The Telemecanique XMP pressure switch automatically starts a pump when water use lowers system pressure, then stops it when pressure rises to the upper setting. Used with a pressure tank, it allows stored water to be drawn between pump starts. Mechanical adjusters beneath the cover set the start and stop pressures. The switch suits single-phase pump motors up to 1.5kW at 230V.
Pressure connection: 1/4" BSP female thread (G 1/4).
Stop-pressure adjustment range is 130–1200 kPa. Start-pressure adjustment range is 30–1030 kPa. The permitted gap between them varies with the chosen settings, so select the start/stop pair using the adjustment chart in the installation instructions. The pump must be able to reach the chosen stop pressure.
Pressure is set using a hand-turnable knob and an adjustment nut beneath the removable cover. The installer checks the actual start and stop pressures on a separate pressure gauge. Isolate electrical power before removing the cover.
As water is drawn from the pressure tank, pressure falls until the switch starts the pump. The pump then refills the tank and raises pressure until the switch stops it. The gap between the two settings is the pressure differential.
The switch is rated for fresh water, sea water and air at 0–70°C, with a maximum pressure rating of 1200 kPa. Its IP65 enclosure protects against dust and water jets.
Two normally closed contacts open at the stop setting and close again at the start setting. The switch has screw-clamp electrical terminals and two cable glands for 9–13mm cable outside diameter. Electrical installation and pressure adjustment require a suitably qualified person.
The glass-fibre-reinforced polyamide cover encloses a mechanical diaphragm-operated switch. Wetted materials are chromated zinc alloy and fabric-reinforced nitrile rubber.
Telemecanique XMPA12B2144 Specifications
Telemecanique XMP Installation Instructions
