<h2>Overview</h2>
<p>The <strong>Interface SGA/A strain gauge amplifier</strong> is a compact, universal signal conditioning module designed to convert millivolt-level signals from strain gauge bridges into standard industrial outputs. Built by Interface, Inc., a leader in load cell and transducer instrumentation, the SGA/A operates on 110–230VAC or 18–24VDC and delivers 4–10W output power suitable for a wide range of measurement and automation applications.</p>
<h2>Key Features</h2>
<ul>
<li>Wide sensitivity range: 0.1 mV/V to 30 mV/V via DIP switches and potentiometer fine-tuning</li>
<li>Zero offset and scale dead-band compensation up to 79%</li>
<li>Multiple configurable analog outputs: ±10V, ±5V, 0–10V, 0–5V, 0–20mA, 4–20mA</li>
<li>Accepts full, half, and quarter-bridge strain gauge configurations</li>
<li>AC-powered version provides mains transformer isolation</li>
<li>Flexible input filtering: 1 Hz to 5 kHz</li>
</ul>
<h2>Technical Specifications</h2>
<ul>
<li><strong>Input Sensitivity Range:</strong> 0.1–30 mV/V (software-selectable via gain switches)</li>
<li><strong>Operating Voltage (SGA/A):</strong> 110–230VAC or 18–24VDC</li>
<li><strong>Output Power:</strong> 4–10W</li>
<li><strong>Output Signals:</strong> User-selectable ±10V, ±5V, 0–10V, 0–5V, 0–20mA, 4–20mA</li>
<li><strong>Transducer Offset Compensation:</strong> Up to ±79%</li>
<li><strong>Zero Dead-Band Compensation:</strong> Up to 79%</li>
<li><strong>Filtering:</strong> Selectable 1 Hz–5 kHz</li>
<li><strong>Input Connector:</strong> 2.5 mm² field terminal blocks</li>
<li><strong>Calibration:</strong> Two-point calibration (with transducer connected or via mV source)</li>
<li><strong>Reference Output:</strong> 5V or 2.5V (internal, for calibration support)</li>
</ul>
<h2>Typical Applications</h2>
<p>The SGA/A amplifier suits a broad range of industrial measurement and control scenarios:</p>
<ul>
<li>Load cell signal conditioning in weighing and force measurement systems</li>
<li>Pressure and torque transducer integration in test stands and automation</li>
<li>Strain gauge bridge conditioning in structural monitoring and materials testing</li>
<li>Analog signal conversion and standardization in legacy industrial systems</li>
<li>Process measurement and control in manufacturing and hydraulic systems</li>
</ul>
<h2>Compatibility & Replacements</h2>
<h3>Compatible With</h3>
<ul>
<li>All full-bridge, half-bridge, and quarter-bridge strain gauge transducers</li>
<li>Load cells with strain gauge output (up to 30 mV/V sensitivity)</li>
<li>Pressure transducers with millivolt-level outputs</li>
<li>Torque measurement sensors</li>
<li>Industrial control systems accepting 0–10V, 4–20mA, or ±10V analog inputs</li>
<li>Legacy analog measurement systems and data acquisition hardware</li>
</ul>
<h3>Replaces / Drop-In Replacement For</h3>
<p>The SGA/A directly replaces other Interface SGA-series amplifiers configured for AC operation. Verify your existing system’s voltage and output signal requirements before substitution.</p>
<h3>Works With</h3>
<ul>
<li>Any analog input module or DAQ card accepting ±10V, 0–10V, or 4–20mA signals</li>
<li>Industrial PLCs (Allen-Bradley, Siemens, Omron, Mitsubishi) via standard analog input cards</li>
<li>Process automation and SCADA systems with analog input capability</li>
<li>Laboratory test and measurement equipment</li>
<li>Calibration simulators and mV sources for two-point calibration verification</li>
</ul>
