The Model GM/MS is an ACTIVE System designed to assure the continuity and the continued viability of a building’s grounding systems.

The Model GM/MS continuously monitors the resistivity of the soil around the building grounding system. This is accomplished through the use of two dedicated sensing rods (typically 1-4 feet in length) that are in the area of the grounding system and are spaced a distance apart so that the resistance of the soil can be measured. A low DC voltage is connected to one of the sense rods and its return path is the second sense rod. The voltage drop between the two sense rods is indicative of the resistivity of the soil, which is determined primarily by the amount of moisture present in the soil.

When the Model GM/MS senses that its upper set-point limit has been exceeded, it responds by activating a solenoid-operated valve that is connected to a water source. Water is gently applied to the soil in the areas where the electrical ground system is located. The water can be applied through the use of a “hollow” ground rod near the electrical system’s ground rod, if only one is used. For grounding systems that cover a large area and/or have multiple rods or grids, a soaker-type hose can be used, either on the surface of the soil or buried a few inches deep. Small spray heads and multiple solenoid valves may also be used if the grounding system is in multiple areas like many broadcast, communications and satellite receiving sites. But unlike an irrigation system, the circuitry in the Model GM/MS is also continuously monitoring the soil resistivity as the environmentally friendly water is being applied. Once it senses that the soil’s resistivity is again below the set-point limit, the valve is de-energized and water flow ceases. Alternatively, a ground-lowering material could be used in place of water or diluted with water and applied to the soil.

The continuous monitoring and corrective action (controlled water application) of the Model GM/MS provides the ability to automatically maintain an electrical ground system’s operational readiness. The Technology also incorporates visual and audible annunciation for indicating status and has dedicated dry-contacts to interface with remote monitoring equipment if desired.

Since the Model GM/MS has the sense rods in the area of the electrical grounding system components, an additional capability provides monitoring of a facility or site’s ground. This function confirms that equipment, AC outlets, etc. are connected to the electrical ground. This is accomplished by connecting the system to one of the facilities ground points (e.g. A/C outlet). If an open circuit is detected, indicating that there is a “ground anomaly”, the Model GM/MS provides an audible & visual alarm alert. The system is also equipped with dedicated dry contacts for remote monitoring and reporting of this function.

Finally, a solution that addresses the long-time need to monitor & maintain an optimal electrical ground system, automatically, and without human intervention.