Water Quality AnalyzersTotal Nitrogen (TN) Automatic Analyzers

TN-200 series

TN-200 series of water quality analyzers


Test reagent-free combustion TN analyzer

Total nitrogen automatic analyzers rapidly and accurately perform automatic analysis of total nitrogen content such as in plant wastewater and rivers, in either online or offline.
This analyzers, are based on our track records of online total organic carbon automatic analyzers, has optional dilution functions and built-in stream switching functions in a compact form.
It requires no test reagents, and the sealed combustion system enables it to measure seawater samples, and no waste fluid treatment, high maintainability.


Our TN analyzers support various measurements points, from high concentration to low concentration, such as from wastewater to rainwater, and providing stable measurement.


  • Easy to maintain and manage, without the need for expensive test reagents
  • Unique catalyst design and pre-processing filter ensure stable measurement of samples containing high concentrations, such as suspended matter and seawater samples
  • Built-in 2 to 20x dilution function (optional), can measure up to 4,000 mg/L
  • Measurement for up to 8 streams (optional). Offline measurement is also possible.
  • Lineup of four models to suit individual uses


Shared specifications TN-200 series
Measurement range 0-5~200mgN/L
Measurement mode Online/offline
Measurement cycle From 5 minutes
Measurement method Automatic intermittent sealed combustion infrared NO analysis
Measurement value conversion function Built-in function for converting TN value into TRANS value and displaying it
(conversion value = a+bx, coefficients a and b are customer-defined)
Linearity/repeatability Within ±3% of full scale
Zero/span stability Within ±3% of full scale/day
Ambient temperature change Within ±3% of full scale/5 deg
Measurement value output DC 4 to 20 mA (load resistance: 0 to 500 Ω)
Transmission output USB (options: RS-232C, RS-485)
Input signal Non-voltage contact, DC24V
Items: External link, stop measurement, release alarm
Output signal Non-voltage contact, AC 125 V 1 A (resistance load)
Maintenance in progress signal, power failure signal, external pump signal, count signal, selectable output
Abnormal measurement value (selectable output) Upper upper limit, upper limit, lower limit, lower lower limit
Device error (selectable output) Abnormal temperature, sample supply interrupted, pipe cleaning fluid supply interrupted (can be assigned as desired for major/minor failures)
(Options: Gas pressure drop, test reagent supply interrupted, cleaning fluid supply interrupted)
Other options Recording meter, automatic calibration function, separate printer, electrical component air purge, load amount calculation unit
Sample conditions ACF inlet: 0.05 to 0.15 MPa, 3 L/min or greater, 1 to 50°C
ACF inlet: 0.05 to 0.15 MPa, 3 L/min or greater, 1 to 50°C
(Device inlet: 0.02 to 0.1 MPa, 500 mL/min or greater, 1 to 50°C)
Offline sample amount 200 to 500 mL/3 measurements
Test reagent None 
  • 2 mol/L-HCL required when adding test reagent during pipe cleaning
Cleaning fluid Distilled water
Reverse cleaning water 0.1 to 0.4 MPa flow: 3 to 5 L/min, 1 to 50°C
(do not use reverse cleaning water which contains organic carbon or detritus, etc., or which chemically reacts with samples)
Pipe cleaning water 0.02 to 0.05 MPa, 0.4 to 0.6L/min, 1 to 50°C
(do not use water which contains organic carbon or detritus, etc.)
Carrier gas 0.3 MPa instrumentation compressed air, approx. 7 Nm3 /month
(CO2elimination filter is required, and the instrumentation compressed air cannot contain moisture or oil)
Power AC 100 V±10 V, 600 VA, power consumption: Approx. 350 W (multistream model: 450 W)
Installation location Indoors 1 to 40°C (avoid environments with corrosive gasses such as hydrogen sulfide)
External dimensions/weight 550 mm (W) ×538 mm (D)×1430 mm (H)mm(not including 70 mm casters),  Approx. 110 kg
Anchor mounting dimensions 4-φ13 510 mm (W) ×457 mm (D)
Service area Front, left, and right sides 600 mm (not needed for rear side)
Individual model specifications TN-200S TN-200SD TN-200M TN-200MD
Stream switching 1 stream 1 stream Up to 8 streams Up to 8 streams
Dilution function None 2 to 20x None 2 to 20x
Number of selectable outputs 8 8 16 16
Measurement mode Cycle measurement, random measurement
Multistream input signal Per-stream measurement start signal input
Multistream output signal Per-stream abnormal measurement value signal output

Automatic cleaning filter

Our automatic cleaning filters, developed in-house, are sample filtration preprocessing devices which consist of net-less elements made up of stacked circular disks and cleaning blades. The ACF element component uses a roughly 100 gauge net (equivalent to 147 μm) to catch matter suspended in samples.

The suspended matter is scraped off by the cleaning blades, washed off by the flow of excess sample, and evacuated via the drain.

Options such as a reverse cleaning function using cleaning water and functions for controlling element pass-through time are also available to reduce the amount of element clogging.


  • East Japan : +81-3-5962-9775

    West Japan : +81-77-544-6224