General Sensor Information - Hach NO3D sc User Manual

General Information

2.2 General sensor information

1 Sensor cartridge
2 Locking ring
1 Salt bridge
2 Membrane for chloride
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The sensor was developed for use in municipal waste water
applications.
The NO3D sc sensor (see
sensor) is a continuous online process sensor for the measurement of
nitrate directly in the tank. It operates without reagents and requires no
further processing of the sample. The nitrate ions are measured using
an ion-selective electrode.
The only wear part is the sensor cartridge (see
(Catalog Number 6188401). This includes the ion-selective electrodes
for nitrate and chloride (compensation electrode), a pHD electrode
used as a reference system and a temperature sensor for temperature
compensation.
An optional cleaning unit is designed for automatically cleaning the
sensor head membranes and can be ordered separately. Refer to the
instruction sheet supplied with the cleaning unit.
The manufacturer recommends the use of the High Output Air Blast
system for the compressed air supply; this is a compressor in
weather-proof plastic housing
Figure 2 NO3D sc sensor
3 Sensor adapter
4 Sensor housing
Figure 3 Sensor cartridge
3 Temperature sensor
4 Membrane for nitrate
Figure 2) with ion-selective electrode (ISE
Figure 3 on page
.
8)