Give Your load cell a serial port

    Contents: Features
Input/output & accessories
Benefits
Specification
Software
Evaluation kit
 

SGA232 and SGA485 Digital Signal Conditioners

Digital load cell signal conditioners

The SGA232 and SGA485 are high performance digital signal conditioners with features for the precision measurement of strain gauge transducers. The card style units are designed to be mounted along side the majority of sensors, providing a 'digital’ load cell with the benefit of very high stability and a RS485 or RS232 output.

Outstanding measurement performance can be achieved (500,000 divisions), and SGA232/485 provides added features of self diagnostics, automatic compensation for temperature and linearity, and automatic calibration.

Features

  • Outstanding performance to cost ratio
  • 24 bit internal resolution
  • Use with low cost 4 core cable, up to 1000m in length
  • Automatic compensation and calibration for temperature, linearization and site specific calibration details
  • Simple to use support software
  • Dimensions 20 x 87.4 x 8.5(depth)mm

Technical features
  • Baud Rates to 230,400
  • High Speed to 500 Readings/Sec
  • ±15KV ESD protected
  • Real mV/V calibration
  • Extreme Noise Immunity 5 x heavy industrial level
  • Transducer Calibration
  • Remote Shunt Calibration
  • Diagnostics LED
  • Very High Stability (Capable of 6000 Divisions OIML)
  • Peak and Trough Recording
  • Programmable Dynamic Filter 
  • Wide operating Voltage (5.4V - 18V)
  • DC Excitation for longer cable lengths
  • Diagnostics LED

Inputs

  • Nominal 2.5mV/V for a 350R bridge. SOT resistor can be used to change mV/V input

Outputs

  • RS232 or RS485 with a choice of protocols - Binary code, ASCII, Modbus or CANopen
  • High resolution output - 500,000 divisions

Options & Accessories

  • Evaluation kit PCB with all connectors, cables, SGA-TEMP and Instrument explorer software
  • DSJ1 IP67 Junction Box-single SGA232/485
  • DSJ4 IP67 Junction Box for 4 pcs SGA232/485 
  • 133 x 72mm Junction PCB 

The benefits to the transducer user/system supplier
Consider  the following points which demonstrates how strain gauge transducers users will benefit

  • Plug-in-and-go-sensor
    No need for a separate instrument, DSC provides a direct output in engineering units from a standard Strain Gauge, - save cost and space.

  •  Simple to use
    The Strain Gauge manufacturer can supply the sensor pre-calibrated for system offset, gain, hysteresis and scale parameters.

  • Outstanding performance to cost ratio
    19 bit (500,000 divisions) and 0.001% noise immunity ideal for high precision process weighing applications such as batching, at a fraction
    of the cost of many instrument solutions

  •  Low cost of Strain Gauge ownership
    Use with low cost 2 pair twisted cabling - reduce set-up costs.
    • Digital storage of calibration details, means the system will not need regular re-calibration - save maintenance costs.
    • In-service replacement of a faulty/damaged Strain Gauge is possible by simply down loading the stored calibration details to a new cell.
    Save maintenance time and cost by not having to empty a vessel and re-apply test weights.

  •  Universal systems compatibility
    Fieldbus connectivity ensures interoperability with existing/future process control equipment

  •  Non-expert maintenance
    Self diagnostics alerts user to common Strain Gauge faults such as over-range.

 

Specification

High Precision types
(SGA232 / SGA485)		 Standard types
(SGA232S / SGA485S)

Description 

MIN 

TYP 

MAX 

MIN 

TYP 

MAX 

UNITS 
Bridge Excitation  4.5  5  5.25  4.5  5  5.25  VDC 
Bridge Impedance  320  350  5000  320  350  5000  Ohms 
Bridge Sensitivity  -3   + 3  - 3    + 3  mV/V 
Offset Temperature Stability    1 4    5 10  ppm/C
Gain Temperature Stability    3 5    30 50 ppm/C
Offset Stability with Time    0.002  0.008    0.0035  0.016  %FR   
Gain Stability with Time  30 300  ppm of FR /1stYear 
Non Linearity   0.0005 0.0025   0.0005 0.0025 % FR
Internal Resolution   16 Million     16 Million   Counts/Divisions
Resolution @ 1Hz (Noise Stable)      400,000     100,000   Counts/Divisions
Resolution @ 10Hz (Noise Stable)      120,000     40,000   Counts/Divisions
Resolution @ 100Hz (Noise Stable)      50,000     10,000   Counts/Divisions
Resolution @ 500Hz (Noise Stable)      18,000     5,000   Counts/Divisions
Optional temperature sensor 
(type SGA-TEMP) 		           
Temperature Measurement Resolution   0,1     0.1   ºC
Temperature Measurement Accuracy   1     1   ºC

 

Software tools for SGA232 & SGA485

Instrument explorer

Use the FREE download of Instrument Explorer to test your communication ports and wiring and to program and configure SGA232 and SGS485.  More . . . 
  Download Instrument explorer  HERE (15 MB)

DLL-file driver

Use the FREE download of DLL-driver to allow your applications to talk to SGA232 and SGS485. Program examples with source code provided in Visual Basic, Delphi and C++ Builder.  Download DLL-driver HERE (500 KB)

 

Evaluation tools for SGA232 & SGA485

Evaluation kit

Evaluation kit PCB with all connectors, cables, SGA-TEMP and Instrument explorer software.  More . . . .