GroPoint 2625-S-T Series Operation Manual

Profile profilemulti segment multi segment multi segment soil moisture & temperature profiling probe

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GroPoint™ ™ ™ ™ Profile

GroPoint

Soil Moisture & Temperature

Models 2625-S-T-x, 2625-S-x

OPERATION MANUAL

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RIOT Technology Corp. | #220–10114 McDonald Park Rd | North Saanich V8L5X8, BC Canada | +1.250.412.6642

Profile Multi Segment

Profile

Profiling Probe

March

March 202

March

V1.

V1.1 1 1 1 . . . . 7 7 7 7

V1.

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Multi Segment

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Summary of Contents for GroPoint 2625-S-T Series

Page 1 GroPoint GroPoint™ ™ ™ ™ Profile GroPoint GroPoint Profile Profile Profile Multi Segment Multi Segment Multi Segment Multi Segment Soil Moisture & Temperature Soil Moisture & Temperature Soil Moisture & Temperature Soil Moisture & Temperature Profiling Probe Profiling Probe Profiling Probe...
Page 2: Table Of Contents
P a g e Table of Contents Overview ........................... 4 Technology (TDT) ......................4 GroPoint™ Profile Model Variations ..................5 Probe Technology ......................6 Wiring Connections ......................7 Reading Methods ....................... 7 Sensor Start Up Time / Measurement Time ................8 Important Things to Note ....................
Page 3 Appendix D: MODBUS Programming Manual ................33 MODBUS Command Functions ..................33 Data Values ........................34 GPLP MODBUS Register Lists ..................35 Detailed Description of Holding Registers ..............39 Coil Registers ........................40 Discrete Inputs ......................40 Appendix E: Accessories ....................41 Certificate of Compliance EU/Declaration of Conformity ............42 About GroPoint™ ........................43...
Page 4: Overview
This allows for the accurate de- termination of the soil moisture content. GroPoint™ TDT⁵ profiling probes detect water as much as 5 centimetres (2 inches) from the surface of the probe fins although, like all dielectric based sensors, moisture closest to the sur-...
Page 5: Gropoint™ Profile Model Variations
P a g e GroPoint™ Profile Model Variations The GroPoint™ Profile sensor can be ordered with and without temperature sensors. The in- formation in this manual covers material for sensors with temperature sensors. If you have or- dered sensors without temperature sensors, the commands applicable to the temperature sen- sor readings will be inactive.
Page 6: Probe Technology
P a g e Probe Technology The drawing below shows the probe dimensions of the 2-8 segment probes, Temperature sen- sor locations provided in table below:...
Page 7: Wiring Connections
GroPoint™ GP-USB Connect - SDI-12 Sensor (Part# 6300) is a USB to Sensor interface that connects sensors directly to application software on a USB equipped computer. GroPoint™ accessories are listed in appendix E of this manual.
Page 8: Sensor Start Up Time / Measurement Time
Responses from the sensor always include the sensor’s address as the first character and are always terminated with the <CR><LF> (carriage return-line feed) sequence. Basic SDI-12 Command List The GroPoint™ Lite Profiling Probes respond to the following basic SDI-12 commands. In all cases, = sensor address. Default sensor address is ‘0’.
Page 9: Understanding The Basic Commands
This ID string identifies the supported SDI-12 compatibility level as 1.3, sensor vendor as ‘RIOTTECH’ (RIOT Technology Corp.), the sensor model as GPLPTS (GroPoint™ Lite Profiling with soil temperature), the firmware version as ‘035’ (V3.5 firmware), and the sensor’s serial number as 300123.
Page 10: Start Measurement Command: Am! Or Am1! Or Am2
10 | P a g e communication bus, they must all have a unique address. ASCII '0' through ASCII '9' are the standard addresses. Should there be a need for more than 10 sensors, you can also use an ad- dress in the range ASCII 'A' through ASCII 'Z' and ASCII 'a' through ASCII 'z'.
Page 11: Send Data Command: Ad0! And Ad1
11 | P a g e (sensor 0 will be ready in 002 seconds with 04 measurements) 0C0!000204<CR><LF> (sensor 1 will be ready in 002 seconds with 04 measurements) 1C!100204<CR><LF> Send Data Command: aD0! and aD1! Use this command to instruct the sensor to return the measurement results. The sensor re- sponds with its address, and the moisture values for each segment from top to bottom.
Page 12: Extended Sdi-12 Command List
12 | P a g e Extended SDI-12 Command List Overview The extended SDI-12 commands are used to adjust the sensor settings and moisture calcula- tion equation. Caution must be exercised when using the extended commands, as certain com- binations of commands could render the sensor partially or completely inoperable or corrupt the sensor’s base calibration.
Page 13: Read/Write Coefficient/Scale Factor Setting: Axcn
13 | P a g e aXM! aMode: n<CR><LF> read the current mode setting aXMn! aMode: n<CR><LF> write the new mode setting to n Read/Write Coefficient/Scale Factor Setting: aXCn! This command is used to read or write the third order calibration coefficients used for custom soil calibrations.
Page 14: Additional Product Information
14 | P a g e aXC1D! aXC1D{float value}! 0 aXC2S! aXC2S{float value}! 0.024414 aXC2A! aXC2A{float value}! aXC2B! aXC2B{float value}! aXC2C! aXC2C{float value}! aXC2D! aXC2D{float value}! 0 aXC3S! aXC3S{float value}! 0.024414 aXC3A! aXC3A{float value}! aXC3B! aXC3B{float value}! aXC3C! aXC3C{float value}! aXC3D! aXC3D{float value}! 0 4 to 8…...
Page 15: Appendix A: Probe Installation / Extraction
The slide hammer Insertion toolkit is used to form a pilot hole using the steel pilot rod. Then insert a GroPoint™ Lite profiling probe into this preformed hole. The pilot rod has the same cross section as the profiling probe. For accurate readings it is essential to use the pi- lot rod to pre-form the hole for the profiling probe.
Page 16: Sensor Installation Guidelines
16 | P a g e Sensor Installation Guidelines Before installing the sensor, follow these guidelines. • Install the probe when the soil is dry to minimize the air gaps that can form around the probe as the soil dries out. Also avoid excessively rocky soil whenever possible as cavities may form when rocks are pushed out of the way when creating the pilot hole.
Page 17: Slide Hammer And Pilot Rod Installation Method
17 | P a g e Slide Hammer and Pilot Rod Installation Method 1. For assembled pilot rods, skip to step 2. For disassembled pilot rods, select the appropri- ate number of middle rod segments based on the length of your probe. Assemble the pilot rod by screwing one segment into the other, connecting each rod segment to- gether to form the body of the pilot rod, making sure all edges are aligned.
Page 18: Auger Installation Method
Removing the Sensor from the Soil The following procedure can be used to remove installed GroPoint Lite Profiling sensors. The top portion of the sensor is exposed, and then a gouge auger is used to loosen the soil around the remainder of the sensor until enough soil has been loosened/removed that the sensor can be easily pulled from the ground.
Page 19 19 | P a g e 2. Use the shovel to excavate around the top of the sensor to expose at least 6 inches (15 cm) of the sensor housing. This is essential to ensure that one can properly line up the gouge auger with the sensor.
Page 20 20 | P a g e 3. Line up the gouge auger in-line with the sensor. Be careful to avoid cutting the cable with the auger. Use the slide hammer to drive the gouge auger in-line with the sensor about 6 inches (15 cm). Note: the gouge auger is marked with depth lines every 6 inches.
Page 21 21 | P a g e 6. Eventually, enough of the sensor will be free of tight contact with the soil that the sen- sor can be easily pulled from the ground. Only grab the sensor along the blue housing, never pull on the black cap of the sensor.
Page 22: Appendix B: Soil Specific Calibration Process
These differences are generally small, on the order of a few percent, however for highest accu- racy the user may wish to calibrate for the specific soil type used in their own application. The process described here may be used to custom calibrate the GroPoint™ Lite Profiling probes for specific soil types.
Page 23: Equipment Required
23 | P a g e Repeat the above process, increasing the moisture by approximately 5% for each step, until a saturated soil is achieved. Seven to eight moisture levels should be used. When all the data is collected, chart the results, and then apply a polynomial fit to the data points to establish the soil calibration coefficients.
Page 24: Procedure
24 | P a g e Note: Required Soil Container / Box Note: Required Soil Container / Box Note: Required Soil Container / Box Note: Required Soil Container / Box Must be of sufficient volume to contain enough soil to extend at least 7-8 cm around the probe in all directions.
Page 25 25 | P a g e 2. Measure Soil Moisture Installing the Probe Installing the Probe Installing the Probe Installing the Probe Install the probe into the soil box. First remove about half the soil, then pack the probe horizon- tally in the soil box.
Page 26 26 | P a g e Note: It is hard to make clay soils 'non-lumpy', but all big clumps should be rubbed out. Also, when soil gets very wet, do not pack too hard or this will squeeze water out. Waiting Period Waiting Period Waiting Period...
Page 27 27 | P a g e 3.80 4.46 3.62 4.00 4.10 6.88 7.60 7.00 7.18 7.62 9.66 10.88 9.46 9.42 12.02 11.64 12.24 11.42 12.76 17.74 17.90 19.10 21.10 20.66 22.87 22.20 24.86 25.08 26.92 29.29 32.82 34.28 33.68 34.78 33.20 Use this table of data to plot an X-Y (Scatter) chart, sub type is data points with no line.
Page 28: Entering Coefficients Into The Probe
28 | P a g e coefficients. The R2 value is a measure of how well the trend line fits the data (above 0.98 is good, the closer to 1, the better the fit is). Note (what polynomial order to use): Depending on the data collected, it may be better to use a second order polynomial rather than a third order polynomial.
Page 29: Appendix C: Determining Volumetric Moisture Content (Weight Method - In Laboratory)
29 | P a g e Appendix C: Determining Volumetric Moisture Content (Weight Method – In Laboratory) Procedure Overview The following procedure describes a method to determine the volumetric moisture content of a soil sample. A soil sample of a known volume is taken, and its weight is recorded. The soil sam- ple is dried.
Page 30 30 | P a g e 1. Let covered soil box sit for an hour or more after adding water. 2. Stir soil with trowel or fingers, then tamp soil down to desired compaction level (ideally this would be with the probe still in the soil, just after the probe measurements are taken).
Page 31 31 | P a g e 5. Remove the sampling ring from the soil by scraping the surrounding soil away (use the tongue depressor) until the ring is exposed. 6. Cut away any excess soil from the open ends of the sampling ring, and also ensure the that the outside of the sampling ring is free of soil.
Page 32: Example Calculation
32 | P a g e 9. Microwave the cup and soil for 2 minutes, then stir. Weigh again. CAUTION: the bowl will be hot. Repeat this step until there is no further change in weight. Record the final weight. 10.
Page 33: Appendix D: Modbus Programming Manual
P a g e Appendix D: MODBUS Programming Manual The GroPoint Lite Profiling Probe (GPLP) MODBUS version uses standard MODBUS RTU protocol (RS-485). The probe can only operate as a slave device. Sensor factory default address is 01. The sensor address can be changed via holding register 40201 (see below). Default communi- cation settings are 19200 Baud, 8 Bits, Even Parity, one Stop Bit.
Page 34: Data Values
34 | P a g e Exception Responses Exception Responses Exception Responses Exception Responses Illegal commands and register data addresses, etc. will result in an exception response. The re- ply has the top bit of the Function Code set and contains a one-byte exception code. For exam- ple, a read coil command (not supported on GPLP probes) to slave 0x01 will generate this re- sponse: 01 81 01 CRC...
Page 35: Gplp Modbus Register Lists
35 | P a g e Moisture and temperature readings from input registers are stored as 16-bit signed integers and will be returned without a decimal place. To obtain the true result, the decimal place setting must be applied. The default setting for this is 1 decimal place, so for example a decimal inte- ger value of 123 indicates 12.3 % volumetric moisture content for soil moisture, or 12.3 °C for the soil temperature sensor.
Page 36 36 | P a g e 30004 Segment 4 Moisture reading GPLP-4, GPLP-5, GPLP-6, GPLP-8 30005 Segment 5 Moisture reading GPLP-5, GPLP-6, GPLP-8 30006 Segment 6 Moisture reading GPLP-6, GPLP-8 30007 Segment 7 Moisture reading GPLP-8 30008 Segment 8 Moisture reading GPLP-8 30009 undefined (reserved for future use)
Page 37 37 | P a g e command. This command will return the measured values. It does not trigger another meas- urement until another read input command is received. Attempts to read the registers before the measurement time has elapsed will be ignored; there will be no response, the sensor will only respond once the measurements are completed.
Page 38 38 | P a g e 40017-40018 Segment 2 third order polynomial C (32-bit IEEE float) 40019-40020 Segment 2 third order polynomial D (32-bit IEEE float) 40021-40022 Segment 3 scale factor (32-bit IEEE float)* 0.0244140625* 40023-40024 Segment 3 third order polynomial A (32-bit IEEE float) 40025-40026 Segment 3 third order polynomial B (32-bit IEEE float) 40027-40028...
Page 39: Detailed Description Of Holding Registers
39 | P a g e Detailed Description of Holding Registers Third Order Polynomial Coefficients and Scaling Factors (registers 40001 Third Order Polynomial Coefficients and Scaling Factors (registers 40001 Third Order Polynomial Coefficients and Scaling Factors (registers 40001 Third Order Polynomial Coefficients and Scaling Factors (registers 40001 to 40080, offset 0 to 79) to 40080, offset 0 to 79) to 40080, offset 0 to 79)
Page 40: Coil Registers
40 | P a g e Sensor Calculation Mode (register 40202, decimal offset 201 (hexadecimal 0x00C0)) This register set to 1 means to apply the third order polynomial to the measured moisture val- ues. When set to 0 this means return the “raw” moisture values. Default third order coefficients are 0, 0, 1, and 0 so by default the sensor returns the “raw”...
Page 41: Appendix E: Accessories
GP-DLBT Bluetooth SDI-12 Dat- Instantaneous Readings ity Battery Part 6300 Part 6300 Part 6300 Part 6300 alogger Part 2992 Part 2992 Part 2992 Part 2992 Part Part 2628 2628 Part Part 2628 2628 Click here for full description of GroPoint Accessories...
Page 42: Certificate Of Compliance Eu/Declaration Of Conformity
Canada for the following product(s): Models: GroPoint Lite Profiling Probes (all segment and temperature sensor configurations) Any model with part numbers starting with 2625, or 3060. The object of the declaration described above is in conformity with the relevant Union harmoni-...
Page 43: About Gropoint
GroPoint™ is the brand associated with RioT soil moisture and temperature monitoring solutions and technology. We have the historical expertise for all GroPoint™ products in-house and available to assist former clients of E.S.I. Environmental Sensors , and new clients interested in leveraging over 25 years of soil monitor- ing expertise across the science, agricultural, smart agriculture, irrigation, hydrological and indus- trial sectors.

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