Instruction Manual HI 95725C Free & Total Chlorine Cyanuric Acid / pH ISM 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. directives. This instrument is in compliance with TABLE OF CONTENTS PRELIMINARY EXAMINATION ..............................................................................................3 GENERAL DESCRIPTION ..
GENERAL DESCRIPTION SPECIFICATIONS The HI 95725 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.
PRINCIPLE OF OPERATION 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.
KEYPAD DESCRIPTION GUIDE TO DISPLAY CODES • ON/OFF: to turn the meter on and off. This prompt appears for 1 second each time the instrument is turned on. • ZERO: press to zero the meter prior to measurement. The parameter code “Cl”, “CYS” or “PH” indicates that the meter is in a ready state and zeroing can be performed. The parameter code that appears is the one of the last selected parameter (Cl=free and total chlorine, CYS=cyanuric acid or PH=pH). • READ: press for making a measurement.
“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. GENERAL TIPS FOR AN ACCURATE MEASUREMENT ERROR MESSAGES • For a correct filling of the cuvet: the liquid in the cuvet forms a convexity on the top; the bottom of this convexity must be at the same level of the 10 mL mark.
• Whenever the cuvet is placed into the measurement cell, it must be dry outside, and completely free of fingerprints, oil or dirt. Wipe it thoroughly with HI 731318 (tissue for wiping cuvets, see chapter “Accessories”) or a lint-free cloth prior to insertion. CHLORINE (FREE & TOTAL) • Do not let the reacted sample stand too long after reagent is added, or accuracy will be lost.
• Remove the cuvet. INTERFERENCES • For free chlorine measurement: add 3 drops of HI 93701A-T DPD1 indicator and 3 drops of HI 93701B-T DPD1 buffer to an empty cuvet. Immediately add 10 mL of unreacted sample. Replace the cap and shake gently. • 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.
CYANURIC ACID SPECIFICATIONS Range 0 to 80 mg/L Resolution 1 mg/L Precision ±2 mg/L @ 20 mg/L Method Adaptation of the turbidimetric method. The reaction between cyanuric acid and the reagent causes a white suspension in the sample. REQUIRE REAGENTS Code Description HI 93722-0 Cyanuric Acid Reagent Quantity/test 1 packet • Add the content of one packet of HI 93722-0 reagent. Replace the cap and shake gently for about 10 seconds (dissolution is not complete).
pH SPECIFICATIONS Range 6.5 to 8.0 pH Resolution 0.1 pH Precision ±0.1 @ 7.2 pH Method Adaptation of the Phenol Red method. The reaction with the reagent causes a yellow to red tint in the sample. REQUIRE REAGENTS Code Description HI 93710-0 pH Reagent Quantity/test 5 drops REAGENT SETS HI 93710-01 Reagents for 100 tests HI 93710-03 Reagents for 300 tests For other accessories see page 24. MEASUREMENT • Press ZERO/SET and “SIP” will blink on the display. • After a few seconds the display will show “-0.
VALIDATION PROCEDURE Use the validation procedure to ensure that the instrument is properly calibrated. This feature is only active in the chlorine measurement mode. Warning: do not validate or calibrate the instrument with standard solutions other than the Hanna CAL CHECK™ Standards, otherwise erroneous results will be obtained. For accurate Validation and Calibration, please perform test at room temperature: 18 to 25°C (64.5 to 77.0°F).
• Now the display will show the day number blinking. Keep READ pressed to scroll to the desired day number (01-31). • Press ZERO/SET and “SIP” will blink on the display. • After a few seconds the display will show “-0.0-”. The meter is now zeroed and ready for calibration. Note: it is possible to change from day to month and vice versa by pressing ZERO. • Remove the cuvet and place the CAL CHECK™ Standard HI 95725-11 Cuvet B into the holder.
BATTERY REPLACEMENT WARRANTY 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.
CE DECLARATION OF CONFORMITY HANNA LITERATURE Hanna publishes a wide range of catalogs and handbooks for an equally wide range of applications. The reference literature currently covers areas such as: • Water Treatment • Process • Swimming Pools • Agriculture • Food • Laboratory and many others. New reference material is constantly being added to the library. For these and other catalogs, handbooks and leaflets contact your dealer or the Hanna Customer Service Center nearest to you.
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