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1. Temperature response of soil matric potential readings The effect of temperature on the EQ3 soil matric potential readings in any particular soil will depend on a combination of effects The EQ3 soil moisture electronic circuit has a very low temperature sensitivity and so this makes a negligible contribution to the overall sensitivity The refractive index of water reduces as the temperature increases This produces a negative temperature response as a result of the water contained in the porous material the equilibrium body of the EQ3 Note ice has a quite different refractive index from water so EQ3 soil matric potential readings cannot be interpreted reliably when inserted into soil below 0 EQ3 User Manual 1 1 Technical Reference 27 Electromagnetic Compatibility EMC General information EQ3 is a Class A product intended for operation in non residential environments Only use cables and accessories authorised by Delta T sensor cables from other sources for example may adversely affect product performance and affect quality of results If possible route cables along the soil surface or bury them this also reduces possible trip hazard and animal damage Do not modify the product or its supplied accessories The ML3 EMC Guidance on the Software and Manuals DVD Issue 3 provides additional relevant information Regulatory information Europe This device conforms to the essential requirements of the EMC
2. Voltage Excited You need to know the excitation voltage Vref reference resistance Rref The correct resistance is given by the equation R a0 ai Rmeas Where a0 Ic Rc Rref Vref al 1 lIc Rc Vref Ic 18 mA EQ3 sensor supply current For Delta T EXT 5W xx series cables Re 0 066 Q m For the SMSC Iw 05 5m logger cable Re 0 33 Q Current Excited You need to know the excitation current lex The corrected resistance is given by the equation using terms defined above R Rmeas Ic Rc lex EQ3 User Manual 1 1 Appendix 1 e 34 Resistance to Temperature Lookup Table degreesC Koh Poa pee tae EQ3 Resistance to Temperature Conversion Chart 16 sm A Set CTR Qi er mn Tl 37 759 pC 1 28 844 O 5 2m g 196 13 606 12 098 10 780 26 9 623 8 611 32 7 720 6 935 6 241 a ER j 2 593 Note This table has been optimised for use as a look up table To minimise linear interpolation errors the data points fall either side of the manufacturer s specified sensor response curve This helps optimise the overall accuracy of readings EQ3 User Manual 1 1 Appendix 1 35 Index A Accuracy saturation errors 7 Auger 10 C Cable connections 12 Cable length correction 36 Calibration check 28 sensor 24 Care and Safety 10 Certification emc 31 Connections 15 Copyright 2 D Data logger 21 26 DL2e 26 DL6 26 GP1 19 26 other da
3. calibration is required the probe will need to be returned to Delta T Devices No other maintenance is required EQ3 User Manual 1 1 Troubleshooting 25 Technical Reference Specifications Matric Potential 10kPa over O to 100kPa Accuracy 5 of reading over 100 to 1000kPa eee Not detectable if the change of matric potential is y slower than 0 1kPa min Soil Types Suitable for all non saline soil types 0 1V differential non linear Calibration data and Output Signal graph supplied with each sensor Output compatible with GP1 GP2 DL6 DL2e HH2 Temperature EQ3 must be fully buried to accurately measure soil temperature Output compatible with GP1 GP2 DL6 DL2e HH2 Cabling error contribution Negligible for GP1 GP2 amp DL6 any cable length to temperature readings Negligible for DL2e with 5m cable 100m GP1 GP2 amp DL6 data loggers 100m DL2e water content measurement 25m DL2e temperature measurement Dimensions ei Sensor accuracy 0 5 C over 0 40 C not including logger or cabling error Maximum cable length 4 Note The DL6 has only one temperature channel The DL6 error contribution to EQ3 temperature measurement is negligible compared to the accuracy of the EQ3 temperature sensor itself The two only become comparable below 15C 5 DL2e Logger users can apply a correction in the Ls2Win logging software for cable lengths gt 5m EQ3 User Manual 1 1 Technical Reference 26
4. DL2e Check versions Check you have the correct versions HH2 Meter Firmware version 2 7 1 and PC software HH2Read version 2 7 or later are recommended GP1 GP2 amp DL6 Loggers DeltaLINK version 3 0 or later is required DL2e Logger Ls2Win 1 0 SR10 is required Consult the user manuals or the on line help for these devices and their related software Try alternative types of equipment if you have them available The EQ3 itself Try to isolate the problem into one of the following areas The EQ3 or the connecting cable Then try to narrow down the area further Mechanical problems faults or damage Electrical or electronic problems or faults EQ3 User Manual 1 1 Troubleshooting 24 Maintenance and functional check Large concentrations of Sodium ions may affect the calibration curves If the equilibrium body becomes contaminated the sodium may be washed out by repeatedly wetting it in de ionised water and then drying it out by inserting it into a dry non saline soil Washing and then drying in air does not help because in that case no exchange of water or solute can take place The following simple check can be used to establish whether your EQ3 is functioning within expected bounds The calibration should be stable for 2 years It can be checked by putting the probe into de ionised water and checking the reading against the 0 kPa value in its calibration table at 20 C the reading should be within 20 mV If re
5. directive 2004 108 EC based on the following test standards EN61326 1 2006 Electrical requirement for measurement control and laboratory use EMC requirements Group 1 Class A equipment emissions section only EN61326 1 2006 Electrical requirement for measurement control and laboratory use EMC requirements Basic Immunity immunity section only FCC compliance USA This device conforms to Part 18 of FCC rules Industrial Scientific amp Medical Equipment Note with reference to FCC Part 18 115 Elimination and investigation of harmful interference a The operator of the ISM equipment that causes harmful interference to radio services shall promptly take appropriate measures to correct the problem EQ3 User Manual 1 1 Technical Reference 28 Definitions Soil Matric Potential Studies of plant growth need to characterise the availability of water to the plant and this is usually done using the water potential P which measures the suction necessary to extract water from the soil and has units of pressure kPa Componenis of this water potential are contributed by gravity atmospheric pressure osmosis and the capillary action of the soil particles This last component called the Soil Matric Potential is highly dependent on the wetness of the soil and varies from 0 kPa at field capacity down to approximately 1500 kPa at the permanent wilting point Soil Water Content versus Soil matric potenti
6. 1 Operation 19 Operational considerations Hysteresis and response time effects The EQ3 only reads correctly once the equilibrium state within the probe is reached with the surrounding soil Normally there is a time lag between the change of matric potential of the surrounding soil and the response of the EQ3 due to the quality of the hydraulic connection between the EQ3 and soil This time lag is greatest when the soil matric potential is changing fast and at large negative matric potentials see Table 1 Under natural conditions changes in matric potential are normally less than 0 01 RPa min so the associated errors will therefore be much lower than the values in Table 1 Table 1 Response time of the EQ3 in a rapid drying test The values are much higher than under natural conditions Matric potential Errors in kPa after minutes absolute changes kPa kPa min 60 120 180 300 360 Soil properties and salinity The EQ3 is unaffected or damaged by physical soil properties organic matter stones bulk density and most chemical soil properties e g pH No tests have been carried out in saline soils so the performance of the EQ3 in saline soils is unknown EQ3 User Manual 1 1 Operation e 20 HH2 Meter You need version 2 7 or later of the PC software HH2Read and version 2 7 1 of the HH2 firmware E 7 BE DELTA T DEVICES CAMBRIDGE ENGLAND Connect the EQ3 to the HH2 meter Press Esc to turn t
7. Matric Signal LO black CH1 Thermistor HI grey CH2 and CH2 Cable shield green CH1 PGND With DeltaLINK configured to talk to a GP2 in the Program Overview panel define an EQ2x sensor type measurement for the EQ3 matric potential signal In the Properties Calculation panel enter the unique look up table supplied with your EQ3 to convert mV to kPa See also Fig 1 on page 15 and page 22 Define an ML3 temperature measurement channel for the EQ3 s soil temperature sensor See also page33 For further configuration details and help see the DeltaLINK 3 software online Help for GP2 loggers the EQ2 Equitensiometer Info Panel Help and the GP2 User Manual 1 The GP2 logger needs the PC logger software DeltaLINK 3 This can be obtained from www delta t co uk or the Software and Manuals DVD EQ3 User Manual 1 1 Operation e 14 1 Click to add new sensor and select EQ2x 2 Enter EQ3 table GP2 Simulator Delta File Edit View Help Ba Logger amp Sensors Dataset Program Program Empty GP2 program v Measurements Sensor type Channel Result u fib Power Built in Internal V 6 N Psi EQ2x CH1 kPa CE SoilTemp ML3 temperature CH2 deg C dick to add a new item v Recordings Rate Options Measure Individual De fault ih Power F Info Panel EQ2 Equitensiometer 7 gt EC in Y Apply Help General A Sensor type EQ2x Measurement name Psi Input A Channel CH1 Signal groun
8. User Manual for the EQ3 Equitensiometer Soil Matric Potential Sensor EQ3 UM 1 1 Delta T Devices Ltd AT Notices Patents The EQ3 Equitensiometer has been jointly developed by Dr Liu Ecomatik and Delta T Devices Ltd and uses novel technologies They are subject to the following patents UK GB2300485B US US5804976 amp US5898310 Copyright All parts of the EQ3 design and documentation are covered under copyright law All rights reserved Under the copyright laws this book may not be copied in whole or in part without the written consent of Delta T Devices Ltd Under the law copying includes translation into another language 2014 Delta T Devices Ltd EMC Compliance See page 28 Design Changes Delta T Devices Ltd reserves the right to change the designs and specifications of its products at any time without prior notice User Manual Version EQ3 UM 1 1 October 2014 Delta T Devices Ltd 130 Low Road Burwell Tel 44 1638 742922 Fax 44 1638 743155 Cambridge CB25 0EJ email sales delta t co uk web www delta t co uk UK Contents Introduction Description Features Behaviour near saturation Dimensions Parts list Care and safety How the EQ3 works Operation Cable Connections Installation Delta T Logger connections and configuration GP2 GP1 DL6 DL2e Other data loggers Logging period and sensor warmup time Operational considerations HH2 Meter Calibration Sens
9. al The relationship between soil matric potential and soil water content is called the soil water release curve it seems to have about 5 other names as well It differs enormously from one soil to another particularly from clay soils at one extreme to sandy soils at the other There is no generalised method of converting from soil water content to matric potential though a number of expressions have been found which have been successfully applied to a restricted list of soil types see for example references 2 and 3 EQ3 User Manual 1 1 Technical Reference 29 References 1 Gaskin G J and Miller J D 1996 Measurement of soil water content using a simplified impedance measuring technique J Agr Engng Res 63 153 160 2 Campbell G S 1974 A simple method for determining unsaturated conductivity from moisture retention data Soil Sci 117 311 314 3 van Genuchten M Th 1980 A closed form equation for predicting the hydraulic conductivity of unsaturated soils Soil Sci Soc Am J 44 892 898 EQ3 User Manual 1 1 References 30 Technical Support Terms and Conditions of Sale Our Conditions of Sale ref COND 06 14 set out Delta T s legal obligations on these matters The following paragraphs summarise Delta T s position but reference should always be made to the exact terms of our Conditions of Sale which will prevail over the following explanation Delta T warrants that the goods will be free from defects
10. arising out of the materials used or poor workmanship for a period of twenty four months from the date of delivery Delta T shall be under no liability in respect of any defect arising from fair wear and tear and the warranty does not cover damage through misuse or inexpert servicing or other circumstances beyond their control If the buyer experiences problems with the goods they shall notify Delta T or Delta T s local distributor as soon as they become aware of such problem Delta T may rectify the problem by replacing faulty parts free of charge or by repairing the goods free of charge at Delta T s premises in the UK during the warranty period If Delta T requires that goods under warranty be returned to them from overseas for repair Delta T shall not be liable for the cost of carriage or for customs clearance in respect of such goods However Delta T requires that such returns are discussed with them in advance and may at their discretion waive these charges Delta T shall not be liable to supply products free of charge or repair any goods where the products or goods in question have been discontinued or have become obsolete although Delta T will endeavour to remedy the buyer s problem Delta T shall not be liable to the buyer for any consequential loss damage or compensation whatsoever whether caused by the negligence of the Delta T their employees or distributors or otherwise which arise from the supply of the goods an
11. d or services or their use or resale by the buyer Delta T shall not be liable to the buyer by reason of any delay or failure to perform their obligations in relation to the goods and or services if the delay or failure was due to any cause beyond the Delta T s reasonable control EQ3 User Manual 1 1 Technical Support e 31 Service Repairs and Spares Users in countries that have a Delta T distributor or technical representative should contact them in the first instance Spare parts for our own instruments can be supplied and can normally be despatched within a few working days of receiving an order Spare parts and accessories for products not manufactured by Delta T may have to be obtained from our supplier and a certain amount of additional delay is inevitable No goods or equipment should be returned to Delta T without first obtaining the return authorisation from Delta T or our distributor On receipt of the goods at Delta T you will be given a reference number Always refer to this reference number in any subsequent correspondence The goods will be inspected and you will be informed of the likely cost and delay We normally expect to complete repairs within one or two weeks of receiving the equipment However if the equipment has to be forwarded to our original supplier for specialist repairs or recalibration additional delays of a few weeks may be expected For contact details see below Technical Support Users in coun
12. d termir CH1 Minimum power volt 5 1 Power channel PWR on Bank A Calculation A Table Sayers EQ3 Table sensor 1 Result Input Units DESCRIPTION Result Units Sensor type EQ2 Table Linearization Table Measures soil matric potential that is the negative pr Lookup up table for convertio my a kPa extract water from between the matrix of soil partides Press F1 or dick HELP for mor Equitensiometer b 459 6 200 ls Ll 492 7 10 4 w Ll 504 5 0 Connection Details GP2 Simulator Any logger on GP2Simul Paste Save Cancel Figure 1 Illustration showing the creation in DeltaLINK of a GP2 logger channel for the EQ3 by selecting an EQ2x sensor type measurement and inputting the unique look up table provided with each equitensiometer Note also the EQ3 temperature measurement channel created by defining it as a soil temperature measurement with an ML3 temperature sensor type EQ3 User Manual 1 1 Operation 15 GP1 Two EQ3s can connect to each GP1 Each EQ3 is wired as a differential powered sensor These details illustrate connection to Channels 1 and 3 EQ3 wiring Colour GP1 terminal Power OV and Sion CH1 GND Thermistor LO or Temp GND Power V white CH1 PWR Matric Potential Signal HI blue CH1 Matric Potential Signal LO black CH1 Temperature grey Temp3 IN Cable shield green CH1 GND Use the linearization data provided with the EQ3 to create a linea
13. he equilibrium body surrounding the rods dominates its permittivity A measure of a material s response to polarisation in an electromagnetic field Water has a permittivity 81 and air 1 The permittivity of the porous material has a strong influence on the applied field which is detected by the EQ3 resulting in a stable voltage output that acts as a simple sensitive measure of soil matric potential EQ3 User Manual 1 1 Introduction 10 Operation Cable Connections Power OV white Power V blue Soil Moisture Signal HI black Soil Moisture Signal LO grey Temperature Cable shield HH2 Extension Logger cable cables cables Sm 5m with 0 9m 100 or 200 10m mm bare 25m leads Take care when attaching cables to ensure that the connectors are clean undamaged and properly aligned before pushing the parts together screw together firmly to ensure the connection is water tight Extension cables can be joined up to a recommended maximum of 100m see Specifications on page 26 EQ3 User Manual 1 1 Operation e 11 Installation Sensor preparation and siting The EQ3 should be thoroughly wetted before use and installed at a horizontal or slanting angle Vertical installation may slow the response time and also lead to incorrect readings because rainfall running down the side of the probe housing may wet the soil around the probe excessively This is particularly imp
14. he meter on and if necessary press again until the HH2 displays the start up screen Set the meter to read from an EQ2 or EQ2 3 from version 2 7 1 Press Set and scroll down to the Device option Press Set again and scroll down to select EQ2 or EQ2 3 Press Set to confirm this choice Press to take a reading Press to save or Esc to discard En the reading If you have saved data connect your HH2 to a PC and run HH2Read to retrieve the readings Note the HH2 does not display or store EQ3 temperature readings The HH2 does not display EQ3 matric potential readings in kPa but only records the output in mV To convert the reading to kPa requires use of the look up table provided with the EQ3 Go to www delta t co uk for the latest updates EQ3 User Manual 1 1 Operation e 21 Calibration Sensor calibration Each EQ3 is individually calibrated to provide consistent dielectric performance and is supplied with the following calibration document EQ3 interpolation of calibration values for data logger linearization tables calibration values assupplied Matric Potential kPa Output mV 492 E o E 376 6 40 7 EQ3 User Manual 1 1 Serial No EQ3 2009 stepsize kPa step size kPa SE EE ne an interpolated table interpolated table WET range FULL range Matric Potential ge Matric Potential mV
15. is can be converted into the matric potential of the surrounding soil using the calibration curve supplied with each Equitensiometer EQ3 User Manual 1 1 Introduction 5 Features Soil matric potential accurate to 10kPa from 0 to 100kPa A 10 of reading from 100kPato 1000kPa f Hysteresis may add 20kPa at OkPa see Behaviour near saturation below Soil temperature to 0 5 C over 0 40 C Excellent stability itensiomete Minimal soil disturbance Probe El Easy installation at depth in augered holes Waterproof connector to IP68 8 Rugged vveatherproof and can be buried Good electrical immunity Choice of cabling system options Cable connector cylindrical profile and extension tube design simplifies removal for servicing See also Specifications on page 26 Behaviour near saturation EQ3 sensors are best used in non saturated direr soils best for measurements from 100 to 500 kPa Our own experience over the years is that the zero readings saturated conditions are not well defined and the curve changes rapidly meaning that for a very small kPa shift in the soil you get a very large mV shift from the sensor Our own view derived from user s experience over a number of years is that offset errors at saturation due to drift or hysteresis in the zero potential mV value are commonly of the of the order of 20mV or more The EQ3 in other respects seems to continue to behave in a normal fa
16. kPa mV C O 0000 a a ae many EE aa 27g i EN A 2409 mm Es A CS gt S 335 1 60 ha 2893 80 mm x 9i nn fi a re EE 2597 S a N O 2480 amma 140 2421 iO o 2390 W S me ey gt 180 E M 190 e a SE 220 lin 18 9 Sm 230 A 240 a eee 250 ae Aine 260 V ie 208 eer C280 290 200 4 300 Pw 198 4310 _ E 196 4 320 Operation 22 Wet range par 400 0 __ 600 0 100 Matric Potential kPa polynomial curve fit Matric Potential kPa LI S 300 6 Fi os 9 o 6 9 6 i y 9 45699E 12x 1 93873E 8x5 16 08561E 6x 68 61793E 4x 1 56674E 0x 1 71 23309E 2 400 EQ3 output nn aa Full di ojo 100 0 200 0 ge ha 4 a 500 0 600 0 100 200 300 b Matric Potential kPa 400 Matric Potential kPa 500 600 700 EQ3 output mV EQ3 User Manual 1 1 Operation e 23 Troubleshooting Always try to identify which part of the measurement system is the source of the difficulty For the EQ3 this may fall into one of the following areas The measurement device What equipment is being used to read the probe output A Delta T HH2 Moisture Meter Note the HH2 does not measure EQ3 temperature and can only read the matric potential output in mV A Delta T data logger such as the GP1 GP2 DL6 or
17. or calibration Troubleshooting Technical Reference Specifications Matric Potential Temperature EQ3 User Manual 1 1 Introduction b CoO CO N O Oa OI 11 11 12 14 14 16 17 18 19 19 20 21 22 22 24 26 26 26 26 e 3 Definitions 29 Soil Matric Potential 29 Soil Water Content versus Soil matric potential 29 References 30 Technical Support 31 Appendix 1 33 The EQ3 Temperature Sensor 33 Resistance to Temperature Lookup Table 35 Index 36 EQ3 User Manual 1 1 Introduction 4 Introduction Description The EQ3 Equitensiometer EQ3 measures soil matric potential and temperature Soil matric potential is the negative pressure or suction required to extract water from between the matrix of soil particles It is an important indication of plant water stress The value of soil matric potential measured depends mainly on the quantity of water present and the make up of the soil though it is also affected by temperature and salinity The EQ3 consists of a precision soil moisture sensor the ML3 ThetaProbe whose measuring rods are embedded in a porous material the equilibrium body This material has a known stable relationship between water content and matric potential When the probe is inserted into the soil the matric potential within the equilibrium body equilibrates to that of the Surrounding soils The water content of the matric material is measured directly by the ML3 ThetaProbe and th
18. ortant if the probe is being installed below the soil surface using a probe extension tube Any gaps between the EQ3 and soil should be filled with a quartz powder slurry Small changes to the soil structure surrounding the probe will not affect readings but it may take a couple of wetting and drying cycles of the soil around the EQ3 before the signal stabilises Protect the EQ3 from strong temperature fluctuations and in particular to avoid exposing the electronics and equilibrium body to different temperatures So avoid installing it with the case exposed to strong sunlight Protect the cable before burying it in locations where it may be attacked by soil insects etc Soil sampling points The soil matric potential within a region of soil will be affected by local variations in soil density and composition rates of percolation runoff evaporation and the uptake of water by nearby roots The resultant differences in pressure will equilibrate over time at a rate which is determined by the local hydraulic conductivity It is important to take the degree of variability of these various parameters into account when deciding on the number of probes to use at any particular location In particular if the soil is known to be very heterogeneous or the distribution of roots is very non uniform it will be necessary to take measurements from at least three closely spaced locations EQ3 User Manual 1 1 Operation e 12 Push the EQ3 into the soil
19. rization file for DeltaLINK formatted as a TBL file as described in Using Linearization table files with DeltaLINk available in the DeltaLINK Documents Library folder installed on your PC or on the Software and Manuals DVD Save the TBL file to the DeltaLINK Installation folder Using the DeltaLINK logger software configure channel 1 or 2 as a custom voltage sensor and in the sensor s Input Channel Properties Linearization table field select your table from the drop down menu Configure channel 3 or 4 as an ML3 temperature sensor See also GP1 Quick Start Guide and the DeltaLINK on line Help The GP1 needs the PC logger software DeltaLINK version 3 or later A free upgrade can be obtained from www delta t co uk or from the Software and Manuals DVD EQ3 User Manual 1 1 Operation 16 DL6 6 EQ3s can be connected to a DL6 Each EQ3 is wired as a differential powered sensor A DL6 logger can only read one EQ3 temperature sensor These details illustrate connection to channels 6 and 7 EQ3 wiring Colour DL6 terminal Power OV brown OV Power V white V Soil Moisture Signal HI blue ue Soil Moisture Signal LO les IN Temperature grey RES IN Cable shield green 7777 Use the linearization data provided with each EQ3 to create a unique linearization file for DeltaLINK formatted as a TBL file as described in Using Linearization table files with DeltaLINk available in the DeltaLINK Documents Librar
20. shion so we don t think it is a malfunction rather it is a feature of the sensor EQ3 User Manual 1 1 Introduction 6 Dimensions Signal cable connector IP68 M12 5 pin Extension tube Connector 12 x BSP thread WW T8T WW O 40 5 mm EQ3 User Manual 1 1 Introduction 7 Parts list Your shipment may include the following em moon errer m ML EX50 50 and 100cm Extension il ML EX100 Tube 5m cable with SMSC sw 100 mm flying leads 05 for GP2 GP1 or DL6 logger 5m cable with 200mm SMSC Iw 05 flying leads for DL2e logger EXT 5W 05 5 10 and 25m extension EXT 5W 10 cables IP68 M12 EXT 5W 25 connectors SMSC d 0 9m cable connects to HH2 HH2 Meter via 25 way D connector 45mm spiral auger 1 2m long EQ3 User Manual 1 1 Introduction 8 Care and safety Take care when attaching cables to ensure that the connectors are clean undamaged and properly aligned before pushing the parts together Do not pull the EQ3 out of the soil by its cable Keep the EQ3 in its protective tube when not in use EQ3 User Manual 1 1 Introduction 9 How the EQ3 works Vout When power is applied to the EQ3 It creates a 100MHz waveform similar to FM radio The waveform is applied to an array of stainless steel rods which transmit an electromagnetic field into a porous material the equilibrium body The water content of the porous material t
21. should be used as this performs the supply current correction DL2e Logger The linearization table for the S3T sensor code ML3 Temperature provides supply current correction for the SMSC Iw 05 5m logger cable ONLY Extension cables and other cable lengths Create your own custom sensor type s and linearization tables as described in Ls2VVin Help topic How to Add or modify a sensor type in the sensor library Enter corrected resistance values R for each linearization table point R R5 0 059 x Lex RO See footnote or R R5 0 9 x Re 0 297 RO 7 Note This equation only applies to Delta T ML3 cables EQ3 User Manual 1 1 Appendix 1 e 33 where R5 value supplied in the table for the ML3 Temp 5m sensor type Lex length of extension cable excluding the 5m of SMSC Iw 05 cable Rc total cable resistance including resistance of SMSC Iw 05 cable if fitted Other loggers If your logger can be programmed so that the soil matric potential and temperature readings can be taken sequentially i e the sensor is not powered during the temperature reading then the temperature can be obtained directly from the response curve on page 35 Otherwise correct the resistance reading before applying the response curve You need to know the resistance of the Power OV wire in the EQ3 cable Rc and establish whether your logger uses voltage or current excitation for resistance measurement
22. ta loggers 21 Definitions 32 Description 6 Dielectric performance 24 Dimensions 8 DL6 18 EMC 31 Extension cables 12 EQ3 User Manual 1 1 F FCC compliance 31 Features G GP1 17 19 26 GP2 15 H HH2 9 23 26 I Installation buried 14 M Matric potential 11 29 32 Meter 26 ML3 6 15 17 19 31 36 37 p Parts 9 Permittivity 11 References 33 Regulatory information 31 Rods 11 Index 36 S Temperature cable length correction 21 36 Sales code 9 Temperature response of soil moisture saturation 7 readings 30 Servicing 35 Temperature sensor cable length SMSC Iw 05 36 correction 37 Soil matric potential 32 Temperature Sensor Lookup Table 39 Soil water content 32 Troubleshooting 26 Soil water release curve 32 ty 15 Specifications 2 29 W T Warning Technical support 34 35 Care and Safety 10 EQ3 User Manual 1 1 Index 37
23. tries that have a Delta T distributor or technical representative should contact them in the first instance Technical Support is available on Delta T products and systems Your initial enquiry will be acknowledged immediately with a reference number Make sure to quote the reference number subsequently so that we can easily trace any earlier correspondence In your enquiry always quote instrument serial numbers software version numbers and the approximate date and source of purchase where these are relevant Contact details Technical Support Tel 44 1638 742922 Delta T Devices Ltd I 130 Low Road Fax 44 1638 743155 Burwell E mail tech support delta t co uk Cambridge CB25 0EJ sales delta t co uk England UK Web www delta t co uk EQ3 User Manual 1 1 Technical Support e 32 Appendix 1 The EQ3 Temperature Sensor EQ3 Temperature Measurement The EQ3 Temperature sensor uses the same thermistor as that used in the ML3 ThetaProbe which has a 10K resistance at 25 C However A This sensor has a different response curve from the more widely used 10K3A1B type The response curve is given in the Resistance to Temperature Lookup Table on page 35 B The Thermistor circuit shares the Power OV wire If the thermistor is measured when the EQ3 is powered the measured resistance measurement may need to be corrected for 18 mA EQ3 supply current GP2 GP1 and DL6 Loggers The ML3 temperature sensor type in DeltaLINK 3
24. until fully inserted Ensure good soil contact Note The EQ3 is not suitable for soil surface temperature measurements For soil temperature near the surface dig a trench and install horizontally as shown below Cover both EQ3 and the first 30cm of cable with at least 5cm of soil Installing at depth Make a 45mm diameter hole preferably at gt 10 to the vertical using the SM AUG 100 auger Connect an extension tube e g ML EX50 Push the EQ3 into the soil until fully inserted Ensure good soil contact using a quartz powder suspension to help avoid gaps between the sensor and the surrounding soil Delta T sales item QP1 Alternatively Dig a trench and install horizontally Frost The Equitensiometer will withstand frosts but any readings taken when the water inside the probe is frozen will be meaningless The EQ3 temperature sensor can help identify these events See also The EQ3 Temperature Sensor on page 33 EQ3 User Manual 1 1 Operation 13 Delta T Logger connections and configuration GP2 6 EQ3s can connect to each GP2 wired as a differential powered sensors 12 EQ3s can be connected if you do not use the temperature sensor For this you will also need a 5 gland expansion lid GP2 G5 LID These details illustrate connection to Channels 1 and 2 EQ3 wiring Colour GP2 terminal Power OV and Thermistor LO brown CH1 PGND Power V white CH1 PWR Soil Matric Signal HI blue CH1 Soil
25. wet end only 0 to 350kPa You will need to enter the individual linearization table values attached to the calibration data that is supplied with each of your EQ3s See the DL2e User Manual and the Ls2Win online help EQ3 User Manual 1 1 Operation 18 Other data loggers The EQ3 should be connected as a differential powered sensor Configure the logger to convert the EQ3 readings from millivolts into soil matric potential units by using the unique linearization tables or polynomial supplied on the data sheets with each sensor See the example on page 22 Output signals in the range 0 to 1 0 volts from the EQ3 correspond to a range of soil matric potential of 0 to 1000kPa The temperature sensor output should be read as a resistance and the logger configured with a look up table to covert the measured resistance to temperature See EQ3 Temperature Measurement on page 33 and Resistance to Temperature Lookup Table on page 35 Note each Equitensiometer needs its own linearisation table Logging period and sensor warmup time For guidance on a suitable logging frequency it may be helpful to inspect the EQ3 response time table on page 20 If unsure try logging once every 20 minutes The logging frequency should be no faster than once per minute Use a one second warmup time It is recommended that the sensor is not powered continuously in order to prevent thermistor self heating affecting signal accuracy EQ3 User Manual 1
26. y folder installed on your PC or on the Software and Manuals DVD Save each TBL file to the DeltaLINK Installation folder Using the DeltaLINK logger software configure channel 1 to 6 as a custom voltage sensors and in each sensor s Input Channel Properties Linearization table field select your corresponding table from the menu Configure channel 7 as a type ML3 temperature sensor See also the DL6 Quick Start Guide and the DeltaLINK online Help 3 The DL6 needs the PC logger software DeltaLINK version 3 or later A free upgrade can be obtained from www delta t co uk or from the Software and Manuals DVD EQ3 User Manual 1 1 Operation e 17 DL2e Up to 60 EQ3s can be connected to a DL2e logger if not using the temperature sensor channel Up to 30 EQ3s can be connected if also reading the temperature sensor Each EQ3 is connected as a differential powered sensor These details illustrate connection to Channels 57 and 58 using a LAC1 input card configured in 15 channel mode and warm up channel 63 EQ3 wiring Colour DL2e terminal Power OV brown CH62 or 61 Power V white CH63 NO Soil Moisture Signal HI blue CH58 Soil Moisture Signal LO black CH58 Temperature grey CH57 and CH57 Cable shield green CH61 or 62 Two sensor configuration codes are supplied with the DL2e E2D is intended for linearizing the full range of EQ3 output 0 to 1000kPa and E2W which provides more resolution at the
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