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Table of Contents
Related Manuals for Delta-T EQ2
Summary of Contents for Delta-T EQ2
- Page 1 Equitensiometer SOIL MATRIC POTENTIAL SENSOR TYPE EQ2 USER MANUAL EQ2-UM-1.3...
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Page 2: Table Of Contents
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. -
Page 3: Introduction And Description
The water content of the matric material is measured directly by the ThetaProbe, and this can be converted into the matric potential of the surrounding soil using the calibration curve supplied with each Equitensiometer. Equilibrium body ThetaProbe Figure 1 Page EQ2-UM-1.3... -
Page 4: Installation
This will minimise water ingress into the extension tube. Frost The Equitensiometer will withstand frosts, but any readings taken when the water inside the probe is frozen will be meaningless. EQ2-UM-1.3 Page... -
Page 5: Connections
The braid screen should be connected to digital ground on the logger or other measuring unit. If not using Delta-T equipment, please refer to the manufacturer's instructions. If you simply want to log the probe voltage directly, it can be treated as a differential voltage source of range 0 - 1.5V DC, and the attached meter or logger should be configured... -
Page 6: Operational Considerations
Two sensor configuration codes are supplied with the DL2e: is intended for linearising the full range of EQ2 output (0 to -1000kPa), and 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. -
Page 7: Maintenance
0 kPa value in its calibration table - at 20°C the reading should be within ± 20 mV. If re-calibration is required the probe will need to be returned to Delta-T Devices. No other maintenance is required. -
Page 8: Specifications
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 sensor) Dimensions Diameter: 40 mm, Length: 210 mm. Cable length Standard: 5 m, Maximum: 100 m. EQ2-UM-1.3 Page... -
Page 9: Definitions
1. Gaskin, G.J., and J.D. Miller. 1996. Measurement of soil water content using a simplified impedance measuring technique. J. agric. 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 Page EQ2-UM-1.3... -
Page 10: Guarantee, Repairs And Service
Guarantee, repairs and service Our Conditions of Sale ref: COND/91/11 set out Delta-T's legal obligations on these matters. For your information the following paragraphs summarise Delta-T's position but reference should always be made to our Conditions of Sale which prevail over the following explanation. -
Page 11: Sample Calibration Data Sheet
Sample Calibration Data Sheet interpolation of calibration values for DL2e sensor tables calibration values serial No EQ2 9/1 values in the mV column step size step size (kPa) (kPa) used to calc. Interpolated tables original calibration table interpolated interpolated table table "as... - Page 12 -100 Matric Potential (kPa) polynomial curve fit -200 -300 y = -25.85E-12x + 46.55E-9x - 34.52E-6x + 13.50E-3x - 2.94E+0x + 338.57E+0x - 16.28E+3 -400 EQ2 output (mV) Full range 50.0 100.0 150.0 200.0 250.0 300.0 350.0 400.0 450.0 -100...