CEM Mechanical Pressure Switch

Description

CEM Mechanical Pressure Switches

The Schneider Electric, Square D brand of Pumptrol Pressure Switches provide proven reliability in an easy, simple, compact installation. The universally accepted and recognized design is easy to wire, features drift proof cut-in and cut-out settings, has visible vertical contacts which are easy to inspect. No manufacturer offers a broader line of water pump switches to meet your pumping needs

The Schneider Electric, Square D brand of pressure switches is the most trusted brand in residential, commercial and industrial pumping applications. For over 60 years, Square D pressure switches continue to meet the needs of our customers

Manual on/off switch

The 9013 series offers an optional on/off switch for the pressure switch. This allows you to manually turn on and off your pump system for extended periods of time

Automatic low pressure/water cut-off

If system pressure is lost for any reason, a low water condition for example, the automatic lower pressure/water cut-off feature will open the contacts, turning off the pump

Pulsation plug

Pulsation plugs are available to control pressure, due to increased start up pressure, generated by the high speed jet pump motors or by valves prone to a surge in pressure

Bayonet pressure connector

Expensive shielded electrical cable between the jet pump motor and controller can be eliminated by mounting the pressure switch directly on the jet pump motor and utilizing a barbed bayonet (straight or 90° elbow) fluid connection

Automatic low pressure/water cut-off

If system pressure is lost for any reason, a low water condition for example, the automatic low pressure/water cut-off feature will open the contacts, turning off the pump. The low water cut off functions normally and cycles the pump per your typical demands, however, if the system pressure is lost for any reason, the switch contacts open, turning off the pump

About Pressure switches

A pressure switch is a form of switch that operates an electrical contact when a certain set fluid pressure has been reached on its input. The switch may be designed to make contact either on pressure rise or on pressure fall. Pressure switches are widely used in industry to automatically supervise and control systems that use pressurized fluids

A pressure switch for sensing fluid pressure contains a capsule, bellows, Bourdon tube, diaphragm or piston element that deforms or displaces proportionally to the applied pressure. The resulting motion is applied, either directly or through amplifying levers, to a set of switch contacts. Since pressure may be changing slowly and contacts should operate quickly, some kind of over-center mechanism such as a miniature snap-action switch is used to ensure quick operation of the contacts. One sensitive type of pressure switch uses mercury switches mounted on a Bourdon tube; the shifting weight of the mercury provides a useful over-center characteristic

The pressure switch may be adjustable, by moving the contacts or adjusting tension in a counterbalance spring. Industrial pressure switches may have a calibrated scale and pointer to show the set point of the switch. A pressure switch will have a hysteresis, that is, a differential range around its setpoint, known as the switch’s deadband, inside which small changes of pressure do not influence the state of the contacts. Some types allow adjustment of the differential

The pressure-sensing element of a pressure switch may be arranged to respond to the difference of two pressures. Such switches are useful when the difference is significant, for example, to detect a clogged filter in a water supply system. The switches must be designed to respond only to the difference and not to false-operate for changes in the common mode pressure

The contacts of the pressure switch may be rated a few tenths of an ampere to around 15 amperes, with smaller ratings found on more sensitive switches. Often a pressure switch will operate a relay or other control device, but some types can directly control small electric motors or other loads

Since the internal parts of the switch are exposed to the process fluid, they must be chosen to balance strength and life expectancy against compatibility with process fluids. For example, rubber diaphragms are commonly used in contact with water, but would quickly degrade if used in a system containing mineral oil

Switches designed for use in hazardous areas with flammable gas have enclosure to prevent an arc at the contacts from igniting the surrounding gas. Switch enclosures may also be required to be weatherproof, corrosion resistant, or submersible

An electronic pressure switch incorporates some variety of pressure transducer (strain gauge, capacitive element, or other) and an internal circuit to compare the measured pressure to a set point. Such devices may provide improved repeatability, accuracy and precision over a mechanical switch

About CEM Pumps and Blowers

Established in 1970 C.E.M. elettromeccanica S.r.l. has been a leading manufacturer of electric pumps and DC motors primarily focussed for use in the maritime sector
In the 48 years, we have been making motors and our constant expansion in the national and the international markets have resulted in the broadening of our extensive product range

…highest quality materials…design…innovative production processes…remarkable lifespan…

This makes us the ideal partner for large and medium-sized boat builders of pleasure, fishing and military vessels.

Our extensive range now includes:

• DC and AC electric pumps
• Belt driven pumps, with manual or electromagnetic clutch
• hydraulically driven pumps
• water pressure systems
• centrifugal and axial blowers
• diesel driven pumps
• manual pumps
• DC motors

Our commitment to using the highest quality materials used, the special care invested in the design and in the innovative production processes we adopt, we are able to offer excellent performances and a remarkable lifespan of our products exactly what you need when our product can offer extra hours of safety when in difficulty

The CEM factory is based in Nonantola close to Modena in Italy, and is a family-owned business with generations of experience in the manufacture of pumps, blowers and electric motors

All of our products are built to standards that are in accordance with classification and certification can be obtained from each of the bodies: Bureau Veritas, Det Norske Veritas (DNV), Lloyd’s Register and RINA

NEMA Type 1 indoor enclosure
2 pole, rated 1-1/2HP @ 115 V ac, 2 HP @ 230 V ac (Can also be used for DC power supplies)
Adjustable cut-in/out
Maximum pressure: 220 psig
Diaphragm actuated
UL, CSA Listed
Mechanical life: 100,000 operations