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This electronic sight glass "sees"
into
the refrigerant tubing by means of ultrasonics. Two
sensors are used, one for transmitting
and one for receiving. These sensors
are in the form of clamps, which attach
to any metallic refrigeration tubing.
An audible beeping sound quickens as bubbles
or floodback
are sensed, and a row of LED's light, simulating
bubble movement in the
tubing.
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