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Campbell OBS-3+, Instruction Manual

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Campbell OBS-3+ Instruction Manual Download Page 24

OBS-3+ and OBS300 Suspended Solids and Turbidity Monitors 

 

FIGURE 7-3.  Calibration certificate showing volts coefficients 

8.  Calibration 

8.1  Turbidity 

The normalized response of an OBS sensor to styrene divinylbenzene beads 

(SDVB) turbidity over the range from 0 to 4000 NTU is shown on FIGURE 

8-1.  As shown on the inset, the response function is contained within region 

‘A’, the linear region, of the universal response curve.  However, there is 

residual nonlinearity that is removed by calibration and by computation of 

Polynomial for 

Converting to 

NTU 

Polynomial for 

Converting to 

NTU 

Curve Type 

CSL 

14 

Summary of Contents for OBS-3+

Page 1: ...INSTRUCTION MANUAL OBS 3 and OBS300 Suspended Solids and Turbidity Monitors Revision 9 14 C o p y r i g h t 2 0 0 8 2 0 1 4 C a m p b e l l S c i e n t i f i c I n c...

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Page 3: ...ucts to CSI CSI will return such Products by surface carrier prepaid within the continental United States of America To all other locations CSI will return such Products best way CIP port of entry per...

Page 4: ...g container Campbell Scientific s shipping address is CAMPBELL SCIENTIFIC INC RMA _____ 815 West 1800 North Logan Utah 84321 1784 For all returns the customer must fill out a Statement of Product Clea...

Page 5: ...ore beginning work Wear a hardhat and eye protection and take other appropriate safety precautions while working on or around tripods and towers Do not climb tripods or towers at any time and prohibit...

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Page 7: ...urement Details 7 6 Specifications 8 7 Installation 9 7 1 Pre Deployment Tests 9 7 2 Mounting Considerations 10 7 2 1 Siting 10 7 2 2 Mounting Options 10 7 2 2 1 PVC Pipe 10 7 2 2 2 Cable Ties or Hose...

Page 8: ...B 1 CRBasic Examples B 1 B 1 1 CR1000 Example Program B 1 B 1 2 CR200 X Example Program B 2 B 2 Edlog Example B 3 C Electrical Connections Details C 1 D Datalogger Connection to a Relay D 1 Figures 5...

Page 9: ...sor to a wide range of SSC 26 11 5 Infrared reflectivity of minerals as a function of 10 Munzell value 27 C 1 Pin assignments for MCBH and MCIL wet pluggable connectors C 1 D 1 Wiring diagram for conn...

Page 10: ...Table of Contents iv...

Page 11: ...ific instruments The titanium body option option TB must be used if submersing the probe in seawater Using an OBS sensor with a stainless steel housing option SB in seawater voids the warranty and cau...

Page 12: ...nd mounting options 4 2 Use SCWin to Program Datalogger and Generate Wiring Diagram Short Cut is an easy way to program your datalogger to measure the sensor and assign datalogger wiring terminals The...

Page 13: ...S 3 and OBS300 Suspended Solids and Turbidity Monitors 3 When Short Cut opens select New Program 4 Select Datalogger Model and Scan Interval default of 5 seconds is OK for most applications Click Next...

Page 14: ...tage in units of Enter the Low Range Coefficients and High Range Coefficients according to your calibration sheet see Section 7 5 Calibration Certificate 6 After selecting the sensor click at the left...

Page 15: ...organic matter Ambient light rejection and low temperature coefficient 5 1 Applications OBS sensors are used for a wide variety of monitoring tasks in riverine oceanic laboratory and industrial settin...

Page 16: ...t suspended matter in water and turbidity from the relative intensity of light backscattered at angles ranging from 90o to 165o in clean water A 3D schematic of the main components of the OBS 3 is sho...

Page 17: ...6 Specifications It is also possible to purchase sensors configured to operate from 5 V power however the output span is limited to 2 5 V The sensor needs to be connected to a datalogger current mete...

Page 18: ...0 X CR23X 21X and CR7 Operating Temperature 0 to 40 C Sensor may be damaged if it is encased in frozen liquid Ranges Turbidity low high 250 1000 NTU 500 2000 NTU 1000 4000 NTU Mud1 5000 to 10 000 mg L...

Page 19: ...field installations 1 Connect the red and black wires in the cable supplied with the sensor to a 9 or 12 Vdc battery 2 Plug the cable into the sensor and connect a multimeter across the blue test lea...

Page 20: ...e OBS 3 OBS300 will fit inside a 1 25 in schedule 40 PVC pipe 7 2 2 2 Cable Ties or Hose Clamps The OBS 3 OBS300 can be mounted to a frame or post using large high strength nylon cable ties 7 6 mm 0 3...

Page 21: ...10X White High Range Signal Single ended Input Single ended Input Blue Low Range Signal Single ended Input Single ended Input Green Signal Ground AG Black Power Ground G G Red Power SW12V SW12V Clear...

Page 22: ...low input range The millivolt measurements are converted to NTU by using the coefficients provided on the Calibration Certificate We supply a calibration curve in units of both millivolts and volts se...

Page 23: ...3 and OBS300 Suspended Solids and Turbidity Monitors FIGURE 7 2 Calibration certificate showing millivolt coefficients Curve Type Polynomial for Converting to NTU Polynomial for Converting to NTU CSL...

Page 24: ...ene divinylbenzene beads SDVB turbidity over the range from 0 to 4000 NTU is shown on FIGURE 8 1 As shown on the inset the response function is contained within region A the linear region of the unive...

Page 25: ...meter cannot be used to calibrate a different model The standard values for calibrating OBSs are 125 NTU GFS Part No 8428 250 NTU GFS Part No 8429 500 NTU GFS Part No 8430 1000 NTU GFS Part No 8431 20...

Page 26: ...the dilution procedures the uncertainty in the NTU value of an SDVB standard is 1 of the value indicated on the standard bottle Consequently the NTU value of one liter of standard in an uncovered 100...

Page 27: ...calibration log sheet 2 Swap the DMM or datalogger test lead to the high range output lead white and record a 10 second average of the high range output Record the average output on the calibration lo...

Page 28: ...n which it is suspended can be accurately measured with volumetric glassware Of the three methods dry sediment calibration causes the greatest physical and chemical alteration of the sediment Alterati...

Page 29: ...the OBS sensor will be used sediment should be in a state where grinding sieving or pulverization does not change its particle size distribution Averaging DMM or datalogger with test leads 12 V gel c...

Page 30: ...ransfer it to the teacup Record the weight on the calibration log sheet and add about 10 cc of water from the suspender tub to the teacup and mix the water and sediment into a smooth slurry with the t...

Page 31: ...r there is a problem that requires attention 2 The Shake Test is done to determine if water has leaked inside the pressure housing Unplug the cable and gently shake the sensor next to your ear and lis...

Page 32: ...an A Scotch Brite scouring pad works well for most types of window fouling First wet the pad and then place it on a counter with a plastic laminate top so that the side of the pad is aligned with the...

Page 33: ...ize shape and color remaining constant particle area normal to a light beam will determine the intensity of light scattered by a volume of suspended matter Results of tests with sediment shown on FIGU...

Page 34: ...is to take a lot of water samples and analyze them in the laboratory This is not always practical during storms when the errors are likely to be largest Do not rely solely on OBS sensors to monitor su...

Page 35: ...e particle and the detector that backscatter decreases exponentially with increasing sediment concentration For mud this occurs at concentrations greater than about 5000 mg L 1 FIGURE 11 4 shows a cal...

Page 36: ...tests have shown that whiteness color and IR reflectivity are correlated Calcite which is highly reflective and white in color will produce a much stronger OBS signal on a mass concentration basis tha...

Page 37: ...7 Bubbles and Plankton Although bubbles efficiently scatter light monitoring in most natural environments shows that OBS signals are not strongly affected by bubbles Bubbles and quartz particles backs...

Page 38: ...ic sells two wipers from a third party manufacturer the Hydro Wiper C with its own controller or the Hydro Wiper D that is controlled by a datalogger 12 References Bohren C F and D H Huffman Absorptio...

Page 39: ...sample the environment or measurement procedure that produce unintended and unknown shifts in turbidity or SSC Sample Volume The water volume where the OBS infrared beam and suspended particles inter...

Page 40: ...o will water turbidity and as the concentration of dissolved light absorbing matter increases turbidity will decrease Turbidity operational definition NTU value is a number ranging from 0 to 10 000 th...

Page 41: ...for editing A 1 1 CRBasic Datalogger Use the following procedure to import Short Cut code into CRBasic Editor CR200 X CR1000 CR800 CR3000 CR5000 CR9000 X dataloggers 1 Create the Short Cut program fol...

Page 42: ...3 Click File Document DLD File Assuming the default paths were used when Short Cut was installed navigate to C CampbellSci SCWin folder The file of interest has a DLD extension Select the file and cl...

Page 43: ...Public A 2 B 2 C 2 i n NTUX 21 Define Data Tables DataTable Data_15m 1 1 DataInterval 0 15 Min 10 Sample 1 NTU FP2 EndTable Main Program BeginProg Declare Constants n 21 A 1 0 24763 B 1 105 69 C 1 0 2...

Page 44: ...Table Data_15m NextScan EndProg B 1 2 CR200 X Example Program The following example uses the voltage curve of the calibrations certificate provided in FIGURE 7 3 Since the coefficients of the voltage...

Page 45: ...t 0 CallTable NTUData NextScan EndProg B 2 Edlog Example The following example uses the voltage curve of the calibrations certificate provided in FIGURE 7 3 Since the coefficients of the voltage curve...

Page 46: ...Loc NTU_V_1 3 2 Avg Loc NTU_Volts NTU 0 29928 105 69 NTU_Volts 0 24763 NTU_Volts 2 evaluate to see if value 250 where High range measurement should be taken via Sub1 7 If X F P89 1 1 X Loc NTU 2 3 3...

Page 47: ...Appendix B Example Programs NTU 0 20709 401 11 NTU_Volts 35 310 NTU_Volts 2 6 End P95 End Program B 5...

Page 48: ...Appendix B Example Programs B 6...

Page 49: ...concerned with the wire colors for the 8425 cable as the MCBH wires are not accessible When a custom cable assembly is purchased from a third party vendor to connect the OBS sensor to a current meter...

Page 50: ...BS sensor bulkhead connectors MCBH 5 FS MCIL 5 MP Contact Number Electrical Function Wire Color MCBH Wire Color 8425 1 Power 5 15V Red Red 2 Power Ground Black Black 3 Signal Common Green Green 4 High...

Page 51: ...e Green FIGURE D 1 Wiring diagram for connecting an OBS sensor to an external relay and a datalogger 1 The assignment of channel number for example SE Channel 1 or C1 may vary depending on the applica...

Page 52: ...Appendix D Datalogger Connection to a Relay D 2...

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Page 54: ...m br Campbell Scientific Canada Corp CSC 14532 131 Avenue NW Edmonton AB T5L 4X4 CANADA www campbellsci ca dataloggers campbellsci ca Campbell Scientific Centro Caribe S A CSCC 300 N Cementerio Edific...

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