Instruction Manual
HI 3875
Free Chlorine
Medium Range
Test Kit with
Checker Disc
SPECIFICATIONS
Range
Smallest Increment
0 to 3.5 mg/L (ppm) as Free Chlorine
0.1 mg/L
Analysis Method
Sample Size
Colorimetric
5 mL
Number of Tests 100
Case Dimensions 235x175x115 mm (9.2x6.9x4.5")
Shipping Weight 984 g (34.7 oz.) www.hannainst.com
Dear Customer,
Thank you for choosing a Hanna Product.
Please read the instruction sheet carefully before using the test kit. It will provide you with the necessary information for correct use of the kit. If you need additional information, do not hesitate to e-mail us at [email protected].
Remove the chemical test kit from the packing material and examine it carefully to make sure that no damage has occurred during shipping. If there is any noticeable damage, notify your Dealer or the nearest Hanna office immediately.
Each kit is supplied with:
• HI 93701-0 Free Chlorine Reagent, packets (100 pcs);
• Deionized Water, 1 bottle (500 mL);
• 1 checker disc (containing the disc);
• 2 glass vials with caps;
• 1 plastic pipette (3 mL).
Note: Any damaged or defective item must be returned in its original packing materials.
SIGNIFICANCE AND USE
Chlorine is the most commonly used water disinfectant in applications that vary from treatment of drinking water and wastewater, pool and spa sanitization, to food processing and sterilization. Chlorine present in water binds with bacteria, leaving only a part of the original quantity (free chlorine) to continue its disinfecting action. If the free chlorine level is improper with respect to pH, water will have an unpleasant taste and odor and the disinfecting potential of the chlorine will be diminished.
Free chlorine reacts with ammonium ions and organic compounds to form chlorine compounds resulting in diminished disinfecting capabilities compared with free chlorine.
Chlorine compounds together with chloramines form combined chlorine. Combined chlorine and free chlorine together result in total chlorine.
While free chlorine has a much higher disinfectant potential, combined chlorine has a much higher stability and has a lesser volatility.
Note: mg/L is equivalent to ppm (parts per million).
CHEMICAL REACTION
The reaction between chlorine and the DPD reagent causes a pink tint in the sample which is proportional to the chlorine concentration.
INSTRUCTIONS
READ THE ENTIRE INSTRUCTIONS BEFORE USING THE KIT
• Use the pipette to fill each glass vial with
5 mL of sample (up to the mark).
5 mL
• Insert one of the vials into the left hand opening of the checker disc. This is the blank.
• Keep the checker disc at a distance of 30-40 cm (12-
16") from the eyes to match the color. Rotate the disc while looking at the color test windows and stop when you find the color match. Read the value in the result window directly in mg/L (or ppm) of Chlorine.
• Add to the other vial deionized water up to the 10 mL mark. Replace the cap and shake to mix.
For best results: Perform the reading three times and take the average value (divide by 3 the sum of the three numbers). Intensely colored samples will make the color matching difficult and they should be adequately treated before performing the test. Suspended matter in large amounts should be removed by prior filtration.
Caution: Ultraviolet radiation may cause fading of colors.
When not in use, keep the disc protected from light, in a cool and dry place.
Interferences: bromine, iodine, fluorine, ozone, oxidized manganese and chromium.
• Remove the cap and add 1 packet of HI 93701-0 reagent. Replace the cap and mix. This is the reacted sample.
REFERENCES
Adaptation of the EPA recommended DPD method 330.5.
HEALTH AND SAFETY
The chemicals contained in this kit may be hazardous if improperly handled. Read the relevant Health and Safety
Data Sheet before performing this test.
• Remove the cap and insert the reacted sample into the right hand opening of the checker disc.
• Hold the checker disc so that a light source illuminates the samples from the back of the windows.
