Campbell Scientific 227 227-L Delmhorst Cylindrical Soil Moisture Block
Campbell Scientific 227 Manual
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Campbell Scientific 227 manual content summary:
- Campbell Scientific 227 | 227-L Delmhorst Cylindrical Soil Moisture Block - Page 1
227 Delmhorst Cylindrical Soil Moisture Block Revision: 5/13 Copyright © 1983-2013 Campbell Scientific, Inc. - Campbell Scientific 227 | 227-L Delmhorst Cylindrical Soil Moisture Block - Page 2
- Campbell Scientific 227 | 227-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 227 | 227-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 227 | 227-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 227 | 227-L Delmhorst Cylindrical Soil Moisture Block - Page 6
Table of Contents ii - Campbell Scientific 227 | 227-L Delmhorst Cylindrical Soil Moisture Block - Page 7
on the model 227-L indicates that the cable length is user specified. This manual refers to the sensor as the 227. Before using the 227, 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 227 | 227-L Delmhorst Cylindrical Soil Moisture Block - Page 8
227 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 227 | 227-L Delmhorst Cylindrical Soil Moisture Block - Page 9
227 Delmhorst Cylindrical Soil Moisture Block 2. Select the Datalogger Model and enter the Scan Interval, and then select Next. 3. Select 227 Soil Moisture Block under Meteorological | Soil Moisture, and select the right arrow (in center of screen) to add it to the list of sensors to be measured. 3 - Campbell Scientific 227 | 227-L Delmhorst Cylindrical Soil Moisture Block - Page 10
227 Delmhorst Cylindrical Soil Moisture Block 4. Enter the Resistance units and the Soil Water Potential units. After entering the information, click on OK, and then select Next. 5. Choose the Outputs and then select Finish. 7. In the Save As window, enter an appropriate file name and select Save. - Campbell Scientific 227 | 227-L Delmhorst Cylindrical Soil Moisture Block - Page 11
it is not compatible with our CR200(X)-series. The -L option on the Model 227-L indicates that the cable length is user specified. This manual refers to the sensor as the 227. The cable can terminate in: • Pigtails that connect directly to a Campbell Scientific datalogger. • Connector that attaches - Campbell Scientific 227 | 227-L Delmhorst Cylindrical Soil Moisture Block - Page 12
227 Delmhorst Cylindrical Soil Moisture Block 6. Specifications Features: • Contains blocking capacitors in its cable that minimizes galvanic degradation and measurement errors due to ground loops • Measures a wide range of matric potential • Buffers salts in soil • No maintenance required • - Campbell Scientific 227 | 227-L Delmhorst Cylindrical Soil Moisture Block - Page 13
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 227 | 227-L Delmhorst Cylindrical Soil Moisture Block - Page 14
in Section 7.2.4, Programming Examples. 7.2.1 Excite and Measure the 227 The sensor is excited and measured using the BrHalf instruction in CRBasic or Edlog instruction AC Half Bridge (P5). Recommended excitation voltages and input ranges are given in TABLE 7-2. 7.2.2 Calculate Sensor Resistance - Campbell Scientific 227 | 227-L Delmhorst Cylindrical Soil Moisture Block - Page 15
227 Delmhorst Cylindrical Soil Moisture Block TABLE 7-2. Excitation and Voltage Ranges Datalogger CR800/CR850 CR1000 CR3000 CR5000 CR9000(X) 21X CR7 CR500/CR510 CR10(X) CR23X mV Excitation 250 250 200 200 200 500 500 250 250 200 Full Scale Range ±250 mV ±250 mV ±200 mV ±200 mV ±200 mV ±500 mV ± - Campbell Scientific 227 | 227-L Delmhorst Cylindrical Soil Moisture Block - Page 16
The nonlinear relationship of Rs to bars rules out averaging Rs directly. The polynomial is entered as an expression in CRBasic or by 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 227 | 227-L Delmhorst Cylindrical Soil Moisture Block - Page 17
Edlog, this multiplier can be entered in the Bridge Transform Instruction or in Processing Instruction 37. TABLE 7-5 shows errors between from the least-squares polynomial approximation and the typical water potential values. Our manuals used to show a separate polynomial for the 0.1 to 2 bar range - Campbell Scientific 227 | 227-L Delmhorst Cylindrical Soil Moisture Block - Page 18
program is written for a CR1000. Programming for other CRBasic dataloggers is similar. The 227 sensor is measured with the BrHalf() instruction. An expression uses the result of the BrHalf instruction (Vs / Vx) to generate Rs in kohms. If Rs is less than 17 kohms, soil water potential is generated - Campbell Scientific 227 | 227-L Delmhorst Cylindrical Soil Moisture Block - Page 19
. It is a CR10X program but other Edlog dataloggers are programmed similarly. The 227 sensor is measured with Measurement Instruction (5). The Bridge Transform Instruction (59) uses the result of Instruction 5 (Vs / Vx) to generate Rs in kohms. If Rs is less than 17 kohms, soil water potential is - Campbell Scientific 227 | 227-L Delmhorst Cylindrical Soil Moisture Block - Page 20
227 Delmhorst Cylindrical Soil Moisture Block TABLE 7-7. Wiring for CR10X Example Program Color Black Red White Clear Function Excitation Signal Signal Ground Shield CR10(X) E1 SE1 AG G *Table 1 Program 01: 10.0000 Execution Interval (seconds) 01: AC Half Bridge (P5) 1: 1 Reps 2: 14 250 mV - Campbell Scientific 227 | 227-L Delmhorst Cylindrical Soil Moisture Block - Page 21
227 Delmhorst Cylindrical Soil Moisture Block 07: Z=F (P30) 1: -99999 2: 0 3: 2 F Exponent of 10 Z Loc [ WatPoten ] 08: End (P95) ;End then do 09: If time is (P92) 1: 0 Minutes (Seconds --) into a 2: 360 Interval (same units as above) 3: 10 Set Output Flag High ;Output every six hours - Campbell Scientific 227 | 227-L Delmhorst Cylindrical Soil Moisture Block - Page 22
227 Delmhorst Cylindrical Soil Moisture Block 16 - Campbell Scientific 227 | 227-L Delmhorst Cylindrical Soil Moisture Block - Page 23
- Campbell Scientific 227 | 227-L Delmhorst Cylindrical Soil Moisture Block - Page 24
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
227 Delmhorst Cylindrical
Soil Moisture Block
Revision: 5/13
Copyright © 1983-2013
Campbell Scientific, Inc.