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Laurel Electronics
provides digital panel meters / controllers, totalizers, counters,
loop-powered meters, temperature meters, for all types of
transducers or process indication & control. |
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Quadrature
Position or Rate 4-20
mA Current Transmitter
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Transmits
accurate position or rate from quadrature encoders.
DIN Rail mounted, digitally programmable.
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Click
to Order Quadrature Position or Rate Transmitter
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Features |
| Isolated
4-20 mA or 0-10V transmitter outputs, selectable.
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Optional
dual solid state relays for alarm or control.
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| Programmable
for position, angle or rate.
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Accepts
low-level differential or single-ended 5 V logic level
outputs from shaft encoders.
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| Quadrature
count x1, x2 or x4.
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Combined
pulse rate to 250 kHz.
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| Display
refresh rate up to 25/s.
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Zero
channel input.
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| 5V, 10V or 15V dc excitation output.
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DIN
rail mount package only 22.5 mm thick.
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| Detachable
screw clamp plug connectors.
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Easy
setup using Laurel's PC-based Instrument
Setup Software.
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| Description
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Position,
Length or Angle Measurement
Laureate
4-20 mA quadrature transmitters
accept the A & B
signals from shaft encoders to provide a highly accurate
reading of position, length, angle, or rate. The A & B
quadrature signals are 90º out of phase, and their phase
relationship determines whether up counts (+) or down counts
(-) are produced.
One,
two or four transitions
may
be counted at a maximum combined rate of 250 kHz and be
scaled internally from -999,999 to +999,999. counts. The
input circuitry which may be jumpered for either
single-ended input signals or for balanced line driver
signals. Anti-jitter circuitry eliminates errors produced by
vibration of the encoder. In the event of a power failure,
the current total may be stored in non-volatile memory and
can be used as the starting point for counting when power
resumes. Power fail or zero index capabilities are alternate
meter setup choices.
 A
zero index pulse,
if available, is interpreted by
the transmitter as corresponding to an integral number of
revolutions of the shaft encoder. It is used by the
transmitter to correct for any cumulative pulse count
errors. Special circuitry corrects for width of the zero
index pulse.
A built-in
isolated 5V, 10V or 15V dc excitation supply is available to
power shaft encoders and eliminate the need for an external
power supply.
Available
for Totals or Rate
- With the Standard main
board,
the transmitter totalizes the counts and then
scales the total in software for display and control. A
zero index signal can be added as a third input to the A
& B signals.
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With the Extended main
board,
the transmitter can can also output an analog
signal that tracks scaled rate. For example, the output
can track the speed of a moving slab or RPM of a roller.
The output update rate for position or rate is normally
set to a maximum of 25/sec, as determined by a
user-programmable gate time.
Exceptional
Accuracy and Stability
The
4-20 mA analog output is generated by an ultra-linear
12-bit (4096 step) digital-to-analog convert (DAC) whose
output span can be adjusted from 0 to ±999,999 internal
counts and zero can be adjusted from -999,999 to +999,999
internal counts. The analog output has a rated accuracy of
±0.05% of output span.
Transmitter
programming
is via the unit's three-terminal serial port
using Laurel's PC-based Instrument
Setup Software. This software can be downloaded from
this website at no charge. The required transmitter-to-PC
interface cable is available from Laurel (P/N CBL03).
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Click
to Order Quadrature Position or Rate Transmitter
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Specifications
Laureate Serial I/O
Transmitter, Quadrature Input
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Quadrature Inputs
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Type
Transitions Monitored
Max Pulse Rate
Internal Counts
Position Error |
Differential or single-ended
quadrature
x1, x2 or x4
250 kHz at x1, 125 kHz at x2, 62.5 kHz at x4
-999999 to +999999
No error contributed by transmitter |
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Quadrature Position Mode |
Zero Adjust
Span Adjuste |
-999999 to +999999
0 to ±999999 |
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Quadrature Rate Mode |
Conversion Technique
Output Update Rate
Gate time
Time Before Zero Output
Time Base Accuracy
Zero Adjust
Span Adjust |
Inverse period
30 ms + 0-2 signal periods
Selectable 10 ms to 199.99 s
Selectable 10 ms to 199.99 s
Calibrated to ±2 ppm
-999999 to +999999
0 to ±999999 |
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Transducer Excitation Output
(standard) |
Jumper Selection 1
Jumper Selection 2
Jumper Selection 3 |
10V @ 60 mA, isolated to 50V from signal ground
5V @ 50 mA, isolated to 50V from signal ground
15V @ 60 mA, non-isolated |
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Dual Relay Output
(optional) |
Relay Type
Load rating |
Two solid state relays, SPST, normally open,
Form A
120 mA at 130 Vac or 170 Vdc, 28 ohms series resistance |
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Analog Output
(optional) |
Output Levels
Compliance, 4-20 mA
Compliance, 0-10V
Output Resolution
Output Accuracy
Output Isolation |
0-20 mA, 4-20 mA or 0-10 Vdc (selectable)
10V ( 0-500 ohm load )
2 mA ( 5 kOhm load )
12 bits (4,096 steps)
±0.05% of output span
250V rms working, 2.3 kV rms per 1 minute test |
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Power Input |
Standard power
Low power option
Frequency
Power Isolation |
95-240V AC ±10% or 90-300V DC
12-30V AC or 10-48V DC
DC or 47-63 Hz
250V rms working, 2.3 kV rms per 1 min test. |
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Mechanical |
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Case Dimensions
Case Mounting
Electrical Connections |
120 x 101 x 22.5 mm
35 mm rail per DIN EN 50022
Detachable screw clamp plug connectors |
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Environmental |
Operating Temperature
Storage Temperature
Relative Humidity |
0°C to 70°C
-40°C to 85°C
95% at 40°C, non-condensing |
| Application
Examples |
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Using
Quadrature for Cutting to Length
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Controlling
the repetitive cutting of material to length is
an excellent application of the Laureate
quadrature transmitter.
The
quadrature encoder shares the shaft of a sensing
wheel, whose rotation corresponds to lineal
displacement of material. The transmitter
compares the displacement reading against
setpoint information, and then uses its dual
relays to first slow down and then cut the
material.
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Using
Quadrature for X-Y Positioning
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Accurate
X-Y position or rate can be obtained from two
shaft encoders, which convert linear position to
quadrature signals as a shaft turns. In addition
to serving as a transmitter, each Laureate can
use its optional dual relay setpoint capability
for closed loop control.
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Using
Quadrature to Monitor a Drilling Operation
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Quadrature
can be used to track position and vertical
drilling speed of the bit in an oil drilling
operation. A shaft encoder is rotated by a cable
that moves with the drilling shaft. In this
application, the same encoder signal is applied
to a Laureate quadrature transmitter for
position, and to a second quadrature transmitter
for rate. Both transmitters can send a 4-20 mA
signal to a control room and be alarmed.
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Click
to Order Quadrature Position or Rate Transmitter
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Pinout
Laureate Serial
Output Transmitter, Quadrature Input
(shown with optional
analog output and dual relay output) |
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Quadrature
Transmitter with Differential or
Complementary Inputs
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Click
to Order Quadrature Position or Rate Transmitter
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FLW,
Inc - 3505
Cadillac Ave - Bldg E - Costa Mesa, CA. - 92626 - USA - Ph (714) 751 -
7512 - Fax (714) 751 - 0213
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