The 6773 double diaphragm pressure switch from Herga

Precision and safety in coffee machines

What is a double diaphragm pressure switch?

Double diaphragm switches belong to the family of pressure switches that are activated by a change in pressure in gaseous or liquid media. The switching contact is either closed or opened. This function can be carried out mechanically or electronically. Conventional pressure switches generally only use a single diaphragm. In comparison, the two diaphragms of the double diaphragm switch offer an additional level of safety.  The pressure-sensitive switching element can measure pressure in a precise and stable manner and thus monitor and react effectively to changes in a system.

The 6773 double diaphragm pressure switch from Herga

The 6773 double diaphragm pressure switch from Herga combines robustness with flexibility. Its housing is made of durable thermoplastic, making it suitable for a wide temperature range from -5 ºC to +70 ºC and pressure ranges between 20 mbar and 690 mbar.

1. High precision: the switch reacts reliably to the slightest changes in pressure.

2. Compact design: Thanks to its design, it can be easily integrated into tight spaces such as coffee machines.

3. Durability: The 6773 is designed for long-term use in demanding conditions.

4. Safety function: With the ability to continuously monitor the pressure, it contributes significantly to the prevention of overpressure problems.

5. Robust materials: The switch is made of resistant materials that can withstand both mechanical stress and chemical influences.

Further features of the 6773 are

- Double insulation for conductive media

- Optional gold contacts for increased conductivity

- Temperature compensation, if required

For detailed technical information, please refer to our product data sheet.

Application in coffee machines: The 6773 double diaphragm pressure switch as overpressure protection

The 6773 double diaphragm pressure switch is used in coffee machines, especially in the nozzle set. Its main purpose is to act as an overpressure safety device and thus ensure the safety of the system. The two diaphragms inside the switch detect the pressure on both sides. The jet system of a coffee machine generates a back pressure of around 15 PSI (pounds per square inch) during normal operation. This back pressure is crucial for the optimal function of the pump and the quality of the brewed coffee. Under normal operating conditions, the switch remains in its standard setting. If the pressure rises and exceeds the set threshold, the double diaphragm switch detects this deviation. The position of the diaphragms changes and triggers the pump to switch off. This prevents potential damage to the machine and ensures user safety.

Why is the 6773 double membrane switch ideal for coffee machines?

The demands placed on coffee machines are high: they must work precisely, efficiently and safely. The 6773 double diaphragm switch fulfills all these criteria. Its ability to measure pressure accurately and react quickly to anomalies makes it indispensable for the safe operation of modern coffee machines.

- Quality assurance: The coffee quality remains constant thanks to the regulated pressure.

- Machine protection: The switch protects the internal components from damage caused by excess pressure.

- User-friendliness: Thanks to the automatic switch-off in the event of deviations, it ensures worry-free operation.

The 6773 double diaphragm switch from Herga combines safety and efficiency. It plays a crucial role in coffee machines in particular by acting as an overpressure safety device and switching off the pump in the event of abnormal pressure. With its robust design and reliable functionality, this switch helps to maximize the service life and performance of modern coffee machines.

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