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11.
Notes
When using the Hood Infiltrometer IL- 2700, attention must be paid to the following:
Hoodinfiltrometer:
Before starting the experiment make sure that the reservoirs and connections are in-
tact.
Bring the apparatus in a level position. Align the scales against each other.
Moisten the quartz sand and press it gently. Add more sand while filling.
When filling, press gently on the hood.
Remember that ca. one column full of water will be required to fill the hood.
The hood must never be filled to the top. Mind the mark on the hood. By no means let
any water get into hoses [9] and [10]. If necessary, use the spare tube. No “complete”
drops must come up except for small droplets on the capillary wall.
Before starting the experiment, check the correct position of the valves. Only [V 1]
must be open.
Delete the data memory by pressing "ON" and "START".
To fill the hood, insert the air intake pipe into the bubble tower. Set the depth of sub-
mergence ca. 2 cm higher than the chamber height Hk. Until aeration, i.e. until the
beginning of infiltration, no bubbles must turn up in the infiltration reservoir [5]. Oth-
erwise do not forget to check that the system is tight.
Keep an eye on the water table of Us and Hs. Unless that level remains constant
throughout the test, air will enter through hose [9] or through the connected system.
Steady-state infiltration will be reached asymptotically and in dependence on the kind
of soil involved. As a guiding figure, a quasi steady-state value will have been reached
after infiltration of half a column of water.
Before setting another hydraulic pressure head by means of air intake pipe [7], fill up
the infiltration reservoir. In case this is necessary in the course of an infiltration meas-
urement, shut [V1] when filling.
Micrologger IL-2700:
Check the charge of the battery in the logger
Remove the batterys from the logger for longer measuring breaks
Avoid any tensile load on the data cable!
Содержание IL-2700
Страница 1: ...Manual Hood Infiltrometer IL 2700...