Hanna Instruments HI 93711 - Free & Total Chlorine ISM Manual

PRELIMINARY EXAMINATION

Remove the instrument from the packing material and examine it carefully to make sure that no damage has occurred during shipment. If there is any damage, notify your Dealer.

Each Ion Specific Meter is supplied complete with

• 9V Battery
• Two Sample Cuvets and Caps
• One Transport Cap

Note: Conserve all packing material until the instrument has been observed to function correctly. Any defective item must be returned in its original packing.

GENERAL DESCRIPTION

The HI 93711 meter measures the free and total chlorine (Cl₂) content in water and wastewater.
The meter uses an exclusive positive-locking system to ensure that the cuvet is in the same place every time it is placed into the measurement cell.
The reagents are in liquid and powder form and are supplied in bottles and in packets. The amount of reagent is precisely dosed to ensure maximum repeatability.
Display codes aid the user in routine operations.
The meters have an auto-shut off feature that will turn the instrument off after 10 minutes of non-use.

SPECIFICATIONS

REQUIRED REAGENTS

DISPLAY CODE GUIDE

	This indicates that the meter is in a ready state and zeroing can be performed.
	Sampling in Progress. This prompt appears each time the meter is performing a measurement.
	This indicates that the meter is in a zeroed state and measurement can be performed.
	A zero reading was not taken. Insert a sample before adding reagent and press ZERO.
	Under range. A blinking "0.00" indicates that the sample absorbs less light than the zero reference. Check the procedure and make sure you use the same cuvet for reference (zero) and measurement.
	Over range. A flashing value higher than the maximum concentration readable (see specifications) indicates that the sample absorbs too much light, meaning that the concentration is too high. Dilute the sample.
	Light over range. The cuvet is not inserted correctly and an excess ambient light is reaching the detector. If the cover is properly installed, then contact your dealer or the nearest Hanna Customer Service Center.
	Light under range. The zero sample is too dark for proper zeroing. If this is not the case, contact your dealer or the nearest Hanna Customer Service Center.
	The "V" indicates that the battery voltage is getting low and the battery needs to be replaced.
	This indicates that the battery is dead and must be replaced. Note: once this indication is displayed, the meter will lockup. Change the battery to restart.

OPERATIONAL GUIDE

MEASUREMENT PROCEDURE

• Turn the meter on by pressing ON/OFF.
  
• When the LCD displays "- - -",it is ready.
  
• Select free or total Chlorine by pressing FREE/TOTAL. An"I" or a "C" will appear on the right corner to indicate free or total chlorine, respectively.
  
• Fill the cuvet with 10 mL ofunreacted sample, up to the mark, and replace the cap.
  
• Place the cuvet into the holderand ensure that the notch on the cap is positioned securely into the groove.
  
• Press ZERO and "SIP" will appear on the display.
  
• Wait for a few seconds andthe display will show "-0.0-".
  Now the meter is zeroed and ready for measurement.
  
• Remove the cuvet

Powder reagents procedure

• Add the specific test reagent to the cuvet:
  Free Chlorine: 1 packet of DPD Free Chlorine reagent
  
  Total Chlorine: 1 packet of DPD Total Chlorine reagent.
  
• Replace the cap and shakegently for 20 seconds (or 2 minutes in case of seawater analysis).
  
• Replace the cuvet into the holder and ensure that the notch on the cap is positioned securely into the groove.
  
• Wait for 1 minute in case of Free Chlorine or 2 minutesand 30'' seconds in case of Total Chlorine and then press READ. The display will show "SIP" during measurements.
  
• The instrument directly displays concentration in mg/L ofFree or Total Chlorine on the Liquid Crystal Display.

Liquid reagents procedure

• To an empty cuvet add 3 drops of HI 93701A-T DPD1 indicator, 3 drops of HI 93701B-T DPD1 buffer and only in case of Total Chlorine measurement add also 1 drop of HI 93701C DPD solution. Swirl gently to mix and immediately add 10 mL of unreacted sample. Replace the cap and shake gently again.
  
  
• Reinsert the cuvet into the instrument.
  
• Wait for 1 minute in case of Free Chlorine or 2 minutesand 30'' seconds in case of Total Chlorine and then press READ. The display will show "SIP" during measurements.
  
• The instrument directly displays concentration in mg/L of Free or Total Chlorine on the Liquid Crystal Display.

Note: free and total chlorine have to be measured separately with fresh unreacted samples following the above procedure if both values are requested.

INTERFERENCES

Interference may be caused by:
Bromine Iodine
Fluorine Ozone
Oxidized manganese and Chromium

Alkalinity above 250 mg/L or acidity above 150 mg/L 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 1 minute after adding the powder reagent.

TIPS FOR AN ACCURATE MEASUREMENT

The instruction listed below should be carefully followed during testing to ensure best accuracy.

• Do not touch the cuvet walls with hands.
• In order to maintain the same conditions during thezeroing and the measuring phases, it is necessary to close the cuvet to prevent any contamination.
• Do not let the test sample stand too long after reagentis added or accuracy will be lost.
• Whenever the cuvet is placed into the measurement cell, it must be completely free of fingerprints, oil or dirt. Wipe it thoroughly with HI 731318 or a lint-free cloth prior to insertion.
• It is important that the sample does not contain anydebris. This would corrupt the readings.
• It is possible to take multiple readings in a row, but itis recommended that a zero reading be taken for each sample and that the same cuvet is used for zeroing and measurement.
• It is important to discard the sample immediately afterthe reading is taken because the glass might become permanently stained.
• Shaking the cuvet can generate bubbles in the sample, causing higher readings. To obtain accurate measurements, remove such bubbles by swirling or by gently tapping the vial.
• All the reaction times reported in this manual are referredto 20°C (68°F). As a general rule of thumb, they should be doubled at 10°C (50°F) and halved at 30°C (86°F).

ACCESSORIES

www.hannainst.com

Documents / Resources

References

• pH Meters, Photometers, Titrators, Controllers - Hanna Instruments

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