APLISENS ERH-01-06-2 Level Switch

APLISENS ERH-01-06-2 Float Level Switch (Marine Version)

The APLISENS ERH-01-06-2 is a magnetic float level switch engineered for point-level signalling, low/high-level alarms, and two-position pump/valve automation in marine service tanks, atmospheric reservoirs, and process vessels. Designed to withstand continuous engine-room vibration, mechanical shock, and aggressive maritime atmospheres, the ERH-01-06-2 relies on magnetic coupling across a hermetically sealed barrier. This isolation prevents process fluids and vapors from penetrating the electrical enclosure, mitigating leak paths and sensor contamination.

All wetted components—including the operating lever arm and cylindrical float—are fabricated from acid-resistant AISI 316L (1.4404) stainless steel, ensuring long-term resistance to heavy fuel oils, marine diesel oils (MDO/MGO), lube oils, cooling water chemicals, and raw bilge water.

Model Details

• Manufacturer: APLISENS S.A.
• Product Series: ERH Side-Mount Float Level Switch Series
• Exact Model / Order Code: ERH-01-06-2
• Manufacturer Part Number (MPN): ERH-01-06-2

Model Code Structure:

• ERH-01: Horizontal side-mounting body equipped with standard square flange (92 mm × 92 mm, PCD 92 mm).
• -06: Maritime marine-execution version (IP66 aluminum alloy enclosure with salt-mist resistant marine coating, screw-terminal cable entry).

Features

1. Magnetic Barrier Isolation: Lever motion drives an internal permanent magnet across a solid non-magnetic separation wall, eliminating dynamic elastomeric shaft seals and eliminating ingress into electrical switches.
2. Heavy-Duty Electrical Microswitch: High-capacity silver-plated SPDT contacts rated for AC-15 (400 V AC, 10 A) and DC-13 (220 V DC, 0.6 A), capable of piloting starter coils and heavy relays directly without interposing contactors.
3. High Corrosion Resistance (AISI 316L): All wetted parts (float, pivot mechanism, flange face, and lever arm) are manufactured from AISI 316L stainless steel for extended operational life in maritime media down to a minimum fluid density of 0.70 g/cm³.
4. Vibration-Damped Switching Mechanism: Optimized mechanical detent prevents microswitch chattering and false alarms caused by ship hull vibration, sea swell, and fluid agitation.
5. Marine Certified Design: Meets unified IACS construction requirements for installation aboard commercial sea-going vessels and offshore rigs (DNV, BV, PRS compliance).

Technical Details

Compatibility

• Mating Counter-Flanges: Fits direct to standard Aplisens weld-in counter-flanges ER2-1646-1 (carbon steel) and ER2-1646-2 (AISI 316L stainless steel).
• Drop-in Dimensional Replacement: Interchangeable with side-mount 92 mm × 92 mm 4-hole square flange arrangements commonly manufactured by:
  • Mobrey (Emerson): 003 series, horizontal float switches.
  • KDG / Mobrey: Flanged models fitting 92 mm pitch centers.
  • VEGA / Endress+Hauser: Flanged chamber side mounts using 92 mm square conversion spools.
  • Yongsung / Dae Sung / KOBOLD: Standard 92 mm marine pattern level controllers.
• Automation Platform Interoperability: Compatible with all marine automation, alarm monitoring, and control systems (AMS / ICMS) including Kongsberg K-Chief, Siemens S7-300/1200/1500, Valmet DNA, ABB Ability Marine, and standard wheelhouse alarm consoles.

Part Number Cross-References

• Exact Item: APLISENS ERH-01-06-2
• Shorter Reach Variant (10 mm Hysteresis): APLISENS ERH-01-06-1
• Long Reach Variant (30 mm Hysteresis): APLISENS ERH-01-06-3
• Submersible IP68 Sister Model: APLISENS ERH-01-07-2
• Hazardous Area ATEX Sister Model: APLISENS ERH-01-16-2 (Ex II 1/2G c Ex de IIB T4 Ga/Gb)
• Full Stainless Steel Variant: APLISENS ERH-01-06-K/S-2
• Direct Marine Legacy Equivalents: Controlmatica ERH-01-06-2 / ERH-01-04-2

Frequently Asked Questions

What is the specific gravity threshold for media monitored by the ERH-01-06-2?

The minimum medium density required to reliably displace the float and trigger the internal microswitch is 0.70 g/cm³ (700 kg/m³). This makes it compatible with light marine diesel, heavy fuels, hydraulic fluids, and water.

What is the difference between ERH-01-06-1, ERH-01-06-2, and ERH-01-06-3?

The final suffix identifies the mechanical hysteresis (the vertical travel distance between switch actuation and reset):

• ERH-01-06-1 provides a 10 mm hysteresis.
• ERH-01-06-2 provides a 20 mm hysteresis (the standard general-purpose marine setting).
• ERH-01-06-3 provides a 30 mm hysteresis (better suited for agitated fluids).

Can the ERH-01-06-2 be installed inside hazardous (Zone 0/1) explosive atmospheres?

No. The ERH-01-06-2 is the IP66 weatherproof marine version intended for general machinery spaces, engine room service tanks, and unclassified zones. For hazardous zones requiring explosion-proof protection (such as cargo fuel tanks or paint lockers), select the explosion-proof certified sister model ERH-01-16-2 or ERH-01-16.1-2 (ATEX II 1/2G Ex de IIB T4).

Can I change the switch operation from normally open (NO) to normally closed (NC)?

Yes. The ERH-01-06-2 houses a changeover SPDT (Single Pole Double Throw) snap-action switch. You change output behavior simply by swapping the external field wiring between Terminal 2 (NC) and Terminal 3 (NO) relative to the common Terminal 1.

Does this switch require external power to operate the sensor mechanism?

No external auxiliary power is required to operate the level switch itself. It is a completely passive, mechanical-magnetic device. The internal microswitch is activated mechanically by float motion and merely interrupts or completes the control circuit voltage you supply to the terminals.