Xylem WQ770-B User Manual

Global Water

800-876-1172 • globalw.com

Publication Number 38900512

Global Water

Instrumentation, Inc.

151 Graham Road

P.O. Box 9010

College Station, TX 77842-9010

T: 800-876-1172

Int’l: [phone], Fax: [phone]

E-mail : [e-mail]

Turbidity Meter: WQ770

- 1 -

Global Water

800-876-1172 • globalw.com

Congratulations on your purchase of the Global Water WQ770
Turbidity Meter. This instrument has been quality tested and
approved for providing accurate and reliable turbidity
measurements. We are confident that you will find the WQ770 to
be a valuable asset for your application. Should you require
assistance, our technical staff will be happy to help.

Table of Contents

I. Checklist • • • • • • • Page 3
II. Inspection • • • • • • 3
III. WQ770 Operation • • • • • 4
IV. Battery Life and Replacement • • • • 5
V. Maintenance • • • • • • 5
VI. Troubleshooting • • • • • • 6
VII. Warranty • • • • • • • 7
VIII. Appendix A: WQ770 Calibration Procedures • • 8
IX. Appendix B: Turbidity Standard Solutions • • 11

* Copyright  Global Water Instrumentatio n, I nc. 2012

- 2 -

I. WQ770 Checklist

a. Turbidity Meter
b. Turbidity Sensor
c. 9V Lithium Battery (Inside Turbidity Meter Enclosure)
d. WQ770 Manual
The Turbidity Meter has been calibrated and ver ified at Global Water’s

facility prior to shipping, ther e is no need to recalibrate the meter until the
recommended maintenance period has elapsed.

II. Inspection

The Turbidity Meter was carefully inspect ed and c er tified by our Quality
Assurance Team before shipping. If any signific ant damage has occurred
during shipping, please notify Global Water Instrumentation, Inc . and f ile a
claim with the carrier involved.

Use the checklist to ensure that you hav e r ec eived every thing needed to
operate the WQ770.

Global Water

800-876-1172 • globalw.com

- 3 -

III. WQ770 Operation

a. Before turning the unit on, make sur e 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 fr om the meter and verify that a 9V lithium

battery is installed in the unit. Replace t he battery cover.

c. P r es s 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 t o s elec t either the
0-50 or the 0-1000 NTU range then press Save.

Global Water

800-876-1172 • globalw.com

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 m ode. 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 r eadings . These air bubbles
must be avoided when placing the sensor in the wat er .

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 wat er will c aus e acceler ated aging of the

sensor optics and seals. Warning: Do not expose the sen sor to
water exceeding 50°C.

IV. Battery Life And Replacement

- 4 -