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An electric vacuum
pump is used in electric and conventional vehicles to boost the vacuum needed for normal
power brakes operation. The pumps featured here are manufactured specifically for electric
vehicles by MES-DEA Switzerland; the type is 70/6E and 70/6E2. The difference between two types is productivity, size, running current and type of pressure (vacuum) switch. 70/6E and 70/6E2 has very low acoustic noise and vibration levels, and hardly noticed during operation. The vacuum is controlled by integrated control circuitry consisting of vacuum sensor and solid state vacuum switch. The 70/6E has relative pressure switch whereas 70/6E2 has absolute pressure switch. Both types will maintain preset vacuum level cycling on and off on its own between -600mbar (17.7" Hg) and -650 mbar (19.2" Hg), however 70/6E will reduce vacuum level as atmospheric pressure drops (e.g. at high altitudes) so may never shut off. For instance, at he elevation of 4000 feet above sea level, the 70/6E may only be able to produce 15" Hg vacuum so the shutoff threshold of 19.2" HG will never be reached. In contrast, 70/6E2 will always reach 19.2" regardless of the atmospheric pressure. This needs to be considered for your application. The power required is 12...15 volts DC directly supplied to the pump all the time, no external switches needed. The vacuum level and hysteresis are not user adjustable and are set at the factory to restore the standard vacuum level regular vacuum assisted power brakes in conventional vehicles are designed for. These pumps also will easily replace the vacuum source in regular vehicles if their stock vacuum pump or intake system no longer function. The vacuum booster tank will decrease frequency of on and off cycling, but is not necessary for proper operation and will not affect wear or life time of the pump. Without the tank the pump will likely pump down every time the brakes are actuated, but there is no impact on the brake operation. Customized vacuum level settings (within limits shown on the plot below) can be requested and will be ordered from the factory - premium price required. Mating connector included. 1 year warranty. |
