The Honeywell FRN series flow switch guide describes low‑flow, low‑pressure‑drop switches, their specifications, materials and ordering options.
The FRN series from Honeywell is designed for applications that require very low flow and minimal pressure drop. The switches use a free‑floating sensor element, need no additional mechanical trigger, and are built for reliable, maintenance‑free operation. Two housing options are offered: a lightweight Noryl thermoplastic body and a zinc‑plated brass body for harsher environments.
The product line includes AC versions rated at 250 Vrms / 3 A and DC versions rated at 300 Vdc / 0.5 A / 10 W. They can be installed on 15 mm, 22 mm or 28 mm pipe sizes and are suitable for hot‑water (up to 85 °C) and cold‑water service, with a maximum measurable pressure of 7 bar. This manual is written in Chinese.
| AC voltage rating | 250 Vrms, 3 A |
|---|---|
| DC voltage rating | 300 Vdc, 0.5 A, 10 W |
| Maximum pressure | 7 bar |
| Flow range (water) | 1 – 1.10 L/min |
| Housing material (option 1) | Noryl (UL‑approved) |
It can measure pressures up to 7 bar.