HI97750 is an advanced portable photometer for the measurement of potassium 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.
Potassium is a chemical element commonly found in nature. It is present in soil and drinking water and is also an essential element for the growth of plants and animals. Potassium concentration is important in determining the quality of soil in many greenhouse, agriculture, and horticulture applications. Potassium salts are also a common component of fertilizers.
The HI97750 uses an adaptation of the tetraphenylborate method to measure potassium concentrations up to 20.0 mg/L (ppm) potassium in the low-range and 100 mg/L potassium in the medium-range. When the reagent is added to samples containing potassium, the sample will become turbid; the greater the concentration, the greater the turbidity. 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 potassium determination, a narrow band interference filter at 466 nm (blue) allows only blue 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.
The HI97750 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.
HI97750 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.
Chemical Forms
Results can be displayed in multiple chemical forms.
Tutorial Mode
Tutorial mode for step-by-step instructions to guide a first-time user in how to perform a measurement correctly.
Reaction Timer
Built-in reaction timer that ensures consistency amongst multiple users.
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 | HI97750-web |
|---|---|
| Product Name | Potassium Low and Medium-Range Portable Photometer with CAL Check – HI97750 |
| Quote Required | Yes |
| Potassium Range | 0.0 to 20.0 mg/L (as K); 10 to 100 mg/L (as K) |
| Potassium Resolution | 0.1 mg/L |
| Potassium Accuracy | ±3 mg/L ±7 % of reading at 25°C; ±10 mg/L ±7 % of reading at 25°C |
| Potassium Method | Adaptation of the Turbidimetric Tetraphenylborate Method |
| Photometer/Colorimeter Light Source | LED with 466 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 |
| Display | 128 x 64 pixel B/W LCD with backlight |
| 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 | HI97750C 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. |
