Laurel

Totalizer for 0-1 mA, 4-20 mAor 0-10V Signals 4-20 mA Current Transmitter

(Scalable for flow rate or total flow.DIN Rail mounted, digitally programmable)
Features
Standard Main Board
  • Isolated 4-20 mA or 0-10V transmitter output, selectable.
  • 0-1 mA, 4-20 mA or 0-10V process signal input.
  • Selectable square root for differential flow.
  • Output resolution: 0.025% of span (12 bits).
  • Output update rate: 25/sec.
  • Detachable screw clamp plug connectors.
  • Optional dual solid state relays for alarm or control.
  • Output tracks rate or total.
  • Output accuracy maintained for narrow or wide spans.
  • 5V, 10 V or 15V dc excitation output to power sensors.
  • Output accuracy: ±0.05% of span.
  • DIN rail mount package only 22.5 mm thick.
  • Easy setup using Laurel's PC-based Instrument Setup Software.
Extended Main Board
All capabilities of the Standard Main Board, plus:
  • Custom curve linearization.
  • Time based on rate (1/rate).
Description
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.

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).

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.

Specifications

Analog Input 0-1 mA 4-20 mA 0-10 V
Input resistance 182 ohms 9 ohms 1 Mohm
Max current or voltage 37 mA 160 mA 600 V
Input Resolution 6 digits
Span Tempco ±0.0025% R/°C
Zero Tempco ±0.0005 FS/°C
Accuracy at 25°C ±0.005% FS ±1 count
Read Rate 25/sec (typical)
Analog Output
Output Levels 4-20 mA and  0-10 Vdc (selectable)
Compliance, 4-20 mA 10V ( 0-500 ohm load )
Compliance, 0-10V 2 mA ( 5 kOhm load )
Output Resolution 12 bits (4,096 steps)
Output Accuracy ±0.05% of output span
Output Update Rate 25/sec
Output Isolation 250V rms working, 2.3 kV rms per 1 minute test
Transducer Excitation Output (standard)
Jumper Selection 1 10V @ 60 mA, isolated to 50V from signal ground
Jumper Selection 2 5V @ 50 mA, isolated to 50V from signal ground
Jumper Selection 3 15V @ 60 mA, non-isolated
Dual Relay Output (optional)
Relay Type Two solid state relays, SPST, normally open, Form A
Load rating 120 mA at 130 Vac or 170 Vdc, 28 ohms series resistance.
Power Input
Standard power 95-240V AC ±10% or 90-300V DC
Low power option 12-30V AC or 10-48V DC
Frequency DC or 47-63 Hz
Power Isolation 250V rms working, 2.3 kV rms per 1 min test.
Mechanical
Case Dimensions 120 x 101 x 22.5 mm
Case Mounting 35 mm rail per DIN EN 50022
Electrical Connections Detachable screw clamp plug connectors
Environmental
Operating Temperature 0°C to 70°C
Storage Temperature -40°C to 85°C
Relative Humidity 95% at 40°C, non-condensing
Pinout Laureate 4-20 mA Transmitters Analog Input Rate Transmitter & Totalizer Generators
DC & Externally Powered Process Transmitter
Transmitter Powering Two Sensors
Purchase
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5672 Bolsa Avenue Huntington Beach, CA 92649 - USA - Ph (714) 622-2000 - Fax (714) 622-2001