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Campbell Manufacturing DB1 manual

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Table of contents for the manual

  • Page 1

    DB1 Liquid Level Measurement Sensor Revision: 12/07 Copyright © 1993-2007 Campbell Scientific, Inc.[...]

  • Page 2

    Warranty and Assistance The DB1 LIQUID LEVEL MEASUREMENT SENSOR is warranted by CAMPBELL SCIENTIFIC, INC. to be free from defects in m aterials and workmanship under norm al use and service for twelve (12) m onths from date of shipment unl ess specified otherwise. Bat teries have no warranty. CAMPBELL SCIENTIFIC, INC.'s obligation under this w[...]

  • Page 3

    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. In[...]

  • Page 4

    This is a blank page.[...]

  • Page 5

    DB1 Liquid Level Measurement Sensor 1. Overview The double bubbler is a self-cali brating system for l iquid level m easurement. This manual focuses on water level measurement in stilling wells o r open channels, but the inform ation applies to other l iquids as well. The system detects water level by measuring the pressure required t o force a nit[...]

  • Page 6

    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 45 psi Option - 15 60 psi Transducer Accuracy: ± 0.05 % Full Scale Temperature Range: -25 ° to + 50 [...]

  • Page 7

    DB1 Liquid Level Measurement Sensor fluctuates between 5 and 15 ft (2.2 a nd 6.5 psi ), set the pressure regulator above 7 psi (read 10 psi) to ensure adequate pressure. Open the nitrogen bottle valve, set the p ressure regulator, an d adjust the nitrogen flow by adjusting t he two needle valves. The suggested bubble rate is 1 to 3 bubbles/seconds.[...]

  • 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, CR 800 CR850, 21X FIGURE 3. Wiring Diagram for DB1 5[...]

  • Page 10

    DB1 Liquid Level Measurement Sensor 5. Programming Every 60 seconds, the following program examples calcul ate the pressure transducer multiplier, measure the offset, and measure the liquid level. The average liquid level i s stored in final m emory every 15 m inutes. 5.1 CR1000 Example 'CRBasic code for CR1000, CR800, or C R850 Public WtrLvl [...]

  • Page 11

    DB1 Liquid Level Measurement Sensor C a s e 3 P o r t S e t ( 3 , 1 ) 'Open valve to atmosphere EndSelect Delay(0,150,MSEC) S u m = 0 For j = 1 To 25 'Take 25 pressure readings for each tube and atmosphere BrFull(m V, 1, mV25,4, VX1, 1, 2500, true, true, 0, _60Hz, 1, 0) Su m = Su m + mV N e x t j Valve(i)= Sum/25 'Average the 25 read[...]

  • 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 (unit s=.01sec) 4: 0 mV Excit ation Subroutine 1 measures the pressure in the tubing connected t o the second value: 4: Do (P86) 1: 1 Call Subrouti ne 1 5: Do (P86) 1: 52 Set low Port 2 The following instruct ions co[...]

  • Page 13

    DB1 Liquid Level Measurement Sensor 2: Z=F (P30) 1: 0 F 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 Rep 2: 23 25 mV 60 Hz reject ion Range 3: 1 IN Chan 4: 1 Excite all reps w/EXchan 1 5: 2500 mV Excitation 6: 6 Loc [:mV/V ] 7: 1 Mult 8: 0 Offset 5: Z=X+Y (P33) 1: 7 X Loc SUM[...]

  • Page 14

    DB1 Liquid Level Measurement Sensor 13: Do (P86) 1: 1 Call Subrouti ne 1 14: Z=X (P31) 1: 8 X Loc AVG LEVEL 2: 9-- Z Loc [:m V/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 2: 9 Y Loc mV/V #1 3: 12 Z Loc [:DELTA V ] Note: On the next command, enter the measured Del ta h value for F, using the units (e[...]

  • Page 15

    DB1 Liquid Level Measurement Sensor 6.1 Periodic Maintenance • Inspect submerged bubbler t ubes for sediment or ot her debris. Remove debris and clean tubes as required. • Replace submerged bubbler tubes if cracked or dama ged. • Replace nitrogen bottle every 2 to 3 months dependi ng on bubble rate. • Inspect valves for leaks every 2 to 3 m[...]

  • Page 16

    DB1 Liquid Level Measurement Sensor 12 7. Replacement Parts Part # Description Qty. in DB1 5199 SWAK 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[...]

  • Page 17

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  • Page 18

    Campbell Scientific Companies Campbell Scientific, Inc. (CSI) 815 West 1800 Nort h Logan, Utah 84 321 UNITED STATES www.campbellsci.com info@campbellsci.com Campbell Scientific Afri ca Pty. Lt d. (CSAf) PO Box 2450 Somerset West 7129 SOUTH AFRICA www.csafrica.co.za cleroux@csafrica.co.za Campbell Scientific Aust ralia Pty. Ltd. (CSA) PO Box 444 Thu[...]