<h2>Overview</h2>
<p>The <strong>Dwyer SFI-700-1-1/2″ sight flow indicator</strong> is a standard industrial flow visualization device designed for continuous monitoring of gas and liquid flow in piping systems. This unit features a durable glass tube construction with a bright red rotating Acetal impeller that provides immediate visual confirmation of flow direction and relative velocity. The 1-1/2″ threaded process connection and compact design make it a practical choice for process control, hydraulic lines, and compressed air applications.</p>
<h2>Key Features</h2>
<ul>
<li>Bright red Acetal rotating impeller—easy to observe from any viewing angle</li>
<li>Tempered borosilicate glass tube for superior clarity and chemical resistance</li>
<li>Threaded NPT/FNPT connections for quick installation in existing lines</li>
<li>Internal wiper design—rotate the glass tube to restore visibility without interrupting flow</li>
<li>Available with brass or 316 stainless steel body for corrosive or sanitary applications</li>
<li>Compact footprint: 4.875″ length × 2.750″ height (124 × 70 mm)</li>
</ul>
<h2>Technical Specifications</h2>
<ul>
<li><strong>Body Size:</strong> 1-1/2″ NPT/FNPT threaded connections</li>
<li><strong>Maximum Pressure:</strong> 230 psig (16 bar)</li>
<li><strong>Temperature Limit:</strong> 212°F (100°C)</li>
<li><strong>Viewing Medium:</strong> Tempered borosilicate glass tube</li>
<li><strong>Impeller:</strong> Bright red Acetal rotating element</li>
<li><strong>Body Material:</strong> Brass or 316 stainless steel (specify when ordering)</li>
<li><strong>Gasket:</strong> Fluoroelastomer</li>
<li><strong>Dimensions (L × H):</strong> 4.875″ × 2.750″ (124 × 70 mm)</li>
<li><strong>Weight:</strong> 5.1 lb (2.3 kg)</li>
</ul>
<h2>Typical Applications</h2>
<ul>
<li>Hydraulic fluid circulation monitoring in machine tools and presses</li>
<li>Compressed air line flow indication for pneumatic systems</li>
<li>Coolant and process liquid monitoring in industrial manufacturing</li>
<li>Water and non-corrosive chemical flow verification</li>
<li>HVAC and refrigeration system diagnostics</li>
<li>OEM equipment flow verification and troubleshooting</li>
</ul>
<h2>Compatibility & Replacements</h2>
<h3>Compatible With</h3>
<ul>
<li>Standard 1-1/2″ NPT/FNPT piping and manifold ports</li>
<li>Hydraulic systems rated to 230 psig operating pressure</li>
<li>Pneumatic systems rated to 230 psig</li>
<li>Fluid temperatures up to 212°F (100°C)</li>
<li>Compatible with non-corrosive gases, oils, coolants, and water</li>
</ul>
<h3>Replaces / Drop-In Replacement For</h3>
<ul>
<li>Earlier Dwyer SFI-700-1-1/2″ models</li>
<li>Other 1-1/2″ threaded sight flow indicators with similar pressure and temperature ratings</li>
<li>WE Anderson A36N and equivalent Midwest indicator designs</li>
</ul>
<h3>Works With</h3>
<ul>
<li>Standard industrial piping (PVC, steel, aluminum)</li>
<li>Hydraulic and pneumatic valve manifolds</li>
<li>Pressure gauges and flow control valves for integrated system monitoring</li>
<li>Maintenance and diagnostics tools for flow rate observation</li>
</ul>
