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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 Modbus
or Laurel ASCII Protocol Serial I/O Transmitter
Scalable for process, strain, pressure, level, flow DIN
Rail mounted, digitally programmable.
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DIN
Rail mounted, digitally programmable.
Exceptional accuracy at high update rates.
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Click
to Order Strain Gauge & Potentiometer Follower I/O
Transmitter
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Features |
Selectable Modbus or Laurel ASCII protocol. |
Modbus
RTU or ASCII modes, 2-wire connection, up to 247 digital
addresses. |
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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DC Ranges. Laureate TM Series, DC input
transmitters provide six voltage ranges and four
current ranges, all factory calibrated and jumper
selectable. The 200.00 mV and 2.0000 V ranges provide
a high input impedance of 1 Gohm to minimize the
load on the voltage signal. A 5.000A range measures
the IR drop across a built-in 10 mW current shunt.
The transmitters can also easily be scaled in software
for use with external shunts.
Serial
Data Output. Laureate TM Series transmitters
send data as a serial digital signal. RS485 or RS232
signal levels are jumper selectable and can each
be associated with either the Modbus protocol or
Laurel’s simpler Custom ASCII protocol.
- Modbus protocol
operation is fully compliant with the Modbus
Over Serial Line Specification V1.0 (2002) for
2-wire, half-duplex connection. This includes
RTU or ASCII modes, addressing of up to 32 devices
per RS485 line without a repeater, and up to
247 digital addresses. Modbus operation allows
devices by different manufacturers to be connected
in parallel and be addressed using the same
protocol.
- Laurel’s Laurel
ASCII protocol allows up to 31 Laureate
devices to be addressed on the same RS485 data
line. It is simpler than the Modbus protocol
and is recommended when all devices are Laureates.
It also allows use of Laurel’s datalogging software.
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.
Transmitter
options include dual solid state relays for
local alarm or control and an isolated 4-20 mA or
10V (selectable) analog output, effectively providing
a linearized analog transmitter output that tracks
the reading that would be transmitted digitally.
The analog output provides 12-bit (4096 step) resolution
of the output span and is ultra-linear to within
one bit. Its accuracy is ±0.05% of span for all
signal types, except for AC rms, where accuracy
is ±0.1%. Output isolation from signal and power
grounds is provided by a separate on-board power
supply, which can drive 20 mA into a 500 ohm load
for 10V compliance. Output isolation eliminates
problems caused by ground loops.
DIN
Rail Mounting. Laureate transmitters are housed
in a 35 mm DIN rail case that is only 22.5 mm (0.89")
thick. Signal connections are via detachable screw
clamp plug connectors. |
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Click
to Order Strain Gauge & Potentiometer Follower I/O
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 |
Resolution |
Input Ohms |
Voltage
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200.00 mV
2.0000 V
20.000 V
200.00 V
600.0 V |
10 µV
100 µV
1 mV
10 mV
100 mV |
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 |
0.1 µA
1 µA
10 µA
1 mA |
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. |
| Serial
I/O (standard) |
| Signal
levels
Data Rates
Output Isolation
Serial Protocols
Devices on RS-485 Line
Modbus Addresses
Modbus Modes
Modbus Compliance |
RS485
(default) or RS232 (jumper selectable)
300, 600, 1200, 2400, 4800, 9600, 19200 baud
250V rms working, 2.3 kV rms per 1 min test.
Modbus RTU, Modbus ASCII, Laurel ASCII (selectable)
32 max without a repeater.
247 max
RTU or ASCII, 2-wire.
Modbus over Serial Line Specification V1.0 (2002). |
| 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 I/O
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 I/O
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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