The HI-971044C is delivered in a rugged carrying case and supplied with: • Sample cuvette (2 pcs.) • Sample cuvette cap (2 pcs.) • Plastic stopper (2 pcs.) • A ZERO - CAL Check® Cuvette A • HI-97701B - CAL Check Cuvette B for Free and Total Chlorine (Powder & Liquid) • HI-977794B - CAL Check Cuvette B for pH • HI-97722B - CAL Check Cuvette B for Cyanuric Acid • HI-97775B - CAL Check Cuvette B for Alkalinity • Cloth for wiping cuvettes • Scissors • 1.5V AA Alkaline batteries (3 pcs.) • CAL Check standard certificate • Instrument quality certificate • Instruction manual.

About the HI-971044 photometer

This meter offers a superior optical system that utilises a reference detector and narrow band interference filters for extremely fast and repeatable measurements.

• No warm up time before taking a measurement
• Uses either powder or cost saving liquid reagents
• Tutorial mode for step-by-step instructions

The HI-971044 has an innovative optical system that offers superior performance in accuracy, repeatability, and the short amount of time it takes to perform a measurement. This compact, waterproof meter is 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 which makes the operation of the meter very intuitive including selecting different methods, reviewing GLP data, recalling the last 50 measurements, and customising the meter to user preferences.

HI-971044 is waterproof including the cuvette holder that is designed with ridges to protect the optical path from getting scratched by the cuvette and a protected battery compartment that holds three AA batteries. The compact design fits comfortable in the hand for use in the field or on a table for benchtop use. The LCD is 71 mm (2.75") by 37 mm (1.6") and is backlit for easy viewing under all conditions.

Key features

Advanced optical system

• LED that generates very little heat.
• 8 nm narrowband 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.

Stable Light Source:

The internal reference system of the HI-97104 photometer 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.

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.

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.

Greater Light Yield:

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

CAL Check Functionality:

Hanna’s exclusive CAL Check feature allows for performance verification and calibration of the meter using NIST traceable standards. Our CAL Check standard vials are developed to simulate a specific absorbance value at each wavelength to verify the accuracy of subsequent readings.

Multiple Measurement Methods:

Users can select the use of powder reagents supplied in packets or the use of low cost liquid reagents supplied in a dropper bottle.

Built-in Reaction Timer:

Waiting the proper reaction time is of key importance when performing colorimetric measurements. The countdown timer displays the time remaining until a measurement will be taken, ensuring consistent results between sample measurements and users.

Large Cuvette Size:

The sample cell of the HI-971044 fits a round, glass cuvette with a 25 mm path length. The relatively long path length of the sample cuvette allows the light to pass through more of the sample solution, ensuring accurate measurements even in low absorbance samples.

Intuitive Dot Matrix Display:

The HI-971044 is designed with a backlit, graphic LCD. With virtual keys, a battery status indicator, and error messages. Users will find the meter interface intuitive and easy to read. A dedicated help key provides information relating to the current meter operation, and can be used at any stage in the setup or measurement process to show contextual help.

Auto-off Protection:

The meter uses three common AA batteries that allow for about 800 measurements to be taken. The auto-off feature automatically shuts off the meter after 15 minutes of inactivity in order conserve battery life.

About chlorine

Chlorine is a common chemical used by most due to is disinfection properties.

Free chlorine can exist in two forms and which form is present is based on the pH. At pH less than 7.6, the predominate form is hypochlorous acid (HOCl), while at pH greater than 7.6, the hypochlorite (OCl-) form becomes predominate.

This is very important when it comes to preventing biological growth in water or keeping a swimming pool safe since hypochlorous acid is 100 times more effective as a sanitiser.

Total chlorine represents both the free chlorine and combined chlorine present.

Combined chlorine is the chlorine bound to nitrogen substances such as ammonia. In swimming pools, combined chlorine is what we can smell and is irritating to the eyes. The free chlorine measurement is subtracted from the total chlorine measurement in order to know how much combined chlorine is present. HI-97104 is designed to measure pH and low levels of free and total chlorine in water up to 5.00 mg/L (ppm).

Alkalinity & Cyanuric acid

Cyanuric acid (CYA) is best known as a stabilising reagent for chlorine. It is widely applied in swimming pool and spa treatment programmes to slow down the decomposition of hypochlorous acid. In outside pool areas, this process is accelerated by the effects of UV rays. When applied properly it can save up to 80% of normal chlorine consumption in pools during peak months.

Cyanuric acid is also used in chlorinated beaches, selective herbicides and whitening agents.

Alkalinity is one of the most important parameters to measure in water.

Alkalinity is different to pH. While pH indicates if a solution is an acid or an alkaline. Alkalinity tells you how much acid a solution can absorb without changing the pH. It is the buffering capacity of a solution - in this case, water.