Importance

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Abstract

A gas flowmeter includes an oil-filled tube coupled to the gas flow line and a float lifted by gas flow. An LED lamp transmitter and a photoresistor receiver are coupled to a guard telescoped over the tube. The LED lamp has an integrated concentrating lens to define a concentrated sharp beam passing through a small barrel located in a guard slot for close coupling the light beam to the tube. The photoresistor receiver includes a similar barrel in an opposite slot in accurate alignment with the transmitter barrel. The receiver includes a photoresistor connected in a dividing network to define an input node to a regenerative 'Schmitt' switch which actuates a solid state control relay to indicate a limit position of the float. A mounting plate has a correspondingly mounted light transmitter housing and photoresistor housing. The housings are formed from the same casting. The housings include similar integral clamping tongues located in slots on the opposite sides of the guard. A clamping screw on the plate positively clamps the plate and thereby the transmitter and receiver in an adjusted position on the tube.

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First Claim