Abstract: A filter monitor system is provided in a bottled water cooler for automatically tracking a filter service interval, and for indicating that filter cleaning or replacement is required for continued efficient cooler operation. In the preferred form, the water cooler includes a thermoelectric chiller module for chilling at least a portion of water contained within a cooler reservoir. An air filter is mounted on a filter frame which is removably positioned for filtering air drawn by a fan to circulate over a heat sink associated with the thermoelectric chiller module. The filter monitor system includes a reset switch engaged by the filter frame to initiate and track a predetermined filter service time interval, such as thirty days, and to energize a signal such as an indicator light at the conclusion of this service interval to indicate that the air filter should be removed for cleaning or replacement.

Abstract: A filter monitor system is provided in a bottled water cooler for automatically tracking a filter service interval, and for indicating that filter cleaning or replacement is required for continued efficient cooler operation. In the preferred form, the water cooler includes a thermoelectric chiller module for chilling at least a portion of water contained within a cooler reservoir. An air filter is mounted on a filter frame which is removably positioned for filtering air drawn by a fan to circulate over a heat sink associated with the thermoelectric chiller module. The filter monitor system includes a reset switch engaged by the filter frame to initiate and track a predetermined filter service time interval, such as thirty days, and to energize a signal such as an indicator light at the conclusion of this service interval to indicate that the air filter should be removed for cleaning or replacement.

Abstract: An electrohydraulic servovalve including a tailoring circuit coupled to provide a predetermined input signal to the motor of the valve. The predetermined signal functions to control the flow of fluid from the valve to effect a desired result. The electrohydraulic servovalve includes a housing defining round flow ports with a spool valve for metering flow through the ports. The spool valve substantially overlaps the round flow ports. The tailoring circuit includes a plurality of amplifiers each of which has a different gain. A command signal is applied to the amplifier and the output from the amplifiers is summed to provide an input signal to the motor of the electrohydraulic servovalve.