Strain Gauge Amplifier | Signal Conditioner (SGA A&D)

The strain gauge signal conditioning module is a high performance signal conditioner for single or multiple strain gauge bridge sensors such as load, force, pressure and torque. The SGA A/D provides strain gauge signal conditioning for load cells and offers a wide bandwidth and a wide input signal range. The […]

The strain gauge signal conditioning module is a high performance signal conditioner for single or multiple strain gauge bridge sensors such as load, force, pressure and torque.

The SGA A/D provides strain gauge signal conditioning for load cells and offers a wide bandwidth and a wide input signal range. The device can be powered from AC or DC supplies providing excitation for up to four x 350 Ohm strain gauge bridges.

The conditioned output signal can be selected from 0-20mA, 4-20mA, 0-10V, 0-5V, ±5V or ±10V.
Options include: Isolated DC supply, DIN rail mount and OEM module.

Supplied in a waterproof IP65 NEMA4 bulkhead mountable case and is available with AC or DC power supply options. The strain gauge signal conditioning module is robust and fully CE compliant.

For a digital version of the strain gauge signal conditioning module with set point relays, communications and display options please see our Load Cell Amplifier Model LCA15.

  • Strain Gauge Amplifier ideal for load cell signal conditioning
  • Bridge excitation of 10V DC with drive for four 350 Ohm load cells
  • Selectable 1 to 5000 Hz filter for test & measurement applications
  • Selectable sensitivity from 0.1 to 30 mV/V using switches and fine trim potentiometer
  • Switch selectable offset ±70% FS using switches and fine trim potentiometer
  • User selectable analogue output in standard voltage or current format
  • The SGA A/D (shown in main photo) comes complete with case, with option of DIN rail mounted case (D4) as shown on left or as a pcb board of the load cell signal conditioning module
Parameter
  Min Typical Max Units
Power supply (SGA/A):- (110/230Vac) 50 – 60Hz  99/198 110/230 126/253 V AC
Power supply DC :- 18 24 V DC (Note: 1)
Power supply IS12/24 – Isolated 9 36 V DC
Power supply current DC :- (depends on loading) 50 90 200 mA
Bridge excitation 350R Strain Gauge 9.5 10 10.5 V
Bridge resistance 85 Ohms
Bridge sensitivity (Switchable) 0.06 30 mV/V
Gain adjustment (Pot – fine adj.) 0.06 1.0 mV/V (Note: 2)
Offset adjustment (Pot – fine adj.) -1.25 1.25 %FR (FR=Full Range)
Offset adjustment (Switchable – coarse adj) ±1.25 ±79 %FR
Output load (Voltage output) 2 mA
Output load (Current output) 0 500 Ohms
Bandwidth (No filter and > 2mV/V) – 3dB point DC 6 kHz
Filter cut-off (Switchable ranges) – 3dB point 1 5000 Hz
Zero temperature coefficient at 2.5mV/V) 0.002 0.009 %FR/ ºC at 2.5mV/V FR
Span temperature coefficient 0.007 0.01 %FR/ ºC
Linearity 0.03 %FR
Gain stability -1st 1000 Hours 0.2 %FR
Gain stability – 2nd 1000 Hours 0.1 %FR
90 day Offset stability 3.3 uV
Output load stability gain (0 – 100%) 0.01 %FR
Output load stability offset (0 – 100%) 0.01 %FR
Power supply rejection gain (0 – 100%) 0.01 %FR
Power supply rejection offset (0 – 100%) 0.01 %FR
Operating temperature range -10 50 ºC
Storage temperature range -20 70 ºC
Humidity 95 %
Note:1 18V max at full load. Note:2 Depends on sensitivity settings
Output Options Set by On-Board Switch    
±10V, ±5V, 0-10V, 0-5V, 0-20mA, 4-20mA
Connections    
Field screw terminals – 2.5mm² rising clamp
Enclosure    
ABS case 160 x 80 x 55 sealed to IP65 fitted with 3 off cable glands
Controls    
Gain pot, Offset pot, Coarse gain switches, Coarse offset switches, Filter cut-off switches, Output mode switch
Environmental    
CE Environmental Approvals European EMC Directive 2004/108/EC, Low Voltage directive 2006/95/EC

 

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