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LCA20 Loadcell Amplifier

  • 4 to 20mA and 0 to 10V output
  • Data logging at 13ms to 1hr intervals
  • 10 point linearisation
  • 2 set point option with relay outputs
  • RS232/485 communications option
  • Factory calibration in mV/V
  • RoHS compliant

Specification

Parameter

Value

Unit

Loadcell Input

Bridge Excitation

4.75 (Min) / 5 (Typical) / 5.25 (Max)

Vdc

Loadcell Excitation System

6 wire (4 wire loadcells can be used with links)

Bridge Impedance

35

Ohms

Bridge Sensitivity Range 1

±3.7

mV/V

Bridge Sensitivity Range 2

±7.8

mV/V

Factory Calibration of sensitivity

±0.05

%FS

Offset Temperature Stability (2.5mV/V FS)

±2

ppm/°C

Gain Temperature Stability

±4

ppm/°C

Non-linearity

±10

ppm FR

Internal Resolution

1 Million

Counts/Divisions

Resolution at 10Hz sampling

180,000

Counts/Divisions

Resolution at 80Hz sampling

130,000

Counts/Divisions

Analogue Output

Current Output

4 (Min) / 20 (Max)

mA

Loop resistance

1

Voltage Output

0 (Min) / 10 (Max)

V

Load resistance

5

Bandwidth -3dB

8.5

Hz

Phase Delay – Step Change

26

ms

Phase Delay – Sine Wave

55

ms

Rise and fall time (10 to 90%)

40

ms

Rise and fall time (1 to 99%)

85

ms

Zero stability

0.005 (Typical) / 0.01 (Max)

%FS/°C

Gain stability

0.005 (Typical) / 0.01 (Max)

%FS/°C

Resolution

8,000

Counts/Divisions

Power, Options and Environmental

Option LS1 Power Supply (110Vac)

97 (Min) / 120 (Max)

Vac

Option LS1 Power Supply (230Vac)

210 (Min) / 260 (Max)

Vac

Option LS3 Power Supply

9 (Min) / 32 (Max)

Vdc

Power

3 (Min) / 10 (Max)

W

Option LR1

2 Setpoints with SPCO contacts rated 240Vac at 5A.

Option LC4

Serial communication supporting RS232, RS422 and RS485.

Option LP1

On-board programmer with 4½ digit display.

Option LP2

Remote handheld programmer with 4½ digit display.

Option LTL

Transparent lid.

Option PGM1

Programming cable.

Operating temperature range

-10 (Min) / 50 (Max)

°C

Storage temperature

-20 (Min) / 70 (Max)

°C

Humidity

0 (Min) / 95 (Max)

%RH Non condensing

Protection

IP65

The LCA15 has been redesigned to become the LCA20 taking advantage of new technology to improve performance and increase functionality.

The external appearance and dimensions remain the same as the LCA15.

All set up functions are via either a programming module or a computer depending on the options chosen. There are two types of programming module, one can be mounted on the amplifier board and the other is a separate hand held unit that can be used with more than one amplifier. Free toolkit software is available that can be run on a computer to carry out all the set-up functions and is able to log data from the LCA20. The computer is connected via a PGM1 programming cable or an LC4 communications module. The LC4 module supports RS232, RS422 and RS485 using Mantrabus 1 and 2, Mantra ASCII or Modbus RTU. Data logging intervals can be set at 13ms to 1hr. The logging duration can be set to 99999 readings or 999 hours. The exact limits on the logging function are affected by the sampling rate of the LCA20, the serial port speed and the computer used for logging.

Two analogue outputs are available, 4 to 20mA and 0 to 10V. The current output operates in source mode with the amplifier supplying the loop power. The analogue output is uni-polar so if a bi-directional loadcell is used it is scaled so that the mid point of the analogue output is equal to zero load. This will be 12mA or 5V.

If the LCA20 is supplied with a loadcell it will normally be calibrated to read the loadcell output in the same engineering units as the loadcell calibration. A traceable system certificate will be supplied for the amplifier and loadcell combination. Alternative calibrations are possible; please consult our engineering department to discuss your requirements. The full manual is available for download from our website if you require more detail on any of the items in this data-sheet.

Alternative calibrations are possible; please consult our engineering department to discuss your requirements.

CE - This instrumentation product complies with the requirements of the European EMC directive.

Files

Type

Title

Download

Outline

Outline drawing of the product.

Download

PDF Manual

Printable manual.

Download