TM 10-4610-310-14
WP 0019 00
SOURCES OF INTERFERENCE
The following instructions should prevent any interference in accurate measurements:
1. Presence of floating debris and coarse sediment that settle out rapidly will give false readings.
2. The infrared light source used for the HI 93703 turbidity meter, or equal, according to International Standard
Organization (ISO) 7027, can effectively minimize errors due to colored dissolved substances. This effect,
called "true color", is a common interference for most commercially available instruments operating in the
range of visible light.
3. Air bubbles and the effect of vibrations that disturb the surface of the sample will give false results.
4. Dirty glassware could affect readings along with scratched or edged cuvets.
BATTERY REPLACEMENT
The meter is equipped with an automatic shut off function that turns the meter off after 4 minutes of
nonuse. The power source is four 1.5V AA batteries with an expected life of 60 hours or over 900
measurements. The batteries are monitored to ensure that readings are not taken when there is
insufficient power.
Two indications on the meter will inform the operator that the batteries require replacement:
LO BAT indication appears on the lower right hand side of the display when the batteries are weak
and require replacement. At this point the meter is able to perform only 50 more measurements. See
error codes.
-BA- - indication appears on the display when the batteries are too weak to perform measurements; the
message appears for a few seconds, and then the meter will automatically switch off. At this point, it is
absolutely necessary to replace the batteries to use the meter. See error codes.
Battery replacement must be done in a non-hazardous area with the correct type of battery. To replace the
batteries:
1. Turn the meter off. Press the ON/OFF key to OFF.
2. Unscrew the two screws on the back of the battery cover.
3. Remove the battery cover to expose the battery compartment.
4. Remove four unserviceable batteries from location.
5. Install four new batteries into proper position. Always replace all four batteries at the same time. Observe
proper polarity.
6. Replace the battery cover on the back of the meter.
7. Tighten two screws to secure battery cover.
VIEWING THE CALIBRATION DATE
1.
Turn the meter on. Press ON/OFF key to ON. Pause for the instrument display to show " - - - -".
Press and hold the DATE/⇒ key. A "MM.DD" message will appear while the key is held.
2.
NOTE
The displayed date is the date that was input by the operator at the beginning of the last
3.
Calibrate the turbidity meter according to WP 0048 00.
0019 00-4
