SGA
Strain Gauge Amplifier
For Load Cells and similar devices
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Highlights
Strain gauge amplifier for signal conditioning of load cells
Bridge excitation of 10V DC with drive for 4 load cells in parallel
- can be set to 5V DC supply too
Selectable bandwidth of 1 to 6,000 Hz 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
Shunt calibration resistor on board for easy system testing
The SGA (shown in main photo) comes complete with case,
with option of DIN rail mounted case (D4) or as PCB, as on left
Features:
Connect up to four 350-ohm transducers in parallel
High Performance
3 Year Manufacturer's Warranty
Sensitivity from 0.1 to 30 mV/V
Simultaneous voltage and current output
Outputs ±10V, ±5V, 0-10V, 0-5V, 0-20mA, 4-20mA
Bandwidth DC to 6kHz
Low pass filter 1Hz to 5kHz
Offset up to ±70% of full scale
Simple calibration
No interaction between Gain and Zero Offset
Simple DIL switch settings - Output Mode/Sensitivity/Filter
Accepts half- and full-bridge transducers
Built-in excitation
Mains† and DC-powered versions available
Mains-powered version can also be run from DC power supply
Robust single-card PCB
Surface mount components
Module option for connecting 1/4- and 1/2- strain gauge bridges
IP65 NEMA4 ABS field case with cable glands
Available cased or as PCB only
Full CE Approval
Saves cost and space
Generous quantity discounts available
Easy to use
Ideal for OEM, R&D, Production, QA, QC applications
The SGA Strain Gauge or Load Cell Amplifier is a high performance signal conditioner for single or multiple strain gauge bridge sensors in parallel (load, force, pressure, torque), offering a wide bandwidth and a wide input signal range. The SGA can be powered from AC or DC supplies providing excitation for up to 4 x 350 ohm strain gauge bridges. The conditioned ouput signal can be selected from 0-20mA, 4-20mA, 0-10V, 0-5V, ±5V or ±10V. Options include isolated DC supply, connector module for half and quarter bridge strain gauges, DIN rail mount and OEM module.
For a digital version with set point relays, communications and display options please see LCA15.
Specification:
Parameter |
Units
|
Minimum
|
Typical
|
Maximum
|
| SGA/A Mains Power Supply Voltage at 50-60Hz |
V AC |
- |
110/230† |
- |
| SGA/D Power Supply Voltage |
V DC |
18 |
- |
24* |
| Power Supply Current SGA/D (depends on loading) |
mA |
50 |
90 |
200 |
| Bridge Excitation with 350R Strain Gauge |
V |
9.5 4.85 |
10 |
10.5§ 5.15§ |
| Bridge Resistance |
Ohms |
85 |
- |
- |
| Bridge Sensitivity (switchable) |
mV/V |
0.06 |
- |
29 |
| Gain Adjustment (pot - fine)‡ |
mV/V |
0.06 |
- |
1.0 |
| Offset Adjustment (pot - fine) |
%FS |
-1.25 |
- |
+1.25 |
| Offset Adjustment (switchable-coarse) |
%FS |
±1.25 |
- |
±79 |
| Output Load (voltage output) |
mA |
- |
- |
2 |
| Output Load (current output) |
Ohms |
0 |
- |
500 |
| Bandwidth (no filter and >2mV/V |
Hz |
DC |
- |
6,000 |
| Filter Cut-off (switchable ranges) |
Hz |
1 |
- |
5,000 |
| Zero Temperature Coefficient (@2.5mV/V) |
µV/°C |
- |
0.5 |
- |
| Span Temperature Coefficient |
%/°C |
- |
0.007 |
0.01 |
| Linearity |
%FS |
- |
0.03 |
- |
| Gain Stability - 1st 1000 hours |
%FS |
- |
0.2 |
- |
| Gain Stability - 2nd 1000 hours |
%FS |
- |
0.1 |
- |
| 90 Day Offset Stability |
µV |
- |
3.3 |
- |
|
Output Load Stability Gain (0-100%) |
%FS |
- |
- |
0.01 |
| Output Load Stability Offset (0-100%) |
%FS |
- | - |
0.01 |
| Power Supply Rejection Gain (0-100%) |
%FS |
- | - |
0.01 |
| Power Supply Rejection Offset (0-100%) |
%FS |
- | - |
0.01 |
| Operating Temperature Range |
°C |
-10 |
- |
50 |
| Storage Temperature Range |
°C |
-20 |
- |
70 |
| Humidity |
% |
- | - |
95 |
| Package: |
ABS case sealed to IP65, with 3 cable glands |
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| Dimensions: |
160mm (6.3") long x 80mm (3.2") wide x 55mm (2.2") deep (not including cable glands) |
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| Output Options: |
±10V, ±5V, 0-10V, 0-5V, 0-20mA, 4-20mA |
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| Controls: |
Gain potentiometer |
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| Environmental Approvals: |
EMC Emissions: |
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Notes: * 18V maximum at full load
‡
Depends on sensitivity settings
§ SW4/8 = "off", bridge supply = 5V DC
§ SW 4/8 = "on", bridge supply = 10V DC
FS = Full Scale
†Note that the SGA/A does not have specific approval to Canadian regulations for mains-powered equipment, although it conforms to EU and US standards. It is recommended that Canadian users consider the SGA/D with a locally-purchased, approved DC power supply.
SGA Strain Gauge Amplifier with Dual Analogue Outputs
SGA with optional DIN Rail Mounts
SGA as a PCB version
SGA-BCM
Bridge Completion Module for connecting 1/2- or 1/4- bridge strain gauge devices.
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