Global Water 800-876-1172 • globalw.com Global Water Instrumentation, Inc. 151 Graham Road P.O. Box 9010 College Station, TX 77842-9010 T: 800-876-1172 Int’l: (979) 690-5560, Fax: (979) 690-0440 E-mail : globalw@globalw.
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.
Global Water 800-876-1172 • globalw.com 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 verified at Global Water’s facility prior to shipping, there is no need to recalibrate the meter until the recommended maintenance period has elapsed. II. Inspection The Turbidity Meter was carefully inspected and certified by our Quality Assurance Team before shipping.
Global Water 800-876-1172 • globalw.com 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.
Global Water 800-876-1172 • globalw.com a. Battery life is dependent on many variables. Extreme heat and extreme cold will shorten the life of a battery. A WQ770 in an environment that has a sustained temperature of 23°C will run 5% longer than a unit that has a sustained temperature of 0°C. Store your WQ770 at room temperature and disconnect the battery when not in use for long periods of time. b. The Turbidity Meter battery will operate for 15 hours. The meter will automatically shut off after 6 minutes.
Global Water 800-876-1172 • globalw.com a. Clean the sensor windows using a lint free cotton swab and rubbing alcohol. b. Verify there are no air bubbles under the sensor shield. c. Check the meter’s calibration. Other issues d. Call Global Water for tech support: 800-876-1172 or (979) 690-5560 (many problems can be solved over the phone). Fax: (979) 690-0440 or E-mail: globalw@globalw.com. When calling for tech support, please have the following information ready; 1. 2. 3. 4. 5. Model #.
Global Water 800-876-1172 • globalw.com Send the package with shipping prepaid to our factory address. Insure your shipment, Global Water’s warranty does not cover damage incurred during transit. VII. 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 800-876-1172 • globalw.com VIII. Appendix A: Turbidity Meter Calibration Note: The following steps show how to calibrate the WQ770 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. If the sensor is too close to the bottom, infrared light may be reflected from the glass and effect the measurements.
Global Water 800-876-1172 • globalw.com Calibration a. If the sensor is not connected to the meter, push the cable connector gently into the meter’s connector. The outer connector ring should be turned and locked into place so the cable will not detach from the meter during use. b. To enter the meter’s calibration screens hold the Menu/On button for 3 seconds. The first menu screen is for selecting the range. Use the Down arrow key to select 50 NTU then press the Save button. c.
Global Water 800-876-1172 • globalw.com i. The HiLab screen displays the correct NTU reading for the solution used in the HiSig calibration step. For 50 NTU solution, press the arrow keys until the display reads 50 NTU. Press the Save button to record the HiLab unit. Press the Menu/On button to move to the next menu. j. The delay screen indicates the time the meter will take to average sensor readings. This should be set 5 seconds for the best results.
