The HI96735 Total Hardness EPA Portable Photometer combines accuracy and ease of use in an ergonomic, portable design. Using the HI93735-01 ready made reagents a user can accurately determine the total hardness concentration in samples within a low, medium, and high range. The low range measures from 0 to 250 mg/L CaCO3, the medium range measures from 200 to 500 mg/L CaCO3, and the high range measures from 400 to 750 mg/L CaCO3. Users can simply choose the appropriate range depending on their expected sample concentration. The HI96735 offers many advanced features including the exclusive CAL Check™ function used for performance verification and calibration of the meter.
The HI96735 portable photometer is for the measurement of total hardness. 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.
CAL Check™ – Allows for performance verification and calibration of the meter using NIST traceable standards.
GLP – Review of the last calibration date.
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 left on.
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.
Cooling lamp indicator – To maintain the desirable wavelength to be used for absorbance, it is necessary to ensure components are not overheated from the heat generated by the tungsten lamp. Each photometer is designed to allow a minimal amount of time for components to cool. The cooling lamp indicator is displayed prior to a reading being taken.
Units of measure – Appropriate unit of measure is displayed along with reading.
Total hardness refers to the presence of magnesium and calcium. Hardness from magnesium and calcium is due mainly to runoff water dissolving these salts as it flows or filters through different layers of strata. Hardness can also cause scaling of pipes in cooling and heating systems.
The HI96735 uses an adaptation of the EPA recommended method 130.1 to measure total hardness concentrations ranging from 0 to 750 mg/L (ppm) as CaCO3. When the reagent is added to samples containing magnesium and calcium, the sample will turn a red-violet 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 total hardness determination, a narrow band interference filter at 466 nm (blue) allows only blue 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 HI96735 is available as a kit which includes:
- Portable Photometer
- Sample cuvettes (2)
- CAL Check™ standards with certificate
- Cuvette cleaning cloth
- Rugged carrying case
- Carrying case has thermoformed insert for meter and accessories
*Reagents ordered separately
CAL Check™ standards with certificate
The HI96735-11 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