<h2>Overview</h2>
<p>The <strong>Walchem WC-1521-0</strong> is a water treatment pH controller engineered for precise monitoring and control of pH levels in industrial processes. Walchem controllers are widely deployed in applications requiring reliable chemical dosing control, including cooling towers, boiler systems, and wastewater treatment facilities. This used unit has been inspected for functionality and represents an economical solution for facilities requiring pH process control without the cost of new equipment.</p>
<h2>Key Features</h2>
<ul>
<li>Dedicated pH control with sensor input capability</li>
<li>Relay outputs for chemical pump or solenoid control</li>
<li>Compact panel-mount or wall-mount design typical of Walchem controllers</li>
<li>Standard temperature input support for process compensation</li>
<li>Configurable control parameters (proportional band, dead band, set point)</li>
</ul>
<h2>Technical Specifications</h2>
<p>Verify the following specifications with the manufacturer or your system integrator, as this unit is surplus equipment:</p>
<ul>
<li>Sensor Input: pH/ORP compatible electrode interface</li>
<li>Control Output: Relay contact (dry contact or powered relay configuration—verify with system)</li>
<li>Temperature Input: RTD or Thermistor (specification varies by model revision)</li>
<li>Power Supply: 24 VDC or 120 VAC (verify before installation)</li>
<li>Operating Range: pH 0–14 (nominal; verify for your application)</li>
<li>Environmental: Suitable for indoor enclosure mounting</li>
</ul>
<h2>Typical Applications</h2>
<p>Walchem WC series controllers are deployed across multiple industries:</p>
<ul>
<li>Cooling tower water treatment and biocide control</li>
<li>Boiler feedwater pH adjustment</li>
<li>Wastewater neutralization and treatment</li>
<li>Industrial process water conditioning</li>
<li>Food and beverage processing water control</li>
<li>Municipal water treatment systems</li>
</ul>
<h2>Compatibility & Replacements</h2>
<h3>Compatible With</h3>
<ul>
<li>Walchem pH and ORP electrodes (WEL and WDS series recommended)</li>
<li>Standard RTD and Thermistor temperature sensors</li>
<li>Dry contact relay circuits and solenoid valve control systems</li>
<li>Chemical injection pump systems (peristaltic or solenoid)</li>
<li>Industrial process control enclosures and DIN rail mounting</li>
</ul>
<h3>Replaces / Drop-In Replacement For</h3>
<p>Verify compatibility with your system integrator before ordering. The WC-1521-0 may replace earlier WC-series controllers in similar water treatment applications, but exact replacement compatibility must be confirmed with wiring and sensor requirements.</p>
<h3>Works With</h3>
<ul>
<li>Walchem Fluent cloud-based monitoring platform (if network module available)</li>
<li>BACnet-compatible facility management systems (verify with controller revision)</li>
<li>SCADA and process monitoring systems via relay outputs</li>
<li>Standard industrial control logic and PLC integration via I/O signals</li>
</ul>
