• 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

LCA20 Loadcell Amplifier

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.

This digitiser can be used with any of our loadcells. Details of our loadcell families can be found in the Product Guide.

LCA20 Specification

Description Min Typical Max Units
Loadcell Input
Bridge Excitation 4.75 5 5.25 Vdc
Loadcell Excitation System 6 wire (4 wire loadcells can be used with links)
Bridge Impedance 35     Ohms
Bridge Sensitivity Range 1     ±3.7  
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   20 mA
Loop resistance     1
Voltage Output 0   10 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 0.01 %FS/°C
Gain stability   0.005 0.01 %FS/°C
Resolution   8,000   Counts/Divisions
Power, Options and Environmental
Option LS1 Power Supply (110Vac) 97   120 Vac
Option LS1 Power Supply (230Vac) 210   260 Vac
Option LS3 Power Supply 9   32 Vdc
Power 3   10 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   50 °C
Storage temperature -20   70 °C
Humidity 0   95 %RH Non condensing
Protection IP65  

Additional Information

Outline Outline drawing of the product.
PDF data-sheet Printable data-sheet. Right click on the link to download the file.
PDF manual Printable manual for the LCA20. Right click on the link to download the file.