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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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Process,
Strain Gauge & Potentiometer Follower Input
4-20 mA Current Transmitter
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Scalable for
process, strain, pressure, level, flow ...
DIN Rail mounted, digitally programmable.
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Click
to Order Strain Gauge & Potentiometer Follower
4-20 mA Transmitter
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Features |
Digital
span adjust from 0 to ±99,999. |
Digital
zero adjust from -99,999 to +99,999. |
0.2,
2, 20, 200, 300V & 600V DC voltage ranges.
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2,
20, 200 mA and 5A DC current ranges. |
All
ranges factory calibrated. |
Peak
value capture and auto-tare. |
Output
accuracy: ±0.01% of full scale input. |
Output
update rate to 60/sec. |
Built-in
5V, 10V or 15V transducer excitation output.
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DIN
rail mount package only 22.5 mm thick. |
Detachable
screw terminal connectors. |
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Optional
dual solid state relays for alarm or control.
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Optional
isolated scalable analog output (4-20 mA or 0-10V).
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Description
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Laureate
4-20 mA output, process input transmitters
provide six DC voltage ranges and four DC current
ranges for use with a wide range of industrial
transducers whose output requires zero and span
adjustment. All ranges are factory calibrated and
jumper selectable. The two most sensitive voltage
ranges, 200 mV and 2V, provide a high input
impedance of 1 Gohm to minimize the load on the
voltage signal
With
Laureate process transmitters as described in this
web page, strain gauges with a 20 mV output can be
internally scaled to display up to 10,000 counts,
while outputs of 200 mV can be scaled to 99,999
counts. With Laureate load cell transmitters, strain
gauges with a 20 mV output can be internally scaled
to the full 99,999 counts.
Laureate
process input transmitters duplicate the performance
and programmable features of their Laureate process
digital panel meter counterparts. Features include
exceptional accuracy at high read rate, and optional
dual solid state relays for local alarm or control.
The transmitters are housed in a DIN rail case that
is only 22.5 mm (0.89") thick. Signal
connections are via detachable screw terminal
connectors.
In
addition to the 4-20 mA output that would typically
be used for signal transmission in an industrial
environment, a 0-10V analog output is selectable.
Either output tracks an internal digital reading,
which is accurate to within ±0.01% of full scale
input and is scalable in software. Output resolution
is set by a 12-bit (4096 step) ultralinear
digital-to-analog converter (DAC). Overall process
transmitter accuracy is set by the DAC to ±0.05% of
output span.
Output isolation from
signal and power grounds is provided by a separate
on-board transmitter power supply, thereby
eliminating potential problems caused by ground
loops. The supply can an drive 20 mA into a 500 ohm
(or lower) load for 10V compliance, or 10V into 5K
ohm (or higher) load for 2 mA compliance.
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).
Laurel's serial output transmitters and meters can
also be part of PC-based data logging systems using
Laurel's Datalogging
Software, which operates under the Laurel
ASCII Protocol. A single software command switches
between the Modbus and Laurel ASCII Protocols.
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Click
to Order Strain Gauge & Potentiometer Follower
4-20 mA
Transmitter
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General Specifications- Modbus Laureate Transmitters
(Click on links in previous section
for details by signal type) |
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Analog Input |
Range |
Input Ohms |
Voltage
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200.00 mV
2.0000 V
20.000 V
200.00 V
600.0 V |
1 Gohm
1 Gohm
1 Mohm
1 Mohm
1 Mohm |
Current
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2.0000 mA
20.000 mA,
200.00 mA
5.000 A |
100 ohms
10 ohms
1 ohm
0.01 ohm |
| Input
Resolution
Input Accuracy
Output Update Rate, Max
Max applied voltage
Over-current protection |
16
bits (65,536 steps)
±0.01% of full scale input (determined by ADC).
50/sec at 50 Hz, 60/sec at 60 Hz.
600 Vac for 20, 200 & 600 V ranges, 125 Vac other
ranges.
25x for 2 mA, 8x for 20 mA, 2.5x for 200 mA, 1x for
5 A. |
| 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) |
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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) |
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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 |
| Power
Input |
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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. |
| 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 terminal connectors. |
| Environmental |
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Operating
Temperature
Storage Temperature.
Relative Humidity |
0°C
to 70°C.
-40°C to 85°C.
95% at 40°C, non-condensing. |
Click
to Order Strain Gauge & Potentiometer Follower
4-20 mA
Transmitter
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Pinout
Process, Strain Gauge & Potentiometer
Follower Input
(shown with optional analog output and dual
relay output) |
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Strain Gauge Transmitter
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Externally
Powered 4-Wire Process Transmitter
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2-Wire
Process Transmitter
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Application
Examples
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| Potentiometer
Application |
In
potentiometric (or potentiometer follower)
applications, the signal from a sliding
contact voltage divider can be converted
to engineering units such as position,
level or percentage. By operating in
a ratiometric mode, the transmitter
will remove any effects caused by variations
in the excitation supply.
For
use with a 1 kohm potentiometer, the
recommended applied excitation voltage
is 10V, and a 2 kohm resistor should
be placed in series with the excitation
output and excitation return leads.
This will allow the transmitter's 2V
scale with a high input impedance of
1 Gohm to be used.
Custom
curve linearization
A
Laureate process transmitter with the
Extended main board option allows exceptionally
accurate custom curve linearization.
For setup, up to 180 data points can
be entered into a spreadsheet. The system
then creates multiple non-linear spline-fit
segments, which provide much better
accuracy than linear segments.
One application, as illustrated,
is the readout of volume of irregularly
shaped tanks based on measured liquid
level or pressure. Altimeters and thermistors
are further applications.
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Click
to Order Strain Gauge & Potentiometer Follower
4-20 mA
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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