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Equitensiometer

SOIL MATRIC POTENTIAL SENSOR

TYPE EQ2

USER MANUAL

EQ2-UM-1.3

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Summary of Contents for EQ2

Page 1: ...Equitensiometer SOIL MATRIC POTENTIAL SENSOR TYPE EQ2 USER MANUAL EQ2 UM 1 3 ...

Page 2: ... and Delta T Devices and uses novel measurement techniques Patent application 19629745 1 Copyright Copyright 1999 Delta T Devices Ltd 128 Low Road Burwell Cambridge CB5 0EJ England 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 Delta T De...

Page 3: ...Equitensiometer consists of a precision soil moisture sensor the 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 rapidly equilibrates to that of the surrounding soils The water conte...

Page 4: ...riability 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 Extension tubes Optional extension tubes can be fitted to enable easier withdrawa...

Page 5: ... details are given in the relevant instrumentation User Manual Electromagnetic Compatibility EMC The Equitensiometer has been assessed for compatibility under the European Union EMC Directive 89 336 EEC and conforms to the appropriate standards provided the moisture measuring rods and probe body are completely immersed in the soil or other material being measured The cable connecting the Equitensi...

Page 6: ...ls section Two sensor configuration codes are supplied with the DL2e E2D is intended for linearising the full range of EQ2 output 0 to 1000kPa and E2W which provides more resolution at the wet end only 0 to 350kPa You will need to enter the individual linearisation table values attached to the calibration data that is supplied with each of your Equitensiometers DL3000 connection and configuration ...

Page 7: ...alues correct at 20 C For regions with strong temperature variations the following temperature correction should be applied ù ê ë é 4 20 _ _ C e temperatur mV value measured mV value Corrected The Equitensiometer will not be damaged by frost but its sensitivity to ice is very much less than water so any measurements taken below freezing will be meaningless Maintenance Large concentrations of Sodiu...

Page 8: ...1 kPa min Soil types Suitable for all non saline soil types Protection Electronics sealed to IP68 to 5m all exposed parts suitable for long term burial Temperature 0 to 40 C Not damaged by use in frozen soils but readings will be incorrect Power supply 5 to15 V DC 20 mA typical 1 s stabilisation Output signal approximately 150 to 550 mV non linear Calibration data and graph supplied with each sens...

Page 9: ... Water Content versus Soil Matric Potential 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 form 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 pote...

Page 10: ...e agree that the equipment does need to be returned we may at our discretion waive these charges SERVICE AND SPARES We recognise that some users of our instruments may not have easy access to technically specialised backup Spare parts for our own repairable instruments can be supplied from our works These can normally be despatched within 1 working day of receiving an order Spare parts and accesso...

Page 11: ... 0 420 0 0 420 0 0 411 10 411 0 10 374 0 50 402 20 402 0 20 305 0 100 383 40 392 5 30 198 0 150 365 60 383 0 40 170 0 200 346 80 374 0 50 161 0 250 305 100 365 0 60 152 0 300 198 150 355 5 70 146 0 350 170 200 346 0 80 140 0 400 152 300 336 5 90 138 0 450 140 400 305 0 100 136 0 500 132 600 283 6 110 134 0 550 129 1000 262 2 120 132 0 600 240 8 130 131 6 650 219 4 140 131 3 700 198 0 150 130 9 750...

Page 12: ... 350 0 400 0 450 0 EQ2 output mV Matric Potential kPa Matric Potential kPa Wet range y 25 85E 12x6 46 55E 9x5 34 52E 6x4 13 50E 3x3 2 94E 0x2 338 57E 0x 16 28E 3 400 300 200 100 0 0 0 50 0 100 0 150 0 200 0 250 0 300 0 350 0 400 0 450 0 EQ2 output mV Matric Potential kPa Matric Potential kPa polynomial curve fit ...

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