MacPress is a regular pressure switch for hidrofor systems with expansion vessel.

MacPress must be installed on the pipe, where it can sense the system’s pressure. The device operates between two pressure value: a starting, and a stopping pressure value.

When the system’s pressure drops below the pre-set start pressure (by opening a tap), MacPress sense it, and start the pump. When the water collecting process is over, and we close the tap, the pressure will increase. When the pressure reach the pre-set stopping value, stop the pump.

The housing colors: Blue is one phase, red is three phase

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Operates between two pressure value (starting and stopping). When the pressure in the system drops below the starting value, the pressure switch start the pump. As soon as the pressure increase in the system, and reach the stopping value, the pressure switch will shut down the pump.

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PM/5-3 W

PM/5-2 W

This pressure switch is a PM/5 but widen with a housing. The housing contain 3 or 2 threads (see the data sheet) for easy install on the hidrofor system, and a pressure gauge.

The operation principle is the same as the PM/5 pressure switch:

Operates between two pressure value (starting and stopping). When the pressure in the system drops below the starting value, the pressure switch start the pump. As soon as the pressure increase in the system, and reach the stopping value, the pressure switch will shut down the pump.

In case of direct connections (when the MP/5-3 W turn on/off the motor), the motor’s power cannot be higher than 1.1 kW. With an adequacy magnetic switch it can be increased.

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PS pressure switches are for different technological water system control. They are used most in firefight water systems. With the SPDT relay contact, can operate two pump at once:

If the electric pump stop by any malfunction, the pressure in the firefight water system will cease. The pressure switch sense the drop, and the SPDT microswitch will switch on a pump drived by petrol engine.

The fire sprinkler system supplied by the electric pump.

The electric pump failed, the pressure dropped. PS pressure switch sense the pressure drop, and switched to the petrol engine pump.

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• Pressure switch for the protection of water systems (autoclave and fi re-fi ghting systems) and pneumatic systems (control circuits under pressure)
• The device interrupts the electric connection between the line and the load when the pressure decreases below the established value (stop pressure)
• In the autoclave systems it is matched in series with a PM/5 pressure switch in order to protect the electric pump from dry running
• The reset is automatic when the pressure becomes again higher than the start value or when pressing the reset button
• Double electric contact: normally open, made of brass alloy with Ag-Ni surfacing
• Terminals with M4 screws and 8×8 mm pressure dice
• NBR rubber membrane with food grade textile insert
• ¼” F hydraulic connection made of galvanised steel
• Standard protection degree IP 44
• Max ambient temperature: 55°C
• Tear resistant cable clamps

Warning!

The pressure of the watercolum within the pipes cannot be greater than the stop pressure.

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• Vacuum switch, useful for protecting the pump against dry running during draining of basins, tanks or cisterns
• The switch, which is fi tted on the suction pipe, controls the vacuum generated by the pump
• The system is activated manually using the start lever which, when lowered, starts the pump running; this action leads to the creation of the vacuum which automatically determines the closure of the contacts. When the liquid supply is about to run out, the vacuum in the suction line disappears and so the switch deactivates the pump
• Variable distance between the switch and the end of the suction pipe (from 0 to 4 m / 0 to 157 ½ inches)
• Normally open brass alloy contacts with Ag-Ni insert
• Oil-resistant NBR rubber membrane
• Max ambient temperature 55°C

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