Strain Gauge Signal Conditioning for Load Cells (SGA A&D)
- Strain gauge amplifier ideal for load cell signal conditioning
- Bridge excitation of 10 V DC with drive for four 350 Ohm load cells
- Conditioned output signal can be selected from 0-20 mA, 4-20 mA, 0-10 V, 0-5 V, ±5 V or ±10 V
- 1 - 5 kHz adjusted 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
Completion Module Bridge available (SGABCM)
- For half or quarter Bridge Connection on (SGABCM)
- Provides local and remote shunt calibration
- Supports half and quarter bridges
- High stability resistors
- Compatible with all variants of the SGA A/D
- Easy installation
The strain gauge amplifier 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 0-20 mA, 4-20 mA, 0-10 V, 0-5 V, ±5 V or ±10 V.
Options include: Isolated DC supply and DIN rail mount.
Supplied in a waterproof IP67 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 display for weighing LCA20.
For further information on strain gauge signal conditioning for load cells see ‘What is a Signal Conditioner?'
| 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 (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) | 2 | mA | ||
| Output load (Current output) | 0 | 500 | Ohms | |
| Bandwidth (No filter and > 2mV/V) - 3dB point | DC | 6000 | Hz | |
| Filter cut-off (Switchable ranges) - 3dB point | 1 | 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 | ||||
| Connections | ||||
| Field screw terminals - 2.5mm² rising clamp | ||||
| Enclosure | ||||
| ABS case 160 x 80 x 55 sealed to IP67 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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Documents
Software
No relevant software available
Product order options
Please read the following before selecting the options for this product:
SGA/A & SGA/D strain gauge amplifier | signal conditioner has options for fitting in an IP67 ABS or to a DIN rail fixture
| Options | Code |
|---|---|
| 18/24V DC 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 |
These are the following industries and applications in which this product has been used:
- Alternative Energy - Signal Amplifier Use in Solar Energy Application
- Silo & Weighing Industry - Remote Silo Weighing
- Marine - Anchor Testing
- Food Industry - Load Measurement in Pea Farming
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- Q: Can the SGA be mounted on a DIN Rail?
A: Yes, the SGA can be mounted on a DIN Rail using a D4 base plate listed as an optional accessory for your SGA.
- Q: Does the SGA have shunt calibration?
A: The SGA has an onboard shunt calibration function. This shunts one arm of the connected load cell to produce a known change in the output which can be used for calibration or checking load cell integrity (or associated wiring).
- Q: Does the SGA / LVDT lose its calibration if you switch it from 4-20 mA to 0-10 V?
A: Yes
- For more 'Frequently Asked Questions' please see our Knowledge Centre
