• New
    Free and Total Chlorine Portable Photometer

Free and Total Chlorine Portable Photometer

  • CAL Check™ Validation and Calibration
  • Built-in Timer
  • Automatic Shut Off

The HI96711 Free and Total Chlorine Portable Photometer combines accuracy and ease of use in an ergonomic, portable design.

A user can accurately determine the concentration of free and total chlorine in a variety of water samples within a 0.00 to 5.00 mg/L (ppm) range using ready made reagents. The HI93701-0 reagents are used for free chlorine and the the HI93711-0 are used for total chlorine measurements. The HI96711 offers many advanced features including the exclusive CAL Check™ function used for performance verification and calibration of the meter.

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 - Ensures the appropriate reaction time is used for the chemical reaction. At the end of the timer 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.



 As one of the oldest and most common forms of disinfection, chlorine improves water quality by destroying disease-producing microorganisms and by reacting with other organic and inorganic substances. Chlorine levels must be actively monitored to ensure sufficient chlorine is present for disinfection, as well as to control adverse effects such as taste, odor, and potential reactions with organic matter to form harmful disinfection byproducts.

The HI96711 uses an adaptation of the USEPA method 330.5 and Standard Method 4500-Cl G to measure free and total chlorine concentrations of less than 5.00 mg/L (ppm). When the DPD reagent is added to samples containing free chlorine, the sample will turn a pink 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 complimentary color, and the emitted radiation is dependent upon concentration. For free and total chlorine determination, a narrow band interference filter at 525 nm (green) allows only 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 HI96711 is available as a kit (HI96711C) which includes:
  • Portable Photometer
  • Sample cuvettes (2)
  • Caps (2)
  • CAL Check™ standards with certificate
  • Cuvette cleaning cloth
  • Scissors
  • Rugged carrying case
  • Thermoformed insert for meter and accessories

*Reagents ordered separately

















CAL Check™ standards with certificate The HI96711-11 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















Absorbance Specifications

Light Source

tungsten lamp
Light Detector
silicon photocell with narrow band interference filter @ 525 nm

Additional Specifications

Range
0.00 to 5.00 mg/L (ppm)
Resolution0.01 mg/L (ppm) from 0.00 to 3.50 mg/L; 0.10 mg/L above 3.50 mg/L
Accuracy @ 25°C (77°F)
±0.03 mg/L ±3% of reading
Method
adaptation of the USEPA method 330.5 and Standard Method 4500-Cl G
Auto-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); RH max 95% non-condensing
Weight
360g (12.7oz.)
Battery Type
9V battery
Dimensions
193 x 104 x 69 mm (7.6 x 4.1 x 2.7”)
Ordering Information
HI96711 is supplied with sample cuvettes (2) with caps, 9V battery, instrument quality certificate and instruction manual.
Warranty
2 years