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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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Totalizer
for 0-1 mA, 4-20 mAor 0-10V Signals 4-20 mA Current Transmitter
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Scalable for flow rate or total
flow.DIN Rail mounted, digitally programmable
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Click
to Order 4-20 mA Totalizer
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Features
Standard
Main Board |
Isolated
4-20 mA or 0-10V transmitter output, selectable. |
Output
tracks rate or total. |
0-1
mA, 4-20 mA or 0-10V process signal input. |
Output
accuracy maintained for narrow or wide spans. |
Selectable
square root for differential flow.
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5V,
10 V or 15V dc excitation output to power sensors.
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Output
resolution: 0.025% of span (12 bits).
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Output
accuracy: ±0.05%
of span.
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Output
update rate: 25/sec. |
DIN
rail mount package only 22.5 mm thick. |
Detachable
screw clamp plug connectors. |
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Optional
dual solid state relays for alarm or control. |
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Extended
Main Board
All
capabilities of the Standard Main Board, plus:
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| Custom
curve linearization.
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Time based on rate
(1/rate). |
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Description
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Laureate
4-20 mA output, process signal input totalizing
transmitters accept 0-1 mA, 4-20 mA or 0-10V
signals from flow meters and other transducers, such
as watt meters, to track rate or totalized rate.
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With
a Standard Main Board, the transmitter
output can track rate (such as gallons per
minute or watts) or totalized rate (such as
gallons or kilowatt hours) whether the
transducer output is linear or requires square
root extraction (differential pressure flow
transducers).
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With
an Extended Main Board, the transmitter can
also perform custom curve linearization
(provided by a curvilinear spline fit with up to
180 data points), display 1/ rate (such as the
time it takes a conveyor to pass through an
oven), and perform batch control for repetitive
fill operations. Such applications
typically make use of optional dual solid state
relays, which are available as options. External
reset of totals is provided by a special
connector.
The
process transmitters convert the full-scale 0-1 mA,
4-20 mA or 0-10 V analog input signal to a frequency
of 10-110 kHz, which is converted internally to a
6-digit rate reading rate using inverse period
timing, and from there to the analog transmitter
output. The analog output is accurate to ±0.05% of
output span, as determined by an ultra-linear 12-bit
(4096 step) digital-to-analog converter (DAC). The
output update rate is a fast 25/sec. 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. 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.
Transmitter programming is via a
three-terminal RS-232 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).
The transmitters are
housed in a 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 4-20 mA Totalizer
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specifications
Laureate 4-20 mA Transmitters
Analog Input Rate Transmitter & Totalizer
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| Analog
Input |
0-1
mA |
4-20
mA |
0-10
V |
Input
resistance
Max current or voltage |
182
ohms
37 mA |
9
ohms
160 mA |
1
Mohm
600 V |
Input
Resolution
Span Tempco
Zero Tempco
Accuracy at 25°C
Read Rate |
6 digits
±0.0025% R/°C
±0.0005 FS/°C
±0.005% FS ±1 count
25/sec (typical)
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| Analog
Output |
Output
Levels
Compliance, 4-20 mA
Compliance, 0-10V
Output Resolution
Output Accuracy
Output Update Rate
Output Isolation |
4-20
mA and 0-10 Vdc (selectable)
10V ( 0-500 ohm load )
2 mA ( 5 kOhm load )
12 bits (4,096 steps)
±0.05% of output span
25/sec
250V rms working, 2.3 kV rms per 1 minute test |
| 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 |
| 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. |
| 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. |
| Mechanical |
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 |
| Environmental |
Operating
Temperature
Storage Temperature
Relative Humidity |
0°C
to 70°C
-40°C to 85°C
95% at 40°C, non-condensing |
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Click
to Order 4-20 mA Totalizer
Pinout
Laureate 4-20 mA Transmitters Analog Input Rate
Transmitter & Totalizer
DC &
Externally Powered Process Transmitter
Transmitter Powering Two
Sensors |
Click
to Order 4-20 mA Totalizer
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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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