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Brand: Hanna Instruments
Hanna HI97711 Free and Total Chlorine Portable Photometer
Description
A waterproof photometer for free and total chlorine in the field
The HI97711 is an auto-diagnostic portable photometer that measures free and total chlorine in water samples from 0.00 to 5.00 mg/L (ppm). The method is an adaptation of the US EPA Method 330.5 DPD colorimetric method. Chlorine is widely used as a disinfectant for drinking water, wastewater and swimming pools, so a compact meter that can be taken to the sampling point is useful for network checks, tank inspections and routine plant rounds.
The optical system uses a light-emitting diode and a narrow-band interference filter at 525 nm with a silicon photocell detector, and the optical chamber is sealed against dust, dirt and water. A positive-locking cuvette holder places the cuvette in the same position on every reading, which supports repeatable results.
Technical specifications
| Parameter | Specification |
|---|---|
| Model / order code | HI97711 (HI97711C includes CAL Check cuvettes and carrying case) |
| Parameters | Free chlorine and total chlorine, as Cl2 |
| Range | 0.00 to 5.00 mg/L |
| Resolution | 0.01 mg/L |
| Accuracy | ±0.03 mg/L ±3 % of reading at 25 °C |
| Method | Adaptation of US EPA Method 330.5, DPD colorimetric method |
| Light source | Light-emitting diode |
| Bandpass filter | 525 nm; bandwidth 8 nm; wavelength accuracy ±1.0 nm |
| Light detector | Silicon photocell |
| Cuvette type | Round, 24.6 mm diameter (22 mm inside) |
| Auto logging | 50 readings |
| Display | 128 x 64 pixel black and white LCD with backlight |
| Auto-off | After 15 minutes of inactivity (30 minutes before a READ measurement) |
| Battery | 3 x 1.5 V AA alkaline; over 800 measurements without backlight |
| Environment / protection | 0 to 50 °C, 0 to 100 % RH; IP67, floating case |
| Dimensions / weight | 142.5 x 102.5 x 50.5 mm / 380 g with batteries |
CAL Check validation and guided operation
The CAL Check function lets the user validate the performance of the instrument at any time and apply a user calibration if necessary. Hanna makes its CAL Check cuvettes with NIST-traceable standards, which gives a documented way to show an auditor or a quality manager that the meter is still reading correctly. A built-in tutorial mode guides the operator step by step through sample preparation, the reagents required and the quantities.
The meter holds both powder-reagent and liquid-reagent methods for free and total chlorine. Powder reagents come as single packets (for example HI93701-0 free chlorine) or in packs of 100 and 300 tests, and the liquid method uses reagent drops (HI93701A-F and HI93701B-F for free chlorine, with a third reagent for total chlorine). A GLP function and 50 logged readings help with record keeping.
Who should choose it, and what ships with it
This photometer is suited to chlorination checks on potable water, residual monitoring after tank cleaning, wastewater disinfection checks and general water-treatment rounds. When turbidity must also be measured, Hanna lists the HI83414 benchtop meter, which combines turbidity with free and total chlorine.
Before ordering, decide between the HI97711 kit and the HI97711C kit, plan reagent consumption for the number of tests expected, and consider spare cuvettes. Per Hanna’s manual, the HI97711 ships in a cardboard box with two sample cuvettes, two cuvette caps, two plastic stoppers, AA batteries, a quality certificate and the manual. The HI97711C adds a rugged carrying case, a zero CAL Check cuvette A, an HI97701B CAL Check cuvette B for free and total chlorine, a wiping cloth, scissors and a CAL Check standard certificate.
Documents and quotation
The instruction manual is attached. For other water-quality instruments, browse Portable Test and Measurement, or see the Hach CL17sc colorimetric chlorine analyzer for an online alternative. Request availability and delivery details through the RFQ form, quoting the model code and the kit variant.
Datasheets & Documents
- Instruction Manual Hanna HI97711 Instruction Manual Download
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About brand
Hanna Instruments is a maker of analytical instruments for water and liquid testing, founded in 1978 in the Padua area of Italy by Oscar and Anna Nardo. Its early breakthrough was the pHep, an affordable pocket-sized pH tester. The company is now led by the founders' children, Martino and Pamela Nardo, with its headquarters in Woonsocket, Rhode Island, and offers more than 3,000 products.
Seven Star LLC is an independent supplier in Muscat. We list Hanna instruments for water, wastewater and laboratory users in Oman and the GCC.
Hanna Instruments company profile
| Founded | 1978, near Padua, Italy, by Oscar and Anna Nardo |
|---|---|
| Headquarters | Woonsocket, Rhode Island, USA |
| Leadership | Martino Nardo and Pamela Nardo |
| Early product | The pHep pocket pH tester |
| Product families | pHep and HI98 waterproof testers, edge benchtop meters, HI83 multiparameter photometers, Checker HC handheld colorimeters, HI931 and HI932 titrators, process controllers, reagents and calibration buffers |
Hanna product series
Portable meters include the HI98190 pH and ORP meter, the HI98192 EC, TDS and salinity meter, the HI98193 dissolved oxygen and BOD meter, the HI98199 pH, EC and DO meter and the HI9829 multiparameter water quality meter.
The HI98703 is an EPA compliant portable turbidity meter, the HI97711 a free and total chlorine photometer and the HI83414 a benchtop turbidity and chlorine meter.
Waterproof portable meters such as the HI98190 and HI98192 suit field use, with automatic temperature compensation and GLP data for audits. Turbidity measurement with the HI98703 follows EPA method 180.1, and the HI97711 photometer measures free and total chlorine for disinfection control.
Where Hanna instruments are used
Drinking water and desalination plants, wastewater treatment, environmental field surveys, aquaculture, cooling water and quality control labs.
Hanna Instruments products we list
Ordering Hanna instruments: what we need
Send the model, the parameters and ranges, the probe and cable length and any reagents or calibration solutions required.
Facts checked against Hanna Instruments' own company story and City of Woonsocket business profile, October 2026.
Browse Hanna Instruments products by category: Portable Test & Measurement.
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Frequently Asked Questions
What chlorine range does the HI97711 measure?
0.00 to 5.00 mg/L for both free and total chlorine, with 0.01 mg/L resolution.
Which method does the meter use?
An adaptation of US EPA Method 330.5, the DPD colorimetric method, at 525 nm.
How can the instrument be validated?
The CAL Check function uses Hanna NIST-traceable cuvettes to confirm performance and to apply a user calibration if needed.
Is the meter waterproof?
Yes. It has an IP67 rated floating case.
How many readings does it log?
Hanna lists 50 auto-logged readings.
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