Infusion tube liquid level detection alarm device
A technology for alarm devices and infusion tubes, applied in flow control, non-electric variable control, instruments, etc., can solve problems such as false positives or missed negatives, and detection results are easily interfered by external light, so as to improve reliability and facilitate use simple effect
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[0019] Such as figure 1 As shown, an infusion tube liquid level detection and alarm device of the present invention comprises:
[0020] The detection unit used to detect the change of the liquid level in the infusion tube includes a light source 1 and a light receiver 2; the light source 1 is a light emitting diode, usually with a current limiting resistor; the light receiver is a photosensitive receiving tube, usually with a voltage divider resistor. The light source 1 and the light receiver 2 can be placed on both sides of the infusion tube 7, or on the same side. Both the transmitting circuit and the receiving circuit are connected to the power supply.
[0021] The electronic control unit used to receive the liquid level change detected by the detection unit, transmit and send an alarm signal, consists of a sending single-chip microcomputer 14 connected with the optical receiver, a receiving single-chip microcomputer 20 connected with the sending single-chip microcomputer ...
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