Profile: Electronic Sensors, Inc. offers intrinsically safe wireless tank monitoring systems. The Model 9035A Tank Monitor II is a full feature, programmable liquid inventory monitoring and controlling system. It has a variety of input and output capabilities. It is ideal for those single tank applications needing a local display and/or remote monitoring capability via the optional modem. Pump control and high/low level alarms are also features of the Tank Monitor II. The Level Devil 9143 Diver is a integrated pressure gauge and modem. It reports the level of a single liquid storage tank. It is housed in a tubular shaped housing allowing the unit to be lowered through a tank's top opening to rest on the bottom. The phone cable is enclosed in a plastic tube for protection and it provides a vent to the atmosphere for the low pressure side of the integrated differential pressure gauge. Electrical power used to operate the Diver is obtained from the phone line connection. The Diver is a very low powered device (it sleeps a lot) and can run for hours with energy stored in its energy storing capacitor. No batteries are used and it recharges every time it communicates.