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Non
Contact Proximity Measuring System Kaman KD-2440
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 Kaman
Instrumentation ’s displacement measuring system
Model KD-2440 is a Non Contact Proximity Measuring System.
This low-cost, easy-to-use system makes precision static
and dynamic measurements of metal targets, and thickness
measurements
of nonconductive material backed by metal. Its switching
output will track RPM measurement to 10 KHz.
The KD-2440 Non Contact Proximity Measuring System consists
of three sub-assemblies: the sensor, with integral cable,
a power and output cable, and the signal conditioning
or electronics module. The KD-2440 electronics use a standard
DB-9 connector to bring +12 Vdc to +24 Vdc into the electronics
and provide outputs for the variable voltage and switch
functions. Kaman offers either the P-3410 or P-3450 power
supplies. The system comes standard with one of two production
sensor configurations — the 9C or the 5CM..Both of
these sensors are rated to moderate temperatures and can
withstand temperatures to 400 °F (205 °C).
The KD-2440 Non Contact Proximity Measuring System may
be used in a variety of applications using target materials
such as ferrous or stainless steel or aluminum. Good sensitivity
to small diameter targets lends itself to applications
such as gear teeth counting or RPM measurement. The opto-isolated
switched output makes the KD-2440 ideal for interfacing
to PLC inputs, counters, timers or alarm circuits.
The KD-2440 Non Contact Proximity Measuring System operates
on a traditional Colpitts oscillator circuit where the
sensor acts as the resonating coil for the oscillator.
The proximity of the target to the sensor face pulls the
oscillator, changing its frequency and amplitude of modulation,
and controlling a variable gain oscillator section within
the electronic circuit.
The signal is half-wave rectified and filtered to obtain
an analog voltage proportional to the target position
or displacement.The analog voltage output can be varied
by adjustment of the gain. The input power is diode protected
and regulated to provide a
clean low-noise signal. The output is short-circuit current
protected.
Features:
• Outstanding precision: static resolution to 12 microinches
• Easy to calibrate
• Low cost
• Excellent performance with ferrous targets
• Variable voltage input from 12 to 24 volts DC
• Compact rugged electronic, sensors
• Adjustable gain for up to 22 volts output (with 24 VDC
input)
• Temperature tolerant sensors (to 400°F)
• Level adjustable switched output to 10 kHz for process
controls
• Drop in replacement to Kaman's KD-2400 (with accessories
kit)
• Very low switching hysteresis <1% on ferrous targets
KD-2440 Non Contact Proximity
Measuring System
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