Museum Technology Source KD-3 Proximity Switch - Manual

Museum Technology Source Inc.
KD-3 Proximity Switch
*Turns objects into touch activated switches
*Activates from inches away
*Works through wood, plastic
*Easy setup...self calibrating
*Normally open relay output
*Operates on 9 to 24 Volts DC
*Wide range of sensor sizes
*Output mode: pushbutton, toggle or timed
PRELIMINARY INFORMATION
June 2012
The KD-3 is a capacitive proximity switch that uses a combination
of analog and digital techniques to detect a change of capaci-
tance on a remote sensing plate. The capacitance change is
brought about when the sensing plate is approached or touched.
Upon activation, a normally open relay closes, indicated by a red
LED lighting. Three modes are available: Pushbutton, in which
the relay stays closed for as long as presence is sensed; Pulse,
in which the relay closes for one second and then opens, or
Toggle, where the relay closes on the first touch, remaining
closed until a second touch occurs.
The KD-3 can work with sensing plates of various sizes and
shapes. The sensing plate needs to be of metal, such as copper
or aluminum, although others will also work.. In certain cases the
artifact itself may be used as the sensor, as in the case of a metal
teapot or bowl. In other cases, the sensor may be embedded in
the object, provided that the object is non-metallic. The KD-3 is
normally mounted close to the sensor, with a single wire connect-
ing the two. By use of coaxial cable, this distance may be
extended to several feet.
The sensor size and shape will, to some extent, determine the
distance over which the KD-3 will activate. Although not always
required, internal adjustments are available to optomize the sen-
sitivity and hence operating range. The KD-3 has been tested
with sensor plates as small as one-half inch square, and as large
as 12 by 16 inches.
The Auto-Calibration feature adjusts the KD-3 continuously to the
environment. Such things as dirt, humidity, ice or damage to the
sensor plate are automatically accounted for.
Museum Technology Source Inc.
323 Andover Street Wilmington MA 01887
800-729-6873 | 978-657-3898
fax 978-657-7132
www.museumtech.com
Rev B June 2012