Instruction Manual HI 95724C Free & Total Chlorine ISM MAN95724C 01/04 w w w . h a n n 24 a i n s t . c o m This Instrument is in Compliance with the CE Directives www.hannainst.
Dear Customer, Thank you for choosing a Hanna product. This manual will provide you with the necessary information for the correct use of the instrument. Please read it carefully before using the meter. If you need additional technical information, do not hesitate to e-mail us at tech@hannainst.com. This instrument is in compliance with directives. USER NOTES Date Parameter Code Validation Value (mg/L) TABLE OF CONTENTS PRELIMINARY EXAMINATION ............................................................
HANNA LITERATURE PRELIMINARY EXAMINATION Hanna publishes a wide range of catalogs and handbooks for an equally wide range of applications. The reference literature currently covers areas such as: Please examine this product carefully. Make sure that the instrument is not damaged. If any damage occured during shipment, please notify your Dealer.
GENERAL DESCRIPTION CE DECLARATION OF CONFORMITY The HI 95724 is an auto diagnostic portable microprocessor meter that benefits from Hanna’s years of experience as a manufacturer of analytical instruments. It has the advanced optical system based on a special tungsten lamp and a narrow band interference filter that allows most accurate and repeatable readings. All instruments are factory calibrated and the electronic and optical design minimizes the need of frequent calibration.
WARRANTY HI 95724 is warranted for two years against defects in workmanship and materials when used for its intended purpose and maintained according to the instructions. This warranty is limited to repair or replacement free of charge. Damages due to accident, misuse, tampering or lack of prescribed maintenance are not covered. If service is required, contact your dealer. If under warranty, report the model number, date of purchase, serial number and the nature of the failure.
PRINCIPLE OF OPERATION I I Absorption of Light is a typical phenomenon of interaction between electromagnetic radiation and matter. When a light beam crosses a substance, some of the radiation may be absorbed by atoms, molecules or crystal lattices.
BATTERY REPLACEMENT . I I I Battery replacement must only take place in a non-hazardous area. Simply slide off the battery cover on the back of the meter. Detach the battery from the terminals and attach a fresh 9V battery while paying attention to the correct polarity. Insert the battery and replace the cover. A microprocessor controlled special tungsten lamp emits radiation which is first optically conditioned and beamed to the sample contained in the cuvet.
KEYPAD DESCRIPTION DATE INPUT • ON/OFF: to turn the meter on and off. • Keep READ pressed to scroll to the desired month number (01-12). • ZERO: press to zero the meter prior to measurement. • READ: press for making a measurement. • CAL CHECK: this bi-functional key allows to perform validation of the instrument just pressing the CAL CHECK key, or hold the key for 3 seconds to enter the calibration mode. • When the correct month has been set, press ZERO to confirm.
Note: at this point it is possible to reset the instrument to restore FACTORY CALIBRATION, see instructions page 17. GUIDE TO DISPLAY CODES • Place the CAL CHECK™ Standard Cuvet A into the holder and ensure that the notch on the cap is positioned securely into the groove. This prompt appears for 1 second each time the instrument is turned on. The parameter code “724” indicates that the meter is in a ready state and zeroing can be performed. Sampling in Progress.
“Error”: the concentration of the calibration solution used is not correct. Repeat the calibration procedure with the right standard solution, and verify it is not expired. If the calibration procedure fails again, contact your dealer or the nearest Hanna Customer Service Center. ERROR MESSAGES a) on zero reading This indicates that the zeroing procedure failed due to a low signal-to-noise ratio. In this case press ZERO again. “No Light”: the instrument cannot adjust the light level.
INTERFERENCES • Positive error: - Bromine Chlorine dioxide Iodine Ozone Oxidized Manganese and Chromium • Alkalinity above 250 mg/L CaCO3 or acidity above 150 mg/L CaCO3 will not reliably develop the full amount of color or it may rapidly fade. To resolve this, neutralize the sample with diluted HCl or NaOH. • In case of water with hardness greater than 500 mg/L CaCO3, shake the sample for approximately 2 minutes after adding the powder reagent.
• Do not let the reacted sample stand too long after reagent is added, or accuracy will be lost. • It is possible to take multiple readings in a row, but it is recommended to take a new zero reading for each sample and to use the same cuvet for zeroing and measurement. • After the reading it is important to discard immediately the sample, otherwise the glass might become permanently stained. • All the reaction times reported in this manual are referred to 20°C (68°F).
