Industrial 125BBPA685 Adjustable Flow Monitor

The ChemTec 125BBPA685 Adjustable Flow Monitor is a bypass-style, low-flow monitor from the 125 BP Series that uses a magnetic piston to actuate a hermetically sealed reed switch, delivering a switch-contact output when the flow crosses the set point. It is designed to monitor gases or liquids in industrial lines and features 1/8" FNPT ports for straightforward installation. The set point is adjustable, with the device optimized for a flow ratio (normal flow to set point) of 10:1 or less, and it provides high-resolution, close-on-off differential signaling. Wetted parts are available in 316 stainless steel, brass, or PTFE (Teflon); maximum working pressure depends on material: 316SS up to 3000 psi, brass up to 1500 psi, and PTFE up to 100 psi. Weight varies by material, with about 16 oz for metal configurations (316SS or brass) and around 4.4 oz for PTFE versions. The unit’s operation places the magnetic piston in a bypass leg when flow is present; as main-line flow adjusts, a small bypass flow lifts the piston to actuate the reed switch, signaling flow status. This compact monitor is suitable for vacuum systems, wet stations, gas analyzers, cooling systems, and general industrial fluid lines. All ChemTec products are designed and manufactured in Deerfield Beach, Florida, USA, emphasizing robust construction and field-adjustable configuration for precise flow monitoring.