Hanna Instruments Checker HI701

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Tips for an Accurate Measurement

• Ensure the sample does not contain any debris.

• Whenever the cuvette is placed into the checker, it must be

dry outside and free of fingerprints, oil and dirt.

• Wipe the cuvette thoroughly with HI731318 microfiber

cleaning cloth or a lint-free cloth prior to insertion.

• Shaking the cuvette can generate bubbles, causing higher

readings. To obtain accurate measurements, remove such

bubbles by swirling or by gently tapping the cuvette.

• Do not let the reacted sample stand too long after reagent

has been added, as accuracy will be affected.

• Discard the sample immediately after the reading has been

taken or the glass might become permanently stained.

Battery Replacement

To save the battery, the checker shuts down after 2 minutes of non-use.

A fresh battery lasts for a minimum of 5000 measurements. When the battery is

drained, the instrument displays “bAd” then ”bAt”, and turns off.

To replace the battery, follow the next steps:

1. Press and hold the ON/OFF button to turn the checker off.

2. Turn the instrument upside down and use a screwdriver to unfasten the screw and

remove the battery cover.

HI701

3. Remove the old battery, replace it with a new 1.5V AAA battery, inserting the

negative end first.

4. Replace the battery cover, fasten and tighten the screw.

Accessories

Reagent Sets

HI701-25 Reagents for 25 Free Chlorine tests

Other Accessories

HI701-11 Free Chlorine certified standard kit

HI731225 Cuvette black cap for Checker

HC colorimeters (4 pcs.)

HI731318 Cloth for wiping cuvettes (4 pcs.)

HI731321 Glass cuvette and seal cap for Checker

HC colorimeters (4 pcs.)

HI740028P 1.5V AAA battery set (12 pcs.)

HI93703-50 Cuvette cleaning solution, 230 mL

Certification

All Hanna Instruments conform to the CE European Directives.

Disposal of Electrical & Electronic Equipment. The product

should not be treated as household waste. Instead hand it over

to the appropriate collection point for the recycling of electrical

and electronic equipment which will conserve natural resources.

Disposal of waste batteries. This product contains batteries, do

not dispose of them with other household waste. Hand them over

to the appropriate collection point for recycling.

Ensuring proper product and battery disposal prevents potential negative

consequences for the environment and human health. For more information,

contact your city, your local household waste disposal service, the place of

purchase or go to www.hannainst.com.

Recommendations for Users

Before using this product, make sure it is entirely suitable for your specific

application and for the environment in which it is used. Any variation introduced

by the user to the supplied equipment may degrade the checker’s performance.

For your and the checker’s safety do not use or store it in hazardous environments.

Warranty

HI701 Checker

HC is warranted for a period of one year against defects in

workmanship and materials when used for its intended purpose and maintained

according to instructions. This warranty is limited to repair or replacement free

of charge. Damage due to accidents, misuse, tampering or lack of prescribed

maintenance is not covered. If service is required, contact your local Hanna

Instruments Office. If under warranty, report the model number, date of purchase,

serial number and the nature of the problem. If the repair is not covered by the

warranty, you will be notified of the charges incurred. If the checker is to be

returned to Hanna Instruments, first obtain a Returned Goods Authorization (RGA)

number from the Technical Service department and then send it with shipping

costs prepaid. When shipping any product, make sure it is properly packaged for

complete protection.

Hanna Instruments reserves the right to modify the design, construction, or

appearance of its products without advance notice.

All rights are reserved. Reproduction in whole or in part is prohibited without the

written consent of the copyright owner, Hanna Instruments Inc., Woonsocket,

Rhode Island, 02895, USA.

IST701 09/20

HI701

Free Chlorine

INSTRUCTION MANUAL

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Summary

Preliminary Examination and General Description

Specifications and Functional Description

Errors & Warnings

Light High Error

Indicates excess ambient light reaching the detector. Check zero cuvette preparation.

Light Low Error

Indicates insufficient light for measurement. Check zero cuvette preparation.

Inverted Cuvettes Warning

Sample and zero cuvettes are inverted. Swap them and repeat the measurement.

Under Range Condition

Sample absorbs less light than zero reference. Check procedure and cuvette use.

Over Range Condition

Measured value exceeds method limits. Check for debris, dilute, and repeat.

Battery Low Warning

Battery level too low for proper function. Replace with a new battery.

Drained Battery

Battery is drained and must be replaced. Restart the checker after replacement.

Measurement Tips and Battery Replacement

Recommendations and Warranty Information

Summary

Preliminary Examination and General Description

Specifications and Functional Description

Errors & Warnings

Light High Error

Indicates excess ambient light reaching the detector. Check zero cuvette preparation.

Light Low Error

Indicates insufficient light for measurement. Check zero cuvette preparation.

Inverted Cuvettes Warning

Sample and zero cuvettes are inverted. Swap them and repeat the measurement.

Under Range Condition

Sample absorbs less light than zero reference. Check procedure and cuvette use.

Over Range Condition

Measured value exceeds method limits. Check for debris, dilute, and repeat.

Battery Low Warning

Battery level too low for proper function. Replace with a new battery.

Drained Battery

Battery is drained and must be replaced. Restart the checker after replacement.

Measurement Tips and Battery Replacement

Recommendations and Warranty Information

The Hanna Instruments HI701 Free Chlorine Checker HC is a handheld colorimeter designed for accurate and easy monitoring of free chlorine levels in various water sources. This compact and user-friendly device is an essential tool for maintaining optimal water quality in swimming pools, aquariums, and spas, and can also be used to determine chlorine levels in fish tanks to ensure the health of fish and plants.

Function Description

The HI701 operates based on the adaptation of US EPA Method 330.5, a widely recognized standard for chlorine measurement. This method relies on a chemical reaction between free chlorine present in the water sample and a DPD (N,N-diethyl-p-phenylenediamine) reagent. When the DPD reagent is added to a sample containing free chlorine, it causes a distinctive pink tint to develop. The intensity of this pink color is directly proportional to the concentration of free chlorine in the sample.

The device then uses a light-emitting diode (LED) as its light source, specifically at a wavelength of 525 nm. This light passes through the tinted sample, and a silicon photocell acts as the light detector, measuring the amount of light absorbed by the sample. The colorimeter's internal circuitry processes this light absorption data and converts it into a digital reading, which is then displayed on the liquid crystal display (LCD) in parts per million (ppm) of free chlorine. This photometric measurement ensures a precise and reliable determination of free chlorine levels.

Usage Features

The HI701 is designed for single-button operation, making it exceptionally easy to use, even for individuals without extensive laboratory experience. The measurement procedure is straightforward and can be completed in a few simple steps:

Power On and Zeroing: To begin, the user presses the ON/OFF button to turn on the checker. The LCD will display all segments briefly, followed by "Add" and "C.1" with "Press" blinking, indicating it's ready for the first step. The user then fills a cuvette with 10 mL of the unreacted sample and caps it. This cuvette is inserted into the checker, and the cap is closed. Pressing the ON/OFF button again initiates the zeroing process. The display will show "Add" and "C.2" with "Press" blinking, confirming that the checker has been zeroed against the unreacted sample. This crucial step establishes a baseline measurement, accounting for any inherent color or turbidity in the sample itself, ensuring that only the color change due to the reagent is measured.
Reagent Addition and Reaction: After zeroing, the user removes the cuvette, unscrews the cap, and adds the entire content of one packet of HI701-0 Free Chlorine reagent. The cap is then replaced, and the cuvette is gently shaken for 20 seconds to ensure thorough mixing and complete reaction between the chlorine and the reagent. This shaking process is important for accurate results, but it's also advised to avoid vigorous shaking that could introduce bubbles, which might interfere with light transmission.
Measurement: Once the reagent has been added and mixed, the cuvette is reinserted into the checker, and the cap is closed. The user has two options for initiating the measurement:
- Timed Measurement: Pressing and holding the ON/OFF button will activate a countdown timer on the display. This timer ensures that the reaction has sufficient time to complete before the measurement is taken.
- Manual Measurement: Alternatively, the user can wait for 1 minute for the reaction to develop fully and then simply press the ON/OFF button to take the reading. When the timer ends or the button is pressed after the waiting period, the checker performs the reading, and the free chlorine concentration in ppm is displayed on the large LCD.

The large LCD is designed for easy readability, ensuring that the measurement results are clear and unambiguous. The auto shut-off feature is a practical addition, automatically turning off the device after 2 minutes of non-use. This intelligent power management helps conserve battery life, preventing unnecessary drainage and extending the operational time of the checker.

Maintenance Features

Proper maintenance is key to ensuring the long-term accuracy and reliability of the HI701. Hanna Instruments provides several tips for accurate measurements and battery replacement:

Sample Preparation: It is crucial to ensure that the sample does not contain any debris. Particles or suspended matter in the sample can interfere with light transmission and lead to inaccurate readings.
Cuvette Handling: The cuvette must always be dry on the outside and free of fingerprints, oil, and dirt before being placed into the checker. Any smudges or contaminants on the cuvette's surface can scatter or absorb light, affecting the measurement. To ensure optimal cleanliness, it is recommended to wipe the cuvette thoroughly with a HI731318 microfiber cleaning cloth or a lint-free cloth prior to insertion.
Bubble Management: Shaking the cuvette can sometimes generate air bubbles within the sample. These bubbles can cause higher readings by scattering light. To obtain accurate measurements, users should remove such bubbles by gently swirling or tapping the cuvette.
Timely Measurement: The accuracy of the measurement can be affected if the reacted sample stands for too long after the reagent has been added. It is important to take the reading within the recommended timeframe to ensure the chemical reaction is at its optimal stage for measurement.
Cuvette Cleaning: To prevent permanent staining of the glass cuvette, it is essential to discard the sample immediately after the reading has been taken. Residual reagents or reacted samples can leave deposits that are difficult to remove and can impact future measurements. For thorough cleaning, Hanna Instruments offers HI93703-50 Cuvette cleaning solution.
Battery Replacement: The HI701 is powered by a 1.5V AAA alkaline battery. A fresh battery provides power for a minimum of 5000 measurements. When the battery level becomes too low for proper functioning, the checker will display "bAt" (Battery Low) and eventually "bAd" (Drained Battery) before turning off. To replace the battery, the user first turns off the checker by pressing and holding the ON/OFF button. The instrument is then turned upside down, and a screwdriver is used to unfasten the screw and remove the battery cover. The old battery is removed, and a new 1.5V AAA battery is inserted with the negative end first. Finally, the battery cover is replaced, and the screw is fastened and tightened. This simple procedure ensures continuous operation of the device.

The HI701 also features clear warning messages on its LCD to alert users to potential errors or conditions outside the expected range. These include "Light High" (excess ambient light), "Light Low" (insufficient light), "Inverted Cuvettes" (sample and zero cuvettes swapped), "Under Range" (sample absorbs less light than zero reference), and "Over Range" (measured value exceeds method limits). These warnings guide the user in troubleshooting and ensuring accurate measurements.

Overall, the Hanna Instruments HI701 Free Chlorine Checker HC combines advanced photometric technology with a user-friendly design, making it an indispensable tool for anyone needing to quickly and accurately monitor free chlorine levels in various aquatic environments. Its robust construction and clear operational guidelines ensure reliable performance and ease of maintenance.

Hanna Instruments Checker HI701 Specifications

General

Type	Colorimeter
Model	HI701
Category	Measuring Instruments
Light Source	LED
Method	Colorimetric
Operating Temperature	0 to 50°C (32 to 122°F)
Auto Shut-Off	Yes
Auto-off	after 10 minutes of non-use
Waterproof	No
Resolution (as Cl2)	0.01 mg/L (ppm)
Accuracy	±0.03 ppm ±3% of reading
Light Detector	Photodiode
Storage Temperature	-20 to 60 °C
Battery Life	Approximately 1000 measurements
Measurement Range (as Cl2)	0.00 to 2.50 mg/L (ppm)
Range	0.00 to 2.50 ppm (mg/L)
Accuracy (as Cl2)	±0.05 mg/L ±5% of reading