NHN Online Ammonia Nitrogen Sensor
The Apure NHN sensor, listed as NHN-206, uses an ammonium ion-selective electrode for online water monitoring. Specify whether the required result is ammonium, ammonium as nitrogen, or total ammonia nitrogen before configuring the system.
- Measurement Precision
- High stability
- Long life
The listed PVC-membrane electrode responds to ammonium-ion activity through a membrane potential. Calibration relates that response to the selected reporting scale. Temperature compensation does not by itself correct ionic-strength effects, interfering ions or the chemical distribution between NH4+ and NH3.
| Required result | What must be established |
|---|---|
| Ammonium ion, NH4+ | Use standards and output units defined for ammonium ion. |
| Ammonium as nitrogen, NH4-N | Confirm the nitrogen mass basis in the calibration, display and digital register. |
| Total ammonia nitrogen, NH3-N plus NH4-N | An ammonium electrode alone does not directly measure both forms. Verify the required pH/temperature inputs and validated calculation or use an appropriate reference method. |
Calibration and installation
- Select the supplied range, standards and conditioning procedure for NHN-206. Verify a separate reference sample after calibration, with sample timing and reporting basis matched.
- Assess interfering ions, particularly potassium for an ammonium ISE, and changes in water chemistry. Obtain the model-specific selectivity and matrix-adjustment instructions; do not assume universal compensation is installed.
- The listed 100 KPa (1 Bar) reference-system statement does not establish the permitted pipe pressure. Confirm process-pressure, immersion, materials and sealing limits for the complete probe.
- The listed mounting is 3/4 NPT with IP68 protection. Confirm the actual thread, cable/connector and installation conditions; provide access for electrode cleaning, reference checks and replacement.
- The listed interface is RS485 Modbus RTU. Match supply, wiring, register units and serial settings to the receiving device.
The entry previously labelled Resolution is ±0.5℃. Its unit does not specify concentration resolution; the actual concentration display increment must be confirmed for the supplied NHN-206. The original value is retained below as an unverified entry, not reassigned to a different specification. Confirm the selected range and accuracy conditions separately.
| Brand | Apure |
|---|---|
| Model | NHN-206 |
| Measuring range | 0~10.00mg/L(0~100.00mg/L) |
| Resolution entry — unverified | ±0.5℃ |
| Accuracy | ±10% or ±1mg/L |
| Digital output | Isolated protection RS485 signal output |
| Cable length | 5 meters, other lengths can be customized |
| Temperature | 0~40℃ |
