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Strain gauge signal conditioner SGA

Image SGA

The SGA 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 4 x 350 ohm strain gauge bridges.

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

The Strain Gauge Amplifier (SGA) is supplied in a waterproof IP65 NEMA 4 bulkhead mountable case and is robust and fully CE compliant.

Technical Specifications

  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   36  V DC
Power supply current DC :- (depends on loading) 50  90  200  mA
Bridge excitation (10 V range) 9.75 10  10.25  V
Bridge excitation (5 V range) 4.85 5 5.15 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   ±80 %FR
Output load (Voltage output)     mA
Output load (Current output)   500  Ohms
Bandwidth (No filter and > 2mV/V) - 3dB point DC    6000 Hz
Filter cut-off (Switchable ranges) - 3dB point   5000  Hz
Zero temperature coefficient at 2.5mV/V)   0.002    %FR/ ºC at 2.5mV/V FR
Span temperature coefficient   0.007    %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
Field screw terminals - 2.5mm² rising clamp
ABS case 160 x 80 x 55 sealed to IP67 fitted with 3 off cable glands
Gain pot, Offset pot, Coarse gain switches, Coarse offset switches, Filter cut-off switches, Output mode switch
CE Environmental Approvals European EMC Directive 2004/108/EC, Low Voltage directive 2006/95/EC

Order Info

Options Code
18/24V DC 50-60Hz for connecting up to 4 transducers (min 350R each) in an ABS Case SGA/D
110/230V AC 50-60Hz for connecting up to 4 transducers (min 350R each) in an ABS Case SGA/A
Isolated DC PSU Module for SGA/D IS1224
Retro Fit PCB Bridge Completion Module for the SGA SGABCM
Accessories Code
DIN Rail for SGA cased D4