Applications

• Wastewater
• Drinking Water

NT3 Series UV Nitrate

and Nitrite Sensors

The Power of Two: Nitrate and Nitrite in One

Improve your experience in nitrate and nitrite measurement with Hach’s new NT3 Series sensors.
Backed by a legacy of reagent-free UV absorbance technology expertise, Hach’s NT3100sc UV Nitrate
and NT3200sc UV Nitrate and Nitrite Sensors are equipped to meet your unique application needs.
Whether measuring nitrate and nitrite in municipal sewage treatment plants, surface water, untreated
water or treated drinking water, you’ll have the choice of 3 different path lengths to fit your measurement
ranges and turbidity compensation needs.

No time for downtime Hach service and support—there when

Make your best process decisions to ensure water quality when you need us
you have reliable and real-time data. The Hach® NT3100sc For nearly a century, Hach has been a leader in water quality
and NT3200sc use internal smart sensors to proactively alert analysis. Backed by a legacy of UV absorbance technology
you of potential measurement issues so you have confidence expertise, our Technical Support, Field Service, and Central
in your process health. We’ll help you reduce time spent on Service Teams work together to help you maximize instrument
troubleshooting, validations, and avoid unplanned equipment uptime, ensure data integrity, maintain operational stability,
downtime. and reduce compliance risk.
Optimize your process with smart decisions
The NT3100sc UV nitrate sensor features improved accuracy and
low-level detection to help you optimize your plant performance
and ensure regulatory compliance now and into the future. The
NT3200sc UV sensor comes with dual parameters of nitrate
and nitrite when measuring both independently is needed.
Hach’s proven wiper technology keeps your system clean and
our enhanced one-step, tool-free, wiper replacement reduces
maintenance and improves your experience.
2 NT3 Series UV Nitrate and Nitrite Sensors

Technical Data*
Model NT3100sc UV Nitrate Sensor
Path Length 1 mm 2 mm 5 mm
Measuring range1 0.1 - 90 mg/L NO3-N 0.05 - 50 mg/L NO3-N 0.02 - 25 mg/L NO3-N
Lower Limit of
0.1 mg/L NO3-N 0.05 mg/L NO3-N 0.02 mg/L NO3-N
Detection (LOD)
± 4% of reading ± 0.1 mg/L NO3-N ± 3% of reading ± 0.1 mg/L NO3-N
from 0.05 - 22 mg/L, from 0.02 - 13 mg/L,
Accuracy2 ± 5% of reading ± 0.1 mg/L NO3-N
± 5% of reading ± 0.1 mg/L NO3-N ± 5% of reading ± 0.1 mg/L NO3-N
from 22 - 50 mg/L from 13 - 25 mg/L
Model NT3200sc UV Nitrate and Nitrite Sensor
Path Length 1 mm 2 mm 5 mm
0.3 - 70 mg/L NO3-N; 0.15 - 34 mg/L NO3-N; 0.07 - 17 mg/L NO3-N;
Measuring range1,2
0.4 - 92 mg/L NO2-N 0.15 - 61 mg/L NO2-N 0.06 - 23 mg/L NO2-N
Lower Limit of
0.3 mg/L NO3-N; 0.4 mg/L NO2-N 0.15 mg/L NO3-N; 0.15 mg/L NO2-N 0.07 mg/L NO3-N; 0.06 mg/L NO2-N
Detection (LOD)2
± 4% of reading ± 0.6 mg/L NO3-N, ± 3% of reading ± 0.3 mg/L NO3-N, ± 3% of reading ± 0.1 mg/L NO3-N,
Accuracy2
± 4% of reading ± 0.6 mg/L NO2-N ± 3% of reading ± 0.2 mg/L NO2-N ± 5% of reading ± 0.24 mg/L NO2-N
1) Not expressed for mixed NOx concentration. Measured with NO3-N for NT3100sc and NO3-N/NO2-N for NT3200sc standard solutions.
2) Measured in lab conditions.

General - NT3100sc and NT3200sc

Measuring Principle UV absorption measurement, reagent-free
Resolution 0.01 - 999.9
Sludge Compensation Yes
Measuring Interval 15, 30 seconds, 1, 5, 10, 30 minutes
Response Time T100: 1 minute
10 m (33 ft)
Cable Length
Extension cables are available: 5, 10, 15, 20, 30 and 50 m. The maximum cable length is 60 m (190 ft).
IP Rating IP68
Pressure Range Sensor pressure limit: 0.5 bar
Ambient Temperature 2 - 40 °C (36 - 100 °F), 95% relative humidity, non-condensing
Sample Temperature 2 - 40 °C (36 - 100 °F)
Dimensions 70 x 402 mm (3 x 15.8 inches) approximately
Weight 4.8 kg (10.58 lb) with 10 m cable
Sensor enclosure: Stainless steel
Enclosure seals: Silicone
Wiper axle, arm (5 mm) and wiper blade carrier (1 mm and 2 mm): Stainless steel
Wiper blade: Silicone
Material
Measuring window: Quartz glass
Sensor cable: Polyurethane (PUR)
Cable gland: Stainless steel
Seal cable gland: Silicone HT
Immersion directly in media
Process Connection Bypass with Flow Through Unit
Sedimenter
Certifications CE, CMIM, UKCA, FCC, and ISED approved
Signal Average Time 1 to 12 measurements
Power Consumption 9W
Controller
SC Controller
Compatibility
*Subject to change without notice.
3 NT3 Series UV Nitrate and Nitrite Sensors

Principle of Operation
Nitrate dissolved in water absorbs UV light with wavelengths below 250 nm. The nitrate and nitrite absorption of UV light makes it
possible to photometrically determine the nitrate and nitrite dissolved without reagents. The sensor is put directly in the medium.
The color of the medium does not have an effect on the measurement because the measuring principle is based on the analysis of
invisible UV light.

Dimensions
[mm]

Sensor

Sensor mounting
4 NT3 Series UV Nitrate and Nitrite Sensors

Applications

NT3100sc: General recommendation. Each application needs to be assessed for NOx concentrations and turbidity.

Model: NT3100sc UV Nitrate Sensor

Path Length 1 mm 2 mm 5 mm
Wastewater Application
Influent monitoring ✔ ✔
Process monitoring - Nitrification/Denitrification ✔ ✔
Process monitoring - Nitrification/Denitrification
✔
with sludge concentration >5000 mg SS/L
Effluent ✔ ✔
Drinking Water Application
Raw drinking water ✔ ✔
Finished water/Distribution ✔

NT3200sc: When both nitrate and nitrite are present, the accuracy of NO2-N and maximum NOx-N concentrations are reduced.
The max NO3-N value can vary depending on the UV absorbance of the matrix. Examples of parameters impacting absorbance:
solids, organics, humic acids, and salts (e.g., fluoride). This table is used to help choose the best path length for your conditions.
Contact your local Sales Representative to discuss your specific application.

Model: NT3200sc UV Nitrate and Nitrite Sensor

Path Length 1 mm 2 mm 5 mm
Wastewater Application
● ✔
Process monitoring - Nitrification/Denitrification
(max. 30 mg/L NO3-N) (max. 5-10 mg/L NO3-N)
✔
Process monitoring - Nitrification/Denitrification ●
with filtration
with sludge concentration >5000 mg SS/L (max. 25-30 mg/L NO3-N)
(max. 5-10 mg/L NO3-N)
Process monitoring - Anammox/Nitrification ✔
mainstream (max. 10-30 mg/L NO3-N)
● ✔1 ✔
Effluent
(max. 30-70 mg/L NO3-N) (max. 20 mg/L NO3-N) (max. 5 mg/L NO3-N)
Drinking Water Application (Units in NO3)
● ✔2 ✔3
Finished water/Distribution
(max. 200-300 mg/L NO3) (max. 65-88 mg/L NO3) (max. 22 mg/L NO3)

✔ Suitable application
● Limited accuracy for nitrite
1 Limited accuracy for nitrite with NO3-N values >10 mg/L
2 Limited accuracy for nitrite with NO3 values >80 mg/L
3 Only in low (~0 mAbs/mm) UV absorbance matrix
5 NT3 Series UV Nitrate and Nitrite Sensors

Order Information
Sensors
LXV448.99.11001 NT3100sc UV Nitrate Sensor, 1 mm path length
LXV448.99.21001 NT3100sc UV Nitrate Sensor, 2 mm path length
LXV448.99.51001 NT3100sc UV Nitrate Sensor, 5 mm path length
LXV448.99.12001 NT3200sc UV Nitrate and Nitrite Sensor, 1 mm path length
LXV448.99.22001 NT3200sc UV Nitrate and Nitrite Sensor, 2 mm path length
LXV448.99.52001 NT3200sc UV Nitrate and Nitrite Sensor, 5 mm path length
A Hach SC controller is required to operate the NT3100sc and NT3200sc sensors, controller must be purchased separately.

Accessories and Consumables

LZY714.99.53220 Mounting hardware system with brackets, 90° adapter, stainless steel
LZX869 Flow through unit, 2 mm
LZX867 Flow through unit, 5 mm
LXZ448.99.00002 Wiper blade, 1 mm, pk/5
LXZ448.99.00003 Wiper blade, 2 mm, pk/5
LXZ448.99.00033 Wiper blade, 5 mm, pk/5
LCW943 Nitrate standard, 40 mg/L NO3 (9.04 mg/L NO3-N), 500 mL
LCW825 Nitrate standard, 50 mg/L NO3 (11.3 mg/L NO3-N), 500 mL
LCW944 Nitrate standard, 75 mg/L NO3 (16.9 mg/L NO3-N), 500 mL
LCW945 Nitrate standard, 150 mg/L NO3 (33.9 mg/L NO3-N), 500 mL
LCW963 Nitrite standard, 40 mg/L NO2 (12.2 mg/L NO2-N), 500 mL
LCW964 Nitrite standard, 75 mg/L NO2 (22.9 mg/L NO2-N), 500 mL
LCW966 Nitrite standard, 150 mg/L NO2 (45.7 mg/L NO2-N), 500 mL
Additional Accessories and Consumables are available. Please contact Hach for more information.

This instrument connects to Claros, Hach’s innovative Water With Hach Service, you have a global partner who understands
Intelligence System. Claros allows you to seamlessly connect your needs and cares about delivering timely, high-quality service
and manage instruments, data, and process – anywhere, you can trust. Our Service Team brings unique expertise to help
anytime. The result is greater confidence in your data and you maximize instrument uptime, ensure data integrity, maintain
improved efficiencies in your operations. To unlock the full operational stability, and reduce compliance risk.
potential of Claros, insist on Claros Enabled instruments.

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United States 800-227-4224 fax: 970-669-2932 email: orders@hach.com
Outside United States 970-669-3050 fax: 970-461-3939 email: int@hach.com
©Hach Company, 2022. All rights reserved.
In the interest of improving and updating its equipment, Hach Company reserves the right to alter specifications to equipment at any time. DOC053.53.35333.Oct22