Air-cooled rectifiers (ASAI)

CerAnode’s ASAI Air-Cooled Rectifiers are compact, efficient DC power supplies designed to deliver steady current for impressed-current cathodic protection (ICCP) systems. These units convert AC mains to adjustable DC output and utilize natural or forced air convection to dissipate heat, making them ideal for small to moderate cathodic protection (CP) installations in non-harsh environments.

Built for reliability and ease of service, ASAI rectifiers provide rugged performance in a lightweight, maintenance-friendly package—ideal for pipelines, storage tanks, and other CP systems where space, cost, and simplicity are priorities.

Key Features & Benefits

Design & Construction:

Heavy-Duty Transformer: Step-down transformer with built-in reserve capacity ensures reliable output under load.
Silicon Rectifier Stack: Uses silicon diode rectifier elements for efficient AC-to-DC conversion.
Robust Cabinet: Constructed from galvanized or powder-coated steel with ventilated side panels to ensure airflow and component longevity.

Electrical Performance:

Adjustable Output: Multi-tap (step) voltage control allows fine tuning of DC output to match system amperage needs.
Lightning & Surge Protection: Built-in AC and DC surge arrestors protect against transients and spikes.
Meters & Monitoring: Separate DC volt and amp meters allow real-time system monitoring.

Durability & Environment:

Weather-Resistant Enclosure: Rated for NEMA-3R (or similar), suitable for outdoor or sheltered installations.
Serviceable Design: Removable chassis and swing-out racks ensure internal components are accessible for inspection, maintenance, or repair.
Over-Design Capacity: Transformer built with a margin to handle transient loads without overheating or overstraining.

Flexibility & Integration:

Single- or Three-Phase Input: Compatible with a variety of AC supply configurations to suit different installations.
Optional Controls: Available with constant-current (CC) or constant-voltage (CV) control, or automatic (potential-controlled) variants.
Remote Monitoring: Provision for SCADA interface, remote data logging, or communications filtering for modern CP system integration.

Applications

Cathodic protection for buried or above-ground pipelines
ICCP for storage tanks (fuel, water, chemical)
CP systems on marine structures, docks, or pier pilings
Concrete-reinforcing steel (rebar) in civil infrastructure
Facilities or installations where compact, low-maintenance DC power is needed

Installation & Accessories

Mounting: Install on pole, wall, or base—unit supports flexible mounting options.
AC Power Wiring: Connect via single-phase or three-phase input as appropriate; include magnetic circuit breaker.
DC Connection: Route low-resistance lead cables to the anode bed; provide strain relief and use proper termination hardware.
Grounding & Surge Protection: Ensure earth grounding, and verify that lightning arrestors are properly installed.
Commissioning: Adjust tap settings to achieve desired CP current/voltage, then monitor DC output and structure potential.
Maintenance: Periodically inspect and clean ventilation panels/filters, verify meter accuracy, and check internal components