 1.14 ± 0.1 L/min  

4. **Power supply:** AC 220 V ±10% / 50 Hz  

5. **Total power:** ≤ 1.65 kW