HI96751 Sulfate Portable Photometer

The HI96751 portable photometer is for the measurement of sulfate. Hanna’s portable photometers feature an advanced optical system; the combination of a light emitting diode, 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 – 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.

Sulfate is widely present within natural waters in different concentrations. Sulfate concentration is to be kept within a strict range for drinking water, especially since this value can be high near mine drainage points. Sulfate is also rigorously tested in the production of beverages such as beer, due to its significant effect upon odor and taste.

The HI96751 uses an adaptation of the turbidimetric method to measure sulfate concentrations of less than 150 mg/L (ppm). When the reagent is added to a sample containing sulfate, it will cause turbidity in the sample; the greater the concentration, the greater the color and turbidity change. 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 sulfate determination, a narrow band interference filter at 466 nm (blue) allows only yellow-green light to be detected by the silicon photodetector and omits all other visible light emitted from the LED. As the change in color of the reacted sample increases, absorbance of the specific wavelength of light also increases, while transmittance decreases.

The HI96751 is available as a kit (HI96751C) 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 with certificate

The HI96751-11 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