Phosphorus Portable Photometer - HI96706

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Phosphorus Portable Photometer - HI96706


The HI96706 Phosphorus Photometer combines accuracy and ease of use in an ergonomic, portable design. Using the HI93706-0 ready-made reagents a user can accurately determine the concentration of phosphorus within a 0.0 to 15.0 mg/L (ppm) range. The HI96706 offers many advanced features including the exclusive CAL Check function used for performance verification and calibration of the meter.

CAL Check Validation and Calibration

Built-in Timer

Automatic Shut Off


The HI96706 portable photometer is for the measurement of phosphorus. Hanna's portable photometers feature an advanced optical system; the combination of a special tungsten lamp, a narrow band interference filter, and silicon photodetector ensure accurate photometric readings every time. The Hanna exclusive CAL Check feature utilizes ready-made, NIST traceable standards to verify both meter validation and calibration. The exclusive cuvette locking system ensures that the cuvette is inserted into the measurement cell in the same position every time to maintain a consistent path length.


Features at-a-glance

CAL Check - Allows for performance verification and calibration of the meter using a CAL Check NIST traceable secondary standard.

GLP - Records the date of the last user calibration performed.

Built in timer - Allows the use of a timer to ensure the appropriate 3 minutes and 30 seconds reaction time is used for the chemical reaction. At the end of the timer countdown the meter will automatically take the reading. This feature ensures consistency across multiple users.

Indexing indent on meter - The meter has an indent that allows for a lock and key fit with the cuvette cap. This ensures that the cuvette is indexed consistently (same position) in order to maintain the same path length for accurate results.

Cooling Lamp Indicator - It is necessary to maintain a consistent temperature of the optical components in order to maintain a narrow wavelength band of light. This photometer has a cooling lamp indicator that is displayed for a short period of time before each measurement in order to allow the components to cool and obtain the highest accuracy possible.

Error messages - Messages on display alerting to problems including no cap, over range and under range readings, and light source error.

Auto-shut off - Automatic shut off after 10 minutes of non-use when the meter is in measurement mode. Prevents wastage of batteries in the event the meter is accidentally not turned off.

Battery status indicator

The instrument has a battery level indicator to display reaming life as follows:

• 3 lines for 100 % capacity

• 2 lines for 66 % capacity

• 1 line for 33 % capacity

• Battery icon blinks when the capacity is less than 10 %.

Units of measure - Appropriate unit of measure is displayed along with reading.


optical system

Common in natural systems, such as lakes, oceans, and soil, phosphorus is an essential element for plant and animal growth. However, when present in large concentrations, phosphorus can cause excessive microorganism and algae growth. For hobbyists with saltwater aquaria, a high amount of phosphorus can problematic to fish and coral. The main source of phosphorus in reef aquaria is through food that is introduced on a daily basis, but it is also produced through the breakdown of plant material and excretion from fish. Replacement water can also be a source of phosphorus in aquaria, where tap water or reverse osmosis water is used to replace evaporated water and control the salt concentration in tanks. Both forms of water contain phosphorus, albeit in varying concentrations, and will have negative effects if the accumulating levels are not controlled. Phosphorus is also responsible for corrosion for corrosion of piping systems if present in high enough amounts.

The HI96706 uses an adaptation of the Standard Method for the Examination of Water and Wastewater, Amino Acid method to measure phosphorus concentrations of less than 15.0 mg/L (ppm). When the reagent is added to samples containing phosphorus, the sample will turn a blue hue; the greater the concentration, the deeper the color. The associated color change is then colorimetrically analyzed according to the Beer-Lambert Law. This principle states that light is absorbed by a complementary color, and the emitted radiation is dependent upon concentration. For phosphorus determination, a narrow band interference filter at 525 nm (blue-green) allows only blue-green light to be detected by the silicon photodetector and omits all other visible light emitted from the tungsten lamp. As the change in color of the reacted sample increases, absorbance of the specific wavelength of light also increases, while transmittance decreases.


The HI96706 is available as a kit (HI96706C) which includes:

  • Portable Photometer
  • Sample cuvettes (2)
  • Caps
  • CAL Check™ standards with certificate
  • Cuvette cleaning cloth
  • Scissors
  • Rugged carrying case
    • Carrying case has thermoformed insert for meter and accessories
*Reagents ordered separately
cal check standards

CAL Check™ standards with certificate

The HI96706-11 CAL Check standards are used for calibration and performance verification of photometers with the CAL Check function.

Supplied with Certificate of Analysis
  • Lot number
  • Expiration date
  • Standard value @ 25 °C
  • Reference meter NIST traceable
Provided storage containers
  • Light tight
  • Protects from accidental breakage
photometer steps
Nitrite Range 0.000 to 0.600 mg/L (ppm)
Nitrite Resolution 0.001 mg/L
Nitrite Accuracy ±0.020 mg/L ±4% of reading
Nitrite Method adaptation of the EPA approved Diazotization method 354.1
Photometer/Colorimeter Light Source tungsten lamp
Photometer/Colorimeter Light Detector silicon photocell with narrow band interference filter @ 525 nm
Battery Type/Life 9V battery
Automatic Shut-Off after ten minutes of non-use in measurement mode; after one hour of non-use in calibration mode; with last reading reminder
Environment 0 to 50°C (32 to 122°F)
Weight 360g (12.7oz.)
Dimensions 193 x 104 x 69 mm (7.6 x 4.1 x 2.7”)
Ordering Information HI96707 is supplied with sample cuvettes (2) with caps, 9V battery, instrument quality certificate and instruction manual.