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SKU HI97728 Category

Nitrate Portable Photometer - HI97728

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These portable photometers are designed with an innovative optical system that offers superior performance in accuracy, repeatability, and the amount of time that it takes to do a measurement.

These waterproof meters are extremely user friendly with a tutorial mode that walks the user graphically, step by step, in performing a measurement. The use of a backlit dot matrix LED allows the use of virtual keys making operation of the meter very intuitive.

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5 in stock

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Advanced Optical System

  • LED that generates no heat
  • 8 nm narrow band interference filter that is accurate to ±1 nm and offers 25% increase in light efficiency.
  • Reference detector that modulates the voltage to LED for consistent light output.
  • A concave focusing lens that reduces errors from imperfections in the cuvette

High Efficiency Light Source

LED light sources offer superior performance compared to tungsten lamps. LEDs have a much higher luminous efficiency, providing more light while using less power. They also produce little heat, which could otherwise affect electronic stability. LEDs are available in a wide array of wavelengths, whereas tungsten lamps have poor blue/violet light output.

High Quality Filters

Improved optical filters ensure greater wavelength accuracy and allow a brighter, stronger signal to be received. The end result is higher measurement stability and less wavelength error.

Stable Light Source

The internal reference system of the these photometers compensates for any drifts due to power fluctuations or ambient temperature changes. With a stable source of light the readings are fast and stable between your blank (zero) measurement and sample measurement.

Greater Light Yield

A focusing lens collects all of the light that exits the cuvette, reducing errors from imperfections and scratches that may be present in the glass. The use of the convex lens reduces the need for indexing cuvettes.


  • Advanced LED optical system
    • LEDs have a much higher luminous efficiency, providing more light while using less power. They also produce little heat, which could otherwise affect electronic stability.
  • CAL Check™
    • Validate the performance of the instrument at any time and apply a user calibration using CAL Check cuvettes made with NIST traceable standards. The CAL Check screen guides the user step-by-step through the validation process and user calibration
  • Auto logging
  • GLP
    • Review of the last calibration date.
  • On-screen tutorial mode with animations
    • The built in Tutorial mode guides users step-by-step through the measurement process.
  • Waterproof and floating IP67 case
  • Auto-shut off
    • Automatic shut off after 15 minutes of inactivity and 30 minutes before a read measurement.
  • Battery status indicator
    • Indicates the amount of battery life left.
  • Built-in timer
    • Display of time remaining before a measurement is taken. Ensures that all readings are taken at the appropriate reaction intervals for the test being performed.
  • Error messages
    • Messages on display alerting to problems including no cap, high zero, and standard too low.
  • Units of measure
    • Appropriate unit of measure is displayed along with reading.




0.0 to 30.0 mg/L (as NO₃-N)


0.1 mg/L

Accuracy @25°C (77°F)

±0.5 mg/L ±10% of reading at 25°C


Adaptation of Cadmium Reduction method

Measurement System

Light Source

light emitting diode

Bandpass filter

525 nm

Bandpass filter bandwidth

8 nm

Bandpass filter wavelength accuracy

±1.0 nm

Light Detector

silicon photocell

Cuvette type

round 24.6 mm diameter (22 mm inside)

Additional Specifications

Auto logging

50 readings


128 x 64 pixel B/W LCD with backlight


after 15 minutes of inactivity (30 minutes before a READ measurement)

Battery type / Life

alkaline 1.5 V AA (3) / > 800 measurements (without backlight)


0 to 50°C (32 to 122°F); 0 to 100% RH, non-serviceable


142.5 x 102.5 x 50.5 mm (5.6 x 4.0 x 2.0″)


380 g (13.4 oz.)

Ordering information

HI97728 is supplied with sample cuvettes (2), sample caps (2), plastic stoppers (2), 1.5V AA batteries (3), instrument quality certificate and instruction manual.

CAL Check standards and testing reagents sold separately

HI97728C includes photometer, CAL Check cuvette A, CAL Check cuvette B for nitrate, sample cuvettes (2), sample caps (2), plastic stoppers (2), 1.5V AA batteries (3), cuvette wiping cloth, scissors, instrument quality certificate, instruction manual and HI7101412 rigid carrying case.

Reagents sold separately

Reagents and Standards


HI97713-11 CAL Check standard cuvettes for nitrate

HI93728-01 nitrate reagent (100 tests)

HI93728-03 nitrate reagent (300 tests)

Additional Informations

Additional information

Specific parameter

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