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5TM 13441-01 4.9.2018 TABLE OF CONTENTS 1. Introduction............................................................................................... 1 2. Operation.................................................................................................... 2 2.1 Installation................................................................................................. 2 2.2 Removing the Sensor.................................................................................. 4 2.3 Connecting.................................................................................................. 4 2.3.1 Connect to METER Data Logger......................................................... 5 2.3.2 Connect to a Non-METER Data Logger.............................................. 5 2.4 Communication.......................................................................................... 6 3. System.......................................................................................................... 7 3.1 Specifications............................................................................................. 7 3.2 About 5TM................................................................................................ 10 3.3 Theory....................................................................................................... 10 3.3.1 Volumetric Water Content............................................................... 10 3.3.2 Temperature................................................................................... 11 4. Service........................................................................................................ 12 4.1 Calibration................................................................................................ 12 4.1.1 Dielectric Permittivity..................................................................... 12 4.1.2 Mineral Soil Calibration.................................................................. 12 4.1.3 Calibration in Nonsoil Media........................................................... 13 4.2 Troubleshooting........................................................................................ 13 4.3 Customer Support.................................................................................... 14 4.4 Terms and Conditions............................................................................... 15 i 5TE References..................................................................................................... 17 Index.................................................................................................................. 18 ii iii 5TE 1. INTRODUCTION Thank you for choosing the ECH2O 5TM Volumetric Water Content (VWC) and Temperature sensor from METER Group. This manual guides the customer through the sensor features and describes how to use the sensor successfully. METER hopes the contents of this manual are useful in understanding the instrument and maximizing its benefit. Prior to use, verify the 5TM arrived in good condition. 1 Operation 2. OPERATION Please read all instructions before operating the 5TM to ensure it performs to its full potential. PRECAUTIONS METER sensors are built to the highest standards, but misuse, improper protection, or improper installation may damage the sensor and possibly void the manufacturer’s warranty. Before integrating 5TM into a system, make sure to follow the recommended installation instructions and have the proper protections in place to safeguard sensors from damage. 2.1 INSTALLATION When selecting a site for installation, remember that the soil adjacent to the sensor surface has the strongest influence on the sensor reading and that the sensor measures the VWC of the soil. Therefore, any air gaps or excessive soil compaction around the sensor and in between the sensor prongs can profoundly influence the readings. • If installing sensors in a lightning-prone area with a grounded data logger, please read Lightning surge and grounding practices. • Test the sensors with the data logging device and software before going to the field. Do not install the sensor adjacent to large metal objects such as metal poles or stakes. This can attenuate the sensor's electromagnetic field and adversely affect readings. In addition, the 5TM sensor should not be installed within 5 cm of the soil surface, or the sensing volume of the electromagnetic field can extend out of the soil and reduce accuracy. Because the 5TM has gaps between its prongs, it is also important to consider the particle size of the medium. It is possible to get sticks, bark, roots or other material stuck between the sensor prongs, which will adversely affect readings. Finally, be careful when inserting the sensors into dense soil, as the prongs can break if excessive sideways force is used when pushing them in. When installing the 5TM, it is imperative to maximize contact between the sensor and soil. The sensor needs to be completely covered by soil (Figure 1). 2 5TE Figure 1 Example of 5TE proper installation For most accurate results, the sensor should be inserted into undisturbed soil. There are two basic methods to accomplish a high-quality installation. With either of these methods, the sensor may still be difficult to insert into extremely compact or dry soil. NOTE: Never pound the sensor into the soil! If there is difficulty inserting the sensor, loosen or wet the soil. This will result in inaccurate VWC measurements until the water added during installing redistributes into the surrounding soil METHOD 1. HORIZONTAL INSTALLATION 1. Excavate a hole or trench a few centimeters deeper than the depth at which the sensor is to be installed. 2. At the installation depth, shave off some soil from the vertical soil face exposing undisturbed soil. 3. Insert the sensor into the undisturbed soil face until the entire sensor is inserted. The tip of each prong has been sharpened to make it easier to push the sensor into the soil. Be careful with the sharp tips! 4. Backfill the trench taking care to pack the soil back to natural bulk density around the sensor body of the 5TM. METHOD 2. VERTICAL INSTALLATION 1. Auger a 3-in hole to the depth at which the sensor is to be installed. 2. Insert the sensor into the undisturbed soil at the bottom of the auger hole using a hand or any other implement that will guide the sensor into the soil at the bottom of the hole. Many people have used a simple piece of PVC pipe with a notch cut in the end for the sensor to sit in, with the sensor cable routed inside the pipe. 3. After inserting the sensor, remove the installation device and backfill the hole taking care to pack the soil back to natural bulk density while not damaging the black overmolding of the sensor and the sensor cable in the process. 3 Operation View a visual demonstration on proper installation of the sensor in How to install soil moisture sensors. The sensor can be oriented in any direction. However, orienting the flat side perpendicular to the surface of the soil will minimize effects on downward water movement. The sensor measures the average VWC along its length, so a vertical installation will integrate VWC over a 10-cm depth while a horizontal orientation will measure VWC at a more discrete depth. This problem occurs regardless of which logging system is being used if the ground wires are connected at all times. If sensors must be close together (e.g., column experiments), consider a multiplexing option that would isolate the ground wires. If installing sensors vertically at short depth intervals, do not bury them directly over the top of each other. Although at times the vertical distance may be less than 20 cm, the sensors can be staggered horizontally so they are not directly above each other, thus meeting the distance requirement. 2.2 REMOVING THE SENSOR When removing the sensor from the soil, do not pull it out of the soil by the cable! Doing so may break internal connections and make the sensor unusable. 2.3 CONNECTING The 5TM works most efficiently with METER ZENTRA, EM60, or Em50 data loggers, and it can also be used with other data loggers, such as those from Campbell Scientific, Inc. 5TM sensors require an excitation voltage in the range of 3 to 15 VDC. The 5TM sensors come with a 3.5-mm stereo plug connector (Figure 2) to facilitate easy connection with METER loggers. 5TM sensors may be ordered with stripped and tinned wires to facilitate connecting to some third-party loggers (Section 2.3.2). Ground Data Power Figure 2 Stereo plug connector The 5TM sensor comes standard with a 5-m cable. It may be purchased with custom cable lengths for an additional fee (on a per-meter basis). This option eliminates the need for splicing the cable (a possible failure point). However, the maximum recommended length is 75 m. 4 5TE 2.3.1 CONNECT TO METER DATA LOGGER The 5TM sensor works seamlessly with METER ZENTRA, EM60, or Em50 data loggers. Check the METER download webpage for the most recent data logger firmware. Logger configuration may be done using either ZENTRA Utility (desktop and mobile application) or ZENTRA Cloud (web-based application for cell-enabled ZENTRA data loggers). 1. Plug the 3.5-mm stereo plug connector into one of the sensor ports on the logger. 2. Using the appropriate software application, configure the chosen logger port for 5TM. 3. Set the measurement interval. 2.3.2 CONNECT TO A NON-METER DATA LOGGER The 5TM sensor can be used with non-METER (third-party) data loggers. Refer to the thirdparty logger manual for details on logger communications, power supply, and ground ports. 5TM sensors can be ordered with stripped and tinned (pigtail) connecting wires for use with screw terminals. Connect the 5TM wires to the data logger as illustrated in Figure 3 and Figure 4, with the power supply wire (brown) connected to the excitation, the digital out wire (orange) to a digital input, and the bare ground wire to ground. Power (brown) Ground (bare) Data (orange) Figure 3 Pigtail wiring NOTE: Some 5TM sensors may have the older Decagon wiring scheme where the power supply is white, the digital out is red, and the bare wire is ground. Power (brown) (orange) Data Ground Switched 3.6–15 VDC Digital In G (bare) Data Logger Figure 4 Wiring diagram NOTE: The acceptable range of excitation voltages is from 3 to 15 VDC. To read 5TM sensors with Campbell Scientific data loggers, power the sensor from a switched 12-V port or a 12-V port if using a multiplexer. If the 5TM cable has a standard 3.5-mm stereo plug connector and will be connected to a non-METER data logger, please use one of the following two options. 5 Operation Option 1 1. Clip off the 3.5-mm stereo plug connector on the sensor cable. 2. Strip and tin the wires. 3. Wire it directly into the data logger. This option has the advantage of creating a direct connection with no chance of the sensor becoming unplugged. However, it then cannot be easily used in the future with a METER readout unit or data logger. Option 2 Obtain an adapter cable from METER. The adapter cable has a connector for the female stereo plug connector on one end and three wires (or pigtail adapter) for connection to a data logger on the other end. The stripped and tinned adapter cable wires have the same termination as seen in Figure 4: the brown wire is excitation, the orange is output, and the bare wire is ground. NOTE: Secure the stereo plug connector to the pigtail adapter connections to ensure the sensor does not become disconnected during use. Because 5TM sensors use digital communication, they require special considerations when connecting to an SDI-12 data logger. Read SDI-12 example programs to view sample Campbell Scientific programs. 2.4 COMMUNICATION The 5TM sensor communicates using two different methods, DDI serial and SDI-12. Please see the 5TM Integrator Guide for detailed instructions. 6 5TE 3. SYSTEM This section describes the 5TM sensor. 3.1 SPECIFICATIONS MEASUREMENT SPECIFICATIONS Volumetric Water Content (VWC) Range Mineral soil calibration 0.0–1.0 m3/m3 Soilless media calibration 0.0–1.0 m3/m3 Apparent dielectric 1 (air) to 80 (water) permittivity (εa) Resolution 0.0008 m3/m3 from 0%–50% VWC Accuracy Generic calibration ± 0.03 m3/m3 typical Medium-specific calibration ±0.02 m3/m3 Apparent dielectric 1–40 (soil range), ±1 εa (unitless) permittivity (εa) 40–80, 15% measurement Temperature Range –40 to +60 °C Resolution 0.1 °C Accuracy ±1 °C COMMUNICATION SPECIFICATIONS Output DDI serial or SDI-12 communication protocol Data Logger Compatibility Data acquisition systems capable of 3.6- to 15.0-VDC power and serial or SDI‑12 communication 7 System PHYSICAL SPECIFICATIONS Dimensions Length 10.9 cm (4.3 in) Width 3.4 cm (1.3 in) Height 1.0 cm (0.4 in) Prong Length 5.0 cm (1.9 in) Operating Temperature Range Minimum Typical Maximum –40 °C NA +60 °C NOTE: Sensors may be used at higher temperatures under certain conditions; contact Customer Support for assistance. Cable Length 5 m (standard) 75 m (maximum custom cable length) NOTE: Contact Customer Support if a nonstandard cable length is needed. Connector Types 3.5-mm stereo plug connector or stripped and tinned wires ELECTRICAL AND TIMING CHARACTERISTICS Supply Voltage (VCC to GND) Minimum Typical Maximum 3.6 VDC NA 15.0 VDC Digital Input Voltage (logic high) Minimum 2.8 V Typical 3.0 V Maximum 3.9 V 8 5TE Digital Input Voltage (logic low) Minimum –0.3 V Typical 0.0 V Maximum 0.8 V Power Line Slew Rate Minimum 1.0 V/ms Typical NA Maximum NA Current Drain (during measurement) Minimum 0.5 mA Typical 3.0 mA Maximum 10.0 mA Current Drain (while asleep) Minimum Typical NA 0.03 mA Maximum NA Power-Up Time (DDI serial) Minimum NA Typical NA Maximum 100 ms Power-Up Time (SDI-12) Minimum 100 ms Typical 150 ms Maximum 200 ms Measurement Duration Minimum NA Typical 150 ms Maximum 200 ms 9 System COMPLIANCE Manufactured under ISO 9001:2015 EM ISO/IEC 17050:2010 (CE Mark) 3.2 ABOUT 5TM The 5TM is designed to measure the water content and temperature of soil (Figure 5). The 5TM uses an oscillator running at 70 MHz to measure the dielectric permittivity of soil to determine the water content. A thermistor in thermal contact with the sensor prongs provides the soil temperature. The polyurethane coating on the 5TM circuit board protects the components from water damage and gives the sensor a longer life span. Connection cable Thermal sensor (thermistor) Polyurethane overmolding Dielectric VWC sensor Figure 5 5TM components 3.3 THEORY The following sections explain the theory of VWC and temperature measured by 5TM. 3.3.1 VOLUMETRIC WATER CONTENT The 5TM sensor uses an electromagnetic field to measure the dielectric permittivity of the surrounding medium. The sensor supplies a 70 MHz oscillating wave to the sensor prongs that charges according to the dielectric of the material. The stored charge is proportional to soil dielectric and soil VWC. The 5TM microprocessor measures the charge and outputs a value of dielectric permittivity from the sensor. 10 5TE 3.3.2 TEMPERATURE The 5TM uses a surface-mounted thermistor to take temperature readings. The thermistor is underneath the sensor overmold, next to one of the prongs, and it reads the temperature of the prong surface. The 5TM outputs temperature in degrees Celsius unless otherwise stated in the software preferences file. If the black polyurethane overmold of the sensor body is in direct sunshine, the temperature measurement may read high. Do not install the sensor with the overmold in the sun. 11 Service 4. SERVICE This section contains calibration and recalibration information, calibration frequencies, cleaning and maintenance guidelines, troubleshooting guidelines, customer support contact information, and terms and conditions. 4.1 CALIBRATION METER software tools automatically apply factory calibrations to the sensor output data. However, this general calibration may not be applicable for all soil types. For added accuracy METER encourages customers to perform soil-specific calibrations. 4.1.1 DIELECTRIC PERMITTIVITY METER factory calibrates each 5TM sensor to measure dielectric permittivity (εa) accurately in the range of 1 (air) to 80 (water). The unprocessed raw values reported by the 5TM in standard serial communication have units of 50εa. When used in SDI-12 communication mode, the unprocessed values have units of εa (for 5TM board versions R2.04 and older, units are 100εa ). 4.1.2 MINERAL SOIL CALIBRATION Numerous researchers have studied the relationship between dielectric permittivity and VWC in soil. As a result, numerous transfer equations that predict VWC from measured dielectric permittivity. Use any of these various transfer equations to convert raw dielectric permittivity data from the 5TM into VWC. If using the mineral soil calibration option in METER ProCheck reader, DataTrac 3, or ECH2O Utility, they convert raw dielectric permittivity values with the Topp equation (Topp et al. 1980). VWC = 4.3 × 10−6 ε a3 − 5.5 × 10−4 ε a2 + 2.92 × 10−2 ε a − 5.3 × 10−2 Equation 1 METER tests show that in a properly installed 5TM sensor in a normal mineral soil with saturation extract electrical conductivity <10 dS/m, the Topp equation results in measurements within 3% VWC of the actual soil VWC. If a more accurate VWC is required, such as working in a soil with very high EC or nonnormal mineralogy, then it may be necessary to conduct a soil-specific calibration for the 5TM sensor to improve the accuracy to 1% to 2% for any soil. There are two options for soil-specific calibration. • Follow the step-by-step instructions for calibrating soil moisture sensors in the application note Calibrating ECH2O soil moisture probes. • METER offers a service providing soil specific calibrations. This calibration service also applies to soilless materials, such as compost or potting materials. Contact Customer Support for more information. 12 5TE 4.1.3 CALIBRATION IN NONSOIL MEDIA METER has performed calibrations with the 5TM in several nonsoil growth media. The following are suggested calibration equations for some common materials. Potting Soil VWC = 2.25 × 10−5 ε a3 − 2.06 × 10−3 ε a2 + 7.24 × 10−2 ε a − 0.247 Equation 2 VWC = 1.68 × 10−3 ε a2 + 6.56 × 10−2 ε a + 0.0266 Equation 3 VWC = −1.07 × 10−3 ε a2 + 5.25 × 10−2 ε a − 0.0685 Equation 4 Rockwool Perlite METER continually develops additional calibration equations for various other growth media as opportunities arise. Contact Customer Support for the status of this ongoing research. The 5TM can accurately read VWC in virtually any porous medium if a custom calibration is performed (Section 4.1.2). Contact Customer Support for more information. 4.2 TROUBLESHOOTING If problems with the 5TM are encountered, they most likely manifest themselves in the form of incorrect or erroneous readings. Review the information in Table 1 and the Troubleshooting METER soil moisture sensors video to identify the problem. Contact Customer Support for more information. Table 1 Troubleshooting the 5TM Problem Possible Solution Check power to the sensor. Check sensor cable and stereo plug connector integrity. Sensor not responding Check data logger wiring to ensure brown is power supply, orange is digital out, and bare is ground. NOTE: Some 5TM sensors may have the older Decagon wiring scheme where the power supply is white, the digital out is red, and the bare wire is ground. Sensor reading too low (or slightly negative) Check for air gaps around sensor needles. These could be produced below the surface of the substrate when the needle contacts a large piece of material and pushes it out of the way, or if the sensor is not inserted perfectly linearly. Ensure the calibration equation being used is appropriate for the media type. There are significant differences between substrate calibrations, so be sure to use the one specific to the substrate. 13 Service Table 1 Troubleshooting the 5TM (continued) Problem Possible Solution Check to make sure that the media was not packed excessively or insufficiently during sensor installation. Higher density can cause sensor reading to be elevated. Ensure the calibration equation being used is appropriate for the media type. There are significant differences between calibrations, so be sure to use the one most suitable to the substrate, or consider developing a substrate-specific calibration for the particular medium. Sensor reading too high Some substrates have an inherently high dielectric permittivity (soils of volcanic origin or high titanium, for instance). If the substrate has a dry dielectric permittivity above 6, a custom calibration may need to be performed. Soils with a bulk EC >10 dS/m require substrate-specific calibrations (Section 4.1). If a stereo plug connector is damaged or needs to be replaced, contact Customer Support for a replacement connector and splice kit. Cable or stereo plug connector failure If a cable is damaged, follow these guidelines for wire splicing and sealing techniques. 4.3 CUSTOMER SUPPORT Customer service representatives are available for questions, problems, or feedback Monday through Friday, 7 am–5 pm Pacific time. Email: support.environment@metergroup.com sales.environment@metergroup.com Phone: +1.509.332.5600 Fax: +1.509.332.5158 Website: metergroup.com If contacting METER by email, please include the following information: Name Address Phone Email address Instrument serial number Description of the problem NOTE: For 5TM sensors purchased through a distributor, please contact the distributor directly for assistance. 14 5TE 4.4 TERMS AND CONDITIONS CONTRACT FORMATION. All requests for goods and/or services by METER Group, Inc. USA (METER) are subject to the customer’s acceptance of these Terms and Conditions. The Buyer will be deemed to have irrevocably accepted these Terms and Conditions of Sale upon the first to occur of the Buyer’s issuance of a purchase order or request for goods or services. Unless expressly assented to in writing by METER, terms and conditions different are expressly rejected. No course of dealing between the parties hereto shall be deemed to affect or to modify, amend, or discharge any provisions of this agreement. PRICES AND PAYMENT. Invoice prices will be based upon METER prices as quoted or at METER list price in effect at the time an order is received by the Seller. Prices do not include any state or federal taxes, duties, fees, or charges now or hereafter enacted applicable to the goods or to this transaction, all of which are the responsibility of the Buyer. Unless otherwise specified on the invoice, all accounts are due and payable 30 days from the date of invoice. Unpaid accounts extending beyond 30 days will be subject to a service charge of 2% per month (24% per annum). Should Seller initiate any legal action or proceeding to collect on any unpaid invoice, Seller shall be entitled to recover from Buyer all costs and expenses incurred in connection therewith, including court costs and reasonable attorney’s fees. RISK OF LOSS AND DELIVERY TITLE. Liability for loss or damage passes to the Buyer when the Seller delivers the goods on the Seller’s dock or to the transporting agent, whichever occurs first. The Seller has the right to deliver the goods in installments. Shipping and delivery dates communicated by the Seller to the Buyer are approximate only. SHIPMENT. In the absence of specific shipping instructions, the Seller, if and as requested by the Buyer, will ship the goods by the method the Seller deems most advantageous. Where the Seller ships the goods, the Buyer will pay all transportation charges that are payable on delivery or, if transportation charges are prepaid by the Seller, the Buyer will reimburse the Seller upon receipt of an invoice from the Seller. The Buyer is obligated to obtain insurance against damage to the goods being shipped. Unless otherwise specified, the goods will be shipped in the standard Seller commercial packaging. When special packing is required or, in the opinion of the Seller, required under the circumstances, the cost of the special packaging shall be the responsibility of the Buyer. INSPECTION AND ACCEPTANCE. Goods will be conclusively deemed accepted by the Buyer unless a written notice setting out the rejected goods and the reason for the rejection is sent by the Buyer to the Seller within 10 days of delivery of the goods. The Buyer will place rejected goods in safe storage at a reasonably accessible location for inspection by the Seller. CUSTOM GOODS. There is no refund or return for custom or nonstandard goods. WARRANTIES. The Seller warrants all equipment manufactured by it to be free from defects in parts and labor for a period of one year from the date of shipment from factory. The liability of the Seller applies solely to repairing, replacing, or issuing credit (at the Seller’s sole discretion) for any equipment manufactured by the Seller and returned by the Buyer during the warranty period. SELLER MAKES NO SEPARATE OR OTHER WARRANTY 15 Service OF ANY NATURE WHATSOEVER, EXPRESS OR IMPLIED, INCLUDING THE WARRANTY OF MERCHANTABILITY OR FOR A PARTICULAR PURPOSE. There shall be no other obligations either expressed or implied. LIMITATION OF LIABILITY. Seller will not be liable to the Buyer or any other person or entity for indirect special, incidental, consequential, punitive, or exemplary damages in connection with this transaction or any acts or omissions associated therewith or relating to the sale or use of any goods, whether such claim is based on breach of warranty, contract, tort, or other legal theory and regardless of the causes of such loss or damages or whether any other remedy provided herein fails. In no event will the Seller’s total liability under this contract exceed an amount equal to the total amount paid for the goods purchased hereunder. WAIVER. In the event of any default under or breach of the contract by the Buyer, the Seller has the right to refuse to make further shipments. The Seller’s failure to enforce at any time or for any period of time the provisions of this contract will not constitute a waiver of such provisions or the right of the Seller to enforce each and every provision. GOVERNING LAW. The validity, construction, and performance of the contract and the transactions to which it relates will be governed by the laws of the United States of America. All actions, claims, or legal proceedings in any way pertaining to this contract will be commenced and maintained in the courts of Whitman County, State of Washington, and the parties hereto each agree to submit themselves to the jurisdiction of such court. SEVERABILITY. If any of the Terms and Conditions set out in this contact are declared to be invalid by a court, agency, commission, or other entity having jurisdiction over the interpretation and enforcement of this contract, the applications of such provisions to parties or circumstances other than those as to which it is held invalid or unenforceable will not be affected. Each term not so declared invalid or unenforceable will be valid and enforced to the fullest extent permitted by law and the rights and obligations of the parties will be construed and enforced as though a valid commercially reasonable term consistent with the undertaking of the parties under the order has been substituted in place of the invalid provision. SET-OFF. The Buyer may not set-off any amount owing from the Seller to the Buyer against any amount payable by the Buyer to the Seller whether or not related to this contract 16 5TE REFERENCES Hilhorst MA. 2000. A pore water conductivity sensor. Soil Sci Soc Am J. 64(6): 1922–1925. Topp GC, David JL, and Annan AP. 1980. Electromagnetic, Determination of Soil Water Content: Measurement in Coaxial Transmission Lines. Water Resour Res 16(3): 574–582. 17 INDEX INDEX A R accuracy 7 range 7 references 17 C cable length 8 calibration 12–13 cleaning 13 communication 6, 7 compliance 10 connecting METER data logger 5 non-METER logger 5–6 connector types 8 customer support 14 D data logger 4–6, 7 dielectric permittivity 7, 10, 12 E email 14 I installation 2 horizontal 3–4 vertical 3 integrator's guide 6 M S specifications 7–10 communication 7 data logger compatibility 7 electrical and timing 8–9 measurement 7 physical 8 T temperature 7, 8, 11 terms and conditions 15–17 theory 10–13 troubleshooting 13 V volumetric water content 7, 10 W wiring 5–6 Z ZENTRA ZENTRA Cloud 5 ZENTRA Utility 5 measurements 7–9 mineral soil calibration 12 O orientation 4 P particle size 2 power requirements 8 18 14563-01 4.9.2018 METER Group, Inc. USA 2365 NE Hopkins Court Pullman, WA 99163 T: +1.509.332.5600 F: +1.509.332.5158 E: info@metergroup.com W: metergroup.com © 2013, 2018 All Rights Reserved.
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