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Page 1: ...DB1 Liquid Level Measurement Sensor Revision 12 07 C o p y r i g h t 1 9 9 3 2 0 0 7 C a m p b e l l S c i e n t i f i c I n c ...
Page 2: ... all other warranties expressed or implied including warranties of merchantability or fitness for a particular purpose CAMPBELL SCIENTIFIC INC is not liable for special indirect incidental or consequential damages Products may not be returned without prior authorization The following contact information is for US and International customers residing in countries served by Campbell Scientific Inc d...
Page 3: ...s to specific sections 1 Overview 1 2 Specifications 2 3 Installation 2 4 Wiring 3 5 Programming 6 5 1 CR1000 Example 6 5 2 CR10 X Example 7 6 Maintenance 10 6 1 Periodic Maintenance 11 6 2 Solenoid Valve 11 6 3 Fittings 11 6 4 Needle Valve 11 7 Replacement Parts 12 Figures 1 and 2 The DB1 System 4 3 Wiring Diagram for DB1 5 This is a blank page i ...
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Page 5: ...single pressure transducer is used to measure three pressure lines h1 h2 or offset The line to be measured is controlled by the three 2 way solenoid valves on the manifold The bubble rate is controlled by the two needle valves on the manifold assembly labeled 1 and 2 The needle valve labeled 1 controls the bubble rate for the pressure line used to measure h1 The needle valve labeled 2 controls the...
Page 6: ...the elbow fitting below the valve marked 2 Insert the offset line into the elbow fitting to the right of the valve marked 2 Insert the nitrogen supply line into the elbow fitting on the right side of the manifold assembly Permanently install h1 and h2 a fixed vertical distance apart in the water see Figure 2 delta h Maximize the fixed distance between h1 and h2 while keeping h1 at least six inches...
Page 7: ...use the SW12V port on the datalogger to open the valve just prior to a measurement This will result in slower consumption of nitrogen but may result in biomass build up in the mouth of the tubes 4 Wiring Wiring connections for the CR800 CR850 CR1000 and CR10 X dataloggers are shown in Figure 3 The channel numbering in the wiring diagram matches the channel usage in the program examples The pressur...
Page 8: ...DB1 Liquid Level Measurement Sensor FIGURES 1 and 2 The DB1 System 4 ...
Page 9: ...DB1 Liquid Level Measurement Sensor CR10 X CR1000 CR800 CR850 21X FIGURE 3 Wiring Diagram for DB1 5 ...
Page 10: ...im Mult Dim Offset Dim Valve 3 Dim Delta_mV Const Delta_H Set Delta_H equal to the vertical difference between the upper tube and lower tube Unit of measurement of Delta_H will determine unit of measurement of final output OUTPUT SECTION DataTable Table1 true 1 DataInterval 0 5 Min 10 Sample 1 WtrLvl FP2 EndTable DataTable Table2 true 1 DataInterval 0 1440 min 10 Minimum 1 Batt_Volt FP2 False True...
Page 11: ...e to lower tube PortSet 2 0 Close Valve to upper tube PortSet 3 0 Close Valve to atmosphere Next i Delta_mV Valve 2 Valve 1 Mult Delta_H Delta_mV Offset Valve 3 Mult WtrLvl Valve 2 Mult Offset units of WtrLvl are same units as Delta_H a constant CallTable Table1 NextScan EndProg 5 2 CR10 X Example Input Location Usage LOCATION LABEL 1 Liquid Level 4 Multiplier 5 Offset 6 mv V 7 Sum 8 Avg Level 9 m...
Page 12: ... The following instructions convert the mV readings to engineering units 6 Z X Y P36 1 8 X Loc AVG LEVEL 2 4 Y Loc MULT 3 1 Z Loc LEVEL 1 7 Z X Y P33 1 1 X Loc LEVEL 1 2 5 Y Loc OFFSET 3 1 Z Loc LEVEL 1 8 If time is P92 1 0 minutes into a 2 15 minute interval 3 10 Set high Flag 0 output 9 Real Time P77 1 110 Day Hour Minute 10 Average P71 1 1 Rep 2 1 Loc LEVEL 1 11 End Table 1 Table 3 Subroutines ...
Page 13: ...Loc SUM 6 End P95 7 Z X F P37 1 7 X Loc SUM 2 04 F 3 8 Z Loc AVG LEVEL 08 End P95 Subroutine 2 activates values 1 3 measures h1 h2 and atmospheric pressure and calculates the multiplier and offset 09 Beginning of Subroutine P85 1 2 Subroutine Number 10 Beginning of Loop P87 1 0 Delay 2 3 Loop Count 11 Do P86 1 41 Set high Port 1 Note The dashes after 41 indicate at the next loop port 2 will be set...
Page 14: ...cm etc you want the data to be in on your printout 18 Z F P30 1 0 F 2 0 Exponent of 10 3 13 Z Loc DELTA H 19 Z X Y P38 1 13 X Loc DELTA H 2 12 Y Loc DELTA V 3 4 Z Loc MULT 20 Z X Y P36 1 11 X Loc mV V 3 2 4 Y Loc MULT 3 5 Z Loc OFFSET 21 Z X F P37 1 5 X Loc OFFSET 2 1 F 3 5 Z Loc OFFSET 22 End P95 23 End Table 3 6 Maintenance The user should review the Installation and Maintenance section in the a...
Page 15: ...the top half of the valve assembly There are two parts inside the valve a very thin washer and a spring plate Be aware the washer may stick to the top half of the valve during disassembly Clean any contamination from the valve or spring plate Inspect the rubber seal on the spring plate for cracks or damage replace valve if seal is damaged Reassemble by placing the spring plate in the base rubber s...
Page 16: ...WAK THREAD SEALANT 1 7397 TUBE FITTING ELL 1 4 O D x 1 8NPT 4 7558 NEEDLE VALVE ASSEMBLY 2 7561 2 WAY NC SOLENOID VALVE 3 7571 PLUG PIPE 1 8NPT TEFCOAT 2 6078 MOUNTING SCREW 6 32 x 2 00in 4 7596 DB1 MANIFOLD BLOCK 1 7680 TUBE CUTTER 1 7667 RELAY CABLE ASSEMBLY 3 7567 PRESSURE LINE YELLOW PER FT ...
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