Keep trace free-chlorine checks on the right scale.
Replenish ultra-low-range free-chlorine testing with the DPD powder made for your HI97762 workflow. Pre-measured packets make dosing straightforward; 100- and 300-test packs let you match replenishment to the number of samples you actually run.
Official Hanna reference packaging. Printed lot numbers and expiration dates are illustrative, not the dates of supplied stock.
Match the method before the pack size
Choose HI95762-01 or HI95762-03 for HI97762 FREE chlorine ultra low range testing: 0.000 to 0.500 mg/L as Cl₂. This is not HI95761 total-chlorine ULR chemistry, a general higher-range chlorine refill or a CAL Check standard.
A defined reaction and reporting basis
Free chlorine reacts with DPD to develop a pink tint, measured photometrically and reported as Cl₂ equivalents. The result is free chlorine, not total chlorine. A 0.500 mg/L upper limit makes method selection important: a larger test pack does not turn this into a higher-range measurement.
Where this refill fits
Suited to an established drinking-water testing program that needs a free-chlorine result within the ultra-low range. If the required result is total chlorine or the expected concentration exceeds this method’s range, select the appropriate separate chemistry and instrument method instead.
Know when the sample needs pretreatment
The US HI95762-0 SDS identifies drinking-water samples as its intended use. Bromine, chlorine dioxide, iodine, ozone and oxidized chromium or manganese can interfere. For hardness above 500 mg/L as CaCO₃, the HI97762 manual calls for approximately two minutes of shaking after adding the reagent. Do not infer universal seawater or high-salinity suitability from the chlorine parameter name.
Color may develop incompletely or fade rapidly above these limits: bicarbonate alkalinity of 1000 mg/L as CaCO₃ at pH below 8.3, carbonate alkalinity of 25 mg/L as CaCO₃ at pH above 9.0, or acidity of 150 mg/L as CaCO₃. The HI97762 method specifies neutralization with diluted HCl or NaOH to remove this interference. Follow the complete pretreatment instructions; do not add an arbitrary neutralizer dose.
What the selected pack supplies
HI95762-01 contains pre-measured HI95762-0 powder reagent for 100 tests; HI95762-03 provides 300 tests. One determination consumes one packet. Test capacity refers to analytical use, not a count of reusable cuvettes or instruments.
What to have ready separately
Have a compatible photometer, clean cuvettes with stoppers and caps, a representative sample and the accessories required by the method. None is included in this reagent refill. CAL Check standards are separate instrument-verification materials, not replacements for the sample reagent.
Run the measurement in sequence
Fill a clean cuvette with 10 mL of unreacted sample, fit the stopper and cap, align the cap notch and zero the HI97762. Add one packet of HI95762-0, close the cuvette and shake gently for about 20 seconds. Reinsert it in the correct orientation and use the one-minute countdown before reading. Apply the manual’s specific matrix treatments where required.
Choose for your testing schedule
Select the 100-test HI95762-01 for smaller sampling workloads or the 300-test HI95762-03 for more frequent use. Include repeat measurements and quality-control work in your planning, and choose a quantity you can use within the expiration date on the supplied lot.
Other documented instrument methods
Exact-model Hanna manuals also list both packs for HI83300, HI83399. Select the matching free chlorine ultra low range method and follow that model’s procedure. The detailed range and workflow above refer to HI97762.
Frequently Asked Questions
What is the difference between the two packs?
HI95762-01 supplies 100 tests and HI95762-03 supplies 300. Both use HI95762-0 powder, one packet per determination. Choose by sampling workload and likely use before the marked expiration date, not by range.
Will HI95762 measure total chlorine?
No. It is the FREE chlorine ultra low range family for HI97762. HI95761 is a different total-chlorine ULR family. Do not substitute based on a similar catalog number or the same test count.
What range and reporting basis does HI97762 use?
The range is 0.000 to 0.500 mg/L as Cl₂. This expresses a free-chlorine result on a chlorine-equivalent basis; it does not make the measurement total chlorine. Both pack sizes have the same range.
How do I run the normal HI97762 sequence?
Use 10 mL of unreacted sample to zero, then add one HI95762-0 packet. Close and shake gently for about 20 seconds and run the one-minute countdown. Follow the method’s cuvette orientation, timing and matrix-treatment instructions.
When is neutralization or extra shaking required?
The HI97762 method calls for diluted HCl or NaOH neutralization when the specified alkalinity or acidity limits are exceeded. Those limits are above 1000 mg/L as CaCO₃ for bicarbonate at pH below 8.3, above 25 mg/L as CaCO₃ for carbonate at pH above 9.0, or acidity above 150 mg/L as CaCO₃. Hardness above 500 mg/L as CaCO₃ calls for approximately two minutes of shaking after reagent addition. Use the full manual before treatment.
Can other disinfectants affect the reading?
Yes. Bromine, chlorine dioxide, iodine, ozone and oxidized chromium or manganese can interfere. The US SDS identifies drinking-water samples as the intended use; these documents do not establish universal seawater or high-salinity suitability.
Which photometers and accessories do I need?
HI97762 is the primary portable method. Exact-model manuals also document both packs for HI83300 and HI83399. The photometer, cuvettes, stoppers, caps, preparation accessories and CAL Check standards are separate; select the free-chlorine ULR method on a multiparameter meter.
What should I check on a new pack?
Confirm HI95762-0 reagent identity, the lot number and expiration date on the supplied packets, and review its linked US Safety Data Sheet for handling, storage and disposal. Keep sample-testing reagents separate from CAL Check instrument standards.
