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Contents
On these operating instructions ................................................................................................................................2
Introduction ............................................................................................................................................................2
Description ..........................................................................................................................................................2
.
Oxygen diffusion rate ................................................................................................................................2
.2
ODR meter ................................................................................................................................................3
.3
Pt-electrode ...............................................................................................................................................3
.3. Preparation ...........................................................................................................................................3
.3.2 Maintenance ........................................................................................................................................4
.4
Reference electrode ...................................................................................................................................4
.4. Commercial electrodes .........................................................................................................................4
.4.2 Preparation for use ...............................................................................................................................4
.4.3 Maintenance ........................................................................................................................................4
.4.4 Storage ................................................................................................................................................4
.4.5 Preparation of a used electrode ............................................................................................................5
.4.5. Before (re-)generating, the electrode must be cleaned ..................................................................5
.4.5.2 Generating an Ag-AgCl electrode .................................................................................................5
.5
Brass electrode ..........................................................................................................................................5
.5. Maintenance ........................................................................................................................................5
2 Measurements .....................................................................................................................................................6
2.
Measurement of Redox ..............................................................................................................................6
2.2
Measurement of ODR ................................................................................................................................6
2.3
Checking the instrument ...........................................................................................................................7
3 Storage, transport ................................................................................................................................................8
4 Specifications .......................................................................................................................................................8
............................................................................................................................................................9
..........................................................................................................................................................0
All it takes for
P.O. Box 4, 6987 ZG Giesbeek,
the Netherlands
© December 2008
Oxygen diffusiOn meter
OperAting instructiOns
environmental
T
+3 33 88 02 00
F
+3 33 88 02 99
research
E
info@eijkelkamp.com
I
www.eijkelkamp.com
M.4.36.E
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Related Manuals for EIJKELKAMP 14.36
Summary of Contents for EIJKELKAMP 14.36
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Page 1: Table Of Contents
3 Storage, transport ..............................8 4 Specifications ...............................8 Literature ................................9 Figures ................................0 All it takes for environmental research +3 33 88 02 00 info@eijkelkamp.com P.O. Box 4, 6987 ZG Giesbeek, +3 33 88 02 99 www.eijkelkamp.com the Netherlands M.4.36.E © December 2008... -
Page 2: On These Operating Instructions
On these operating instructions If the text follows a mark (as shown on the left), this means that an important instruction fol- lows. If the text follows a mark (as shown on the left), this means that an important warning fol- lows relating to danger to the user or damage to the apparatus.The user is always responsible for its own personal protection. Text Italic indicated text indicates that the text concerned appears in writing on the display(or must be typed). Introduction The oxygen diffusion rate (ODR) meter measures the mobility of oxygen in the soil. This mobility is of significance to the availability of oxygen to the plant roots. The method involves the measurement of the electric current nee- ded for the reduction of all available oxygen at the surface of a cylindrical Pt-electrode in the soil. Thus the oxygen flux through the air-filled pores and the waterfilm on the electrode to a zero concentration at the electrode surface is measured. -
Page 3: Odr Meter
The reduction of one mole of oxygen thus requires four mole electrons which is equivalent to a charge of 4 x 96500 = 386000 Coulombs. If ODR is the reduction rate of oxygen expressed in grams per second per square meter, this can be done as fol- lows: i x 32 ODR = —————... -
Page 4: Maintenance
Drill a hole to the desired depth minus 0 mm and insert the electrode-rod into the hole. Exert a slight pressure on the top of the assembly to bring the electrode to its correct position. Take care not to damage the electrode. ... -
Page 5: Preparation Of A Used Electrode
Preparation of a used electrode The standard reference electrodes are supplied with a AgCl coating by Eijkelkamp. When the AgCl-coating is visu- ally damaged or weared after use it must be renewed. The “old” AgCl coating must be removed totally and the electrode must be cleaned. -
Page 6: Measurements
Measurements Check that the switch on the read-out unit is in the “OFF” position. Connect the signal cables from one, two or three Pt-electrodes to the BNC input connectors on the read-out unit, numbered 1, 2 and 3, as appropriate. Pre- pare a place in the soil for the reference electrode and the brass electrode. -
Page 7: Checking The Instrument
Warning: The table is established using data from the Zobell-solution supplier (in Italics) and from the Austrian and DIN standard. Missing but usefull data have been extrapolated and are marked with *. Use the grey marked column for the 3 M KCl electrodes supplied by Eijkelkamp. -
Page 8: Storage, Transport
Temp Ag/AgCl Ag/AgCl Ag/AgCl Ag/AgCl Calomel Standard Eref compared °C saturated (4M KCl) (3M KCl) M KCl hydrogen to Ag/AgCl (3M KCl) 270 mV 234.2 263.5 258* 226.0 482* 224* 25* 27.8 472* 22* 250.5 209.6 20.4 237.5 93.2 85.0 224.5 76.8 68.6 2.5... -
Page 9: Literature
Power: Four penlite (IEC-LR6) batteries; consumption 7.5 mA. Low battery-voltage level is indicated in the upper left corner of the display by a battery symbol. Battery replacement: Batteries can be reached through the lid at the bottom of the back of the read-out unit. Mind the polarity when replacing batteries. -
Page 10: Figures
Figure 1. Schematic diagram... - Page 11 Eijkelkamp Agrisearch Equipment. Technical data can be amended without prior notification. Eijkelkamp Agrisearch Equipment is not responsible for (personal damage due to (improper) use of the product. Eijkelkamp Agrisearch Equipment is interested in your reactions and remarks about its products and operating instructions.
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