HC-200NH, Field-Installation Type Ammonia Nitrogen Meter, HORIBA

The HC-200NH is HORIBA's field-installation type ammonia nitrogen meter, purpose-built for continuous NH₄-N monitoring and aeration control in biological reaction tanks at municipal and industrial wastewater treatment facilities. It uses the ion electrode method with HORIBA's AM-2000 sensor unit, which incorporates an ammonium ion chip (7691), a potassium ion compensation chip (7692), and a reference chip (7211). The potassium compensation function corrects for potassium ion interference — valid where potassium concentration does not exceed 10 times the ammonium concentration and remains under 1000 mg/L. A key distinguishing feature is the sensor self-diagnostic function, which continuously monitors membrane resistance to detect sensor deterioration in real time, allowing measurements to continue reliably while anomalies are diagnosed — significantly reducing the risk of sudden operational shutdowns. Sensor chip replacement is tool-free. An optional DO-2000 optical DO sensor (with 5700A cap) can be connected to the same converter for simultaneous DO and NH₄-N monitoring from a single field unit. HORIBA's proprietary technology ensures long-term measurement stability, and a protective film improves antifouling performance, particularly when combined with HORIBA's ultrasonic cleaner.

Key Features HC-200NH

• Ion electrode method with potassium ion compensation — accurate NH₄-N measurement in the presence of potassium interference (K⁺ ≤10× NH₄-N concentration, ≤1000 mg/L).
• Sensor self-diagnostic function via membrane resistance measurement — continuous real-time deterioration detection; measurement continues during diagnosis.
• Reduced risk of sudden shutdown — anomalies detected and reported before sensor failure causes measurement loss.
• Tool-free chip replacement — easy on-site maintenance without manufacturer callout.
• Optional simultaneous DO measurement — DO-2000 optical sensor (5700A cap) connectable to same converter; DO 0–20 mg/L, 0–200% saturation, 0–50 °C.
• Three isolated 4–20 mA DC outputs (max. 900 Ω): selectable from NH₄-N concentration, DO concentration, NH-temperature, DO-temperature — any 3 of 4.
• Protective film for antifouling; compatible with HORIBA ultrasonic cleaner for improved long-term stability.
• Calibration adjustment against manual analysis (1-point) and calibration curve input (linear equation).
• Sample conditions: pH 4.0–8.5; temperature 0–40 °C; measurement depth up to 10 m; wetted materials SUS316, FKM, PVC.
• IP65 (IEC60529 / JIS C0920); pole (50 A) or wall mount; aluminium alloy housing; SUS304 hood; −20 to 55 °C.
• CE marked; FCC Part 15.

Applications

The HC-200NH is suited to continuous NH₄-N monitoring and aeration/nitrification control in biological reaction tanks at municipal wastewater treatment plants, industrial wastewater treatment facilities, water recycling processes, and sequencing batch reactors (SBR) — particularly where fast response, low-concentration detection, and reliable long-term operation are required.

Installation and Safety Notes

Mount on a 50 A pole or wall. Power: 100–240 V AC, 50/60 Hz, 28 VA max. Sensor chips 7691 and 7692 must be stored at 1–30 °C. Sample must be within pH 4.0–8.5 and 0–40 °C. Maximum measurement depth 10 m. Ultrasonic cleaner compatible for antifouling maintenance. Operating temperature: −20 to 55 °C; humidity: not specified (standard H-1 Series outdoor conditions apply).

Technical Specifications