- Device can be calibrated with water, without purchasing additional solutions
- Single button operation for ease of use
- Uses EPA Phenantroline method 315, a reaction that causes an orange tint in the sample
- Auto-off function to extend battery life
- Large LCD screen for readability
Hanna Instruments HI721 Iron Checker HC Handheld Colorimeter 0.00 to 5.00 ppm Range
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Specifications for this item
|Brand Name||Hanna Instruments|
|Number of Items||1|
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The Hanna Instruments HI 721 Checker HC Handheld Photometer is a portable tester for monitoring iron levels .
The HI 721 bridges the gap between less accurate chemical test kits, and expensive professional test instrumentation. The HI 721 operates using a silicon photocell light detector, and has an accuracy of + or - 0.04 ppm or + or - 2% of reading at 25 degrees C, using an adaptation of Standard Method 3500-Fe B. To use, zero the instrument with your water sample, then add the reagent. Place the vial into the checker, press the button, and read the results within seconds. The reaction between the reagent and iron within the water causes an orange tint in the sample.
The HI 721 operates in temperatures from 0 to 50 degrees C (32 to 122 degrees F)/RH max 95% non-condensing with a range of 0.00 to 5.00 ppm (mg/L). The device operates on one 1.5 V AAA battery, with an auto-off function that shuts off the device after three minutes of non-use. Dimensions are 81.5 x 61 x 37.5 mm (3.2 x 2.4 x 1.5”) and weight is 64 g (2.25 oz.).
Colorimeters are used to determine the concentration of a substance in a solution by measuring the amount of light transmitted through the sample, often after adding a reagent. Iron colorimeters are used in water and soil analysis to monitor iron in ground water and industrial, agricultural, and mining run-off.
Hanna Instruments manufactures a wide variety of analytical instrumentation, including pH meters, multi-parameter meters, electrodes, chemical reagents and buffer solutions. Founded in 1978, Hanna is headquartered in Woonsocket, RI, with subsidiaries in 32 countries. Hanna Instruments holds many firsts in the field of analytical instrumentation, including a pH electrode with a built-in temperature sensor, an electronic pocket-sized pH tester, and a replaceable electrode pH pocket tester. To ensure the quality of their products, Hanna is a vertically integrated manufacturer and does not subcontract any part of its manufacturing.
What’s in the Box?
- Two sample cuvettes and caps
- Six powder reagents
- One 1.5V AAA battery
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Top Customer Reviews
|Length: 4:01 Mins|
The biggest challenge for me was to get the reagent out of the powder pillows. It's a technique one develops with time.
Work above a disposable surface (paper towel) or one that's easily cleaned. You will spill reagent powder and/or water.
1. with the pillow in a vertical position, lightly "massage" it to make sure there is no powder in the upper part;
2. cut the pillow about 1cm below the top (ignore the printed line); make sure you hold the pillow away from you, don't breathe the powder that may come off when you cut;
3. bring the corners of the pillow together, while pinching open the lips and forming a diamond shape; this is the most difficult step and will take practice;
4. pour the powder patiently in the cuvette, tapping the powder pillow lightly against the cuvette; at first it will be difficult to avoid reagent spills but in time you will get better.
As shown in the video, do steps 1-3 before anything else so you don't have to worry about time.
My gripes are:
1) Has an auto-off setting, and if you're trying to get the reagent to dissolbe (manual recommends 2 minutes of shaking) it might turn off, AFTER youve zerod with an unreacted sample. So you better have a second vial ready with unreacted sample, or you're hosed.
2) The powdered reagents are difficult to get out. I use this method:
My method is to cut off the top (after ive pinched and flicked the packet to make sure all the powder is away from the cut line), open the entire packet till the only seal remaining is on the bottom, fold the packet longways (perpendicular to the bottom seal) and pinch the bottom half closed into a "v" where the powder can collect.
Once you get the method down, it works OK, but what I wouldn't give for a liquid reagent...
The sample bottle and added powdered regent have to be shaken intermittently for three minutes. After that time elapses, I put the second sample bottle filled with water from the source to be tested in the iron tester for calibration. Then, the test sample goes in. I set an external timer for 3 minutes. I have forgotten to check after the three minute tester countdown. It powers off automatically requiring a retest if you miss the results. A kitchen timer fixes that problem.
Nice to be able to test iron in my aquaponics system. This is a nutrient that is supplemented since it is not naturally present in fish tank water.
Most Recent Customer Reviews
I appreciate that Hanna is developing reasonably priced equipment. I regularly compare the results with my grossly overpriced Hach test kit and am amazed at its accuracy. Read morePublished 1 month ago by Arroyo Toad
Seems to work. Apparently I don't have iron in my water. HahaPublished 2 months ago by Geoff Reynolds
Worked well, helped determine what system to install to clean up high iron content.Published 7 months ago by DBMechEng
Meter is fast, simple and accurate. Test kit are a joke. Buy the meter if you really want to know what's going on.Published 13 months ago by LC
We did not detect any iron in our water sources or bottled water. We changed the project to measure iron in water boiled in a cast iron skillet. It worked perfectly.Published on February 8, 2014 by ScienceMom