WQ710 Turbidity Sensor User Manual
Contents
1. Global Water 800 876 1172 e globalw com Global Water Instrumentation Inc 11390 Amalgam Way Gold River CA 95670 T 800 876 1172 Int l 916 638 3429 F 916 638 3270 Turbidity Sensor WQ710 00 218 7 20 2008 Global Water 800 876 1172 e globalw com Congratulations on your purchase of the Global Water WQ710 Turbidity Sensor This instrument has been quality tested and approved for providing accurate and reliable turbidity measurements We are confident that you will find the WQ710 to De a valuable asset for your application Should you require assistance our technical staff will be happy to help Table of Contents l Use and Maintenance e Page 3 I Sensor Specifications e 4 lll Troubleshooting e I 5 IV Warranty e 6 V Appendix A Calibration Procedures e 7 VI Appendix B Sensor Measurement Diagram 11 Copyright Global Water Instrumentation Inc 2008 Global Water 800 876 1172 e globalw com Use and Maintenance a The WQ710 Turbidity Sensor is a sensitive optical device and should be handled and used carefully Avoid hitting or dropping the sensor Do not expose it to vibration bright light extreme temperatures or Sudden temperature changes Transport the sensor with the light Shield on and in a safe dry enclosure The WQ710 is not intended for use in long term monitoring applications Normal maintenance requires the sens2. Refer to the manual for proper set up check all connections and batteries e Callus for tech support 800 876 1172 or 916 638 3429 many problems can be solved over the phone Fax 916 638 3270 or Email globalw globalw com f In the event that the equipment needs to be returned to the factory for any reason please call to obtain a RMA Return Material Authorization Do not return items without a RMA displayed on the outside of the package Clean and decontaminate the WQ710 when necessary Include a written statement describing the problems Send the package with shipping prepaid to Global Water s factory address Insure the shipment as the warranty does not cover damage incurred during transit g When calling for tech support please have as much of the following information as possible Model Unit serial number P O the equipment was purchased on Global Water s sales number or the invoice number Repair instructions and or specific problems relating to the product on WN Global Water 800 876 1172 e 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 s
3. X ona Hc This current is the output current the sensor would produce if the solution were 50 NTU Use these new current values to recalibrate the system that is monitoring the sensor output 1000 NTU Step 12 Step 13 Step 14 The low current value for the sensor is equal to W This current is the output current the sensor will produce if the solution was 0 NTU The high current value for the sensor is equal to Z This current is the output current the sensor will produce if the solution was 1000 NTU Use these new current values to recalibrate the system that is monitoring the sensor Global Water 800 876 1172 e globalw com iagram WQ710 Sensor Measurement D ix B Append VI T gO 1 uS DAp 1000 Nd HIX AQ UMOUG cd Ze E 2400 S 10000 v ubJ olp puawaunsoaw vOSUaS NIZOM ail AWI uos U 40 4lA CNLNOS O gt uaaa ayy puo CNLNOOOT O aym y 438UU0D ON OG 3LON andano vu 02 p Suosuas ay WOug SHOA GZ 04 S DJAO4d M SWYO Get jO esuvysisau y 4oysisau doup aGvz 0A 0 apoad o p u nod pou S JOA uj 4 j u YZIM aunsvau O Yapuad UI wouBvig a607 0A 3AM apOW UJANI Up UIJ WJINW IUL YFM POJA eq 04 Soy PUY yUauUND s YOSUaS ayy jO yhnd no ul woulo PUeUUNQ 4JIA 0226 869 956 XVI 6Zr 8 889 916 YSA DJ tany P109 PU TUNOJ 4973 swazshig SAATUS s 0sua 11
4. 18 to 20 mA 50 NTU range 17 to 20 mA These adjustments are done internally without access from the outside However sensors should not be disassembled without knowing the proper procedure otherwise damage can occur Global Water 800 876 1172 e globalw com Checking Calibration Step 1 Step 2 Step 3 Step 4 Step 5 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 input of the current meter Connect the ground terminal of the power Supply to the ground of the current meter Attach the red wire to the positive terminal of the power supply Warning Always hook up the red wire last or the sensor may be damaged Place the turbidity sensor in the distilled water beaker Turn on the power supply and the current meter Let the sensor Stabilize for 5 minutes before taking any measurements Use a lint free bent cotton swab to remove any air bubbles from underneath the detector window Record the output current of the sensor W ____ Disconnect the white wire and connect the green wire to the positive input of the current meter Let the sensor stabilize for a minute Record the output current of the sensor X Remove the sensor and shake water off Place the sensor in the clamp above the 40 NTU solution Lower the clamp and dip the sensor into the solution Place the sensor at the edge of the be
5. Connecting wires as necessary The two primary turbidity standards are Formazin and Formazin StabICAl which is the nontoxic and long term stable Note Global Water sells none of the supplies listed above Cole Parmer is a recommended source for these supplies Global Water 800 876 1172 e globalw com Preparation c Putup 2 teststands each one consisting of 1 magnetic stirrer and 1 stand with rod and clamp to hold the sensor The stirrer is placed underneath the clamps so the sensor can be inserted into the liquid d Place one 500 ml beaker with 1 000 NTU Formazin on one stirring plate and one 500 ml beaker with 40 NTU Formazin on the other stirring plate e Stir the Formazin for about 30 minutes prior to testing Formazin settles while it is stored this will mix up the solution evenly Note The vortex should not be more than 1 deep or this will cause bubbles in the solution f The third 500 ml beaker is for distilled water and is used as zero NTU reference g Fill the large 1000 ml beaker with tap water This beaker is used for washing the sensor when transferring it from one solution into another Intermediate washing reduces cross contamination This is especially important if a sensor is transferred from a high turbidity solution into a low turbidity solution Note The sensor is factory adjusted and will provide output currents at the maximum turbidity values close to 20 mA Typical values are 1 000 NTU range
6. aker with the gap showing into the direction flow to enable free flow Avoid dipping the sensor into the vortex since air bubbles will give a false reading Wipe the detector window with a cotton swab to remove any air bubbles Let the sensor stabilize for 5 minutes before taking any measurements Record the output current of the sensor Y ______ Remove the sensor and rinse it off in the tap water Disconnect the green wire and connect the white wire to the positive input of the current meter Step 6 Step 7 Step 8 40 NTU Step 9 Step 10 Step 11 Global Water 800 876 1172 e globalw com Place the sensor in the clamp above the 1000 NTU solution Lower the clamp and dip the sensor into the solution Place the sensor atthe edge of the beaker with the gap showing into the direction flow to enable free flow Avoid dipping the sensor into the vortex since air bubbles will give a false reading Wipe the detector window with a cotton swab to remove any air bubbles Let the sensor stabilize for 5 minutes before taking any measurements Record the output current ofthe sensor Z ______ Remove the sensor and rinse it off in the tap water Subtract the distilled water current output from the 40 NTU current output Y X Cc The low current value for the sensor is equal to X This current is the output current the sensor will produce if the solution was 0 NTU Find the high current value for the sensor C 40 50
7. e to the optics Opening the sensor will void the warrantee Global Water 800 876 1172 e globalw com II Sensor Specifications a Specifications Outputs Two 4 20mA Ranges 0 50 NTU Green Wire 0 1000 NTU White Wire Accuracy 5 of full scale Pressure 30 psi maximum Power Requirements 10 36 VDC Warm Up Time 10 seconds minimum Operating Temperature 0 C to 50 C Storage Temperature 40 C to 50 C Dimensions 1 1 2 diameter x 9 long Weight 1 Ib plus cable The sensor is factory adjusted and will provide output currents at the maximum turbidity values close to 20 mA However these values will drift over time Typical values are 1 000 NTU range 18 to 20 mA 50 NTU range 17 to 20 mA These adjustments are done internally without access from the outside The sensor should never be disassembled otherwise damage can occur and any warrantee will be voided b Connections Red 10 36 VDC Black Ground Green 4 20 mA low range output 50 NTU White 4 20 mA high range output 1 000 NTU Warning Always turn off the power when connecting or disconnecting the sensor or it could be damaged III Global Water 800 876 1172 e globalw com Trouble Shooting 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 under the sensor shield c Check the sensor s calibration see appendix A Other issues d
8. hall Global Water s liability exceed the products original purchase price This warranty does not apply to any equipment that has been repaired or altered except by Global Water Instrumentation Inc or which has been subject to misuse negligence or accident b The warranty begins on the date of the product s invoice Global Water 800 876 1172 e globalw com Appendix A Turbidity sensor calibration Note The following steps show how to calibrate the Turbidity Sensor using the NTU standard 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 Two detectors receive light from a source emitting 880 nm infrared light in a pulsed mode One detector is placed opposite the source receiving the transmitted light and the other detector is placed at an angle of 90 degrees to the incident light beam measuring side scattered light The detected light intensity is directly proportional to the turbidity of the water b The following supplies are needed 2 magnetic stirrers Small plates of 4 x4 are sufficient 2 stands with rods and clamps 3 beakers 500 ml 1 beaker 1000 ml 2 Stirring bars 1 or 1 5 500 ml solution of 1000 NTU Formazin 500 ml solution of 40 NTU Formazin 500 ml distilled water 1 power supply 1 current meter
9. or 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 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 Exposure to clean water requires cleaning the lenses less often in other applications the sensor may need to be cleaned every day The calibration of the sensor should be checked every 6 months Always turn off the power when making circuit connections Prolonged immersion in hot water will cause accelerated aging of the sensor optics The reliability and life of the sensor can be affected Warning Do not expose the sensor to water exceeding 50 C Always use the sensor with the light shield installed This shield protects the optical assembly from stray light that would affect the readings as well as protecting it from damage Air bubbles on the lenses can greatly affect the readings When installing make sure that bubbles are clear of the lenses or allow them dissipate before taking readings To help dissipate these bubbles align the holes in the light shield with the slot between the lenses 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 damag
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