Product Overview:
Measurement range: 0.00 to 2.70 mg/L (ppm) CaCO3
Adopting innovative optical system design, with good accuracy, repeatability, and measurement time required, the carefully designed CAL Check ™ The function allows for performance validation of instruments using NIST traceable standards, with multiple measurement methods available. Users can choose to use customized specialized reagents, built-in reaction timers to ensure consistency between sample measurements and user results, battery status indicator lights, and automatic shutdown settings. It is suitable for industries such as water quality, environment, electroplating, and education.
Performance characteristics
All water except distilled water contains dissolved salts (magnesium carbonate and calcium carbonate), and the concentration of these salts determines the hardness of the water, expressed as the concentration of magnesium carbonate and calcium carbonate.
The sum of the concentrations of these two salts represents the total hardness of water. The reason for the presence of dissolved salts is that water comes from groundwater, which is formed by rainfall.
In addition, hardness is also related to the rusting and scaling of pipelines in many industries, such as water heating and cooling systems, infiltration systems, and desalination plants.
The calcium [Ca] hardness spectrophotometer has a combination of narrowband interference filter and silicon photodetector optical system, ensuring accurate measurement readings every time; Carefully designed CAL Check ™ The NIST traceable calibration group for HI720-11 calcium [Ca] hardness is used to verify the performance status of the HI720 calcium [Ca] hardness spectrophotometer. The dedicated colorimetric cup locking design ensures that the colorimetric cup is inserted into the same position in the measuring unit each time to maintain a consistent path length for accurate results,
It is simple and convenient to add reagents to the water sample to be tested. The reagents will react with calcium [Ca] in the water sample to be tested. Based on the color change after the reaction between the reagents and the water sample, the calcium [Ca] hardness concentration value can be determined by a calcium [Ca] hardness spectrophotometer.
Built in timer - ensures that the tested water sample and calcium [Ca] hardness reagent react according to the internally set standard time. At the end of the timer, the instrument will automatically read the reading, ensuring consistency in reaction time across multiple batches of measurements.
Error messages - warning issues on the display screen, including unlimited, out of range, and under range readings, as well as light source errors;
Automatic shutdown - measurement mode does not require automatic shutdown for 10 minutes;
Technical Specifications
HI720 Calcium [Ca] Hardness
measurement range
0.00 to 2.70 mg/L（ppm） MgCO3
resolution
0.01 mg/L
Accuracy @ 25 ° C (77 ° F)
Reading ± 5% ± 0.20 mg/L (mg/L)
optical system
Narrowband interference filter, silicon photovoltaic cell, LED @ 525 nm
Method Standard
Refer to Standard Methods for Water and Wastewater, 18th edition, Calcium Magnesium Reagent Method
Power mode
1 x 1.5V battery
Auto Shutdown
Measurement mode does not require automatic shutdown for 10 minutes
Applicable Environment
0 to 50 °C（32 to 122°F ）； RH-max95%（无冷凝）
Size and Weight
Host size: 86.0 mm x 61.0 mm x 37.5 mm (3.4 "x 2.4" x 1.5 "), host weight: 64 g (2.25 oz.)
Exclusive attachments
HI731315 specialized glass colorimetric dish (cup+lid)
HI720-25 customized special calcium [Ca] hardness reagent, predicted 25 times
HI720-11 Calcium [Ca] Hardness NIST Measurement Curve Calibration Group, Standard Values @ 25 º C: 0.0 and 1.50 ± 0.25 mg/L (ppm) CaCO3
Standard configuration:
HI720
Host, HI720-25 customized calcium (Ca) hardness reagent, HI731315 customized glass colorimetric dish (2 pieces), HI731318 customized glass colorimetric dish cleaning cloth (2 pieces), Chinese and English user manual, HI721025 customized carrying case [Warm reminder: For the convenience and speed of adding samples, please purchase HI740157P specialized microplastic straws (20 pieces/group) for the extraction of test samples and to avoid cross contamination]
HI720C
Host, HI720-25 customized calcium (Ca) hardness reagent, HI720-11 customized NIST calcium (Ca) hardness standard verification group, HI731315 customized glass colorimetric dish (2 pieces), HI731318 customized glass colorimetric dish cleaning cloth (2 pieces), Chinese and English user manual, HI721025 customized carrying case [Warm reminder: For the convenience and speed of adding samples, please purchase HI740157P specialized microplastic straws (20 pieces/group) for the extraction of test samples and to avoid cross contamination]
