Waterline N2H4 (Hydrazine)


Process analyzer for the determination of dissolved hydrazine

The WATERLINE N2H4 process photometer can be used for the monitoring and control of the hydrazine concentration in water. Measurement principle is the photometric determination of hydrazine by forming of an Azine compound by reaction with 4-(Dimethylamine)- benzaldehyde.

Main application for the photometer is the monitoring of the hydrazine concentration losed water circuits (e.g. boiler water).

The analyzer consists of a control unit with touchscreen and an analysis unit with measuring chamber, valve, dosing pumps and all required tube connections. The control unit includes a microprocessor which controls the automatic measurement incl. sampling, rinsing, reagent dosing and surveillance of the photodetection system.

  • Automatic measurement incl. self test and drift compensation
  • Easy operation via touchscreen
  • Adjustable limit value and alarm value
  • Programmable analog output (0/4-20 mA)
  • Adjustable break time between two analysis
  • External start/stop of an analysis possible
  • No external calibration required
  • External plug connections (IP65) for alarm relay, limit relay, analysis relay, external start/stop, analog output 0/4-20 mA
  • Multi range power supply (110–230 Volt, 50–60 Hz)
  • Including polycarbonate wall cabinet
Parameter Hydrazine
Description Automatic microprocessor controlled analyzer for the photometric determination of total dissolved hydrazine
Typical Applications Control of hydrazin in makeup water for boilers and in closed circuit water for heating systems
Analysis Method: Photometric determination of dissolved hydrazine by reaction with 4-(Dimethylamine)-benzaldehyde
Analyzer type WATERLINE N2H4
Measuring Range 0,05 – 1,00 ppm
Resolution 0,01 ppm
Accuracy 2 % of end value
Reproducibility 1 % of end value
Zero-point Stability automatic adjustment
Number of Samples 1
Operating Pressure0,1 - 10 bar
Temperature5 - 30 °C
Sample Volume25 ml per analysis (excluding rinsing)
Sample Conditionclear, filtrated
Chemical DemandspH 4 - 8
Drainpressure free into open drain
Storage Temp.0 – 30°C
Usage/analysisappr. 4 ml
Reagent volume500 ml
Suitable forappr. 125 analysis
Cycle (approx.)4 min
Sample interval1 – 99 min or external start/stop