NO3-201 Digital Nitrate Nitrogen Sensor

The listed NO3-201 uses a PVC-membrane nitrate ion-selective electrode with a temperature sensor. Its electrical response depends on nitrate-ion activity; calibration, the reporting basis and the sample matrix determine how that response is expressed as a concentration.

Set up a comparable nitrate result

• Specify NO3− or NO3-N explicitly on the calibration record, controller and digital register. These are different mass-reporting bases and cannot be compared as identical mg/L readings.
• Use the supplied electrode-conditioning and calibration procedure with suitable nitrate standards. After calibration, compare against an independent sample reference on the same reporting basis.
• Check interfering anions, ionic strength, electrode condition and water chemistry. The impact of chloride or other ions depends on the actual electrode and concentrations; obtain the supplied selectivity information.
• Temperature compensation does not establish selectivity or replace matrix validation. Recheck when the process composition or expected concentration changes.

Install and integrate

• Confirm the listed 3/4-inch NPT mounting, wetted materials, cable and approved immersion or flow arrangement. Keep the sensing membrane representative of the water and accessible for maintenance.
• The existing temperature row also lists a pressure value. Verify the actual temperature and pressure rating for the supplied probe, connection and process before installation.
• For RS485 Modbus RTU, obtain the actual power and wiring requirements, register map, unit basis and serial settings. A nitrogen-reporting calculation must be verified rather than inferred from the page title.