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Summary of Contents for Campbell DB1
- 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 Warranty and Assistance The DB1 LIQUID LEVEL MEASUREMENT SENSOR is warranted by CAMPBELL SCIENTIFIC, INC. to be free from defects in materials and workmanship under normal use and service for twelve (12) months from date of shipment unless specified otherwise. Batteries have no warranty. CAMPBELL SCIENTIFIC, INC.'s obligation under this warranty is limited to repairing or replacing (at CAMPBELL SCIENTIFIC, INC.'s option) defective products.
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Page 3: Table Of Contents
DB1 Table of Contents PDF viewers note: These page numbers refer to the printed version of this document. Use the Adobe Acrobat® bookmarks tab for links 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. - Page 4 This is a blank page.
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Page 5: Overview
DB1 Liquid Level Measurement Sensor 1. Overview The double bubbler is a self-calibrating system for liquid level measurement. This manual focuses on water level measurement in stilling wells or open channels, but the information applies to other liquids as well. The system detects water level by measuring the pressure required to force a nitrogen gas bubble from a submerged tube. -
Page 6: Specifications
DB1 Liquid Level Measurement Sensor 2. Specifications Measurement Range: Option - 5 (0 to 5 psi/0 to 11.5 ft.) Option - 15 (0 to 15 psi/0 to 34.5 ft.) Option - 30 (0 to 30 psi/0 to 69 ft.) Maximum Overpressure Range: Option - 5 20 psi Option - 10... -
Page 7: Wiring
DB1 Liquid Level Measurement Sensor fluctuates between 5 and 15 ft (2.2 and 6.5 psi), set the pressure regulator above 7 psi (read 10 psi) to ensure adequate pressure. Open the nitrogen bottle valve, set the pressure regulator, and adjust the nitrogen flow by adjusting the two needle valves. - Page 8 DB1 Liquid Level Measurement Sensor FIGURES 1 and 2. The DB1 System...
- Page 9 DB1 Liquid Level Measurement Sensor CR10(X) CR1000, CR800 CR850, 21X FIGURE 3. Wiring Diagram for DB1...
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Page 10: Programming
DB1 Liquid Level Measurement Sensor 5. Programming Every 60 seconds, the following program examples calculate the pressure transducer multiplier, measure the offset, and measure the liquid level. The average liquid level is stored in final memory every 15 minutes. 5.1 CR1000 Example 'CRBasic code for CR1000, CR800, or CR850 Public WtrLvl Public Batt_Volt... -
Page 11: Cr10(X) Example
DB1 Liquid Level Measurement Sensor Case 3 PortSet(3,1) 'Open valve to atmosphere EndSelect Delay(0,150,MSEC) Sum = 0 For j = 1 To 25 'Take 25 pressure readings for each tube and atmosphere BrFull(mV, 1, mV25,4, VX1, 1, 2500, true, true, 0, _60Hz, 1, 0) Sum = Sum + mV Next j Valve(i)= Sum/25... - Page 12 DB1 Liquid Level Measurement Sensor 3: Excitation with Delay (P22) 1: 1 EX Chan 2: 0 Delay w/EX (units=.01sec) 3: 150 Delay after EX (units=.01sec) 4: 0 mV Excitation Subroutine 1 measures the pressure in the tubing connected to the second value: 4: Do (P86) 1: 1 Call Subroutine 1...
- Page 13 DB1 Liquid Level Measurement Sensor 2: Z=F (P30) 1: 0 2: 0 Exponent of 10 3: 7 Z Loc [:SUM 3: Beginning of Loop (P87) 1: 0 Delay 2: 25 Loop Count 4: Full Bridge (P6) 1: 1 2: 23 25 mV 60 Hz rejection Range 3: 1 IN Chan...
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Page 14: Maintenance
DB1 Liquid Level Measurement Sensor 13: Do (P86) 1: 1 Call Subroutine 1 14: Z=X (P31) 1: 8 X Loc AVG LEVEL 2: 9-- Z Loc [:mV/V #1 ] 15: Do (P86) 1: 51-- Set low Port 1 16: End (P95) 17: Z=X-Y (P35) 1: 10 X Loc mV/V #2... -
Page 15: Periodic Maintenance
DB1 Liquid Level Measurement Sensor 6.1 Periodic Maintenance • Inspect submerged bubbler tubes for sediment or other debris. Remove debris and clean tubes as required. • Replace submerged bubbler tubes if cracked or damaged. • Replace nitrogen bottle every 2 to 3 months depending on bubble rate. •... -
Page 16: Replacement Parts
DB1 Liquid Level Measurement Sensor 7. Replacement Parts Part # Description Qty. in DB1 5199 SWAK THREAD SEALANT 7397 TUBE FITTING ELL 1/4 O.D.x 1/8NPT 7558 NEEDLE VALVE ASSEMBLY 7561 2-WAY NC SOLENOID VALVE 7571 PLUG PIPE 1/8NPT TEFCOAT 6078 MOUNTING SCREW (6/32 x 2.00in) 7596 DB1 MANIFOLD BLOCK... - Page 17 This is a blank page.
- Page 18 Campbell Scientific Companies Campbell Scientific, Inc. (CSI) 815 West 1800 North Logan, Utah 84321 UNITED STATES www.campbellsci.com info@campbellsci.com Campbell Scientific Africa Pty. Ltd. (CSAf) PO Box 2450 Somerset West 7129 SOUTH AFRICA www.csafrica.co.za cleroux@csafrica.co.za Campbell Scientific Australia Pty. Ltd. (CSA) PO Box 444 Thuringowa Central QLD 4812 AUSTRALIA...