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Comparator circuit for automatic analysis apparatus

  • US 3,961,898 A
  • Filed: 01/14/1975
  • Issued: 06/08/1976
  • Est. Priority Date: 01/14/1975
  • Status: Expired due to Term
First Claim
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1. In a continuous-flow fluid analyzer having a colorimeter flow cell and means for conducting fluid segmented by a substance inert to the fluid through the colorimeter flow cell, the improvement comprising:

  • a. sampling and storing circuit means receiving signals from the flow cell;

    b. memory and recording means connected to and receiving signals from said sampling and storing means;

    c. differentiator circuit means connected to said sampling and storing means and to said memory and recording means for limiting voltages received by said memory and recording means;

    d. logic circuit means including interconnected repetitive pulse generating means, counter means, decoder means and flip-flop circuit means connected to said sampling and storing circuit means and said memory and recording circuit means, said differentiating circuit means selectively controlling said flip-flop circuit means, whereby a selected output signal from said colorimeter flow cell is stored in said storing circuit means and compared with succeeding signals from said flow cell during a cycle of repetitive pulses, said flow cell output signals conducted to said memory and recording circuit means selectively when the voltage difference of said succeeding and stored pulses does not exceed limiting voltages set by said differentiator circuit means and said flip-flop circuit means is activated to permit recording of said selected flow cell output signals.

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