HORIBA HE-480H Industrial Online High-Conductivity Monitor

Overview

The HORIBA HE-480H is an industrial-grade, outdoor-rated online conductivity monitor engineered for continuous, high-reliability measurement in demanding water quality monitoring applications. Designed as part of HORIBA’s H-1 series of ruggedized environmental analyzers, the HE-480H employs a four-electrode conductivity sensing principle—eliminating polarization effects and enabling stable, low-drift performance across wide dynamic ranges, including high-conductivity media such as industrial effluents, brines, and seawater-influenced process streams. Unlike two-electrode systems, the four-electrode configuration separates current-driving and voltage-sensing functions, ensuring accurate measurement independent of electrode fouling or surface resistance changes—a critical advantage in untreated wastewater, cooling tower water, or chemical dosing control loops. The instrument operates with a fixed-cell-constant (1.0 cm⁻¹) FES-series conductivity sensor, optimized for linearity and reproducibility under variable temperature and ionic strength conditions. Its reference temperature compensation algorithm supports user-defined reference points (5–95 °C) and adjustable temperature coefficients (±5 %/°C), complying with ISO 7888 and ASTM D1125 conductivity standardization practices.

Key Features

• Rugged aluminum housing rated IP65 for outdoor installation—resistant to dust ingress and low-pressure water jets.
• Large, high-contrast digital display enabling at-a-glance reading of conductivity, temperature, and status indicators—even under direct sunlight or low-light conditions.
• Integrated self-diagnostic functionality: real-time detection of sensor open/short circuits, temperature probe failure, and signal saturation; alerts via relay outputs and on-screen indicators.
• Two programmable SPDT relay outputs (R1, R2) supporting configurable logic: upper/lower limit alarms, maintenance reminders, or ON/OFF control signals—fully compliant with IEC 61000-4 electromagnetic immunity requirements.
• Isolated 4–20 mA analog output with maximum load capability of 900 Ω, suitable for integration into PLCs, DCS, or SCADA systems without signal degradation over extended cable runs.
• Comprehensive regulatory alignment: CE-marked per EMC and LVD directives; FCC Part 15 Class B certified; RoHS 2011/65/EU and WEEE 2012/19/EU compliant—ensuring suitability for global deployment in regulated infrastructure environments.

Sample Compatibility & Compliance

The HE-480H is validated for use with HORIBA FES-series conductivity electrodes (cell constant 1.0 cm⁻¹), which are constructed from corrosion-resistant platinum and PEEK materials—suitable for aggressive media including chlorinated wastewater, acidic leachates, and saline process streams. It supports three primary conductivity ranges (0.00–20.00, 0.0–200.0, and 0.0–500.0 mS/cm), with corresponding SI-unit equivalents up to 50.00 S/m. For applications requiring salinity reporting, the unit provides dual conversion modes: NaCl-based (0.00–4.00 %) and general salt (0.0–20.0 %), both traceable to NIST-traceable calibration standards. All measurements adhere to temperature-compensated conventions per ISO 7888 Annex A, and the device maintains repeatability within ±0.5 % FS (±1.0 % at upper range limits). Its operating ambient specification (−5 to +45 °C) ensures reliable function in unconditioned pump stations, rooftop monitoring kiosks, and remote treatment facilities.

Software & Data Management

While the HE-480H operates as a standalone analog transmitter with local display and relay logic, it is fully compatible with HORIBA’s optional data acquisition modules—including the DA-100 series loggers—for time-stamped trend recording, alarm history storage, and CSV export. Calibration data—including electrode constant input, reference temperature, and temperature coefficient—is retained in non-volatile memory and supports audit-ready documentation. Though not natively Part 11-compliant, the system architecture permits integration with validated third-party SCADA platforms that implement electronic signature, audit trail, and change control protocols required under FDA 21 CFR Part 11 and EU Annex 11 for GMP-regulated water systems. Firmware updates are performed via physical parameter adjustment—ensuring deterministic behavior without network exposure.

Applications

• Real-time conductivity monitoring in municipal wastewater influent/effluent channels and combined sewer overflows (CSOs).
• Process control of desalination pre-treatment units, reverse osmosis feedwater, and brine concentration loops.
• Industrial cooling water management—detecting chloride breakthrough, scaling potential, and biocide dosage efficacy.
• Pharmaceutical purified water (PW) and water-for-injection (WFI) distribution loop surveillance—when paired with appropriate low-conductivity sensors (note: HE-480H is optimized for mid-to-high range; low-range variants available separately).
• Environmental compliance reporting for discharge permits (e.g., NPDES), where conductivity serves as a surrogate indicator for total dissolved solids (TDS) and ionic contamination.

FAQ

Does the HE-480H support automatic temperature compensation?

Yes—it features configurable reference temperature (5–95 °C) and temperature coefficient (±5 %/°C), aligned with ISO 7888 recommendations.
Can it be used for seawater monitoring?

Yes, with full salinity conversion (0.00–4.00 % NaCl) and extended range up to 500.0 mS/cm; however, temperature compensation is disabled above 200.0 mS/cm per design specification.
What is the recommended calibration frequency?

HORIBA recommends quarterly verification using certified KCl standards (e.g., 1413 µS/cm, 12.88 mS/cm); field calibration requires single-point temperature reference comparison.
Is the 4–20 mA output intrinsically safe?

No—the output is isolated but not certified for hazardous areas; explosion-proof enclosures or barriers must be added per IEC 60079-11 if deployed in Zone 1/2 locations.
Which electrodes are compatible?

Only HORIBA FES-series conductivity sensors with 1.0 cm⁻¹ cell constant; alternate cell constants require model-specific firmware and are not supported on HE-480H.