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HI97734 Free & Total Chlorine High Range Portable Photometer

275.00  + PVM

HI97734 is an advanced portable photometer for the measurement of HR free and total chlorine in water. 

SKU: HI97734 Categories: ,

Available on backorder

HI97734 is an advanced portable photometer for the measurement of HR free and total chlorine in water.

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

  • The HI97734 meter measures free and total chlorine (Cl2) in water samples
  • No warm up time before taking a measurement
  • Tutorial mode for step-by-step instructions
  • Uses either powder or cost saving liquid reagents
  • CAL Check

The HI97734 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.

HI97734 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 comfortably 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.


Stable Light Source:

The internal reference system of the HI97734 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 HI97734 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 HI97734 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.

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.

About Chlorine

Chlorine is a common chemical used by many due to its disinfection, oxidation and bleaching properties. In swimming pools, drinking water and food processing, chlorine is used to disinfect and keep bacteria from growing. In metal finishing, it is used as an oxidiser to convert cyanide in wastewater to cyanate. In the pulp and paper industry, it is used to bleach wood pulp so that paper is white. The HI97734 meter measures free and total chlorine (Cl2) in water samples from 0.00 to 10.00 mg/L (ppm).

Also available as a kit: HI97734C Free & Total Chlorine High Range Portable Photometer Kit

The HI97734C kit is supplied with a meter, CAL Check standards, cuvettes (2), caps (2), plastic inserts for cuvette, (2), scissors, cuvette cleaning cloth, 1.5V AA batteries (3), instruction manual, and an instrument quality certificate.


Free Chlorine Range   0.00 to 10.00 mg/L as Cl2
Free Chlorine Resolution   0.01 mg/L
Free Chlorine Accuracy   ±0.03 mg/L ±3% of reading
Total Chlorine Range UHR   0.00 to 10 mg/L as Cl2
total Chlorine Resolution   1 mg/L
Total Chlorine Accuracy   ±0.03 mg/L ±3% of reading
Chlorine Method   Adaptation of EPA DPD method 330.5
Photometer/Colorimeter Light Source   Light emitting diode
Photometer/Colorimeter Light Detector   Silicon photocell with narrow band interference filter @ 420 nm
Bandpass Filter Bandwidth   8 nm
Bandpass Filter Wavelength Accuracy   ±1.0 nm
Cuvette Type   round, 24.6 mm diameter (22 mm inside)
GLP   Date, time of last calibration
Display   128 x 64 pixel B/W LCD with backlight
Logging Type   automatic logging
Logging Memory   50 measurement
Battery Type/Life   1.5V AA battery (3 pcs.) / > 800 measurements (without backlight)
Automatic Shut-Off   After 15 minutes of inactivity (30 minutes before a READ measurement)
Environment   0 to 50°C (32 to 122°F); relative humidity: 100% (IP 67, floating case)
Weight   380g with batteries
Dimensions   142.5 x 102.5 x 50.5 mm
Ordering Information   HI97734 is supplied with cuvettes (2), caps (2), plastic inserts for cuvettes (2), 1.5V AA batteries (3), instruction manual, and instrument quality certificate.
PLEASE NOTE:   In some cases, samples may contain other parameters which may interfere with results
Interference may be caused by:   Alkalinity: above 1,000 mg/L CaCO3 if present as bicarbonate (HCOsample pH < 8.3); above 25 mg/L CaCO3 if present as carbonate (CO32, sample pH > 9.0). In both cases, it will not reliably develop the full amount of colour or it may rapidly fade (negative error). To resolve this, neutralise the sample with diluted HCl. Acidity: above 150 mg/L CaCO3. May not reliably develop the full amount of colour or it may rapidly fade (negative error). To resolve this, neutralise the sample with diluted NaOH. Hardness: in case of water with hardness greater than 500 mg/L CaCO3, shake the sample for approximately 2 minutes after adding the powder reagent. Bromine (Br2), Chloride dioxide (ClO2), Iodine (I2), Oxidised Manganese and Chromium, Ozone (O3): positive error.

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