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1.0 GENERAL DESCRIPTION
1.0.0 D
ESCRIPTION
The HYDRA-DS Nitrate Analyzer measures the concentration of dissolved nitrate ion as nitrogen (NO
sensor uses two electrodes to determine the NO
An optional pH or Ammonium electrode is available for additional process information. It is designed for use in all kinds
of water. Typical applications include monitoring environmental waters, lakes, streams, and wells as well as wastewater
treatment in aeration basins, sludge digesters, and effluent.
1.0.1 C
I
C
HLORIDE
ON
OMPENSATION
The Nitrate Ion Electrode provides the primary measurement. Any Chloride ion in the sample, due to its similar size,
and charge to the Nitrate ion, causes a positive interference in the measurement. The Chloride Ion Electrode measures
the amount of chloride ion present in the sample and HYDRA-DS Analyzer subtracts the appropriate amount of signal
from the Nitrate Measurement.
1.0.2 O
H
A
PTIONAL P
OR
MMONIUM
An optional pH or ammonium electrode is available in the HYDRA-DS NO3 sensor providing additional information about
the process solution. The HYDRA-DS Analyzer provides an additional 4-20 mA output to transmit this information.
1.0.3 T
C
EMPERATURE
OMPENSATION
Temperature is also measured and used to compensate each of the three electrode measurements. While the pH
electrode response is well defined with respect to temperature, the ion electrode tends to be less well behaved. For
the best results calibrate the sensors near the process temperature.
1.0.4 C
M
LEANING AND
AINTENANCE
The HYDRA-DS Nitrate Analyzer is configured to periodically actuate a cleaning cycle using the integral spray cleaner in
the sensor. The period and duration of the cleaning cycle is user configurable. The 4-20 mA output is held at either the
last value or a preset value during the cleaning. This minimizes the formation biofilms or other coatings on the
electrodes keeping maintenance to a minimum.
The rugged HYDRA-DS sensor has a 1 ¼" NPT rear facing thread for attaching an extension/immersion tube for easy
installation from catwalks or handrails. The HYDRA-DS sensor is submersible with an IP68 degree of ingress protection.
A removable electrode guard facilitates easy electrode replacement when necessary. The HYDRA-DS sensor features
internal signal conditioning that allows the sensor to be mounted up to 200 meters from the analyzer.
HYDRA-DS NO
-N
3
-N concentration, a Nitrate Ion Electrode, and a Chloride Ion Electrode.
3
M
EASUREMENT
-N) in water. The
3
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