The
SGA
Strain Gauge Amplifier
is a flexible, reliable and cost-effective instrument for conditioning
the signals from your strain gauge based transducers (including half-bridges),
producing two stable analogue outputs (current and voltage) in user-selectable
formats.You can configure the SGA to accept most strain gauged
transducers, reducing the need to stock several different amplifiers.
Models
are available for operation from a mains power supply (SGA/A)†
or from DC (SGA/D). The SGA has an adjustable low-pass filter, and allows
simultaneous voltage and current outputs. A version is available for
conditioning LVDT
transducer signals, too.
Key
features of the SGA:
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
IP65
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
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
|
10
|
10.5
|
| 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
|
| Dimensions: |
160mm
(6.3") long x 80mm (3.2") wide x 55mm (2.2")
deep (not including cable glands)
|
| Output
Options: |
±10V,
±5V, 0-10V, 0-5V, 0-20mA, 4-20mA
|
| Controls: |
Gain
potentiometer
Offset potentiometer
Coarse gain switches
Coarse offset switches
Filter cut-off switches
Output mode switch
|
| Environmental
Approvals: |
EMC
Emissions
EN 50 081-1 :1992 (Light Industrial)
EN 50 081-2 :1992 (Heavy Industrial)
EMC Immunity
EN 50 082-1 :1992 (Light Industrial)
(RF Field Test 100 ppm of reading over 30 to 500MHz)
EN 50 082-2 :1992 (Heavy Industrial)
(RF Field Test 500 ppm of reading over 30 to 500MHz)
Low Voltage Directive: IEC 1010, EN 61010
|
*NB:
18V maximum at full load
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.
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