Electromechanical level switch SOBA

tiltfloatfor wastewater

Overview
The SOBA level regulator is designed for level control in charged wastewater and other contaminated liquids. It detects level by the inclination of a biconical float which actuates a mechanical contact to open or close a circuit for pump control or alarm activation.

Usage and benefits
Used in pairs (minimum two floats) it enables control of low and high levels in tanks or sumps. It is suitable for environments where magnetic level controllers are impractical due to deposits or solids. The factory-fitted adjustable 250 g resin ballast ensures a stable pivot point and allows operation across a wide range of fluid densities. The ±25° switching angle provides accurate level detection. The device can be configured for high or low alarm (overfill protection or dry-run protection).

Operating principle
The float moves freely with the liquid level; at a preset position it tilts and changes the state of an integrated mechanical switch according to the chosen wiring mode (fill or drain). The three-core cable (COM, NO, NC) permits selection of the operating mode.

Drain mode
In drain mode the switch starts the pump when the float reaches the high position; when the tank empties the switch opens the circuit to stop the pump and protect equipment.

Fill mode
In fill mode the circuit closes (NC) when the float reaches the low position, starting the pump to fill the tank.

Installation guide — ballast positioning
The trigger point depends on liquid agitation, flow and ballast position on the cable. Adjusting the ballast modifies the pivot and the level differential required for switching. Indicative values for SOBA: min Y = 10 cm / X 25–30 cm; max Y = 30 cm / X 45–50 cm.

Wiring and mounting
The float can be suspended from the cable sheath using the FIXCAB accessory. Electrical connections in wet areas must be sealed and housed outside the tank. Cable length can be supplied on request to avoid splices.

Key features

• Omnidirectional detection — biconical shape for agitated liquids.
• Factory-adjustable 250 g resin ballast to tune pivot point.
• Polymer design reducing deposit build-up; minimal maintenance required.

Recommended accessories

• FIXCAB cable clamp
• Control relay / pump starter
• Multifunction socket for pump control
• Clip-on ballast (e.g. 275 g)

Technical specifications

• Switching angle: ±25°
• Allowed fluid density: 0.70 to 1.15 kg/dm³
• Maximum operating pressure: 3.5 bar
• Maximum temperature: 85 °C
• Ingress protection: IP68
• Housing: copolymer polypropylene (biconical shape)
• Cable: 3 x 1 mm² neoprene (HR HY)
• Float weight (without cable): 200 g
• Ballast: 250 g loaded resin (adjustable on cable)
• Cable lengths (standard): on request (5, 6, 10, 13, 15, 20, 25, 30 m)
• Electrical ratings: multiple supply options (e.g. AC 250 V — resistive up to 16 A, inductive up to 6 A; DC 48 V — resistive up to 1.5 A, inductive up to 0.8 A); actual values depend on supply and contact configuration.