HORIBA HE-200H Industrial Online High-Conductivity Analyzer
| Brand | HORIBA |
|---|---|
| Origin | Japan |
| Model | HE-200H |
| Measurement Principle | Four-Electrode Conductivity |
| Range | 0.0–200.0 mS/cm (auto-ranging, dual-scale: 0.00–20.00 mS/cm & 0.0–200.0 mS/cm) |
| Temperature Compensation | 0–100 °C (Pt1000 sensor) |
| Accuracy | ±0.5% FS (0–20.00 mS/cm), ±1.0% FS (20.0–200.0 mS/cm) |
| Repeatability | ±0.1 °C (temperature), linearity ±0.5 °C |
| Enclosure Rating | IP65 |
| Compliance | CE, FCC, RoHS, WEEE |
| Output | Three isolated 4–20 mA analog outputs (max load 900 Ω), three SPDT relay contacts (R1/R2/failure), RS-485 Modbus RTU interface |
| Power Supply | 90–264 V AC, 50/60 Hz, ≤15 W |
| Operating Ambient | −20 to +55 °C |
| Weight | ~4.5 kg |
| Housing Material | Anodized aluminum alloy |
| Mounting | Pole-mounted (50A pipe) or wall-mountable |
| Electrode Constant Options | 0.1 cm⁻¹ or 1.0 cm⁻¹ |
Overview
The HORIBA HE-200H is an industrial-grade, outdoor-rated online conductivity analyzer engineered for continuous, high-reliability measurement in demanding water quality monitoring applications. Utilizing a robust four-electrode conductivity measurement principle, the HE-200H eliminates polarization errors and electrode fouling effects common in two-electrode systems—making it especially suitable for high-conductivity media such as industrial effluents, brine streams, seawater intake, chemical process liquors, and desalination plant reject water. Unlike laboratory benchtop meters, the HE-200H is designed for permanent installation in unconditioned environments, featuring an IP65-rated aluminum enclosure, wide operating temperature range (−20 to +55 °C), and integrated Pt1000 temperature compensation across 0–100 °C. Its dual-range capability (0.00–20.00 mS/cm and 0.0–200.0 mS/cm) enables precise resolution at low conductivity levels while maintaining stability and accuracy at elevated conductivities—critical for applications requiring both trace-level sensitivity and high-range linearity.
Key Features
- Four-electrode conductivity sensing architecture for enhanced accuracy, reduced drift, and immunity to coating-induced measurement errors
- Large, sunlight-readable digital display with simultaneous real-time visualization of conductivity, temperature, and status diagnostics
- Configurable analog outputs: three independent 4–20 mA current loops (each galvanically isolated, max 900 Ω load) assignable to conductivity, temperature, or derived parameters (e.g., salinity, NaCl %)
- Three programmable SPDT relay outputs supporting upper/lower limit alarms, fault signaling, and maintenance alerts—with configurable hysteresis and delay logic
- RS-485 serial interface compliant with Modbus RTU protocol for integration into SCADA, DCS, or centralized data acquisition systems
- Onboard self-diagnostic functions including electrode integrity verification, analyzer hardware health check, and calibration history logging
- Tool-free terminal access with captive screw-type connectors minimizing wiring errors and ensuring long-term connection reliability
- Compliance with international electromagnetic compatibility and safety standards: CE (EN 61326-1, EN 61000-6-2/6-4), FCC Part 15 Class B, RoHS Directive 2011/65/EU, and WEEE Directive 2012/19/EU
Sample Compatibility & Compliance
The HE-200H is validated for continuous monitoring of aqueous solutions across diverse industrial and environmental contexts—including municipal wastewater outfalls, cooling tower blowdown, electroplating rinse baths, pharmaceutical process water, food & beverage CIP validation streams, and coastal aquaculture intake. Its four-electrode cell design accommodates high-solids content and variable viscosity without signal degradation. The instrument supports automatic temperature compensation per DIN EN 27888 and ASTM D1125 standards, and permits user-defined conversion to salinity (0.00–4.00% seawater equivalent), NaCl concentration (0.0–20.0%), and select acid/base concentrations (e.g., NaOH, HNO₃, H₃PO₄). All firmware and configuration data are retained during power loss. While not certified to IEC 62443 or ATEX, its electrical isolation and ingress protection meet general-purpose hazardous area requirements for Zone 2/Class I Div 2 when installed per local codes.
Software & Data Management
No proprietary PC software is required for basic operation; configuration and calibration are performed via front-panel keypad and LCD interface. However, optional configuration utilities (available via HORIBA Technical Support) enable advanced parameter mapping, alarm logic scripting, and batch export of calibration logs and diagnostic event timestamps. All analog outputs support linear or square-root scaling, and relay actions can be triggered by rate-of-change thresholds or sustained deviation conditions. Audit trail functionality records date/time stamps for all calibration events, range changes, and output configuration modifications—supporting GLP-aligned operational documentation. The RS-485 interface transmits raw sensor values, compensated readings, diagnostic flags, and system uptime counters, enabling seamless ingestion into time-series databases (e.g., InfluxDB, OSIsoft PI) under FDA 21 CFR Part 11-compliant infrastructure when paired with validated middleware.
Applications
- Real-time conductivity monitoring in industrial wastewater treatment plants for discharge compliance (e.g., EPA NPDES permit limits)
- Process control of desalination pre-treatment and post-treatment stages, including RO feed and concentrate streams
- Chemical dosing feedback control in boiler feedwater, cooling water, and scrubber liquor systems
- Salinity and brine concentration tracking in aquaculture, salt production, and oilfield water handling
- Verification of cleaning-in-place (CIP) rinse completeness in dairy, beverage, and biopharma facilities
- Early detection of heat exchanger tube leakage via conductivity spike analysis in closed-loop cooling circuits
FAQ
What electrode constants are supported?
The HE-200H accepts standard four-electrode cells with cell constants of 0.1 cm⁻¹ or 1.0 cm⁻¹. The analyzer allows direct entry of the calibrated cell constant to ensure traceable accuracy.
Can the device perform automatic range switching?
Yes—the HE-200H features auto-ranging between 0.00–20.00 mS/cm and 0.0–200.0 mS/cm based on measured value and user-defined thresholds.
Is temperature compensation mandatory?
Temperature compensation is enabled by default using the built-in Pt1000 sensor. It may be disabled only for specialized non-aqueous applications where linear correction is inappropriate.
How is calibration performed?
Conductivity calibration uses a single-point reference solution (e.g., KCl 0.01 mol/L); temperature calibration compares the Pt1000 reading against a certified reference thermometer at one stable point.
Does the unit support MODBUS TCP?
No—the HE-200H implements RS-485 physical layer with Modbus RTU protocol only. Ethernet or TCP/IP connectivity requires an external protocol converter.
