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System radio transmission of liquid level data and battery saving technique

  • US 5,111,201 A
  • Filed: 12/26/1989
  • Issued: 05/05/1992
  • Est. Priority Date: 12/26/1988
  • Status: Expired due to Fees
First Claim
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1. System for radio transmission of liquid level data and for converting the received data to liquid volume data to be indicated, comprising;

  • a transmitter comprisinga cell electric source,first means intermittently supplied with electric power from the source to convert liquid level data to corresponding electric signals,second means intermittently supplied with electric power from the source to convert said corresponding electric signals to corresponding frequency signals,modulation means intermittently supplied with electric power from the source to transmit the received frequency signals on carrier waves through an antenna,a computer normally maintained in a standby state,timer means for intermittently providing activation signals to the computer to place it in an activated state at a predetermined interval, andmeans for storing the last liquid level data to be inputted in the computer so that when the computer is activated said first means is actuated to give the electric signals representing the present level data to be inputted in the computer for comparison of the two data, wherein a transmitting period is selected to be longer in case where the last liquid level is higher than the present level and shorter in case where the last liquid level is lower than the present level, and after the transmission is over the last level data are cleared and the new level data are stored in said storing means; and

    a receiver essentially comprisingfirst means for demodulation of the received frequency signals through an antenna,second means for storing data necessary for conversion in advance so as to convert the received liquid level data to liquid volume data,an indicator including the volume data, and wherein the storing means is adapted to set a counter number when detecting that the liquid level is not being raised up by comparison of said two level data so that the set number is decreased by one when the computer is activated to reach zero and then firstly the level signals are transmitted.

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