Campbell Scientific 223 223-L Delmhorst Cylindrical Soil Moisture Block
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- Campbell Scientific 223 | 223-L Delmhorst Cylindrical Soil Moisture Block - Page 1
223 Delmhorst Cylindrical Soil Moisture Block Revision: 5/13 Copyright © 1991-2013 Campbell Scientific, Inc. - Campbell Scientific 223 | 223-L Delmhorst Cylindrical Soil Moisture Block - Page 2
- Campbell Scientific 223 | 223-L Delmhorst Cylindrical Soil Moisture Block - Page 3
") to be free from defects in materials and workmanship under normal use and service for twelve (12) months from date of shipment unless otherwise specified in the corresponding Campbell pricelist or product manual. Products not manufactured, but that are re-sold by Campbell, are warranted only - Campbell Scientific 223 | 223-L Delmhorst Cylindrical Soil Moisture Block - Page 4
435) 227-9000. After an applications engineer determines the nature of the problem, an RMA number will be issued. Please write this number clearly on 's expense. Campbell Scientific reserves the right to refuse service on products that were exposed to contaminants that may cause health or safety - Campbell Scientific 223 | 223-L Delmhorst Cylindrical Soil Moisture Block - Page 5
Table of Contents PDF viewers: These page numbers refer to the printed version of this document. Use the PDF reader bookmarks tab for links to specific sections. 1. Introduction 1 2. Cautionary Statements 1 3. Initial Inspection 1 4. Quickstart 2 4.1 Installation 2 4.2 Use SCWin to Program - Campbell Scientific 223 | 223-L Delmhorst Cylindrical Soil Moisture Block - Page 6
Table of Contents 7-4. Polynomial Coefficients for Converting Sensor Resistance to Bars.. 13 7-5. Polynomial Error - 10 Bar Range 13 ii - Campbell Scientific 223 | 223-L Delmhorst Cylindrical Soil Moisture Block - Page 7
the model 223-L indicates that the cable length is user specified. This manual refers to the sensor as the 223. Before using the 223, please The black outer jacket of the cable is Santoprene® rubber. This jacket will support combustion in air. It is rated as slow burning when tested according to - Campbell Scientific 223 | 223-L Delmhorst Cylindrical Soil Moisture Block - Page 8
223 Delmhorst Cylindrical Soil Moisture Block 4. Quickstart Please review Section 7, Operation, for wiring, CRBasic programming, and Edlog programming. 4.1 Installation 1. Soak blocks in water for one hour then allow them to dry. 2. Repeat Step 1. 3. Make sensor access holes to the depth required. - Campbell Scientific 223 | 223-L Delmhorst Cylindrical Soil Moisture Block - Page 9
223 Delmhorst Cylindrical Soil Moisture Block NOTE 2. Select the Datalogger Model and enter the Scan Interval, and then select Next. A scan rate of 30 seconds or longer is recommended when using a multiplexer. 3. Under Devices, select AM16/32, and select the right arrow (in center of screen) to - Campbell Scientific 223 | 223-L Delmhorst Cylindrical Soil Moisture Block - Page 10
223 Delmhorst Cylindrical Soil Moisture Block 4. Select 223 Soil Moisture Sensor, and select the right arrow (in center of screen) to add it to the list of sensors to be measured. The Properties window will appear after the right arrow is selected. 5. In the Properties window, enter the number of - Campbell Scientific 223 | 223-L Delmhorst Cylindrical Soil Moisture Block - Page 11
223 Delmhorst Cylindrical Soil Moisture Block 6. Choose the Outputs and then select Finish. 7. In the Save As window, enter an appropriate file name and select Save. 8. In the Confirm window, click Yes to download the program to the datalogger. 9. Click on Wiring Diagram and select the CR1000 tab. - Campbell Scientific 223 | 223-L Delmhorst Cylindrical Soil Moisture Block - Page 12
moisture block is configured for use with multiplexers. The -L option on the model 223-L indicates that the cable length is user specified. This manual refers to the sensor as the 223. The Delmhorst cylindrical block is composed of gypsum cast around two concentric electrodes which confine current - Campbell Scientific 223 | 223-L Delmhorst Cylindrical Soil Moisture Block - Page 13
223 Delmhorst Cylindrical Soil Moisture Block 6. Specifications Features: • Compatible with multiplexers allowing measurement of multiple sensors • Multiplexer connection prevents electrolysis from prematurely destroying the soil moisture block • Measures a wide range of matric potential • - Campbell Scientific 223 | 223-L Delmhorst Cylindrical Soil Moisture Block - Page 14
cable is Santoprene® rubber. This compound was chosen for its resistance to temperature extremes, moisture, and UV degradation. However, this jacket will support combustion in air. It is rated as slow burning when tested according to U.L. 94 H.B. and will pass FMVSS302. Local fire codes may preclude - Campbell Scientific 223 | 223-L Delmhorst Cylindrical Soil Moisture Block - Page 15
7.2.1.2, Edlog. For more information, see the multiplexer manual. 7.2.1.1 CRBasic The generalized CRBasic programming sequence follows: port 2 low INCREMENT INDEX AND MEASURE I=I+1 '223 measurement instruction 'Storing results in Variable(I) END MEASUREMENT LOOP NextSubScan DEACTIVATE - Campbell Scientific 223 | 223-L Delmhorst Cylindrical Soil Moisture Block - Page 16
Set Port(s) (P20) to set the port low. 7.2.2 Excite and Measure the 223 The sensor is excited and measured using the BrHalf instruction in CRBasic or Instruction 5 (AC Half Bridge) in Edlog. Recommended excitation voltages and input ranges are given in TABLE 7-2. TABLE 7-2 shows the excitation and - Campbell Scientific 223 | 223-L Delmhorst Cylindrical Soil Moisture Block - Page 17
Resistor. 7.2.3 Calculate Sensor Resistance The sensor resistance is calculated using an expression in CRBasic or Edlog instruction BR Transform Rf[X/(1-X)] (P59). The expression or Edlog instruction BR Transform Rf[X/(1-X)] (P59) takes the Half Bridge output (Vs/Vx) and computes sensor resistance - Campbell Scientific 223 | 223-L Delmhorst Cylindrical Soil Moisture Block - Page 18
nonlinear relationship of Rs to bars rules out averaging Rs directly. The polynomial is entered as an expression in CRBasic or by using Edlog instruction Polynomial (P55). The polynomial to calculate soil water potential is fit to the 0.1 to 10 bar range using a least square fit. TABLE 7-4 lists the - Campbell Scientific 223 | 223-L Delmhorst Cylindrical Soil Moisture Block - Page 19
223 Delmhorst Cylindrical Soil Moisture Block Typical Values from TABLE 7-3 Block Resistance (kohms) FIGURE 7-2. Polynomial fit to typical block resistance vs. water potential TABLE 7-4. Polynomial Coefficients for Converting Sensor Resistance to Bars BARS = C0 + C1(Rs) + C2(Rs)2 + C3(Rs)3 + C4( - Campbell Scientific 223 | 223-L Delmhorst Cylindrical Soil Moisture Block - Page 20
223 Delmhorst Cylindrical Soil Moisture Block 7.2.5 Example Programs 7.2.5.1 Example CR1000 Program Below is a CR1000 program that measures five 223 sensors, calculates resistance, and calculates soil water potential. FIGURE 7-3. Wiring for CR1000 example 'CR1000 'Declare Variables and Units Dim - Campbell Scientific 223 | 223-L Delmhorst Cylindrical Soil Moisture Block - Page 21
223 Delmhorst Cylindrical Soil Moisture Block 'Define Data Tables DataTable(Table1,True,-1) DataInterval(0,60,Min,10) Sample(1,kohms(1),FP2) Sample(1,WP_kPa(1),FP2) Sample(1,kohms(2),FP2) Sample(1,WP_kPa(2),FP2) Sample(1,kohms(3),FP2) Sample(1,WP_kPa(3),FP2) Sample(1,kohms(4),FP2) Sample(1,WP_kPa - Campbell Scientific 223 | 223-L Delmhorst Cylindrical Soil Moisture Block - Page 22
223 Delmhorst Cylindrical Soil Moisture Block 7.2.5.2 Example CR10(X) Program CR10(X) Multiplexer FIGURE 7-4. Wiring for CR10(X) example *Table 1 Program 01: 60.0000 Execution Interval (seconds) 01: Do (P86) 1: 41 Set Port 1 High ;Enable multiplexer 02: Beginning of Loop (P87) 1: 0 - Campbell Scientific 223 | 223-L Delmhorst Cylindrical Soil Moisture Block - Page 23
223 Delmhorst Cylindrical Soil Moisture Block 08: Do (P86) 1: 51 Set Port 1 Low ;Turn off multiplexer ;The following loop checks each block resistance and calculates ;water potential if BlockR < 17 kohms. Because 2 blocks are measured ;with each pass through the previous measurement loop, it - Campbell Scientific 223 | 223-L Delmhorst Cylindrical Soil Moisture Block - Page 24
223 Delmhorst Cylindrical Soil Moisture Block 19: Real Time (P77) 1: 220 20: Sample (P70) 1: 64 2: 1 ;Output Day and Hour/Minute Day,Hour/Minute (midnight = 2400) Reps Loc [ BlockR_1 ] ;Output resistances and Water Potentials 7.2.5.3 Example 21X Program 21X Multiplexer FIGURE 7-5. - Campbell Scientific 223 | 223-L Delmhorst Cylindrical Soil Moisture Block - Page 25
223 Delmhorst Cylindrical Soil Moisture Block 05: AC Half Bridge (P5) ;Measure the 2 connected 223 blocks 1: 2 Reps 2: 14 500 mV Fast Range 3: 1 SE Channel 4: 2 Excite all reps w/Exchan 2 5: 500 mV Excitation 6: 1-- Loc [ BlockR_1 ] ; -- >>> advance location by index 7: 1.0 - Campbell Scientific 223 | 223-L Delmhorst Cylindrical Soil Moisture Block - Page 26
223 Delmhorst Cylindrical Soil Moisture Block 14: Z=F (P30) 1: -99999 2: 33-- F Z Loc [ WatPo_1 ] 15: End (P95) ;End then do 16: End (P95) ;End loop 17: If time is (P92) 1: 0 2: 60 3: 10 ;Output Resistance and Water Potential each Hour Minutes (Seconds --) into a Interval (same - Campbell Scientific 223 | 223-L Delmhorst Cylindrical Soil Moisture Block - Page 27
- Campbell Scientific 223 | 223-L Delmhorst Cylindrical Soil Moisture Block - Page 28
Campbell Scientific Companies Campbell Scientific, Inc. (CSI) 815 West 1800 North Logan, Utah 84321 UNITED STATES www.campbellsci.com • [email protected] Campbell Scientific Africa Pty. Ltd. (CSAf) PO Box 2450 Somerset West 7129 SOUTH AFRICA www.csafrica.co.za • [email protected] Campbell
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223 Delmhorst Cylindrical
Soil Moisture Block
Revision: 5/13
Copyright © 1991-2013
Campbell Scientific, Inc.