wtw TresCon NOx-N, Operating Manual

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NOx-N Technical data
5 - 1 ba43110e05 01/2011
5 Technical data
Note
All specifications of the measuring accuracy refer to the use of suitable
standard solutions.
Note
The TresCon NOx-N continues to measure outside the measuring
range, although with lower accuracy. A note appears on the display.
Measuring principle 4-wavelength photometric process
Measuring method Individual absorption of nitrate/nitrite
Measuring ranges mg/l µmol/l
NOx-N 0.1 - 60.0 0 - 4000
NOx 0.1 - 250 0 - 4000
Resolution Resolution Range
mg/l NOx-N 0.1 mg/l 0.1 ... 60.0 mg/l
Resolution Resolution Range
mg/l NOx 0.1 mg/l 0.1 ... 99.9 mg/l
1 mg/l 100 ... 250 mg/l
Resolution Resolution Range
µmol/l
NOx-N / NOx 1 µmol/l 0 ... 4000 µmol/l
Measuring
accuracy Absolute error ± 2 % of measured value
± 0.4 mg/l NOx-N
Process variation coefficient 2 %
Response time Approx. 30 seconds
(after a change in concentration at the input)
Measuring interval Selectable: Continuous, 5 min, 10 min,
15 min, 20 min, 25 min, 30 min
Type of calibration Automatic zero-point balancing
Fixed factory calibration
Calibration interval Selectable: 1, 2, 3, 6, 12 and 24 hours
Reference time Selectable in 30 min intervals
Measurement
Calibration
(AutoCal)