WTW VARION® Plus Digital ISE Combination Sensor for Ammonium and Nitrate
Reagent-free measurement of Ammonium and Nitrate ion-selectively with automatic compensation of Potassium/Chloride using the VARION®Plus 700 IQ.
Information on application possibilities and areas of use is available on our website.
Product Overview
The WTW VARION® Plus is a digital ion-selective combination sensor designed for the precise measurement of Ammonium and Nitrate in water. It features reagent-free operation and automatic compensation for Potassium or Chloride ions, enhancing accuracy and simplifying usage.
Physical Characteristics
The sensor has a minimum immersion depth of 50 mm. The main body of the sensor is approximately 392 mm in length. Key connection points are indicated at 48, 55, and 40 mm along the sensor, with a SACIQ socket connection.
Technical Specifications
| Feature | Ammonium Measurement | Nitrate Measurement |
|---|---|---|
| Measuring Principle | Potentiometric | Potentiometric |
| Maximum Sensor Configuration | Common reference electrode, two measuring electrodes, one compensation electrode | |
| Integrated Measuring Chains: Reference | VARION®Plus Ref | VARION®Plus Ref |
| Measuring Electrode | VARION®Plus NH4, VARION®Plus K | VARION®Plus NO3, VARION®Plus Cl |
| Measurement Ranges/Resolution | NH4-N: 1 ... 2,000 mg/l / 1 mg/l; 0.1 ... 100.0 mg/l / 0.1 mg/l NH4+: 1 ... 2,580 mg/l / 1 mg/l; 0.1 ... 129.0 mg/l / 0.1 mg/l K+: 0.1 ... 1,000 mg/l / 0.1 mg/l | NO3-N: 1 ... 1,000 mg/l / 1 mg/l; 0.1 ... 100.0 mg/l / 0.1 mg/l NO3-: 5 ... 4,500 mg/l / 5 mg/l; 0.5 ... 450.0 mg/l / 0.5 mg/l Cl-: 0.1 ... 1,000 mg/l / 0.1 mg/l |
| Measurement Accuracy (Lab Standards) | ±5% of reading ± 0.2 mg/l in standard solutions | |
| Calibration Types | Matrix adjustment against any reference value, 2-point calibration with combined standards possible | |
| Service Life (typical) | Reference electrode: 18 months, Measuring and compensation electrode: 18 months in typical application (municipal wastewater treatment plants) | |
| Temperature Measurement and Compensation | Integrated NTC, Range 0 °C ... +40 °C, Accuracy ±0.5 K, Resolution 0.1 K, t95 < 20 s | |
| pH Range | pH 4 ... pH 8.5 | pH 4 ... pH 11 |
| Pressure Resistance | Maximum 0.2 bar (incl. sensor connection cable, with integrated measuring chains) | |
| Environmental Conditions | Operating temperature: 0 °C ... +40 °C, Storage temperature: 0 °C ... +40 °C | |
| Electrical Connection | 2-wire shielded cable with quick-connect at the sensor | |
| Electromagnetic Compatibility | EN 61326, Emission: Class B, FCC Class A. Immunity for essential operation. | |
| Test Marks | CE, UKCA | |
| Mechanics | Housing shaft: V4A stainless steel 1.4571 Temperature sensor: V4A stainless steel 1.4571 Measuring chain holder: POM Protective cage: POM, Protection class: IP 68 (0.2 bar, with integrated measuring chains) | |
| Weight | Approx. 670 g (without measuring chains, without sensor connection cable) | |
| Warranty | VARION®Plus 700 IQ: 2 years; Electrodes: 1 year for material defects | |
Product Variants and Ordering Information
| Model | Description | Order No. |
|---|---|---|
| VARION®Plus 700 IQ | Digital armature for ion-selective measurement of Ammonium and Nitrate, without electrodes (Cable please order separately) | 107040 |
| VARION®Plus AN/A comp SET NH4 & NO3 | VARION®Plus 700 IQ, VARION®Ref, VARION®Plus NH4 and VARION®Plus NO3, VARION®Plus K (Potassium) (Cable please order separately) | 107066 |
| VARION®Plus AN/N comp SET NH4 & NO3 | VARION®Plus 700 IQ, VARION®Ref, VARION®Plus NH4 and VARION®Plus NO3, VARION®Plus Cl (Chloride) (Cable please order separately) | 107068 |
