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- 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 electronics, 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 control
- Drop in replacement to Kaman's KD-2400 (with
accessories kit)
- Very low switching hysteresis, <1%
on ferrous targets
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Kaman Instrumentation's displacement measuring system Model
KD-2440 is a noncontact 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 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. |
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The signal is half-wave rectified and filtered to obtain an
analogue voltage proportional to the target position or displacement.
The analogue 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. |
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The KD-2440 may be used in a variety of applications
using target materials such as ferrous or stainless steel or
aluminium. 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.
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The KD-2440 system consists of three sub-assemblies:
the sensor, an interconnecting 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). |
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The KD-2440 conforms with the applicable
standards of Council Directive for Generic for Light Industrial
and Commercial Use. Under some EMI environments, at specific
frequencies, the KD-2440 unit may experience a change in output
voltage. In general, when exposed to those environments covered
by the EMC directive, the user can expect less than 5% deviation
of output. As always, contact Kaman Instrumentation for specific
data or for recommended solutions to problems you are having
with the KD-2440. |
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| Target material
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9C sensor measuring
range |
| Non-ferrous (aluminium) |
0-0.175 in. (0-4.45 mm) |
| Non-magnetic steels
(304 stainless) |
0.025 - 0.200 in. (0.64-5.08 mm) |
| Magnetic steels
(4130) |
0.040 - 0.275 in. (1.02- 6.99 mm)
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| Target material
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5CM sensor measuring
range |
| Non-ferrous (aluminium) |
0-0.100 in. (0-2.54 mm) |
| Non-magnetic steels
(304 stainless) |
0.010-0.125 in. (0.254-3.18 mm) |
| Magnetic steels
(4130) |
0.015 - 0.150 in. (0.38-3.81 mm)
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| Electrical |
Environmental |
Input:
Voltage: Regulated 12 Vdc to 24 Vdc
Current: Fuse limit input current from power source
to 11 mA, .28W maximum at full load |
Operating temperature range:
Sensor and cable: 0°F to +400°F (-180C
to +205°C)
Electronics: +32°F to +150°F (0°C
to +66°C) |
Analog output:
Current (full load): 4.2 mA maximum
Impedance: 50 ohms
Voltage: 0-22 Vdc minimum with 24 Vdc input; 0-10
Vdc minimum with 12 Vdc input |
Storage temperature range:
Sensor and cable: -60°F to +400°F (-52°C
to +205°C)
Electronics: -58°F to +212°F (-50°C
to +100°C) |
Switched output:
Load current: 100 mA maximum AC or DC
Load voltage: 30 V r.m.s., 42.4 V peak, or 60 Vdc
On resistance: 30 ohms minimum / 50 ohms maximum
Switch point hysteresis: 0.56 % of full scale for
9C sensor, and 0.97% of full scale for 5CM sensor using
24 Vdc input on 4130 steel |
Thermal drift:
Less than 0.22% per °C of full scale for sensor,
electronics or system. |
| Frequency response: 0-10 KHz (±
3db) |
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| Resolution: Less than .008% of measuring
range using a 5CM sensor on a 4130 steel target at mid
scale, mid gain, and 12 Vdc input |
IP rating:
Sensor: IP67
Electronics: IP40 |
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