EN
The Pump Units are designed for location in Zone 1 Hazardous areas, ATEX Category 2.
It is recommended that a Local Control Box is positioned in close proximity to the pump, as a convenient local
Start / Stop facility and Junction box.
The main Pump Control Panel must be positioned within an Electrically Safe Area.
Pressure Relief Valve
The Smart Pressure Relief valve is a mechanical solution for the prevention of Smart pump and paint system
overpressure.
The maximum pressure setting the Pressure Switch should be set to is 20 bar [305 psi] and 17 bar [246 psi]
respectively.
If the system goes over pressure, the valves have been designed to bypass material directly back into the pump
inlet, as a result, the wetted components remain wet at all times.
Electrical connections must be in accordance with Local Regulations for installation in Hazardous Areas.
INSTALLATION
The benefit of keeping the wetted components constantly wet;
it does not allow the fluids to dry and affect the performance of the valve.
Pressure Switch (Optional)
A Pressure switch (and/or Pressure relief valve) must be connected to the outlet manifold port and set to stop the
pump (or relieve the fluid pressure) in the event of the system overpressure
e.g. blocked paint filter, otherwise Pump warranty may be invalidated.
This is necessary to protect the Pump mechanics from overload.
An adapter to mount a pressure switch and pressure sensor is available, see accessories.
It is recommended that the switch setting is set to 1 bar [14.5 psi] above the maximum required pressure.
The Pressure Switch is classified as simple apparatus and as such should be electrically connected as part of an
intrinsically safe electrical circuit.
The Pressure Switch should be wired as a Normally Closed contact (fail safe) and be hard wired to stop the motor
on operation, to minimise response time.
IMPORTANT NOTE
The pressure relief valve is a purely mechanical device intended to complement the primary and reccomended
electrical sensor, which must be set at a lower pressure to the valve.
77-3245 R1.0 6/36 www.carlisleft.com
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