HengaoDe ZRX-2200 Electroresistive Corrosion Rate Monitor

Overview

The HengaoDe ZRX-2200 Electroresistive Corrosion Rate Monitor is an engineered solution for continuous, real-time electroresistive (ER) corrosion monitoring in industrial process environments and laboratory settings. Based on the principle of electrical resistance change in a standardized corrosion coupon—where material loss alters cross-sectional area and thus resistivity—the ZRX-2200 delivers quantitative, time-resolved corrosion thickness data with sub-micron resolution. Unlike weight-loss gravimetric methods requiring periodic coupon removal and laboratory analysis, the ZRX-2200 enables in-situ, non-destructive measurement at user-defined intervals as short as 30 seconds. This capability supports dynamic assessment of corrosion kinetics under variable operating conditions—including flow regimes, temperature gradients, pH shifts, and inhibitor dosing events—making it particularly suitable for evaluating corrosion mitigation strategies in pipelines, refinery heat exchangers, boiler feedwater systems, and chemical processing vessels.

Key Features

• High-resolution 24-bit analog-to-digital conversion ensures stable baseline tracking and detection of minute resistance changes corresponding to <0.001 µm thickness loss at nominal coupon thickness (0.25 mm).
• Integrated dual-sensor capability: simultaneous real-time corrosion thickness and ambient/medium temperature measurement (−50°C to +200°C, 0.1°C resolution), enabling temperature-compensated corrosion rate calculation per ASTM G163 and ISO 9223 Annex B.
• Industrial-grade 7-inch capacitive IPS touchscreen with glove-compatible operation and intuitive menu navigation; calibrated real-time clock (±5 ppm) supports timestamped data integrity for audit trails.
• Ruggedized enclosure (IP54-equivalent ingress protection via sealed front panel and gasketed I/O ports) rated for continuous operation between −20°C and +70°C ambient, with humidity tolerance up to 80% RH non-condensing.
• USB 2.0 interface compliant with CDC ACM class protocol for direct connection to Windows/Linux PCs; no proprietary drivers required for data export in CSV or Excel-compatible formats.
• DC 12 V power input with overvoltage and reverse-polarity protection; compatible with standard industrial power supplies or battery-backed UPS systems for remote or hazardous-area deployment.

Sample Compatibility & Compliance

The ZRX-2200 is designed for use with standardized ER coupons fabricated from carbon steel (A106, API 5L), stainless steels (304, 316), duplex alloys, copper-nickel (90/10, 70/30), and other conductive metals conforming to ASTM G1 and NACE TM0169 specifications. Coupon geometry must comply with nominal dimensions of 25 mm × 50 mm × 0.25–0.75 mm thickness. The system meets electromagnetic compatibility requirements per IEC 61326-1 (industrial environment) and safety standards per IEC 61010-1 (measurement category II, pollution degree 2). Data acquisition workflows support GLP/GMP-aligned documentation practices, including operator ID logging, calibration verification timestamps, and uneditable raw resistance vs. time datasets—facilitating compliance with FDA 21 CFR Part 11 when paired with validated third-party data management software.

Software & Data Management

While the ZRX-2200 operates autonomously with onboard data storage (internal flash memory retains ≥30 days of 30-second interval readings), its USB interface enables seamless integration with HengaoDe’s optional CorrView™ PC application (Windows 10/11, x64). CorrView™ provides real-time graphing of thickness loss, instantaneous corrosion rate (mm/a), cumulative mass loss (g/m²), and Arrhenius-based temperature-corrected rate extrapolation. All exported datasets include metadata headers (instrument SN, calibration date, coupon ID, sampling interval, ambient T°), supporting traceability per ISO/IEC 17025 Clause 7.7. Raw resistance values are preserved without interpolation or smoothing, preserving fidelity for post-acquisition statistical analysis (e.g., Weibull distribution fitting for pitting initiation modeling).

Applications

• Field validation of corrosion inhibitor performance in oilfield production systems (API RP 14E, NACE SP0416)
• Real-time monitoring of sour service corrosion (H₂S/CO₂ environments) in midstream pipeline test loops
• Accelerated laboratory screening of coating adhesion failure under cathodic disbondment conditions (ASTM G8, G42)
• Correlation studies between ER-derived rates and electrochemical noise (EN) or linear polarization resistance (LPR) measurements
• Long-term integrity assessment of firewater systems, cooling towers, and desalination pre-treatment piping
• Teaching corrosion fundamentals in university materials science and chemical engineering laboratories (ASTM G102 standard reference)

FAQ

What coupon materials are supported?

Carbon steels (A106, ASTM A283), stainless steels (304, 316, 2205), Cu-Ni alloys (90/10, 70/30), and aluminum alloys (5052, 6061) — provided electrical resistivity falls within 10–100 µΩ·cm range and surface finish meets Ra ≤ 0.8 µm.

Can the ZRX-2200 be used in high-pressure applications?

Yes — the ER probe assembly (sold separately) is rated to 10 MPa (1450 psi) with appropriate pressure housings; the ZRX-2200 monitor unit itself is for surface-mount or control-room installation only.

Is temperature compensation automated?

Yes — built-in Pt1000 sensor measures coupon substrate temperature; firmware applies resistivity-temperature coefficient (α) correction per ASTM G170 for each supported alloy group.

How often does the system require calibration?

Factory calibration is valid for 12 months under normal operating conditions; field verification using certified shunt resistors (0.001–10 Ω) is recommended quarterly per ISO/IEC 17025 Clause 6.6.

Does the instrument support Modbus RTU or 4–20 mA output?

Not natively — however, optional USB-to-Modbus gateways (e.g., Moxa UPort 1150) enable integration into SCADA/DAS platforms with minimal configuration.