STAPERM™ Model AG-4-UG

The STAPERM™ AG-4-UG is a packaged silver/silver chloride reference electrode for permanent underground cathodic protection monitoring. The electrode is surrounded by non-polarizing backfill in a blue cotton bag.

Technology and construction

The reference electrode is factory packaged in a cotton bag containing specially selected non-polarizing backfill. This places a prepared contact medium around the electrode, while the high-impact ABS housing protects the internal assembly during handling and installation.

Key advantages

• Prepared electrode-to-soil interface: The packaged backfill supplies a defined contact medium immediately around the electrode.
• Simplified installation: Electrode and backfill arrive as one assembly, reducing separate material handling at the installation location.
• Long-term monitoring: The permanent configuration provides a dedicated reference point for checking buried structures over time.
• Clear chemistry identification: The colored bag helps distinguish copper, zinc and silver models during installation.

Applications

Permanent monitoring of buried pipelines and tanks in chloride-bearing soils, including the catalog’s 200 ppm and higher soil category.

Technical specifications

• Housing: high-impact ABS tube, 2 in. diameter × 7 in. long.
• Pre-packaged dimensions: approximately 6 in. diameter × 14 in. long.
• Pre-packaged weight: approximately 15 lb.
• PVC reinforcement at electrode end: 1/4 in. × 3 in.
• Lead wire: 30 ft of #14 AWG RHH-RHW cable.
• Design life: 30 years.
• Stability: ±5 mV with a 3.0 µA load.
• Operating temperature: 32°F to 150°F.
• Special sizes available on request.

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