TM 10-4610-310-14
0005 00
SOURCE WATER TURBIDITY MEASUREMENT
1. The operator will measure source water turbidity with the portable microprocessor turbidity meter HANNA HI
93703. Make sure the four 1.5 volt AA batteries are installed. The turbidity measurement unit is the
Formazine Turbidity Unit (FTU). This unit is identical to Nephelometric Turbidity Unit (NTU).
2. Press the ON/OFF key to turn the turbidity meter on. The meter will conduct a self-test at this time. See
Figure 1.
3. After the test, the Liquid Crystal Display (LCD) will change to the measurement mode. When the LCD
displays (- - - -) the meter is ready to measure.
4. Remove black cap from cuvet. If cuvet has a clear plastic insert in the opening, remove and discard.
5. Rinse a cuvet three times with water to be tested. Then fill the cuvet up to 10 ml mark on the cuvet. See
Figure 2.
Figure 2. Cuvet
6. Allow sufficient time for bubbles to escape and then secure the cap.
CAUTION
Do not over tighten the cap. Damage may result if cap is tightened too much.
7. Wipe the cuvet thoroughly with a lint-free blue cloth (HI 93703-70), or equal, before inserting the cuvet into
the measurement cell.
8. The cuvet must be completely free of fingerprints and other oil or dirt, particularly in the area where the light
goes through (approximately 1 inch (2.54 cm) from the bottom of the cuvet).
9. Place the cuvet into the measurement cell. Make sure that the notch on the cap is positioned securely into
the cover. Line up the arrow on the cap with the arrow on the turbidity meter. See Figure 3.
Figure 3. Correct Position of Cuvet Cap in Turbidity Meter
