<h2>Overview</h2>
<p>The <strong>Robertshaw 304B-B2-B5</strong> Level-Tek is a rugged, capacitance-actuated on-off level control sensor engineered for reliable tank and enclosure fluid monitoring. This discontinued model remains a trusted surplus replacement for legacy industrial systems where proof-of-concept and cost efficiency matter. The sensor combines an explosion-proof enclosure with intrinsically safe probe inputs, making it suitable for hazardous locations.</p>
<h2>Key Features</h2>
<ul>
<li>Capacitance-actuated sensing—no moving parts or floats</li>
<li>120V AC, 50/60 Hz operation with ±10% voltage tolerance</li>
<li>DPDT dust-tight relay with adjustable dead band (hysteresis)</li>
<li>CSA-certified explosion-proof enclosure</li>
<li>Intrinsically safe probe input circuit for hazardous area deployment</li>
<li>1/2 IN NPT probe connection for flexible tank mounting</li>
</ul>
<h2>Technical Specifications</h2>
<ul>
<li><strong>Part Number:</strong> 304B-B2-B5</li>
<li><strong>Supply Voltage:</strong> 120 VAC ±10%, 50/60 Hz</li>
<li><strong>Relay Type:</strong> DPDT (Double-Pole Double-Throw), dust-tight</li>
<li><strong>Sensor Technology:</strong> Capacitance-actuated on-off control</li>
<li><strong>Enclosure Rating:</strong> CSA-certified explosion-proof</li>
<li><strong>Probe Connection:</strong> 1/2 IN NPT</li>
<li><strong>VA Rating:</strong> 5 VA</li>
<li><strong>Weight:</strong> 3.46 lbs</li>
<li><strong>Differential (Dead Band):</strong> Adjustable</li>
<li><strong>Status:</strong> Discontinued by manufacturer</li>
</ul>
<h2>Typical Applications</h2>
<p>The 304B-B2-B5 is widely used in industrial processes requiring precise liquid level detection:</p>
<ul>
<li>Oil and petroleum tank monitoring in hazardous locations</li>
<li>Water treatment and chemical process control</li>
<li>Coolant level management in manufacturing equipment</li>
<li>Hydraulic fluid reservoir monitoring</li>
<li>Enclosure drain sump detection and pump control</li>
<li>HVAC and refrigeration systems with condensate traps</li>
</ul>
<h2>Compatibility & Replacements</h2>
<h3>Compatible With</h3>
<ul>
<li>Robertshaw Level-Tek probe assemblies and accessories</li>
<li>120 VAC control systems and industrial panels</li>
<li>Hazardous location electrical enclosures (Class I, Div 2 rated)</li>
<li>Standard industrial relay circuits and ladder logic</li>
<li>Mechanical and electrical interlocks requiring contact closure</li>
</ul>
<h3>Replaces / Drop-In Replacement For</h3>
<p>The 304B-B2-B5 serves as a direct replacement for legacy Robertshaw Level-Tek 120V capacitance sensors. Verify compatibility with your system integrator before ordering, as probe lengths and NPT adapters may vary by application.</p>
<h3>Works With</h3>
<ul>
<li>Industrial PLCs and motor starters accepting DPDT relay contacts</li>
<li>Programmable relays and logic controllers (24 VDC/120 VAC coil circuits)</li>
<li>Mechanical and electronic timer circuits</li>
<li>SCADA and local panel instrumentation</li>
<li>Pump start/stop and alarm circuits</li>
</ul>
