Abstract: Disclosed are methods and apparatus for monitoring a plurality of grinder pumps, and in particular, remotely over a communications network. Aspects of the invention include an alarm panel having a modular configuration, a modem board which allows use of a single telephone line and use by the homeowner in an emergency, the transmission of data over a high voltage AC line, and recharging of a sensing tube for measuring the level of wastewater in a tank.

Abstract: Disclosed are methods and apparatus for monitoring a plurality of grinder pumps, and in particular, remotely over a communications network. Aspects of the invention include an alarm panel having a modular configuration, a modem board which allows use of a single telephone line and use by the homeowner in an emergency, the transmission of data over a high voltage AC line, and recharging of a sensing tube for measuring the level of wastewater in a tank.

Abstract: An electronic thermometer for use in food and dairy processing is disclosed. The thermometer utilizes a passive trimming circuit in conjunction with high quality Resistive Temperature Devices (RTDs), along with four-wire measurement circuitry to create an extremely accurate signal so that all probes are interchangeable and require no adjustment to maintain accuracy. The current source is modulated to linearize the RTDs response over a broad temperature range. To substantially eliminate the possibility of false temperature readings, dual RTDs and redundant electronic circuitry are employed, along with a detection circuit which will blank out the display should an error be detected. To prevent undue display blanking, a rapid temperature change sensing circuit will temporarily override the display blanking feature.