Xylem WQ730 User Manual

Global Water

800-876-1172 • globalw.com

02-002
11/30/09

Global Water

Instrumentation, Inc.

11390 Amalgam Way

Gold River, CA 95670

T: 800-876-1172

Int’l: [phone], F: [phone]

Turbidity Sensor: WQ730

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Global Water

800-876-1172 • globalw.com

Congratulations on your purchase of the Global Water WQ730
Turbidity Sensor. This instrument has been quality tested and
approved for providing accurate and reliable turbidity
measurements. We are confident that you will find this product to
be a valuable asset for your application. Should you require
assistance, our technical staff will be happy to help.

Table of Contents

I. Use and Maintenance • • • • • Page 3
II. Sensor Specifications • • • • • 4
III. Troubleshooting • • • • • • 5
IV. Warranty • • • • • • • 6
V. Appendix A: Turbidity Sensor Calibration • • 7
VI. Appendix B: Turbidity Standard Solutions • • 10
VII. Appendix C: Sensor Measurement Diagram • • 11

VIII. CE Certification • • • • • • 12

Copyright © Global Water Instrumentation, Inc. 2009

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I. Use and Maintenance

a. The WQ730 Turbidity Sensor is a sensitive optical device and should

be handled and used carefully. Avoid hitting or dropping the sensor.
Avoid exposure to shock, vibration, extreme hot or cold temperatures,
or sudden wide temperature changes. Transport the sensor in a safe
and dry enclosure.

b. Normal maintenance requires the sensor to be checked on a regular

basis. Harsh environments can permanently damage the optics of the
sensor if it is left untended for long periods of time.

c. Deposits will develop on the optics over time and should be cleaned

every 2-3 days for best operation. The windows can be cleaned using
lint free cotton swabs and rubbing alcohol. Do not use any abrasive
cleaners on the lenses or permanent damage will occur. Cleaner
water requires cleaning less often, in other applications the sensor
may need to be cleaned once each day.

Global Water

800-876-1172 • globalw.com

d. The calibration of the sensor should be checked every 6 months.
e. Always turn off the power when making circuit connections.
f. Air bubbles on the lenses can greatly affect the readings. When

installing, make sure that any bubbles are clear of the lenses or allow
them dissipate before taking readings.

g. Under no circumstances should the sensor be disassembled. There

are no internal adjustments or user serviceable parts inside. Opening
the housing will permanently damage the seals and can cause serious
damage to the optics. Opening the sensor will void any warrantee.

h. The stainless steel body of the WQ730 Sensor is connected to the

circuit ground. When taking measurements, the body of the sensor
must be in contact with the test solution or noise problems may occur.

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II. Sensor Specifications

a. Specifications.

Outputs: Two, 4-20mA
Ranges: 0-50 NTU (Green Wire)

Accuracy: 1% of full scale
Pressure: 30 psi maximum
Power Requirements: 10-36 VDC
20ma plus sum of both 4-20mA outputs
Warm Up Time: 3 seconds minimum

Operating Temperature: 0°C to +50°C
Storage Temperature: -10°C to +60°C
Dimensions: 1-1/2" diameter x 7-1/2”" long
Weight: 1 lb plus cable

Global Water

800-876-1172 • globalw.com

0-1000 NTU (White Wire)

8 seconds recommended

b. Connections:

Red: 10-36 VDC
Black: Ground
Green: 4-20 mA low range output (50 NTU)
White: 4-20 mA high range output (1000 NTU)

Note: The stainless steel body of the sensor is connected to
the circuit ground and must be in contact with the test
solution.

Warning: Always turn off the power when connecting or disconnecting

the sensor or it could be damaged.

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