HI97736 is an advanced portable photometer for the measurement of total hardness and pH in water. This meter offers a superior optical system that utilizes a reference detector and narrow band interference filters for extremely fast and repeatable measurements.
The HI97736 measures two important water quality parameters: pH and total hardness. Total hardness refers to the presence of magnesium and calcium. Hardness from magnesium and calcium is common in groundwater due to rainwater dissolving these minerals as it flows or filters through the ground. Hardness reduces the effectiveness of soaps and detergents. It can also cause scaling of pipes including in cooling and heating systems.
The HI97736 offers two methods within one meter. pH determination uses the phenol red method; total hardness uses an adaptation of the Standard Methods for the Examination of Water and Wastewater, 23rd Edition, colorimetric method.
When the appropriate reagent is added to the sample, it will cause a color change. In most cases the greater the concentration in the sample the deeper the color. The associated color change is then colorimetrically analyzed according to the Beer-Lambert Law. This principle states that light is absorbed by a complementary color, and the emitted radiation is dependent upon concentration. For determination of pH and total hardness, a narrow band interference filter at 525 nm allows only green light to be detected by the silicon photodetector and omits all other visible light emitted from the LED. As the change in color of the reacted sample increases, absorbance of the specific wavelength of light also increases, while transmittance decreases. Using a pre-programmed curve a result is then displayed.
The HI97736 has an innovative optical system that offers superior performance in accuracy, repeatability, and the short amount of time it takes to perform a measurement. This compact, waterproof meter is extremely user friendly with a tutorial mode that walks the user graphically, step-by-step, in performing a measurement. The use of a backlit dot matrix LCD allows the use of virtual keys which makes the operation of the meter very intuitive including selecting different units of measure, reviewing GLP data, recalling the last 50 measurements, and customizing the meter to user preferences.
HI97736 is completely waterproof including the cuvette holder that is designed with ridges to protect the optical path from getting scratched by the cuvette and a gasketed battery compartment that holds three common AA batteries. The compact design fits comfortably in the hand for use in the field or on a table for benchtop use. The LCD is backlit for easy viewing under all conditions.
CAL Check
Advanced features including CAL-Check to verify performance and if necessary, recalibrate.
Setup Options
Setup options for meter personalization include date and time format, language, and enabling the tutorial mode.
Backlit Display
Backlit dot matrix LCD that offers an exceptionally intuitive user interface that is easy to read and understand.
Tutorial Mode
Tutorial mode for step-by-step instructions to guide a first-time user in how to perform a measurement correctly.
Multiple Chemical Forms
Display hardness results in multiple chemical forms.
Stable Light Source:
High Efficiency Light Source:
High Quality Filters:
Greater Light Yield:
A focusing lens collects all of the light that exits the cuvette, eliminating errors from imperfections and scratches that may be present in the glass. The use of the convex lens reduces the need for indexing cuvettes.
CAL Check Functionality:
Large Cuvette Size:
Intuitive Dot Matrix Display:
Auto-off Protection:
| SKU | HI97736-web |
|---|---|
| Product Name | Total Hardness and pH Portable Photometer with CAL Check – HI97736 |
| Quote Required | Yes |
| pH Range | 6.5 to 8.5 pH |
| pH Resolution | 0.1 pH |
| pH Accuracy | ±0.1 pH of reading at 25°C |
| pH Method | Adaptation of the Phenol Red Method |
| Hardness, Total Range | 0.00 to 4.70 mg/L (as CaCO3) |
| Hardness, Total Resolution | 0.01 mg/L |
| Hardness, Total Accuracy | ±0.11 mg/L ±5% of reading at 25°C |
| Hardness, Total Method | adaptation of the Standard Methods for the Examination of Water and Wastewater, 23rd Edition, Colorimetric Method |
| Hardness, Calcium Range | 0.00 to 2.70 mg/L (as CaCO3) |
| Hardness, Calcium Resolution | 0.01 mg/L |
| Hardness, Calcium Accuracy | ±0.11 mg/L ±5% of reading at 25°C |
| Hardness, Calcium Method | adaptation of the Standard Methods for the Examination of Water and Wastewater, 23rd Edition, Colorimetric Method |
| Hardness, Magnesium Range | 0.00 to 2.00 mg/L (as CaCO3) |
| Hardness, Magnesium Resolution | 0.01 mg/L |
| Hardness, Magnesium Accuracy | ±0.11 mg/L ±5% of reading at 25°C |
| Hardness, Magnesium Method | adaptation of the Standard Methods for the Examination of Water and Wastewater, 23rd Edition, Colorimetric Method |
| Photometer/Colorimeter Light Source | LED with 525 nm bandpass filter |
| Photometer/Colorimeter Light Detector | silicon photocell |
| Bandpass Filter Bandwidth | 8 nm |
| Bandpass Filter Wavelength Accuracy | ±1.0 nm |
| Cuvette Type | round 24.6 mm diameter (22 mm inside) |
| GLP | yes |
| Logging Memory | 50 readings |
| Battery Type/Life | 1.5 V AA Alkaline (3 pcs.) / > 800 measurements (without backlight) |
| Automatic Shut-Off | after 15 minutes of inactivity (30 minutes before a READ measurement) |
| Environment | 0 to 50°C (32 to 122°F); 0 to 100% RH (IP67) |
| Weight | 380 g (13.4 oz.) |
| Dimensions | 142.5 x 102.5 x 50.5 mm (5.6 x 4.0 x 2.0'') |
| Ordering Information | HI97736C is supplied with CAL-Check standards, cuvettes (2), caps (2), plastic inserts for cuvette, (2), scissors, cuvette cleaning cloth, 1.5V AA batteries (3), instruction manual, and instrument quality certificate packaged in a rugged thermoformed carrying case. |
