Jiwei Develops Advanced 5.6-Meter Liquid Level Switches for Enhanced Acrylonitrile Safety

Recently, a chemical enterprise in Shandong placed an order for two sets of extended Tuning Fork Liquid Level Switches for measuring the level of acrylonitrile. These switches feature an extension length of 5.6 meters from the flange, which is exceptionally rare in the market. Currently, Jiwei is the only domestic manufacturer in China capable of producing 5.6-meter-long Liquid Level Switches.

The client highlighted the challenge of measuring low liquid levels of acrylonitrile to effectively prevent dry operation of the system. Since lateral drilling of the container body is not feasible, the measurement must be conducted from the top. Additionally, acrylonitrile is a flammable liquid, and its vapors can form explosive mixtures with air under ambient conditions, posing significant fire or explosion hazards.

Due to these characteristics, the level meters must exhibit high performance standards: they are required to pass the SIL2 Functional Safety Assessment Certification, achieve at least an Ex d IIC T4 Explosion-Proof rating, and have an IP65 Protection Level or higher. Jiwei’s 5.6-meter-long Ring-11 Liquid Level Switches exceed these requirements, having passed the SIL2 / SIL3 Functional Safety Assessment. They are certified for both Intrinsic Safety (Ex ia IIC T6~T1 Ga) and Flameproof Enclosure (Ex d IIC T6~T1 Gb) explosion protection, with an IP66/IP67 Protection Level, thus surpassing the client’s expectations.