Xylem WQ770-B TURBIDITY METER - Manual (Page 4)

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III. WQ770 Operation
a. Before turning the unit on, make sure that the sensor cable has
correctly been attached to the display. Push the cable connector
gently into the meter’s connector. The outer connector ring can be
turned and locked into place so the cable will not detach from the
meter during use.
b. Remove the battery cover from the meter and verify that a 9V lithium
battery is installed in the unit. Replace the battery cover.
c. Press the Menu/On Button. This brings up the display that shows the
output from the turbidity sensor.
d. Press and hold the Menu/On button for 3 seconds to display the
Range menu. Use the Up/Down arrow buttons to select either the
0-50 or the 0-1000 NTU range then press Save.
e. Press the Menu/On button again and use the Up/Down arrow keys to
select units of NTU or ppm then press Save. Pressing the Menu/On
button 6 more times returns to normal display mode. The other menu
items are used for calibration and are described in Appendix A.
f. Place the sensor in the water to be tested. The meter will display the
turbidity of the water. Warning: Air bubbles in the water or under the
sensor shield will cause errors in the readings. These air bubbles
must be avoided when placing the sensor in the water.
g. The Turbidity Meter will automatically shut off after 6 minutes. To
continue reading the display past this time press the Menu/On button
prior to the meter shutting off.
h. Prolonged immersion in hot water will cause accelerated aging of the
sensor optics and seals. Warning: Do not expose the sensor to
water exceeding 50°C.
IV. Battery Life And Replacement