Analyzer module for nitrite determination

Description:
Analyzer module for integration in a TresCon system for continuous online analysis 
of nitrite and nitrite nitrogen in aqueous solutions. 

Instrument designed according to recommendations of the ATV bulletin M 269.

Performance features of the entire instrument:
- Protective low voltage in the area of the entire analyzer module
- Full text display of all instrument information and messages
- Menu-guided support of all maintenance and service functions
- Automatic 2-point calibration with freely selectable calibration intervals and times
- Automatic plausibility check of the calibration values
- Automatic system cleaning with freely selectable cleaning intervals and times
- Low maintenance costs
- High accuracy and reproducibility of measured values
- High long-term stability
- Freely selectable measuring intervals for optimum adjustment of reagent consumption
- Fixed intervals from 10 min to 30 min selectable
- Interval program for minimum consumption of chemicals 
- Gradient evaluation for automatic adjustment of the measuring interval to the 
measured value change in the sample
- Automatic service and maintenance instructions
- Automatic background correction for optimum adjustment to sample-specific colorations
- Comprehensive monitoring of the filling levels and chemicals transport of the instrument 
- Reagent monitoring
- Monitoring of the sample and standard flow
- Monitoring for lack of permeate and blockage
- Temperature-controlled reference beam optic module with highest reproducibility 
and accuracy of measured values and short reaction time

Measuring principle:
Photometric reference beam method according to the azo dye method 

Measured parameters:
NO2-N (nitrite nitrogen) and NO2 (nitrite) 

Measuring ranges: 
0.005 ... 1.200 mg/l	NO2-N and 0.020 ... 4.000 mg/l NO2(-)

Measuring range extension possible via an external dilution unit (e.g. PurCon).
Automatic taking into account of the dilution.

Measurement accuracy:
Measuring range 1:	< 2%  0.005 of measured value

Process variation coefficient <  2%

Calibration: 
automatic 2-point calibration

Response time: 
(T90) < 5 minutes (till measured value display after concentration change at the sample inlet)

Measuring operation: 
Intervals: 10, 15, 20, 25, 30 min

Sample requirement: 
approx. 0.06 l/h; Total dissolved solids < 50 mg/l

Scope of delivery:
- 1 reagent set for two months operation
- 1 set of wear parts for 1 year
- 1 operating manual

The operation, parameterization, data input and data output as well as the power supply take place
via the system controller. Environmental conditions, test certificates and protective class 
correspond to the basic instrument of the multiparameter analyzer system if the module is installed 
and operated according to regulations.

Manufacturer:
WTW

Type:
ON 510
or equivalent
