Controls, Safety & Regulation
Flow Switches
Type R35 - Piston flow switches, reed switch contact, inlet and outlet ½" BSPP male,

Type R35 - Piston flow switches, reed switch contact, inlet and outlet ½" BSPP male,

Controls, Safety & Regulation
Flow Switches
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Main applications

Product developed for electrical or gas instantaneous water heaters. ½" BSPP male water inlet and outlet. Mandatory vertical mounting, with water inlet from the bottom.

Functional principle

Magnetic piston mounted in line with the flow and activating a reed switch through the wall.

The return of the piston is made by gravity. No seal or liquid can pass between the piping system and the electrical contact. Suitable for potable water. Must not be used for water containing magnetic particles or high viscosity liquids,which block the movement of the piston.

Adjustment: Can be factory set by adjusting the piston diameter and piston weight

Body material: PPO compatible with drinking water.

Piston: PPO

Electrical rating: Max 1A, Max 70W, Max 250V, resistive load. Use on inductive circuits reduces electrical rating. We recommend to protect the reed switch with contact protection device when used in inductive loads

Electric contact type: Normally open, closes by flow rise

Liquids compatibility: For use with clean water and liquids without magnetic particles and without chemical incompatibility with PPO

Nominal pressure at 20°C: 1MPa (PN10)

Flow detection set point factory setting limits:

- Close by flow rise: 1 to 12 L/min

- Open by flow decrease: About 0.4 to 0.5L/min lower than close value

Nominal diameter: DN15

Mandatory mounting position: on vertical pipes, upstream flow

Water pipe connection: Water inlet and outlet: ½" BSPP male fitting (Needs gasket)

Liquids temperature range: 5 to 80°C

Ambient temperature range: 5 to 50°C

Overpressure valve calibration value: 1.5 MPa +0.5, -0

Ingress protection: IP65

Electrical connection: 2 × AWG24 wires (0.2mm²), PVC insulation, T80°, standard length 300 mm.

Options (MOQ apply):

- Wires with connector or terminals,

- Other wire lengths,

- Other calibration values

- Two contacts

- Upside water inlet, ( by adding an internal stainless steel piston spring)

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