The HI 93703 Portable Microprocessor Turbidity Meter allows for high-precision turbidity measurements in both the field and the laboratory. The meter has a range of 0 to 1000 FTU, divided into two scales: 0.00 to 50.00 FTU and 50 to 1000 FTU. The auto-ranging feature automatically sets the appropriate range for the measurement. The HI 93703 is designed according to the ISO7027 International Standard, with the turbidity unit being FTU (Formazine Turbidity Unit), which is equivalent to the internationally recognized unit NTU (Nephelometric Turbidity Unit).
The HI 93703 is a portable, microprocessor-based instrument designed to determine the turbidity of water and wastewater according to ISO 7027 International Standard. It features an auto-ranging capability with two scales (0.00-50.00 FTU and 50-1000 FTU) and uses an infrared LED light source peaking at 890 nm to minimize interference from colored samples.
The manual details the operational guide, including how to insert batteries, turn on the device, and perform measurements using glass cuvettes. It also explains the calibration procedure, which supports one-point or three-point calibration using specific standard solutions (HI 93703-0, HI 93703-10, and HI 93703-50). Additionally, it covers troubleshooting sources of interference such as air bubbles, floating debris, and dirty glassware.
| Range | 0.00 to 50.00 FTU; 50 to 1000 FTU |
|---|---|
| Resolution | 0.01 and 1 FTU |
| Accuracy | ±0.5 FTU* or ±5% of reading (whichever is greater) |
| Light Source | Infrared LED peaking at 890 nm |
| Battery Type | 4 x 1.5V AA alkaline |
| Battery Life | Approx. 60 hours of use or 900 measurements |
| Dimensions | 220 x 82 x 66 mm (8.7 x 3.2 x 2.6") |
| Weight | 510 g (1.1 lb.) |
The instrument uses FTU (Formazine Turbidity Unit), which is equivalent to NTU.
A monthly calibration is recommended, though more frequent checks are suggested for greatest accuracy.
False readings can be caused by floating debris, air bubbles, vibrations disturbing the sample surface, and dirty glassware.
The turbidity value appears after approximately 25 seconds.