HANNA PHOTOMETER REAGENTS · HI95771
Keep total-chlorine UHR measurements supplied with matched A/B chemistry
Choose Hanna HI95771 to replenish the two-powder reagent system for total chlorine at ultra high range. The HI97771 Total Chlorine UHR method measures 0–500 mg/L as Cl2. Nominal 100-test and 300-test packs support the same method, so replenishment can follow workload without changing analytical chemistry.
Manufacturer reference photo identifies the two powder components. Pictured lot/expiry markings are illustrative, not the supplied lot or an inventory count.
Match the method, not just the element name
HI97771: 0–500 mg/L as chlorine (Cl2), total chlorine UHR. Two powder components: HI95771A-0 and HI95771B-0. Not ultra low range and not free-chlorine UHR chemistry.
What the selected pack supplies
HI95771-01 and HI95771-03 supply complete matched total-chlorine UHR reagent sets with manufacturer-nominal capacities of 100 and 300 tests. A determination uses both powder components; nominal capacity is not an independently verified count of the physical packets in the retail box.
Where this method fits
Reserve this family for the Total Chlorine UHR method. The HI97771 also offers free-chlorine measurements at 0.00–5.00 mg/L using different chemistry; that capability does not make HI95771 a free-chlorine reagent. HI83300 and HI83399 also document the HI95771 reagent family; follow their instrument-specific procedures.
The HI97771 workflow at a glance
Select Total Chlorine UHR on HI97771 and zero with 10 mL of unreacted sample. Remove the cuvette, add one packet each of HI95771A-0 and HI95771B-0, replace stopper and cap, and shake gently for 20 seconds. Reinsert as directed and use the one-minute read countdown. Follow the linked current manual for complete operation; do not borrow the free-chlorine procedure.
Check the sample matrix
Bromine, chlorine dioxide, chromium, iodine, oxidized manganese and ozone may interfere. Review the sample’s oxidant matrix before interpreting a result as total chlorine. The stated 0–500 mg/L range is the HI97771 total-chlorine UHR method range, not a promise of suitability for every sample matrix.
Choose a pack around your workload
HI95771-01 supplies 100 tests; HI95771-03 supplies 300 tests. The larger pack supplies three times the determinations, not a different measuring range. One order quantity means one complete selected pack. Choose by testing frequency and the lot/expiry markings on supplied stock.
What to have beside the reagent set
Supply the compatible photometer, cuvettes with stoppers and caps, and the measuring/dispensing accessories required by the method separately. CAL Check standards are separate instrument-verification materials, not replacements for sample reagents.
Handling before you begin
Review both current US component SDS documents for PPE, handling, storage, spill response and disposal. Keep the two powders identified and use both components for the method. Check the lot and expiry on supplied stock rather than the older illustrative photo. Hanna marks these offers as Dangerous Goods, with ground shipment only.
Use the linked HI97771 instrument manual as the method reference for the complete procedure, precautions and instrument operation. This is not a separate reagent instruction manual.
Frequently Asked Questions
Should I choose 100 or 300 tests?
HI95771-01 supplies 100 tests; HI95771-03 supplies 300 tests. Both are complete reagent sets for the same method. Choose by expected workload and marked expiry dates, not by a different analytical range.
Is UHR the same as ultra low range?
No. UHR means ultra high range here: 0–500 mg/L as Cl2 for total chlorine on HI97771. It is not an ultra-low-range reagent family.
Does this also measure free chlorine on HI97771?
No. HI95771 is for Total Chlorine UHR only. HI97771’s free-chlorine range is 0.00–5.00 mg/L and uses different reagents. Do not infer free-chlorine UHR capability from the instrument’s combined product name.
Are both reagents powders?
Yes. The documented method uses one packet of HI95771A-0 and one packet of HI95771B-0 per determination. Both components are required; this is not a liquid A/B reagent system.
What mixing and timing does the primary method use?
After zeroing 10 mL of sample, add both specified powders, replace the stopper and cap, and shake gently for 20 seconds. Use the one-minute read countdown and follow the current HI97771 manual for the complete sequence.
Which photometers are documented for HI95771?
Both packs are documented for HI97771, HI83300, HI83399. The procedure and range on this page use HI97771 as the primary reference; follow the exact instrument method when using another model.
Which sample conditions should I check first?
Bromine, chlorine dioxide, chromium, iodine, oxidized manganese and ozone may interfere. Review the sample’s oxidant matrix before interpreting a result as total chlorine. The stated 0–500 mg/L range is the HI97771 total-chlorine UHR method range, not a promise of suitability for every sample matrix.
Are the instrument, cuvettes and CAL Check standards included?
No. These are reagent-only packs. Provide the photometer, cuvettes with stoppers and caps, and the method-required sampling and dispensing accessories separately. CAL Check standards are separate instrument-validation materials, not test reagents.
