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Interfacing the OBS-3 Turbidity Monitor with Campbell Scientific Dataloggers 

5 

2.4  CRBasic Program Example 

'CR1000 

 

'Declare Variables and Units 

Public Batt_Volt 
Public FTU 
 
Units Batt_Volt=Volts 
 

'Define Data Tables 

DataTable(Table1,True,-1) 
 DataInterval(0,60,Min,10) 
 Average(1,FTU,IEEE4,False) 
 Maximum(1,FTU,IEEE4,False,True) 
EndTable 
 
DataTable(Table2,True,-1) 
 DataInterval(0,1440,Min,10) 
 Minimum(1,Batt_Volt,FP2,False,False) 
EndTable 
 

'Main Program 

BeginProg 
 Scan(30,Min,1,0) 

 

 

'Default Datalogger Battery Voltage measurement Batt_Volt: 

  Battery(Batt_Volt) 

 

 

'OBS-3 Turbidity Probe (D&A Instruments) measurement FTU: 

  PortSet(9,1) 
  Delay(0,3,Sec) 
  VoltDiff(FTU,1,mV5000,1,True,0,_60Hz,0.4,0) 

'MULTIPLIER: (2000 FTU)/(5000 mV) = 0.4

 

  PortSet(9,0) 

 

 

'Call Data Tables and Store Data 

  CallTable(Table1) 
  CallTable(Table2) 
 NextScan 
EndProg 

 

3.  Maintenance and Troubleshooting 

Follow the maintenance and troubleshooting procedures that are outlined in the 
OBS-3 technical manual provided by D & A Instrument Company. 

 

Summary of Contents for OBS-3

Page 1: ...INSTRUCTION MANUAL Interfacing the OBS 3 Turbidity Monitor with Campbell Scientific Dataloggers 10 05 C o p y r i g h t c 1 9 9 8 2 0 0 5 C a m p b e l l S c i e n t i f i c I n c ...

Page 2: ...is manual should be used in conjunction with the original manufacturer s technical reference documentation See their documentation for information concerning product use and safety If you encounter out of date incomplete or incorrect information please contact us so we can attempt to remedy the situation Because the product is manufactured by another company their warranty applies Contact the orig...

Page 3: ...ions 1 2 Programming 3 2 1 Using Short Cut 3 2 2 Using Edlog or the Keyboard Display 3 2 3 Edlog Program Example 3 2 4 CRBasic Program Example 5 3 Maintenance and Troubleshooting 5 Figures 1 Wiring Diagram of OBS 3 Using Datalogger s Switched 12 V 1 2 Wiring Diagram of OBS 3 without Using Switched 12 V 2 3 Wiring Diagram for Connecting an OBS 3 to an External Relay and a Datalogger 2 ...

Page 4: ...This is a blank page ...

Page 5: ...h the optional 0 to 2500 mV output range When turbidity is very high the OBS 3 probe can generate an output greater than 5 V To avoid the loss of data ask D A Instruments to install a voltage limiting circuit in the probe that clamps the output to 2 5 V or 5 0 V The OBS 3 probe may draw over 30 mA Because this power requirement is relatively high we recommend you provide switched power such as the...

Page 6: ...alogger FIGURE 3 Wiring Diagram for Connecting an OBS 3 to an External Relay and a Datalogger 1 The assignment of channel number e g Diff Channel 1 or C1 may vary depending on the application 2 You may use a relay such as Campbell Scientific part 7321 instead of the switched 12 V connection on the CR10 X CR1000 and CR23X wiring panel Since the CR510 wiring panels do not have switched 12 V you will...

Page 7: ... the probe s millivolt signal This instruction requires a multiplier to be calculated The multiplier is the full scale FTU value divided by the probe s full scale millivolt output Typically the offset is zero 2 3 Edlog Program Example The program on the following page reads an OBS 3 probe that s using switched 12 V power either built in or using an external relay The program could be used for a CR...

Page 8: ...et Remove power from probe 4 Do P86 1 51 Set Port 1 Low Measure system voltage 5 Batt Voltage P10 1 2 Loc BATT_VOLT Output every hour the date and the average turbidity maximum turbidity with the time of occurrence and battery voltage 6 If time is P92 1 0 Minutes into a 2 60 Interval 3 10 Set Output Flag High 7 Real Time P77 1 1110 Year Day Hour Minute 8 Average P71 1 1 Reps 2 1 Loc Turbidity 9 Ma...

Page 9: ...Minimum 1 Batt_Volt FP2 False False EndTable Main Program BeginProg Scan 30 Min 1 0 Default Datalogger Battery Voltage measurement Batt_Volt Battery Batt_Volt OBS 3 Turbidity Probe D A Instruments measurement FTU PortSet 9 1 Delay 0 3 Sec VoltDiff FTU 1 mV5000 1 True 0 _60Hz 0 4 0 MULTIPLIER 2000 FTU 5000mV 0 4 PortSet 9 0 Call Data Tables and Store Data CallTable Table1 CallTable Table2 NextScan ...

Page 10: ...Interfacing the OBS 3 Turbidity Monitor with Campbell Scientific Dataloggers 6 This is a blank page ...

Page 11: ...This is a blank page ...

Page 12: ... campbellsci com br suporte campbellsci com br Campbell Scientific Canada Corp CSC 11564 149th Street NW Edmonton Alberta T5M 1W7 CANADA www campbellsci ca dataloggers campbellsci ca Campbell Scientific Ltd CSL Campbell Park 80 Hathern Road Shepshed Loughborough LE12 9GX UNITED KINGDOM www campbellsci co uk sales campbellsci co uk Campbell Scientific Ltd France Miniparc du Verger Bat H 1 rue de Te...

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