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Campbell EasyAG SDI-12, Инструкция по эксплуатации

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C-1 

Appendix C.  Site Selection 

Site selection is a critical process for all soil water sensors.  A properly selected 
site will reflect changes in soil moisture and plant water use trends over a 
larger area.  This area may be an entire field, sub-section of a field, a crop 

variety, a planting, a soil type, etc.  Putting a sensor in a ‘dry zone’ or under the 

influence of a malfunctioning sprinkler will invalidate data to some degree. 

Site selection is carried out by identifying macro-zones and micro-zones. 

Macro-zone selection divides the property in zones according to soil type, soil 
depth, water holding capacity, and water tables and salinity.  Irrigation 
applications can be specifically tailored to these zones to match soil and crop 
variability as a macro zone consists of areas with similar crop water use.   

Micro-zone selection determines the position of access tubes in relation to the 
crop and irrigation system and considers the areas of the root zone, canopy 
spread, water distribution uniformity, and moisture pattern of drip irrigation.  
Measurements are taken from a small part of the root-zone.  If the extent and 
depth of the root-zone is misjudged and/or when sensors are placed in dry or 
wet spots associated with a bad distribution uniformity of water, the soil water 
data will not indicate optimal irrigation scheduling. 

Important factors to take into consideration for site selection are: 

1.

 

Soil spatial variability 

2.

 

Topography 

3.

 

Aspect of sloping land 

4.

 

Crop type 

5.

 

Crop age 

6.

 

Crop planting density 

7.

 

Size and extent of the effective root system of the crop 

8.

 

Irrigation system layout and flexibility 

9.

 

Water Distribution uniformity 

10.

 

Moisture patterns under drip irrigation. 

 

 

 

Содержание EasyAG SDI-12

Страница 1: ...INSTRUCTION MANUAL EasyAG Profile Probes February 2015 C o p y r i g h t 2 0 0 2 2 0 0 9 C a m p b e l l S c i e n t i f i c I n c EasyAG and EnviroSMART are trademarks of Sentek Pty Ltd ...

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Страница 4: ...ner Campbell Scientific s shipping address is CAMPBELL SCIENTIFIC CANADA CORP RMA _____ 14532 131 Avenue NW Edmonton Alberta T5L 4X4 Canada For all returns the client must fill out a Statement of Product Cleanliness and Decontamination form and comply with the requirements specified in it The form is available from our web site at www campbellsci ca repair A completed form must be either emailed t...

Страница 5: ... Volumetric Water Content 2 5 2 Salinity 2 6 Specifications 4 7 Installation 5 8 Probe Wiring 5 8 1 DI 12 Interface Wiring 5 8 2 Cable Installation 6 9 Datalogger Programming 6 10 Care and Maintenance 14 11 Acknowledgements 14 Appendices A Normalization and Function Test A 1 A 1 Normalization A 1 A 1 1 Water Content Only A 2 A 1 2 TriSCAN Normalization A 4 A 2 Configuration Testing A 5 B Tube Inst...

Страница 6: ...g Access Tubes B 12 C Site Selection C 1 D SDI 12 Commands D 1 Figures 8 1 EasyAG SDI 12 Interface 5 A 1 SDI 12 Interface Power Connection A 1 A 2 SDI 12 Interface TTL Connection A 1 A 3 IPConfig Utility Icon A 2 A 4 IPConfig Probe Configuration Window A 2 A 5 IPConfig Probe Configuration Window for TriSCAN A 4 A 6 IPConfig Configuration Test Window A 5 ...

Страница 7: ...ve Data Relative data are produced by an EasyAG calibrated for a range of soil types and this calibration is used as a default calibration on all soil types Readings cannot be considered as absolute data but instead reflect soil water and ion changes used as decision criteria in soil management Relative water content data have been used since at least 1992 for irrigation management isolating facto...

Страница 8: ...ture Consecutive readings in equilibrated soil have a coefficient of variation of 0 1 Accuracy of the system is dependent upon the similarity of the soil site to that of the original default soil type used by Sentek Calibration coefficients based on this default soil type are used in normal operation If site specific quantitative values are required then a calibration procedure is required to be p...

Страница 9: ...efer to the benchmarking section of the Sentek TriSCAN manual Precise temperature effects on salinity data output are currently unknown It is however known that there is a minor positive relationship between VIC and soil temperature The salinity model currently does not include temperature correction ...

Страница 10: ...6 Bit pulse count Output Resolution 16 Bit Output Method Serial data Current Consumption 250 μA Sleep 66 mA Standby 100 mA Sampling Reading range Water Content Salinity 0 to 65 0 to 17 dSm 1 Temperature effects r3 5 C to 35 C Operating temperature range 20 C to 75 C Time to read one sensor 1 1 seconds Sphere of influence 99 of the reading is taken within a 10 cm radius from the outside of the acce...

Страница 11: ...ows for use of data in Sentek s Irrimax Software which allows for application of new soil calibrations after data are collected Option 1 is used for the purposes of this manual Refer to the installation manual published for each probe for information on access tube installation Appendix A addresses probe normalization 8 Probe Wiring A very small flat point screw driver is used to open the gates of...

Страница 12: ... measures scaled frequencies calculates water contents and stores scaled frequencies water contents and volumetric ion contents separately Scaled frequencies are stored with an array identifier leading 8 data values per record followed by 8 VIC per record with the record ending with zero rain and irrigation values for compatibility with DBLOAD Irrimax software Assumptions EnviroSMART or EasyAG pro...

Страница 13: ...ginProg Set Probe ID ES1_ID 101 Set Scan Interval Scan 30 Sec 3 0 Preload Inactive Sensor Error covers all missing sensors For X 1 to 8 step 1 ES1_SF X 1000 ES1_VIC X 1000 Next X Measure Water Content Scaled Frequencies SF with 5 retries See Appendix D for other SDI 12 commands For X 1 to 5 step 1 SDI12Recorder ES1_SF 7 0 M 1 0 0 If ES1_SF 1 NAN then ExitFor Next X Measure Electrical Conductivity ...

Страница 14: ...n If a WC sensor fails indicated by 1000 ES1_WC X 99999 Load NAN for water content Else OR ES1_WC X ES1_SF X c a 1 b apply calibration EndIf EndIf Next X Measure rain PulseCount Rain_mm 1 2 2 0 01 0 Input irrigation events manually in Irrimax 0 must be written to data file Irrig_mm 0 Output Data to Storage CallTable ES1_SF Store Scaled Frequency and VIC Data with Rain and Irrigation for Irrimax So...

Страница 15: ...with an array identifier leading 8 data values per record followed by 8 VIC per record with the record ending with zero rain and irrigation values for compatibility with DBLOAD Irrimax software Assumptions EnviroSMART or EasyAG probe SDI 12 interface is configured to output scaled frequencies Wiring EnviroSMART EasyAG 12 Volts Pin 1 CR10X 12 V EnviroSMART EasyAG Ground Pin 2 CR10X Ground EnviroSMA...

Страница 16: ...order P105 1 0 SDI 12 Address 2 0 Start Measurement aM0 3 7 Port 4 1 Loc ES1_SF_1 5 1 0 Mult 6 0 Offset 7 If X F P89 1 1 X Loc ES1_SF_1 2 2 3 0 F 4 31 Exit Loop if True 8 End P95 Measure salinity volumetric ion content VIC 9 Beginning of Loop P87 1 0 Delay 2 5 Loop Count 10 SDI 12 Recorder P105 1 0 SDI 12 Address 2 2 Start Measurement aM2 3 7 Port 4 17 Loc ES1_VIC_1 5 1 0 Mult 6 0 Offset 11 If X F...

Страница 17: ... Count 17 If X F P89 If 1st sensor reading is 9999 i e 99999 1 1 X Loc ES1_SF_1 then set all sensor readings to 99999 2 4 3 9999 F 4 30 Then Do 18 Z F x 10 n P30 1 99999 F 2 0 n Exponent of 10 3 1 Z Loc ES1_SF_1 19 Z F x 10 n P30 1 99999 F 2 0 n Exponent of 10 3 9 Z Loc ES1_WC_1 20 Z F x 10 n P30 1 99999 F 2 0 n Exponent of 10 3 17 Z Loc ES1_VIC_1 21 Else P94 Otherwise if a sensor scaled frequency...

Страница 18: ...oc RecipB 28 Z X Y P47 1 9 X Loc ES1_WC_1 2 34 Y Loc RecipB 3 9 Z Loc ES1_WC_1 29 End P95 End If 30 End P95 End If 31 End P95 Next Loop Measure Rain 32 Pulse P3 1 1 Reps 2 1 Pulse Channel 1 3 2 Switch Closure All Counts 4 25 Loc Rain_mm 5 1 Mult 6 0 Offset Input irrigation events manually in Irrimax 0 must be written to data file 33 Z F x 10 n P30 1 0 F 2 0 n Exponent of 10 3 26 Z Loc Irrig_mm Out...

Страница 19: ...Rain_mm 40 Sample P70 1 1 Reps 2 26 Loc Irrig_mm Output Water Content Data to Storage 41 Do P86 1 10 Set Output Flag High Flag 0 42 Set Active Storage Area P80 1 1 Final Storage Area 1 2 201 Array ID 43 Real Time P77 1 1220 Year Day Hour Minute midnight 2400 44 Sample P70 1 8 Reps 2 9 Loc ES1_WC_1 Table 2 Program 02 0 0000 Execution Interval seconds Table 3 Subroutines End Program Input Locations ...

Страница 20: ...29 C 1 1 0 30 A 1 1 0 31 _________ 0 0 0 32 B 1 1 0 33 _________ 0 0 0 34 RecipB 1 1 1 10 Care and Maintenance Probe electronics will be damaged if exposed to water or condensation A proper installation must include active desiccant in the cap of each probe Be certain the gland nut through which the cable passes is tight Also maintain the silicon plug material in the sensor end of the cable to ens...

Страница 21: ...2 Interface Power Connection Connect the Intelligent Probe Utility Cable P N SEN06018 to the TTL port near the top of the probe at the location indicated in FIGURE A 2 FIGURE A 2 SDI 12 Interface TTL Connection Connect the other end of the utility cable to the serial port on a PC This may require a 9 to 25 pin serial adaptor CSI serial cable P N 7026 is available as an adaptor Start the IPConfig U...

Страница 22: ...oftware will connect to the probe and set up a configuration window A 1 1 Water Content Only FIGURE A 4 IPConfig Probe Configuration Window FIGURE A 4 shows an IPConfig Utility Probe Configuration window after normalization is complete on a three sensor probe with sensors placed at 10 20 and 30 cm Complete the following operations for a new probe ...

Страница 23: ...the example above 5 Fill the normalization chamber P N SEN70056 or a deep bucket with water If using the normalization chamber take the probe out of the access tube For each sensor slide the probe into the normalization chamber tube such that the sensor is in the center of the tube If using a bucket submerge most of the white tube portion of the probe into the center of the bucket Do not submerge ...

Страница 24: ...rmalizing TriSCAN sensors for water content follow the procedure in A 1 1 using distilled or deionized water in step 5 As illustrated in FIGURE A 5 the same procedure is followed when normalizing TriSCAN sensors for salinity FIGURE A 5 IPConfig Probe Configuration Window for TriSCAN ...

Страница 25: ...Window Test the configuration by going to the Configuration Test tab as shown in FIGURE A 6 Again with the probe in the access tube hold the probe in the air then press Query All Sensors Press Stop Sensor Querying when values appear in the window Raw counts should be close to the values shown in the example above ...

Страница 26: ...Appendix A Normalization and Function Test A 6 ...

Страница 27: ...able production areas B 1 2 Sledgehammer Technique Blows from the sledgehammer should be well directed straight down onto the beating head of the soil auger with as little lateral sideways impact as is possible This minimizes the formation of an air gap between the soil and the access tube Any air gap here will result in preferential path flow of water down the access tube and into deeper soil lay...

Страница 28: ... installation should be re done at another site if correction of air gaps is not progressing well B 2 Installation Tools The basic components required for the EasyAGTM installation are shown below Top Cap EasyAGTM sensor board Probe access tube and joiner Sledgehammer Cutting tip Stabilization brace Soil sampler polyguide Soil Auger Stabilization brace pins long Stabilization brace pins short Easy...

Страница 29: ...nal Computer Tarpaulin Silicone Glue B 3 Installation Procedure Step 1 Assemble and Install the Stabilization Brace The stabilization brace can be used on both flat ground and raised soil beds There are two different types of stabilization brace pins Short pins are for flat ground and long pins are for raised soil beds Option A Flat Ground Place the stabilization brace on the ground where the prob...

Страница 30: ...lization brace and tighten the wing nuts with light finger pressure Place the assembled stabilization brace on the ground directly above the required position of the probe Apply gentle pressure directly down onto the stabilization brace to force the pins into the ground Using a sledgehammer alternately beat the stabilization brace at the points provided to force it closer to the ground Do not beat...

Страница 31: ...ed This is particularly important on clay soils Insert the soil sampler polyguide Step 2 Augering the hole Insert the soil auger and force downward in a single smooth action by hand until the resistance becomes too great Using a sledgehammer beat the auger into the ground all the way Ensure accurate blows are made such that lateral deflection of the soil sampler is minimized Do not compress the so...

Страница 32: ...experience difficulties at this point remove the soil sampler in stages or obtain extra assistance to avoid back injury To remove the soil collected in the soil sampler simply beat on its side with the hand or foot The design is such that the soil core taken is slightly compressed and of a lesser internal diameter than the soil sampler itself Deposit this soil away from the probe site Remove the a...

Страница 33: ... with firm pressure No glue is required Step 4 Inserting the access tube Insert the assembled complete probe into the stabilization brace and push it into the ground in a single gentle movement as far as it will go Do not cause undue inflection of the access tube as this will destroy the integrity of the installation ...

Страница 34: ... the prepared hole in the soil it shaves off a residue that is eventually stored in the cutting tip at the base of the hole Remove the lid of the top cap and extract the electronics Place this safely to one side on a clean dry surface such as a tarpaulin ...

Страница 35: ...top cap and position it on top of the internal access tube Continue inserting the probe using a sledgehammer until there is a 2 5 cm 1 inch gap between the base of the top cap and the edge of the stabilization brace tube guide A 2 5 cm clearance height is important NOTE ...

Страница 36: ...hreads of the stabilization brace pins Separate the two halves of the stabilization brace and remove them Continue inserting the probe into the ground with gentle blows of the sledgehammer using the EasyAGTM dolly until the base of the top cap is level with the ground This will place the top sensor at 10 cm 3 9 inches below the ground surface ...

Страница 37: ...through the cable gland and attach the wiring according to the diagram in Section 4 Step 5 Inserting the Electronics Reinstall the sensor circuitry and attach the connector or attach wiring as required Tighten the cable gland and seal around the inside threaded section with silicone glue Step 6 Fitting the Top Cap Lid Replace the lid of the top cap Tighten the screws completely to ensure an effect...

Страница 38: ...done with the electronics in place Simply excavate a little soil from near the surface grab the probe access tube or top cap give a couple of twists and pull upward In heavy clay soils removal of the EasyAGTM probe may require a greater depth of soil to be excavated before it is possible to remove it by hand To assist in this a mattock may be used Apply gentle levering pressure underneath alternat...

Страница 39: ...removed for easy cleaning using one of the long stabilization brace pins In heavy soils the cutting tip may not be recoverable without digging to the full depth If this is likely to be the case the cutting tip may be glued into place prior to installation Under no circumstances should a wrench be used on the access tube especially while the electronics is still in place as this may cause damage to...

Страница 40: ...Appendix B Tube Installation B 14 ...

Страница 41: ...as a macro zone consists of areas with similar crop water use Micro zone selection determines the position of access tubes in relation to the crop and irrigation system and considers the areas of the root zone canopy spread water distribution uniformity and moisture pattern of drip irrigation Measurements are taken from a small part of the root zone If the extent and depth of the root zone is misj...

Страница 42: ...Appendix C Site Selection C 2 ...

Страница 43: ...nual Commonly used commands are listed below Refer to Edlog and CRBasic help for information on how to use these commands while programming Campbell Scientific dataloggers The EasyAG probe interface accepts SDI 12 addresses in the range of 0 to 9 A to Z and a to z SDI 12 Command Function aAb Change address for use in terminal emulator aM Read soil moisture values 1 to 9 aM1 Read soil moisture valu...

Страница 44: ...Appendix D SDI 12 Commands D 2 ...

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