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Measuring principle
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Electrochemical
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Maximum configuration of a sensor
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Common reference electrode, two measuring electrodes, one compensation electrode
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Integrable measuring chains:
reference
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VARiON ® Plus Ref
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measuring electrode
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VARiON® Plus NH 4 _
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VARiON ® Plus NO 3
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compensation
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VARiON ® Plus K
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VARiON ® Plus Cl
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Measuring ranges/resolution
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NH 4 -N :
1 ... 2,000 mg/l / 1 mg/l;
0.1 ... 100 mg/l / 0.1 mg/l
NH 4 + :
1 ... 2,580 mg/l / 1 mg/l;
0.1 ... 129.0 mg/l / 0.1 mg/l
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NO 3 -N:
1 … 1,000 mg/l / 1 mg/l;
0.1 ... 100 mg/l / 0.1 mg/l
NO 3 -:
5 … 4500 mg/l / 1 mg/l;
0.5 ... 450.0 mg/l / 0.1 mg/l
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Compensation areas
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K + :
0.1 ... 1,000 mg/l / 0.1 mg/l
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Cl - :
0.1 ... 1,000 mg/l / 0.1 mg/l
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Measurement accuracy in laboratory standards
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± 5% of measured value ± 0.2 mg/l in standard solutions
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Calibration types
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Matrix adjustment against any reference value, 2-point calibration with combined standards possible
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Downtime (typical)
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Reference electrode: 18 months, measuring and compensation electrode: 18 months for typical application (municipal sewage treatment plants)
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Temperature measurement
and compensation
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Integrated NTC,
range 0 °C … +40 °C,
accuracy ±0.5 K, resolution 0.1 K, t 95 < 20 s
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Compressive strength
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Maximum 0.2 bar (including sensor connection cable, with built-in measuring chains)
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Environmental conditions
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Operating temperature: 0 °C … +40 °C, storage temperature: 0 °C … +40 °C
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Electrical connection
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2-core shielded cable with quick release on the sensor
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Electromagnetic compatibility
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EN 61326, Emission: Class B, FCC Class A
Immunity for essential operation
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Test mark
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CE
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mechanics
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Housing shaft: V4A stainless steel 1.4571
Protective basket: POM,
temperature sensor: V4A stainless steel 1.4571
Protection class: IP 68 (0.2 bar, with built-in measuring chains)
Measuring chain holder: POM
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Weight
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Approx. 670 g (without measuring chains, without sensor connection cable)
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guarantee
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VARiON ® Plus 700 IQ: 2 years
Electrodes: 1 year for material defects in accordance with § 10 General Terms and Conditions
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