TPNA-500 Automatic Total Nitrogen/Phosphorus Monitoring

Automatic Total Nitrogen/Phosphorus Monitoring


More than 10 years have passed since the 5th Water Use Regulation was enforced in 2001. From the perspective on preservation of ambient water quality, it has become a matter of course for companies to be compliant with regulations and observe corporate compliance. Total nitrogen and total phosphorus monitoring in the future has the potential to lead to proactive enhancement of corporate value, in addition to compliance with regulations. While we propose technological innovations and improvements and LCC*1 reductions, we will pursue the future where regulations are strictly observed and corporate value is improved through monitoring.

Reduction in Life Cycle Cost (LCC)


Division: Water Pollution
Manufacturing Company: HORIBA Advanced Techno Co., Ltd.


  • Adoption of stain resistant measurement system
    While adopting a reduced reagent volume (1/10) realized by our conventional
    model, employing a new measurement method (meniscus measurement
    method) and enhanced automatic washing functions (optional) have been
    achieved, contributing to lengthening the maintenance cycle.
  • Reduction in power consumption by approximately 30%,
    and pure water and waste water to 1/2

    We have reduced the cost for electricity, use of pure water and waste water
    treatment (including labor) as well as environmental burden (as compared
    with our conventional product).
  • A variety of washing functions
    sampling point backwash purge function,
    line washing function during reagent change, automatic sample line
    washing function*2
  • Ultraviolet oxidation decomposition method
    Domestic market share of approximately 60%. No. 1 in the industry*3
  • Color touch panel
    Improved visibility and operability.
  • A built-in load volume operation function
  • USB data output port

*1_Life Cycle Cost (LCC): Total cost required from purchase to disposal of a product. Total sum of product cost, installation cost, utility cost (electricity and water), running cost (reagent, waste water treatment, parts and man-hours), maintenance cost (regular overhauls and irregular man-hours), dismantling cost, disposal cost, etc.
*2_Hydraulic acid washing is optional.
*3_As of November, 2013. Based on our company's research.


Equipment nameAutomatic total nitrogen/phosphorus monitoring system
Dimensions *1460 (W) mm × 385 (D) mm × 1600 (H) mm
MassApprox. 87 kg
Power supply100 V to 240 V AC ±10%, 50 Hz/60 Hz
Power consumption100 V to 240 V AC: Approx. 250 VA
range *2
Total nitrogen: 0 mg N/L to 2/5/10/20/50/100/200/500/1000 mg N/L
Total phosphorus: 0 mg P/L to 0.5/1/2/5/10/20/50/100/250 mg P/L
RepeatabilityWithin ±3% of the full scale
(Total nitrogen full scale: 50 mg N/L or less, total phosphorus full scale: 10 mg P/L or less)
Within ±5% of the full scale
(Total nitrogen full scale: 100 mg N/L to 1000 mg N/L, total phosphorus full scale: 20 mg P/L to 250 mg P/L)
Both with standard solution
Total nitrogen: Alkaline potassium persulfate, ultraviolet oxidative dissolution -
ultraviolet absorption spectrophotometry
Total phosphorus: Potassium persulfate, ultraviolet oxidative dissolution -
Molybdenum blue spectrophotometric method
Number of
One point (standard), two points (option)
Number of
ranges *3
One range (standard), 2 ranges (option)
60 min
2℃ to 40℃
Ambient humidityRelative humidity 85% or less (no condensation)
  • Indoor installation type
  • Transient overvoltage of main power supply: Overvoltage Category II (EN61010- 1), Pollution Degree 2
  • Flat surface that is not subject to vibration and external shock
  • No dust, mist, or corrosive gas is present in the atmosphere
  • Under atmospheric pressure
  • No direct sunlight
  • Well-ventilated area
Sample water
*4, *5, *6,*7
Temperature2℃ to 40℃ (no freezing)
Flow rate 
  • 0.5 L/min to 5 L/min (when OF-3 is used)
  • 5 L/min to 20 L/min(when OF-30 is used)
Pure water/tap
water supply
Amount of usage43 L/month (depending on the measurement range)
Water quality 
  • When the customer supplies pure water, use the water of class
    A2 or above, as specified in JIS K0557: 1998, which does not contain nitrogen and phosphorus compounds.
  • When a pure water unit is used, the tap water criteria defined by the Water Supply Act must be met.
Supply methodSupply by the tank (standard) or continuous supply by the pure water equipment (option)
Supply pressure0.1 MPa to 0.5 MPa
Analog outputNumber of
Standard: 4 points
Option (3-component specification/2-point meter specification): 8 points
TypeStandard: 4 mA to 20 mA DC, 0 mA to 16 mA DC
(Set to 4 mA to 20 mA DC at the factory. It can be switched to 0 mA to 16 mA DC from the screen.)
Option: 0 V to 1 V DC, 1 V to 5 V DC
DescriptionStandard: TN concentration, TP concentration, TN load, TP load, flow rate per hour
Option (3-component specification): COD concentration, COD load, COD instantaneous concentration
Note: The COD output settings depend on the equipment
500Ω or less
Contact outputNumber of
Standard: 16 points
Option (3-component specification/2-point meter specification): 22 points
TypeNo-voltage output contact
FormIsolated output
Output capacity250 V AC 3 A
30 V DC 3 A (Only 30 V DC 3 A is available for the “Maintenance” contact)
Status outputMeas., Calibration, Standby, Maintenance, SYNCHRONOUS IDLE
1, SYNCHRONOUS IDLE 2, Power, etc.
Alarm outputHi limit alarm (TP, TN, COD), H.Hi limit alarm (TP, TN, COD), Load limit alarm (TP, TN, COD), Sample Lack, Lack Blank, Lack Reag.,
Lack Span, Full Drain Tank, Total Alarm 1 to 6, various meter errors, etc.
Analog inputNumber of
Standard: 1 point
Option (3-component specification/2-point meter specification):
2 points
TypeStandard: 4 mA to 20 mA DC
Option: 1 V to 5 V DC
DescriptionFlow rate (full scale can be set as desired), UV/COD meter
Contact inputNumber of
Standard: 9 points
Option (3-component specification/2-point meter specification): 18 points
TypeNo-voltage a contact input (open collector is available)
FormIsolated input: Common to the (-) side
ON resistance100 Ω (max.)
26 V DC (max.)
13 mA DC (max.)
FunctionMeas. Start, Cal. Start, Modify Date, Line Select,
Flow Mainte, Flow Err., Flow Power, Flow No Drain,
UV/COD Mainte, UV/COD Err., UV/COD Power, etc.
DisplayTouch panel type liquid crystal (color)
Load calculation functionStandard: TP/TN load calculation function is provided
Option: COD and 2-point meter load calculation function are provided
OptionTurbidity compensation function is provided (TN)
(Turbidity compensation wavelength: 275 nm)
Memory functionMeasurement value: Memory for over 1 year (including the daily and hourly reports)
Alarm history: 500 events
Calibration history: 100 events
Operation history: 100 events
Note: USB external memory device can be used.
Communication functionStandard: RS-485
Option: RS-232C
Communication protocolModbus
PrinterProvided (recording paper width: 58 mm) With automatic take-up equipment
ReagentReagent A0.8 mL per measurement (capacity: 1000 mL)
Solution B0.2 mL per measurement (capacity: 250 mL)
Solution C0.1 mL per measurement (capacity: 250 mL)
Solution D0.1 mL per measurement (capacity: 250 mL)
Solution E0.19 mL per measurement (capacity: 250 mL)
Solution F0.2 mL per measurement (capacity: 250 mL)
Span solution50 mL per measurement (capacity: 1000 mL)
Replacement cycleOne month (only under certain storage/usage environment)

*1:  Compatible with older products: Model TPNA-300, PN-100 series channel base (standard)
*2:  Full-scale values for both total nitrogen and total phosphorous must be greater than or equal to 0.2 and less than or equal to 100
*3:  When the first range is set to low concentration, the following condition must be met for the same measurement component:
    1 ≦ Second range full scale/first range full scale ≦ 50
*4:  The chemical cleaning function for the sample line can be selected according to the nature of the sample
*5:  The provided overflow tank can be installed in either the left/right side or rear of the main unit
*6:  The distance from the provided overflow tank to the main unit should be within 1 m
*7:  The sample must not contain the components that could affect the measurement (metallic ions, etc.)
*8:  When tap water is supplied, flush the pipes by running the water for approximately 30 minutes before supplying.


Perform the installation work while taking the features of the analyzer into consideration. Also, ensure an environment in which the equipment can operate normally. If the equipment is not operating normally due to impairment, operating conditions, or other unexpected events, take appropriate action so that no damage to the equipment will occur.

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