Boots – shoes – and leggings
Patent
1984-11-07
1988-09-27
Lall, Parshotam S.
Boots, shoes, and leggings
7386156, 73296, 250577, 340606, G01F 1245, G01F 2350, G01N 1506
Patent
active
047746769
ABSTRACT:
A linear digital flow meter includes a float in a passageway as is located positioned with the rate of flow. A sight glass tube is secured to the end of the unit and a rod connects the float to a tube. A generally H-shaped housing has the tube located in an opening in the cross bar with a light chamber to one side and a detector chamber to the opposite. A bank of LEDs in the light chamber is aligned with a transmitting slot and a bank of phototransistors is aligned with a receiving slot in the detector chamber. A shadow mask between the phototransistors and the slot concentrate the light so the phototransistor receive light according to the length of rod in the sight glass. A bottom connector chamber is in the bottom of the housing with L-shaped passages to the light and detector chambers with the appropriate leads to the lamp and detector chambers. A multiplexer connects the phototransistors to a microprocessor which stores and processes the signal. The microprocessor has a programmable range selection unit, a limit control unit and an output circuit establishing a voltage output signal unit and a current output signal unit to produce voltage and current signals proportional to the flow rate.
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Payne Kenneth R.
Stenzel Wallace I.
Dixon Joseph L.
Lall Parshotam S.
Waukee Engineering Company
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