HYDRA Ammonium Analyzer - HYDRA NH4-N

• NH4+-N​ Measurement:​ 0.01 to 14,000 ppm
• ​Potassium Measurement:​ 0.01 to 40,000 ppm​
• pH Measurement:​0 to 14 pH​
• Temperature Measurement: 0°C to 100°C (32°F to 212°F)
• Operating Temperature: 0°C to 50°C (32°F to 122°F)
• Response Time: T90 1 minute

  • Model Number: HYDRA NH4-N
  • Data Sheet: Date Sheet File
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  • HYDRA Ammonium Analyzer
  • HYDRA Ammonium Analyzer
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Product Specification

HYDRA NH4-N Ammonium Analyzer Description
The HYDRA® Ammonium Analyzer measures the concentration of dissolved ammonium as nitrogen (NH4+-N) in water. The sensor uses three electrodes to determine the NH4+-N concentration, an Ammonium Ion Electrode, a Potassium Ion Electrode and a pH Electrode. 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 and effluent.

The Ammonium Ion Electrode provides the primary measurement. Any potassium ion in the sample generates a positive interference in the measurement, due to its similar size and charge to the ammonium ion. A Potassium Ion Electrode measures the amount of potassium ion present in the sample and HYDRA C22 Analyzer subtracts the appropriate amount of signal from the Ammonium Measurement.

HYDRA NH4-N Ammonium Analyzer Features
• Ammonium ISE electrode
• K+, pH and Temp. electrodes
• Rugged PVC design
• Integral Spray Head Cleaner
• Internal Signal Conditioning

HYDRA NH4-N Ammonium Analyzer Benefits
• Fast and Accurate Ammonium
• Measurement NH4+ or NH4+-N
• Fully compensated for pH, K+ interferences & Temperature
• Removable electrode guard for easy maintenance
• Clean sensor in situ with pressurized water or air
• Amplified signals allow up to 200 meters between Sensor and Analyzer

HYDRA NH4-N Ammonium Analyzer Specifications

Three Electrode system with spray cleaner, Ammonium ISE (NH4+-N) 
is the primary measurement. The Potassium ISE and pH glass electrodes 
are used to compensate the NH4+ signal. The Sensor is waterproof 
with an ingress rating of IP 68.
Measurement Range
NH4+-N: 0.1 to 14,000 ppm
Operating Temperature
0°C to 50°C (32°F to 122°F)
Min/Max Flow Rate
Minimum 0.1 m/s
Maximum 3.0 m/s
We&ed Materials
PVC, PES, PVDF, PTFE, Viton, Glass, 316 SS
± 3% of reading, dependent on Calibration
Response Time
T90 1 minute
Electrode Life
ISEs: 4- 6 months, typical
pH electrode: 6-12 months, typical
C22 Analyzer

0.01 to 14,000 ppm as NH4+-N
0.01 to 40,000 ppm
0 to 14 pH
0°C to 100°C (32°F to 212°F)

4 - 10 pH
0.1 to 1000 ppm
2.5" X 1.75" backlit LCD, 4 lines of Text & Graphical
NEMA 4X, L x W x D: 5.7" x 5.7" x 7
(2) 4-20 mA maximum load 800 ohms @ 24 VDC
Configured: 0.1 to 20 mg/l NH4+-N; 0 - 14 pH
Optionally up to (4) 4-20 mA outputs*
Input Power
110/220 VAC @ 50/60 Hz
Alarm Relay Ra%ngs
(2) SPDT 230 VAC/5A or 30 VDC/5A resistive max.
Relay(1) Spray Cleaner, Relay(2) Alarm
Optionally up to (8) Relays*

Part No.
Model and Product Description
HYDRA® NH4-N Sensor, complete, NH4, K+, pH, Temp, Spray Cleaner head and 30 #. cable
HYDRA® NH4-N Sensor, complete, NH4, pH, Temp, Spray Cleaner head and 30 #. cable (No K+ Sensor)
HYDRA® C22 NH4-N Analyzer, K+ compensated, (2) 4-20 mA output, 0.1 - 20 ppm NH4-N and (2) relays*
HYDRA® C22 NH4-N Analyzer, (2) 4-20 mA output, 0.1 - 20 ppm NH4-N and (2) relays* (No K+ compensation)

Part No.
Spare Parts and Accessories Description
Ammonium Electrode Cartridge (recommended spare)
Potassium Electrode Cartridge (recommended spare)
pH Electrode Cartridge (recommended spare)
Replacement Spray Nozzle
PVC Front Sensor Guard
Ammonium Calibration solution, NH4-N 1 ppm
Ammonium Calibration solution, NH4-N 100 ppm
Potassium Calibration solution, 1 ppm
Potassium Calibration solution, 100 ppm
pH 4 Buffer Calibration solution
pH 7 Buffer Calibration solution
4-20 mA USB Data Logger

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