Flygt leakage sensor FLS10 6630400

Flygt Leakage Sensor FLS10 (Part No. 6630400)

The Flygt FLS10 is a specialized leakage detection sensor designed for Xylem's new generation midrange submersible pump series. It monitors liquid intrusion in the pump's inspection chamber, providing early warning of potential seal failures or housing breaches.

Introduction

Technical Specifications

- Part Number: 663 04 00

- Operating Principle: Current-sensing float switch that changes circuit resistance upon liquid detection

- Electrical Characteristics:

- Supply Voltage: 12 V DC

- Non-alarm Resistance: ~1,200 Ω (10 mA current)

- Alarm Resistance: ~430 Ω (28 mA current)

- Physical Properties: Stainless steel and nitrile rubber construction; dimensions 44mm length × 22mm diameter with M12×1 thread

- Temperature Rating: Maximum 90°C continuous duty

Application Range

Specifically engineered for these pump models introduced after 2000:

- 3153 series

- 3171 series

- 3202 series

- 3301 series

Functionality & Integration

The FLS10 works in conjunction with the MiniCAS II supervision relay, which monitors current levels and triggers leakage alarms when resistance drops below the threshold. Unlike stator-housing sensors (FLS), the FLS10 detects intrusion in the inspection chamber—a less critical zone that typically triggers alarms without automatic pump shutdown, allowing operators to assess the situation. For explosion-proof installations, it's approved for use with thermal switches in Ex-certified pumps.

Installation & Testing

The sensor connects via two-wire, polarity-independent leads to the MiniCAS II relay. Testing can be performed with a standard ohmmeter—resistance should read approximately 1,200 Ω in dry conditions and drop to ~430 Ω when activated. Never apply more than 14 V DC to avoid sensor damage.