Cathodic Protection & Corrosion Monitoring

Frequently Asked Questions

How does the high-impedance measurement circuit in the CM-CP series prevent loading errors during pipe-to-soil potential testing?

Cathodic protection circuits rely on small DC currents flowing between reference electrodes (such as Copper/Copper-Sulfate reference cells) and buried steel structures. Standard low-impedance voltmeters draw current from the reference cell, creating voltage drops across high-resistance soils that result in false, artificially low potential readings. The CM-CP device incorporates a specialized analog front end with an input impedance exceeding 10 Mohms. This ultra-high impedance ensures that virtually zero electrical current is drawn from the measurement circuit, enabling accurate, unattenuated DC voltage readings (+/-10V DC) across the structure test lead and reference electrode regardless of soil moisture or ground resistivity.   

What dual-channel capabilities allow simultaneous monitoring of DC protection levels and induced AC interference?

Buried pipelines sharing rights-of-way with high-voltage AC power lines or electric railways often experience induced AC voltages that cause AC-induced corrosion and posing safety risks to field crews. The CM-CP terminal architecture features dual measurement channels that simultaneously capture DC structure potential (+/-10V DC) and induced AC voltage (0-30V AC). The internal microprocessor digitizes both signals independently, filtering high-frequency noise while preserving true DC structure polarization readings and peak AC interference levels for transmission to the Ellenex Software Platform.  

How are test lead wires connected to the buried pipe and reference cell during field installation at cathodic protection test stations?

The CM-CP device connects directly into existing pipeline test posts or junction boxes via durable pin connectors or direct multi-conductor wiring. Technicians connect one terminal lead to the structure wire (welded directly to the steel pipe) and the second terminal lead to a permanently buried reference electrode (such as a Cu/CuSO4 cell) installed adjacent to the pipe. When evaluating impressed current systems, additional connections can be made to coupon test stations or rectifier output shunts to verify operating current and voltage levels.   

How does the Ellenex Software Platform alert corrosion engineers when a cathodic protection rectifier fails?

The Ellenex Software Platform features a dynamic alerting engine. Engineers establish custom lower and upper protection criteria based on industry standards, such as setting an alert threshold when pipe-to-soil potential drops below -850 mV DC relative to a Cu/CuSO4 electrode. If an upstream rectifier loses power or trips a breaker, causing protection levels to collapse, the platform immediately generates multi-channel notifications via SMS, email, or app push alerts, enabling fast maintenance dispatch before active corrosion initiates.   

Which LPWAN connectivity option is optimal for long-distance cross-country oil and gas pipelines?

The solution offers two LPWAN variants: LoRaWAN (-L) and Cellular LPWAN (-N) supporting NB-IoT and LTE Cat-M1. For long-distance pipelines passing through remote regions with cellular coverage, the Cellular LPWAN option (-N) transmits directly to public cellular base towers using a pre-installed SIM card without local gateway setup. For large industrial tank farms, refineries, or localized pipeline terminals, the LoRaWAN variant (-L) communicates with an Ellenex Outdoor Gateway, providing localized network coverage with zero ongoing airtime fees.  

How does automated remote cathodic protection logging assist in meeting stringent environmental and pipeline safety regulations?

Regulatory authorities require pipeline operators to maintain continuous proof that buried steel assets maintain adequate cathodic protection to prevent corrosion leaks. The Ellenex Software Platform automatically logs every telemetry transmission into an unalterable historical database. Corrosion personnel can export automated compliance reports showing daily, monthly, or annual potential curves across all test stations, providing audit-ready evidence for regulatory inspections without manual field sampling.   

What field battery management scheme supports continuous multi-year monitoring in isolated outdoor enclosures?

The hardware operates autonomously using an internal 3.6V primary Lithium battery (LiSOCl2) known for its ultra-low self-discharge rate and wide operating temperature range (-30°C to +55°C). Utilizing low-power firmware algorithms, the sensor remains in a deep sleep state between measurement cycles. At scheduled intervals, the device wakes up, stabilizes the high-impedance input stage, measures DC potentials and AC voltages, packages the encrypted telemetry payload, and transmits it via LPWAN before returning to sleep. This power management scheme supports up to 10 years of field operation on a single battery.