TM 10-4610-310-14
OPERATOR INSTRUCTIONS
LIGHTWEIGHT WATER PURIFIER
TURBIDITY METER
GENERAL
This work package provides information and operating instructions for the Hanna Model HI 93703 portable,
microprocessor turbidity meter. The meter is used in the field as a hand-held, microprocessor-based, battery
operated instrument to determine the turbidity of the water. The meter has a 0 to 1000 Formazine Turbidity Unit
(FTU) range in two scales: 0.00 to 50.00 FTU and 50 to 1000 FTU. See WP 0005 00 for water analysis
instructions.
NOTE
The FTU is identical to the other international recognized unit Nephelometric Turbidity Unit
(NTU).
The meter is housed in a rugged and lightweight case with easy to read Liquid Crystal Display (LCD).
The meter is equipped with an automatic shutoff feature activated after 4 minutes of nonuse. All
operations are performed with only four keys. A positive locking system ensures that the cuvet (small
glass container) is firmly placed in the cell. The keypad is water-resistant and can be wiped with a moist
cloth for cleanup. The one-point calibration at 10 FTU's is performed using the available standard. The
last calibration date is stored and can be retrieved at the operator's convenience.
See WP 0048 00 for calibration procedure. Troubleshooting functions are performed with displayed
error code guides.
The meter functions by passing a beam of infrared light through a cuvet containing the sample being
measured. A sensor, positioned at 90 with respect to the direction of light, detects the amount of light
scattered by the undissolved particles present in the sample. The microprocessor converts such
readings into FTU values. See Figure 1.
CUVET WITH CAP
Figure 1. Turbidity Meter.
