I. Product Overview
The Closed Sampling Box Series is designed for sampling various media in petrochemical process systems, particularly toxic, hazardous, flammable, and explosive media, as well as leak-free sampling of medium- and low-pressure gases.
The collected samples provide high representativeness and sampling accuracy, with no residual liquid or waste gas discharge. The system effectively reduces the risk of operator exposure to toxic and hazardous media while also helping prevent environmental contamination and potential accidents during the sampling of flammable or explosive substances.
The closed sampling system is designed to meet relevant environmental protection, fire protection, and explosion-proof requirements.
During closed sampling, the sample taken from the process or equipment pipeline is returned to the process line or directed to a discharge line, forming a closed circulation loop. This allows the entire sampling process to be completed without exposing the process medium to the atmosphere, reducing the risk of personnel injury and environmental contamination.
For gaseous media or volatile liquid media, samples are collected in a stainless-steel sealed sampling cylinder. Needle valves are installed at both ends of the cylinder for safe and reliable control, while stainless-steel quick connectors allow the sampling cylinder to be installed and removed safely, conveniently, and quickly.
For non-volatile liquid media, a closed pressure-resistant bottle or standard wide-mouth bottle is used for sample collection. The closed structure provides excellent sealing performance, while the stainless-steel protective sleeve helps protect the operator during sampling.
II. Sampling Features
The closed sampling system provides:
- Closed-loop sampling without direct exposure of the process medium to the atmosphere
- Reduced discharge of residual liquid and waste gas
- Improved protection against toxic and hazardous media
- Reduced risk during sampling of flammable and explosive substances
- Stainless-steel sealed sampling cylinders for gas and volatile liquid media
- Needle-valve control at both ends of the sampling cylinder
- Stainless-steel quick connectors for convenient installation and removal
- Closed pressure-resistant bottles or standard wide-mouth bottles for non-volatile liquid media
- Stainless-steel protective sleeves for improved operator safety
III. Technical Specifications
| Parameter | Specification |
|---|---|
| Applicable Media | Suitable for sampling most liquid, gas, liquefied gas, and mixed gas-liquid media |
| Sampling Temperature | -20 to 450°C |
| Design Pressure | 0–20.0 MPa |
| Pressure Requirement | To ensure sample circulation, the pressure difference between the sampling inlet and outlet should be greater than 0.01 MPa |
| Sampling Volume | 250 mL or 500 mL |
| Structure | The BQM closed sampler is based on an online sampler and consists of a cabinet, valve piping components, sampling cylinder / closed pressure-resistant sampling bottle, flanges, pressure gauge, and other components |
