This document is an instruction manual for Hanna Instruments products. It describes the features and usage of the product, and provides common errors and warnings information.
The Hanna Instruments HI 775 is a portable colorimetric meter designed to measure alkalinity in fresh water samples. The device utilizes a light-emitting diode at 610 nm as the light source and a silicon photocell detector to determine concentration based on color development from yellow to blue.
| Range | 0 to 500 ppm |
|---|---|
| Resolution | 1 ppm |
| Accuracy | +5% of reading +5 ppm @ 25°C |
| Light Source | LED @ 610 nm |
| Light Detector | Silicon Photocel |
| Battery Type | 1x 1.5V AAA Battery |
The instrument uses a colorimetric method where the reaction causes a distinctive range of colors from yellow to blue to develop.
A blinking '0' indicates that the sample absorbs less light than the zero reference, suggesting inverted cuvettes.