Related Manuals for Decagon Devices 5TE
Summary of Contents for Decagon Devices 5TE
- Page 1 Water Content, EC and Temperature Sensors Operator’s Manual Version 7 Version 7 Version 7 Version 7...
- Page 2 Decagon Devices, Inc. 2365 NE Hopkins Court Pullman W A 99163 www.decagon.com soils@decagon.com ©2007-2010 Decagon Devices, Inc. All rights reserved...
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Page 3: Table Of Contents
Seller’s Liability ..... . 3 2. About the 5TE ....4 Background Info . - Page 4 5TE Operator’s Manual Table of Contents Connecting to a Non-Decagon Logger ..15 Pigtail End Wiring ......16 6.
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Page 5: Introduction
5TE Operator’s Manual 1. Introduction 1. Introduction Thank you for choosing Decagon’s 5TE for measuring water content, temperature, and EC. This manual is designed to help you understand the sensor’s features and how to use this device successfully. Specifications Volumetric water content Range: Apparent dielectric permittivity (ε... -
Page 6: Contact Information
5TE Operator’s Manual 1. Introduction Temperature Range: -40-50 °C Resolution: 0.1 °C Accuracy: ±1 °C General Dimensions: 10 cm (1) x 3.2 cm (w) x 0.7 cm (d) Prong Length: 5.2 cm Dielectric Measurement Frequency: 70 MHz Measurement Time: 150 ms (milliseconds) Power requirements: 3.6 - 15 VDC, 0.3 mA quiescent, 10... -
Page 7: Seller's Liability
5TE Operator’s Manual 1. Introduction Seller’s Liability Seller warrants new equipment of its own manufacture against defective workmanship and materials for a period of one year from date of receipt of equipment (the results of ordinary wear and tear, neglect, misuse, accident and exces- sive deterioration due to corrosion from any cause are not to be considered a defect);... -
Page 8: About The 5Te
O-TE, but the location of the EC measurement is in the stainless steel screws instead of gold traces. The use of stainless steel screws has made the 5TE a more robust sensor. Additionally, the 5TE utilizes a 5 point dielectric... - Page 9 5TE Operator’s Manual 2. About the 5TE Figure 1: 5TE Components...
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Page 10: Theory
It is located underneath the sensor overmold, next to one of the prongs, and will read the temperature of the prong surface. The 5TE will output temperature in °C unless otherwise stated in your preferences file in either the O DataTrac or ECH O Utility programs. -
Page 11: Converting Bulk Ec To Pore Ec
(conductance) by the cell constant (the ratio of the distance between the electrodes to their area). The 5TE uses a 2-sensor array to measure the EC. The array is located on the screws of two of the 5TE prongs. Small amounts of oil from skin contact with the screws will cause significant inaccuracy in the EC measurement. - Page 12 As one would expect, this is a time consuming and labor intensive process. The 5TE measures the electrical conductivity of the bulk soil surrounding the sensors (σ ). A considerable amount of research has been conducted to determine the relationship between σ...
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Page 13: Pore Water Vs. Solution Ec
5TE Operator’s Manual 3.Theory ε is also measured by the 5TE. Raw VWC counts can be converted to bulk dielectric by the 5TE dielectric calibra- tion: ε ε ε Finally, is an offset term loosely representing the σb=0 dielectric permittivity of the dry soil. Hilhorst (2000) recom- ε... - Page 14 5TE Operator’s Manual 3.Theory soil matrix and that water was collected and tested for EC. Solution EC is the electrical conductivity of pore water removed from a saturated paste. In this case, the soil is wet- ted with distilled water until the soil saturates, then the soil is placed on filter paper in a vacuum funnel and suction is applied.
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Page 15: Calibration
Each 5TE sensor has been calibrated to measure dielectric permittivity (ε ) accurately in the range of 1 (air) to 80 (water). The unprocessed raw values reported by the 5TE in standard serial communication have units of ε *50. When used in SDI-12 communication mode, the unprocessed val- ues have units of ε... -
Page 16: Calibration In Non-Soil Media
5TE sensor which will improve the accuracy to 1-2% for any soil. For more infor- mation on how to perform your own soil-specific calibra- tion, or to have Decagon’s calibration service perform one... - Page 17 5TE Operator’s Manual 4. Calibration tion on how to perform your own medium-specific calibra- tion, or to have Decagon’s calibration service perform one for you, visit http://www.decagon.com. Reference Topp, G.C., J.L. David, and A.P. Annan 1980. Electromag- netic, Determination of Soil Water Content: Measure- ment in Coaxial Transmission Lines.
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Page 18: Connecting To Logger
Em50 datalogger. Simply plug the 3.5mm “stereo plug” connector. directly into one of the five sensor ports. The next step is to configure your logger port for the 5TE and set the measurment interval, this may be done using either ECH... -
Page 19: Mm Stereo Plug Wiring
5TE Operator’s Manual 5. Connecting to Logger it will support the 5TE. To update your software to the latest version, please visit Decagon’s software download site: www.decagon.com/support/downloads. The following software support the 5TE sensor: O Utility 1.12 or greater O Utility Mobile 1.18 or greater O DataTrac 2.77 or greater... -
Page 20: Pigtail End Wiring
(red) to a digital input, the bare ground wire to ground as illustrated below. Digital Supply Ground Switched Digital 3-15V DC Datalogger NOTE: The acceptable range of excitation voltages is from 3-15 VDC. If you wish to read the 5TE with the Campbell... - Page 21 Scientific Data Loggers, you will need to power the sensors off of the switched 12V port. If your 5TE is equipped with the standard 3.5mm plug, and you wish to connect it to a non-Decagon datalogger, you have two options. First, you can clip off the plug on the sen- sor cable, strip and tin the wires, and wire it directly into the datalogger.
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Page 22: Communication
Serial Communication When excitation voltage is applied, the 5TE makes a mea- surment. Within about 120 ms of excitation three measure- ment values are transmitted to the data logger as a serial stream of ASCII characters. -
Page 23: Dielectric Permittivity
Electrical Conductivity The raw electrical conductivity value (σ ), is valid in the range 0 to 1022. The 5TE uses a compression algorithm to extend the range of electrical conductivity that can be repre- sented by a 10-bit value. σ... -
Page 24: Temperature
The raw temperature value, (T ), is valid in the range 0 to 1022. The 5TE uses a compression algorithm to extend the range of temperatures that can be represented by a 10-bit value. The sensor sends temperature with 1/10 of a degree Celsius resolution for the range -40 to 50.0°C. -
Page 25: Sensor Bus
Address The SDI-12 protocol requires that all sensors have a unique address. 5TE sensors come from the factory with an SDI-12 address of 0. To add more than one SDI-12 sensor to a sys- tem, the sensor address must be changed. Address options include {0…9, A…Z, a…z}. -
Page 26: Reading
5TE Operator’s Manual 6. Communication reduce power use (although the 5TE sensors use very little power). Reading SDI-12 communication allows many parameters to be com- municated at once. This allows you to see information such as the sensor model, SDI-12 version, temp, etc. -
Page 27: Installing The Sensors
It is important to avoid air gaps or extremely compact soil around the sensor, which can skew readings. Do not install the 5TE next to large metal objects, which can attenuate the sensors’ electromagnetic field and distort out- put readings. -
Page 28: Procedure
5TE Operator’s Manual 7. Installing the Sensors Procedure The 5TE can be inserted directly into growing media or soil. The tip of each prong has been sharpened to make it easier to push the sensor in. Be careful around the sharpened tips! The sensor needs to be completely covered by soil, as shown in Figure 2. -
Page 29: Orientation
Insert the sensor into the undis- turbed soil face until the entire sensing portion of the 5TE is inserted. The tip of each prong has been sharpened to make it easier to push the sensor in. -
Page 30: Removing The Sensors
5TE Operator’s Manual 7. Installing the Sensors Removing the sensors When removing the 5TE sensor, do not pull it by the cable! This could break the internal wires and cause the sensor to malfunction or not function at all. Multiple sensor Installation ‘The 5TE sensor makes eletrical conductivity (EC) mea-... -
Page 31: Campbell Scientific Programs
5TE Operator’s Manual 8. Campbell Scientific Programs 8. Campbell Scientific Programs Because the sensors uses digital rather than analog commu- nication, they require special considerations when connect- ing to a Campbell Scientific datalogger. Please visit our website at http://www.decagon.com/support/downloads to... -
Page 32: Troubleshooting&Sensor Care
5TE Operator’s Manual 9. Troubleshooting&Sensor Care 9. Troubleshooting&Sensor Care If you encounter problems with the 5TE sensor, they most likely will manifest themselves in the form of incorrect or erroneous readings. Before contacting Decagon about the sensor, do the following: Datalogger 1. - Page 33 5TE Operator’s Manual 9. Troubleshooting&Sensor Care high EC. The most common source of contamination is skin oil from handling the screws traces with bare hands. Figure 3a and 3b show the simplified electrical circuit resulting from a finger print on the screw in a low EC soil and high EC soil, respectively.
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Page 34: Cleaning Method
5TE Operator’s Manual 9. Troubleshooting&Sensor Care Cleaning Method 1. Rub the screws vigorously with Scotch Brite abrasive pad. We recommend using a circular motion and rub- bing for about 5 circles with medium to hard pressure. 2. Rinse the sensor and screws thoroughly with tap or DI water. -
Page 35: Declaration Of Conformity
This is to certify that the ECH O-TE, EC-TM, 5TE and 5TM dielectric soil moisture sensors, manufactured by Decagon Devices, Inc., a corporation based in Pullman, Washington, USA meet or exceed the standards for CE compliance as per the Council Directives noted above. All instruments are built at the factory at Decagon and pertinent testing documentation is freely available for verification. - Page 36 SDI-12 20 Serial (RS232) 18 Contact information 2 Converting bulk EC to pore EC 7 CSI loggers using 5TE probes with 27 Declaration of conformity 31 Dielectric permittivity 11, 19 ECH2O Utility 1.10 14, 15 Electrical conductivity 6 Horizontal installation 25...
- Page 37 5TE Operator’s Manual Index Installation orientation 25 removing the probe 26 Logger Non Decagon 15 Logger communication 17 Mineral soil calibration 11 Perlite Calibration 12 Pore water EC 7 Potting Soil Calibration 12 Power requirements 2 Raw values 19 Rockwool Calibration 12 Screws 7 Seller’s liability 3...
- Page 38 5TE Operator’s Manual Index Temperature 6, 20 how 5TE measures 6 Troubleshooting 28 Vertical installation 25 Volumetric water content 6 Warranty information 2 Wiring Pigtail 16 Stereo Plug 15...
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