Global Water 800-876-1172 • globalw.com Global Water Instrumentation, Inc.
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.
Global Water 800-876-1172 • globalw.com 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.
Global Water 800-876-1172 • globalw.com II. Sensor Specifications a. Specifications. Outputs: Ranges: Accuracy: Pressure: Power Requirements: Warm Up Time: Operating Temperature: Storage Temperature: Dimensions: Weight: Two, 4-20mA 0-50 NTU (Green Wire) 0-1000 NTU (White Wire) 1% of full scale 30 psi maximum 10-36 VDC 20ma plus sum of both 4-20mA outputs 3 seconds minimum 8 seconds recommended 0°C to +50°C -10°C to +60°C 1-1/2" diameter x 7-1/2”" long 1 lb plus cable b.
Global Water 800-876-1172 • globalw.com III. Trouble Shooting There are no user serviceable parts inside this sensor Issue: Sensor reading incorrectly a. Clean the sensor windows using a lint free cotton swab and rubbing alcohol. b. Verify there are no air bubbles blocking the lenses. c. Check the sensor’s calibration, see appendix A. Other issues d. Refer to the manual for proper set-up; check all connections and batteries. e.
Global Water 800-876-1172 • globalw.com IV. Warranty a. Global Water Instrumentation, Inc. warrants that its products are free from defects in material and workmanship under normal use and service for a period of one year from date of shipment from factory. Global Water’s obligations under this warranty are limited to, at Global Water’s option: (I) replacing or (II) repairing; any products determined to be defective. In no case shall Global Water’s liability exceed the products original purchase price.
Global Water 800-876-1172 • globalw.com V. Appendix A: Turbidity Sensor Calibration Note: The following steps show how to calibrate the WQ730 Turbidity Sensor using suspended polymer turbidity standards only. General a. The Turbidity Sensor is measuring turbidity in liquids by using a 90 degrees scatter nephelometer where a focused beam is directed into the monitored water. The principle is based on recommendations of the international guideline ISO 7027.
Global Water 800-876-1172 • globalw.com Preparation: a. Set up a test stand with a rod and clamp to hold the sensor. Beakers will be placed underneath the clamp so the sensor can be inserted into the liquid. b. The sensor must have the stainless steel section of the body in contact with the test solution. Install the sensor so that the end of the sensor is at least 3 inches from the bottom.
Global Water 800-876-1172 • globalw.com Checking Calibration Step 1) Connect the sensor to the power supply and current meter in the following way. Attach the black wire to the ground terminal of the power supply. Attach the white wire to the positive current input of the meter. Connect the ground terminal of the power supply to the ground input of the current meter. Check that the power supply is set between 10 and 30 volts DC. Attach the red wire to the positive terminal of the power supply.
Global Water 800-876-1172 • globalw.com Step 7) Remove the sensor and rinse in distilled water. Dry the sensor and clean the lenses with alcohol. Step 8) Disconnect the green wire and connect the white wire to the positive input of the current meter. Step 9) Place the sensor in the clamp above the 1000 NTU solution. If necessary, use a lint free cotton swab bent at 90º to remove any air bubbles from underneath the detector window. Step 10) Record the output current of the sensor, 1000NTU = _______.
Global Water 800-876-1172 • globalw.
Global Water 800-876-1172 • globalw.com Declaration of CE Conformity Global Water Instrumentation, Inc. 11390 Amalgam Way Gold River, CA 95670 USA FAX: 00 1 916 638 3270 Phone: 00 1 916 638 3429 declares that the Product: Product Name: Turbidity Sensor and Turbidity Meter Model Number: WQ730, WQ770 conforms to the following European Council directives: Low Voltage Directives: 2006/95/EC; Requirements covering all health and safety risks of electrical equipment operating within certain voltage ranges.
