A plurality of probes for sensing their fluid environment are electrically connected to a controller. The controller includes an alarm transducer, relays, a keyboard, and a display connected to a microprocessor and associated memories. Under keyboard control and software direction the microprocessor...http://www.google.com.hk/patents/US4736193?utm_source=gb-gplus-share專利 US4736193 - Programmable fluid detector
