UGT IL-2700 User manual

Manual
Hood Infiltrometer
IL -2700

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Content
1. Introduction ......................................................................................................................... 3
1.1 Scope of supply ....................................................................................................................... 4
2. Introduction ......................................................................................................................... 6
3. Underlying theoretical principles........................................................................................... 7
4. Methodology of the experimetal procedure .......................................................................... 8
4.1 Infiltration tests with different water tensions....................................................................... 8
4.2 Infiltration tests with identical water tensions ....................................................................... 9
5. Technical Parameters, Set Up and Operation ...................................................................... 10
5.1 Technical Specifications......................................................................................................... 10
5.2 Assembly and operation of the Hood Infiltrometer.............................................................. 10
6. Test procedure.................................................................................................................... 12
6.1 Preparation of the Hood Infiltrometer.................................................................................. 12
6.2 Setting up the Hood Infiltrometer......................................................................................... 12
6.3 Filling the hood...................................................................................................................... 13
6.4 Choosing the effective water tension ................................................................................... 13
6.5 Measuring the infiltration rate.............................................................................................. 14
6.6 Bubble point (BP) of the soil.................................................................................................. 14
6.7 Soil Tensiometer.................................................................................................................... 15
7. Infiltration Measurement with the tension infiltrometer...................................................... 15
8. Calculation of hydraulic conductivity ................................................................................... 16
9. Micrologger IL-2700 ............................................................................................................ 17
9.1 Features................................................................................................................................. 17
9.2 Technical Data ....................................................................................................................... 17
9.3 General guidelines for operation .......................................................................................... 18
9.4 Measurement ........................................................................................................................ 19
9.5 Remarks for the configuration of a measurement ................................................................ 19
9.6 Calibration ............................................................................................................................. 20
9.7 Configuring the measurement interval /Starting a measurement........................................ 20
9.8 Options menu........................................................................................................................ 21
9.9 Menu structure...................................................................................................................... 21
10. Software IL2700 GUI........................................................................................................ 27
10.1 Reading out Data................................................................................................................... 28
11. Notes.............................................................................................................................. 31
12. References ...................................................................................................................... 32

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1. Introduction
Thank you for choosing the hood infiltrometer IL -2700. This manual can help you understand
the IL-2700 features.
The hood infiltrometer is designed to measure the hydraulic conductivity of soils in virtually
saturated areas in field studies. No additional contact layer nor preparation of the soil surface
is necessary on the measurement area. This does not only save labor time but also enables
the measuring of the infiltration and the conductivity under completely natural conditions in
a destruction-free manner. The effective increase in pressure on the soil surface can be freely
selected between zero and a vacuum up to the bubble point of the soil.
There are several ways to contact UGT if you need a quote or product information please
contact
Email: [email protected]
For any technical assistance or feedback or in case of problems with your product please con-
tact
Email: [email protected]
We look forward to your inquiries or questions and are with pleasure at your disposal.Phone:
+ 49 (0) 33432 –89 575
Fax:
+ 49 (0) 33432 –89 573
If contacting us by email or fax, please include as part of your message your instrument serial
number, your name, address, phone, and a description of your problem or question.
Please read these instructions before operating your hood infiltrometer to ensure that it per-
forms to its full potential.

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1.1 Scope of supply
Infiltration vessel with scale for manual level recording
1
and pressure sensor for electronic level recording
*
Handheld instrument IL-2700
1
*
Read out software IL-2700
1
*
U-tube manometer with field tripod
1
Infiltration hoods
2
Restriction ring for sand compaction
1
Funnel
1
Pipette ball
1
Transport case
1
Optional Equipment: Tension chamber
* only supplied with electronic data acquisition / IL-2700

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List of abbreviations
a
Arc radius of circular source area
[L]
F
Source area of infiltration
[L2]
h
Hydraulic pressure head
[L]
Hk
Height of Infiltration chamber
[L]
Hs
Waterlevel in standpipe
[L]
kf
Saturated hydraulic conductivity
[L/T]
ku
Hydraulic conductivity
[L/T]
LDP
Bubblepoint
[L]
Q
Steady-state flow
[V/T]
q
Ratio of two source areas
-
rs
Effective radius of the infiltration area
[L]
T
Submersion depth of the air intake pipe
[L]
t
Time
[T]
Us
Negative pressure at U-tube manometer
[L]
Us(le)
Waterlevel in left limb of the U-tube manometer
[L]
Us(ri)
Waterlevel in right limb of the U-tube manometer
[L]
Usmax
Maximum pressure at U-tube manometer
[L]
vB
Infiltrationrate into soil
[L/T]
Z
Waterlevel in infiltration chamber
[L]
α
Gardner co-efficient
[L-1]
π
Number pi
-

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2. Introduction
The Hood Infiltrometer IL-2700 (Fig. 1) is used for measuring the soil hydraulic conductivity
near saturation in field tests. Infiltration starts from a closed hood filled with water and stand-
ing on the ground. The circular surface under the hood is directly covered with water and acts
as the source area of infiltration flow. There is no need for providing a contact layer on the
measuring surface or any preparation of the soil. Only the vegetation has to be cut short
enough, to not influence the hood.
The hydraulic pressure head in the water volume under the hood is controlled by a MARIOTTE
water supply system. The effective pressure head on the soil surface can be chosen freely
between zero and a negative pressure up to the bubble point (air permeation value) of the
soil. That pressure head is measured precisely by means of a supplemental U-tube manome-
ter.
An additional soil tensiometer measures the water tension in a defined soil depth and hence
enables the exact determination of the hydraulic gradient for the recent water flow.
It is advisable to calculate the hydraulic con-
ductivity from the steady-state infiltration
according to WOODING (1968) as determined
in the course of the test.
Two hoods with an infiltration area ratio of
approximately 1:2 are available for the infil-
tration test.
An additional infiltration chamber together
with the MARIOTTE water supply system
makes up a regular tension infiltrometer en-
abling infiltration tests up to about 60 hPa
irrespective of the bubble point of the soil.
The data for the flowrate can also be collected with a pressure sensor and the micrologger
IL-2700 and read out to a PC and evaluated using the IL-2700 software
Fig. 1: Hood Infiltrometer IL-2700 in measuring position

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3. Underlying theoretical principles
Hydraulic conductivity kuas a function of water tension hin soils or other open-pored materi-
als near saturation can be described according to GARDNER (1958):
).( h
fu ekk


(1)
kf- saturated hydraulic conductivity
h - hydraulic pressure head (pos. In overpressure range)
α - Gardner-Koeffizient
Such approach allows an analytical solution for a large number of two- and three-dimensional
flow processes. It is the regular basis for the interpretation of test results with the infiltrome-
ter systems common so far.
According to WOODING (1968), the following applies to the steady-state flow Q(volume/time)
from a circular infiltration area (radius a) into the infinite soil:
)
4
1(
2a
kaQ u 


(2)
For experimental determination of kf and  , the infiltration test can be run with different wa-
ter tensions (hydraulic pressure heads) or the infiltration gets fed from source areas with dif-
ferent radii for equal water tensions. However, infiltration from different source areas makes
sense only in largely homogeneous soils.

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4. Methodology of the experimetal procedure
4.1 Infiltration tests with different water tensions
The Hood Infiltrometer allows the infiltration test at different water tensions up to the bubble point
of the soil or the membrane below the infiltration chamber (radius a).
For neighboring values of the chosen water tensions (h1, h2) applies according to equations (1), (2):
)
4
1(
1
2
1a
ek
a
Qh
f






(3)
)
4
1(
2
2
2a
ek
a
Qh
f






(4)
By way of division we get:
)(
)ln(
21
2
1
hh Q
Q

 
(h1, h2 < 0)
(5)
And for the hydraulic conductivities we get:
)
4
1(
)( 2
1
1
a
a
Q
hk






(6)
)
4
1(
)( 2
2
2
a
a
Q
hk






(7)
To run an infiltration test with a water tension lower than the bubble point use the infiltra-
tion chamber to make up a tension infiltrometer. Mind the influence of the contact mate-
rial between soil and tension chamber, as here the “series connection” from contact mate-
rial and soil will become effective.

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4.2 Infiltration tests with identical water tensions
On infiltration with identical water tensions from infiltration hoods with different radii ap-
plies for the respective flow rate:
When choosing the source areas with a ration of (10) we get:
12 FqF 
 
2
aF  
(10)
)1(
)1(4
2
1
1
2
1
Q
Q
qa
Q
Q
q





(11)
Now ku and  can be determined for an unknown soil using (11), (8) and (1). As different
soil sections are effective in each test run, soil inhomogeneities will sometimes lead to in-
valid results. In such experiments, equation (11) should be used only for representative
means of the infiltration rates of the infiltration hoods under review.
)
4
1(
)(
1
2
1
1
a
a
Q
hk






(8)
)
4
1(
)(
2
2
2
2
a
a
Q
hk






(9)

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5. Technical Parameters, Set Up and Operation
5.1 Technical Specifications
Tension area:
0 … bubble point with hood
0 … 60 hPa with tension chamber
Tension measurement:
U-tube manometer
Resolution 0.1 hPa
Infiltration measurement:
Differential pressure sensor 0 - 70 mbar
Resolution 1 mm water column
Conductivity range of the soil
10-3 m/s to 10-7 m/s
5.2 Assembly and operation of the Hood Infiltrometer
A hood [2] with circular base is standing directly on the soil surface. The space under the hood
is filled with water, hydraulic pressure head getting controlled through a MARIOTTE water
supply system [5, 6, 7]. Water-saturated fine sand is used to seal the edge of the hood against
the soil up to an outer ring [1]. Such sealing will be effective only if the pressure in the water
volume under the hood is negative. The negative pressure can be adjusted freely from zero
up to the bubble point (air permeation point). The soil pore system on the measuring surface
will remain absolutely undisturbed.
When setting up the test system, first the overflow chamber [3] under the hood has to be
filled –well controlled - with water. Upon overflow of that chamber begins the volume under
the hood gets filled with water and the infiltration into the soil starts. The enclosed air is piped
into the air volume of the infiltration reservoir [5] through the vent pipe [10].
Attention!
For unstable soils or non-structured sands the soil surface under the overflow chamber
should be prevented from flushing out applying a rag.
After the air escape hose has been closed [V2, V3], the water volume under the hood remains
in steady-state. Now the infiltration flow is delivered directly from the infiltration reservoir of
the MARIOTTE water supply system from where the reading can be taken of a scale (filling
height).

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The effective hydraulic pressure head on the soil surface is determined from the height of the
water table in the standpipe [4] and from the negative pressure at the U-tube manometer [8].
For this, the zero point of the scale on the standpipe is at soil surface level.
Attention!
For an exact measurement of the water tension in the soil the bottom edge of the hood
needs to be exactly on the same level as the soil surface. For unstable soils the rest of
the hood needs to be supported additionally (ring with bearing).
Fig. 2: Schematic setup of the Hood Infiltrometer
1Fine sand sealing
2Plastic hood
3Buffer vessel
4Standpipe
5Infiltration reservoir
6Bubble Tower
7Air intake pipe
8U-tube manometer
9Hose connection 1
10 Vent pipe
11 Hose connection 2
12 Stand
B Filling level of the bubble tower
Hk Distance between soil surface and air outlet
Hs Water level in the standpipe
I Maximum filling level of the infiltration reservoir
K Valve for cutting off the pipette ball
P Pipette ball
T Immersion depth of the air intake pipe
Us height difference at the U-tube manometer
V1 Valve for separating the water volumes
V2 Valve for separating the air volumes
V3 Valve for pressure adjustment
Z Filling height of the infiltration reservoir

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6. Test procedure
6.1 Preparation of the Hood Infiltrometer
Putting up the Hood Infiltrometer please mind that it only works properly on level measur-
ing sites.
First screw the tripod (Fig.:2 [12]) into the base plate of the infiltration reservoir and align it
vertically. Fill the bubble tower [6] with water up to the marking “B”. Therefor draw the air
intake pipe [7] and insert the funnel. Close Valve “V1” and fill the infiltration reservoir with
water up to the marking “I” following close it with the plug. If using a Hood Infiltrometer
IL-2700 with pressure sensor and capturing the data with the handheld logger it is advisable
to calibrate the pressure sensor before the test run. Therefor filling the infiltration reservoir
should be carried out as last step and the calibration process at the handheld device needs
to be started before filling the infiltration reservoir. See more information on this at chapter
“8.6 Calibration”.
Connect the hood to the infiltration reservoir with the hose connection 2 [11] and the
vent pipe [10] and make sure the valves “V2” and “V3” are closed. Connect the U-tube
manometer to the upper end of the standpipe with the hose connection 1 [9] and fill the
U-tube manometer up to the zero marking of the scale if necessary.
6.2 Setting up the Hood Infiltrometer
The site for the hood should be levelled as possible. If necessary, cut the vegetation down
to approximately 5 mm. Put the outer ring onto the ground and push it in evenly a few
millimetres (Fig. 3). Following place the hood centrically in the outer ring.
Place the infiltration reservoir in its designed position and align it vertically using the
screws. The hose connection [11] should decline in a bow. Fill the gap between the hood
and the outer ring [1] with fine sand and moisten the sand using the wash bottle (Fig. 4).
Fig. 3
Fig. 4
Installation of the Hood with shortened vegetation and sealing with sand.

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6.3 Filling the hood
The immersion depth “T” of the air intake pipe should be about 2 cm more than the dis-
tance between soil surface and air outlet “Hk”. Thus the hydraulic pressure “zero” appears
narrow under the soil surface.
Open [V1] slowly. Thereby the overflow chamber [3] gets filled with water. In doing so the
hose connection 2 should be completely de-aerated. Remaining air bubbles may be re-
moved by moving the hose connection and lifting or tipping the infiltration reservoir as long
as it is assured that the hood isn`t moved.
The Water in the infiltration reservoir is set to a negative pressure. As long as the system is
airtight the overflow chamber won`t overflow. If the overflow chamber overflows please
check that all Valves are closed and none of the 2 gaskets at the connection faces of the
hose connection or the gasket of the socket for the air intake pipe is missing or damaged.
Open Valve “K” and suck air off the hose connection 1 [9] (pipette bulb) till the water level
in the standpipe [4] reaches center scale. Following close valve “K” and keep it closed.
Slowly open the aeration valve “V2”. Thereby the space under the hood is set to a negative
pressure and the water flows over the overflow chamber. Now the filling of the hood
started.
Shut [V2] as soon as the water table has reached the mark on the hood. Thus the infiltration
flow raises the underpressure until the aeration of the Mariotte water supply system starts.
Once the aeration started the the underpressure under the hood remains at a steady state.
He is determined and controlled by the immersion depth “T” of the air intake pipe. On sites
with poor infiltration the underpressure under the hood might not be enough to start the
aeration. In this case evacuate additional air through the valve [V3] to keep the negative
pressure under the hood at the desired value.
The negative pressure Us at the U-tube manometer should always be higher than the water
table Hs on the scale of the standpipe.
6.4 Choosing the effective water tension
The effective water tension “h” on the soil surface is calculated irrespective to the regula-
tion directly out of the water level “Hs” in the standpipe and the negative pressure “Us” at
the U-tube manometer.
ss UHh 
( h< 0 !! )
(13)
It is advisable to start the test with water tension “Zero“to record the saturated hydraulic
conductivity
The scale values at the hood (Hs) and at both brackets of the U-tube manometer “Us”
should be recorded.

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6.5 Measuring the infiltration rate
After choosing the water tension the leakage rate “Z/t“(cm/s) is measured on the infil-
tration reservoir. Therefor the filling height Z is recorded as a function of time (if possible,
Z > 1cm).
For the data recording it is convenient to use a log as shown in table 1.
1) Us = Us(le) + Us(ri) (left/right limb of the U-tube manometer)
In addition to the manual recording the data for the leakage rate can also be recorded dig-
ital with the Micrologger IL-2700 (Chapter 8).
Each test has to be run up to a steady-state infiltration rate. Depending on the type of soil
involved, infiltration to mid-column will be required.
Following each test run increase the water tension step by step (h 1 - 2 cm) up to the soil
bubble point. Determine the steady-state infiltration rate for each step. This being calcu-
lated from the steady-state leakage rate A divided by the ratio of the sectional areas of
infiltration reservoir to hood (chapter 7).
6.6 Bubble point (BP) of the soil
To determine the bubble point of the soil Shut [V1] and watch the pressure rise on the U-tube
manometer.
Determine the maximum of Us.
maxSS UHBP 
( BP < 0 )
(14)
Infiltrations reservoir
U –Tube1)
Hood
Time
Z (Scala)
Z / t
Us(le)
Us(ri)
Hs
h
min:s
cm
cm/s
cm
cm
cm
cm
Table 1: Heading for data recording

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6.7 Soil Tensiometer
During infiltration tests the water movement is influenced by gravitation and matrix poten-
tial. Reaching steady-state flow conditions the influence of the matrix potential is widely
subsided, given that the infiltration front is moving deep in the soil. The infiltration is almost
solely influenced by gravitation.
But the unit gradient of 1 cmWS/cm only develops at a uniform distribution of the ku-func-
tion over the infiltration range. For layered soils the flow velocity is determined by the layer
with the least hydraulic conductivity and the resulting surcharge. Since the flow rate is con-
stant over the soil depth (“series connection”) in each case the gradient forms according to
the k-value of the soil layers.
For layers near to the surface the effective gradient can be determined, if the effective
tension is measured prior to the lower layer boundary. Herefore up to three soil tensiom-
eters can additionally be installed at a shallow depth. The soil tensiometers as well as the
appropriate outer ring are available at UGT-GmbH.
7. Infiltration Measurement with the tension infiltrometer
To determine a representative ku-function a hood Infiltrometer test from tension “zero”(kf-
value) and the bubble point of the soil is advisable. Thereby the efficient macropores are not
distorted or clogged.
From the bubble point the measurement needs to be made with the tension infiltrometer.
The fine sand of the contact layer needs to be chosen in such a way that its hydraulic conduc-
tivity is always higher than the hydraulic conductivity of the tested soil.
For installation connect the tension chamber to the infiltration vessel and the U-tube manom-
eter using connecting hoses [11] and [9]. Make sure that valve "V2" is shut. The vent pipe [10]
is not used for the tension infiltrometer.
The designed measurement site needs to be smoothened. Following place the outer ring at
the measurement area and fill it with fine sand up to 2 mm. Cover the measuring area inside
the ring with fine dry sand about 2mm high. Thereafter cover the fine sand filled measurement
area with a waterproof foil and place the tension chamber even on the foil. Choose the im-
mersion depth “T” of the air intake pipe slightly bigger than the chamber height “Hk”. Fill the
tension chamber opening the valve “V1” and suck off air through the hose connection [9] until
the water level in the standpipe reaches center scale.
To start the infiltration flow, lift the chamber and remove the foil. Putting the chamber back
onto the measurement area, turn it slightly to establish a good contact with the fine sand.
Subsequently the measurement proceeds in the same way as the measurement with the
hood did. As soon as the aeration at the Mariotte water supply starts, the effective water
tension set by the immersion depth “T” according to equation (11) takes effect at the soil

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surface. The infiltration rate “Z/t“(cm/s) is measured at the infiltration reservoir until the
steady-state infiltration rate for tension h1 can be determined.
Then change the water tension by changing the depth of submergence and determine the
steady-stateinfiltration rate for water tension h2.
8. Calculation of hydraulic conductivity
In the test run the final steady-state value of the infiltration rate “Z/t” on the infiltration
reservoir at the chosen water tension h is determined. Insert the according infiltration rate of
the soil vB in equation (12). The following applies (with rs = radius of infiltration reservoir).
t
Z
raQ SB 

 22 
(15)
t
Z
q
t
Z
a
r
a
QS
B





2
2
2


(16)
Factor qis the ratio of the cross-sectional area of the infiltration reservoir and the respective
infiltration areas that are effective on the soil surface (see Table 1).
In equation (10) applies for the ratio of the infiltration rates at different water tensions:
t
Zt
Z
Q
Q





2
1
2
1
(17)
Radii of the infiltration areas (outer rings)
Infiltration areas on soil
Cross-sectional area of infiltra-
tion reservoir
Hood (small)
a1= 8.8 cm
F1= 240 cm²
Fi= 75.1 cm²
Hood (large)
a2= 12.4 cm
F2 = 483 cm²
Tension chamber
a = 12.4 cm
F = 483 cm²
Fi / F1 (small hood)
q1= 0.,313
Fi / F2 (large hood)
q2 = 0.156
Fi / F(Tension chamber)
q = 0.156
Table 2: Technical details of apparatus and calculation parameters
Infiltration area at Table 2 describes the area within the ring, because the sand between ring
and hood has usually a high conductivity.

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9. Micrologger IL-2700
9.1 Features
The UGT-Micrologger IL-2700 captures the discharge rate out of the infiltration reservoir
„ΔZ/Δt“at different tensions at one test site (series of measurement). It is possible to rec-
ord up to 8 tension steps.
9.2 Technical Data
The UGT micrologger IL-2700 has two interfaces:
Input "IN" for the sensor data cable (socket at the left side) and
Output "RS 232" for the PC data cable (socket at the right side) (see Fig. 5).
Sensor
Differential pressure sensor 0 - 70mbar
Process connection
Infiltration reservoir and hose connection
Measuring range
+/- 700mmWS
Data backup
Storage capacity 8000 data sets, 24 Bit
Sampling interval
wählbar von 1s bis 10h
Data transmission
serial RS 232, 57600 Baud
Display
LCD dot matrix display, 2 lines at 8 characters with key-
board
Power supply voltage
9V block battery

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Fig. 5: Micrologger IL-2700
9.3 General guidelines for operation
A complete specification of the menu structure and the functions of this handheld device
at the chart at subsection “4.8 menu structure” as well as on the appositional laminated
leaflets.
In the context of the menu navigation the “Start”-button is always used in terms of an
“Enter” button and the “On”-button is used in terms of “Escape”. Hence the “Start”-
button always leads to the next lower menu section and the “On”-buttonback to the next
higher menu section. The operation of the “Step”-button relates to the down arrow key
and is used to choose a menu item
Setting the sampling interval and the tension in the according menus, the values can be
raised by 10 by holding the “Step”-button (1 sec) and set to 0 by holding the “On”-button.
In principle the logger can be read out directly at the measurement site, e.g. with a laptop,
perhaps to check the measurement results. But it is recommended to unplug the
connection cable between handheld device and laptop for the measurement to avoid
dysfunctions.
IN
RS 232 (to PC)

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9.4 Measurement
The data recording is carried out according to measurement site and the chosen tension.
The menu provides 10 measurement sites with 8 storage spaces each. Therefore it is easy
to reconstruct later where an under which conditions a data set was recorded. The
designated measurement site is chosen at the main menu respectively at the
measurement site menu. In the following sub menu it is to decide if the measurement site
is used or deleted.
Afterwards the memory space for the tension is chosen in an analogous manner. In the
according sub menu additionaly the menu item for calibration “Kalibrieren” can be found.
Before the sampling interval and the tension can be set up, the program checks if the
storage space is already used and if a complete calibration was proceeded. If not, a
corresponding note is shown at the display. If the memory space is taken it can be chosen
between using another memory space or deleting the current one. In case of an
incompletely calibration please follow the instructions at sub chapter “4.6 Calibration” on
page 16.
In the following two steps first the measurement interval and afterwards the tension is
set up. Subsequently the measurement itself begins. For each measurement a maximum
of 100 values can be recorded. But after reaching a steady flow rate only the preset
number of readings is recorded (more information under “4.5 Remarks for the
configuration of a measurement”). After this the measurement is finished and the menu
is automatically switched to the menu for choosing a memory space for a tension. The
steady state infiltration is marked with a wave symbol at the right end of the upper line.
During a measurement holding the “Start”-button (1 sec) cancels the measurement.
As the consistency of the flow rate can`t be verified consistently in case of discontinuities,
the measurement should always be canceled if any hold-ups occur (e.g. refilling). This way
you get a split data set.
9.5 Remarks for the configuration of a measurement
The configuration menu can be found at the menu item “Options”. In the according sub
menus it can be defined over how many differences of values the moving average is
calculated (1-5), how many values are recorded after reaching the steady state (1-50) and
for which difference between moving average and the last recorded value the flow rate
is assumed as constant (1-20%). Default values are 3, 20 and 5% and can be reset at the
sub menu “Default”.
If the moving average is set to 1 the flow rate is not checked for constant conditions and
the maximum number of values (100) is recorded.

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9.6 Calibration
The calibration menu can be found in the menu “Options” as well as in the sub menu for
choosing the memory space for a tension. This enabling to easily access the calibration
menu before each measurement if needed.
Offset-value and scaling factor can be calibrated separately. Both values need to be set to
execute a measurement.
The offset is usually calibrated at a pressure of 100 mmWC. Therefore fill the infiltration
reservoir up to 100 mm at the scale and press the “Start”-button. But it is also possible to
calibrate the offset at any other pressure. If the offset calibration doesn`t accord with the
scale the absolute values recorded by the handheld device don`t match with the scale, but
it has no effect on the differences.
The scaling factor is usually calibrated at a pressure of 600 respectively 610 mmWC.
Therefore the infiltration reservoir is filled up to 600 mm (respectively610 mm) and the
current pressure is entered into the handheld device and confirmed with the “Start”-
button. It is possible to use any other pressure value for this calibration too, but for
accuracy reasons it is recommended to use the highest possible pressure difference. The
plug is supposed to stay open for the calibration
For a convenient execution it is useful to calibrate the offset after putting up the Hood
Infiltrometer at the test site but before filling the infiltration reservoir and to calibrate the
scaling factor directly after filling the infiltration reservoir (still open against atmosphere).
9.7 Configuring the measurement interval /Starting a measurement
The measurement interval is defined before every measurement. To get to this point
proceed as shown in the scheme on page 18 to 22. First of all the handheld device IL-2700
is switched on pushing the “On”-button. The measurement site is chosen by pushing the
“Step”-button accordant times and confirming it pushing the “Start”-button. Thus
reaching the menu for managing the measurement sites. Measurement sites already taken
by data are marked with OK and can be deleted in this menu if needed. If the measurement
site is still clear the tension menu is reached by pushing the “Start”-button.the designated
tension is chosen using the “Step”-button. Generally tension 1 for the first set up tension
of the measurement continuing for every following tension. Confirmation of the tension
with the “Start”-button leads to the menu for managing the tensions. If needed already
set up tensions can be deleted or a calibration can be done in this menu if this hasn`t been
done before at the options menu.
Push the “Start”-button right at the first menu item (Start) to start the measurement.
The display shows „Samples: H0M00S00” to set first of all the hours (H), following the
minutes (M) and last the seconds (S) of the measurement interval. The numerics can be
raised by one pushing “Step”. Holding the “Step”-button causes automatic steps by ten for
minutes and seconds until the button is let go. “Start” confirmes the entry and switches to
the next smaller timescale. The changing of the lower time scale doesn`t affect the higher
time scale. (The set minutes don`t change if the seconds change from 60 to 0). In case of a
wrong entry it is possible to go back for correction pushing “On”. After entering the seconds