The 6773 Double Diaphragm Pressure Switch is a special mid-size switch to meet EN 60335-2-60 insulation.
The Herga 6773 Double Diaphragm Pressure Switch is a mid-sized, double-insulated pneumatic switch designed for reliable performance in environments that demand both electrical safety and mechanical precision.
Compliant with EN 60335-2-60, it is ideal for use in wet or conductive media where standard insulation may not be sufficient.
This model utilizes a dual-diaphragm design, which provides complete separation between the pneumatic and electrical chambers, ensuring enhanced insulation and protection — especially important in medical, spa, and hygiene-critical applications.
A diaphragm pressure switch converts air or fluid pressure into an electrical signal.
When the applied pressure exceeds a set threshold, the diaphragm deflects, actuating a microswitch.
In the double diaphragm design, two independent membranes are used:
The primary diaphragm detects the air or fluid pressure.
The secondary diaphragm acts as a safety barrier, providing double electrical insulation from the conductive medium.
This makes the 6773 model ideal for applications involving water, saline, or conductive fluids where leakage or electrical isolation could be a risk factor.
Double insulated for use with conductive media
Multiple cap and spout configurations (side or back entry, 2 mm or 4 mm Ø)
Gold or silver contact options
Temperature compensation available for stable operation
Pressure range: 20 – 690 mbar
Contact types: SPST N/O or SPCO
Electrical rating: up to 21 A / 250 V AC (2 HP)
Operating temperature: −5 °C to +70 °C
Body material: thermoplastic
Weight: 23 g
Spa and hydrotherapy equipment (safe operation in wet conditions)
Medical and laboratory systems (insulated pneumatic control)
Water filtration and flow monitoring
Industrial air or fluid systems requiring low-to-medium pressure actuation
HVAC and cleaning systems
The double-diaphragm architecture provides:
Electrical safety: two membranes separate the pressure medium from the switch contacts.
Reliability: protection from condensation, leaks, and corrosion.
Precision: smooth activation with minimal hysteresis.
Versatility: customizable configurations for spout, pressure range, and contact material.
