Re S.p.A. US3
Rev.12/04/11 8/23
Functioning of the device
General
US3 ultrasonic sensor is suitable to read reel diameters: by a simple calibration it is able to convert a
distance measure in a reel diameter measure providing a diameter proportional analogue output.
It is equipped with an analogue setpoint input which makes US3 a strength self-governing regulation
system: you can modify material strength connecting regulated analogue output to a brake and varying the
associated tension. Material strength will not change during reel unwinding because brake command
tension will be reduced according to diameter.
US3 has a second analogue output which varies proportionally to diameter and is not influenced by setpoint
input changes, the output can be used to visualize the diameter on a display.
Two digital outputs allow the control of relays for activating alarms at diameter values which can be set by
the user.
A software filter protects the reading against big changes in distance which are not lasting, for example due
to reels having an irregular shape.
US3 can also function as a distance reader just by using the regulated output inversion.
The RS-485 serial port allows rapid sensor configuration using a Personal Computer (with integrated RS-
485 port or RS-232/RS-485 external converter) and special “US Calibration” software can be downloaded
free of charge from the website www.re-spa.com.
Control panel
LED BAR: for displaying information
about the measurement and facilitating
navigation in the programming menu
LEDs providing useful information about
the instrument status
KEYS for accessing programming
functions
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