• Sensitivity from 0.1 to 30mV/V
  • Voltage or current outputs
  • Zero offset up to 70% of full scale
  • Low pass filter 1Hz to 5kHz
  • 6kHz bandwidth (-3dB)

SGA Loadcell Amplifier

The SGA loadcell amplifier is designed for use with strain gauge loadcells. It provides industry standard current or voltage outputs for accurate interfacing of loadcells with control and monitoring systems. It has a wide gain range with good zero offset capability. Switch set low pass filtering is provided allowing the best compromise between noise and speed to be found for an application. The unit has a stable loadcell supply that can power up to four 350 ohm loadcells connected in parallel.

The amplifier is very flexible allowing a wide range of configurations to be set by switches and terminal wiring. Providing accurate calibration equipment is available it is easy to change the configuration after installation making the SGA an ideal choice for applications that are not fully specified at the start of a project.

Calibration is straight forward using non-interactive zero and span trimmers. When it is purchased with a loadcell the amplifier will be calibrated for use with the loadcell.

110/230Vac mains or 18Vdc powered versions of the SGA are available. The mains powered version can be connected to 110/230Vac and 18Vdc simultaneously to provide protection against mains supply failure.

If the SGA is supplied with a loadcell it will normally be calibrated to read the loadcell output in the same force units as the loadcell calibration. A traceable system certificate will be supplied for the amplifier and loadcell combination.

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

SGA/A and SGA/D Specification

Outputs

Current: 0 to 20mA or 4 to 20mA, loop resistance <500Ω

Voltage: 0 to 5V, 0 to 10V, ±5V or ±10V, maximum current 2mA

Switches and terminal wiring set the output configuration.
Sensitivity Between 0.1 and 30mV/V with a 10V loadcell supply. Set with switches and a potentiometer.
Zero adjustment ±70% of full range. Set with switches and a potentiometer.
Non-linearity - typical ±0.03% of full range
Drift - typical Zero: 0.5μV/°C at the input (2.5mV/V sensitivity)
  Span: 70ppm/°C
Bandwidth 6kHz -3dB, (No filter and >2mV/V sensitivity).
Filter 1Hz to 5kHz -3dB, set with switches.
Loadcell supply 10Vdc at 114mA or 5Vdc at 57mA (4 x 350Ω loadcells). Switch selected.
Operating temperature -10 to +50°C
Case material ABS
Case dimensions H 55mm W 80mm D 160mm
Sealing IP67
Connections Rising clamp terminals, maximum wire size 2.5mm2.
Power Supply SGA/A: 110/230Vac 50-60Hz or 18 to 24Vdc, approximately 5W.
  SGA/D: 18 to 24Vdc, approximately 5W.
The dc supply must be limited to 18V if the loadcell supply is fully loaded.

If the SGA does not have all the functions you require the LCA20 Loadcell Amplifier may be more suitable. An LCA20 data-sheet is available.

CEThese instrumentation products comply with the requirements of the European EMC directive.

Additional Information

PDF data-sheet Printable data-sheet. Right click on the link to download the file.
PDF manual Printable manual. Right click on the link to download the file.

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