HMP LFG4 User manual

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CONTENTS
Service [phone]/2017 Instruction Manual HMP LFG4 – en
General Information
Applications .................................................................................... 2
Safety instructions .......................................................................... 2
Intended Use .................................................................................. 3
Technical Terms of Reference / Transport..................................... 3
The Light Weight Deflectometer
Construction of the Instrument....................................................... 4
Function .......................................................................................... 5
Specifications ................................................................................. 5
Operation of Electronic Settlement Measuring Instrument............ 6
Measuring
Getting Ready for Measuring ......................................................... 7
Measuring Procedure ..................................................................... 8
Store and Print Current Measured Data......................................... 9
Completing the Test ..................................................................... 10
Error Menus .................................................................................. 10
Measured Data
Read / Print the Stored Measured Data ....................................... 11
Transfer the Stored Measured Data............................................. 11
Delete Measuring Results ............................................................ 12
Settings
Display .......................................................................................... 13
Device ........................................................................................... 13
Printer............................................................................................ 13
Options
Thermal printer AP1300................................................................ 14
GPS Receiver................................................................................ 16
Maintenance and Repair
Cleaning........................................................................................ 19
Calibrating .................................................................................... 19
Hotline........................................................................................... 19
Attachment
1 Certificate „BASt-authorised calibration institute ...“
2 Certificate of Conformity

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GENERAL INFORMATION
Service [phone]/2017 Instruction Manual HMP LFG4 – en
Applications
The dynamic plate load test employing the Light Weight Deflectometer is used
in earthworks and traffic route construction. It serves to determine the soil
bearing capacity and the degree of compaction of soils and non-cemented
base courses, and assists in soil improvement.
The test method is suited for coarse-grain and mixed-grain soils with a
maximum grain size of 63 mm. It may be used to determine the deformation
modulus of soil within the measuring range of Evd = 15…70 MN/m².
Further applications
Road- and railway construction, earthworks
Quality assurance in canal construction
Compaction control in pipe trenches
Testing of pavement beddings
Testing of foundation backfill
Quality inspection in boreholes
Testing of modulus of deformation within the framework of soil examination.
The Light Weight Deflectometer being easy to handle and use is particularly
suited for intra-company monitoring.
Safety instructions
Information for Users
This instruction manual was prepared such that users can easily become
familiar with the »Light Weight Deflectometer – LWD«, abbreviated herein-after
as LWD, and make use of the tester for intended applications.
Users should carefully read this instruction manual and the safety instructions
prior to using the LWD. Follow the instructions contained in this Instruction
Manual without exception.
Symbols Used
Warnings and instructions are highlighted as described below:
Warning
This symbol is used in conjunction with related text to draw user's
attention to hazards and risks which may causebodily harms, failure
of tester components or adversely affect operating procedures, in
case users do not take the corresponding precautions.
Note
This symbol and the related text identify technical requirements and
provide additional information to be taken into account by the
operator to carry out the following operations effectively and safely.

3
GENERAL INFORMATION
Service [phone]/2017 Instruction Manual HMP LFG4 – en
Legal Terms of Reference
The Light Weight Deflectometer complies with the current state of the art and
all applicable safety regulations.
The LWD meets the basic safety requirements laid down in the EU Directives
for Harmonisation referenced in the EC Certificate of Conformity.
Construction and function of the LWD meet the requirements laid down in
»Technical Test Code for Soil and Rock in Road Construction TP BF – StB Part
B 8.3 / Issue 2012« and »ASTM E2835-11 – Standard Test Method for
Measuring Deflections using a Portable Impulse Plate Load Test Device«.
Intended Use
The Light Weight Deflectometer is exclusively intended for determining the soil
bearing capacity and the compaction quality of the soil referred to »Technical
Test Code for Soil and Rock in Road Construction TP BF – StB Part B 8.3 /
Issue 2012« and »ASTM E2835-11 – Standard Test Method for Measuring
Deflections using a Portable Impulse Plate Load Test Device«.
Its intended use also includes:
Compliance with the safety instructions and safety regulations contained in
this operating manual;
Compliance with the maintenance and servicing instructions contained in
this operating manual.
Any other use or any use beyond this definition is not intended and may cause
injury to people and damage to property.
The manufacturer/supplier shall not be held liable for damages resulting from
other than the intended use. The risk shall be borne solely by the user.
Technical Terms of Reference / Transport
To avoid damage to the unit and prevent accidents during transport the Light
Weight Deflectometer is provided with a transportation lock which is fixed to
the guide tube during transport.
The LWD is equipped with a transportation lock designed to avoid
damage to the instrument and make sure that it can be safely
transported and handled. This lock must be used to secure the drop-
weight on the guide tube whilst the equipment is moved from job to
job.
The drop height determined for the drop-weight by calibration (calibration
record) has been preset. The drop height is secured against changes and
must not be altered by the user.
Engage the drop-weight in the release mechanism prior to any test. To release
the drop-weight, just actuate the release mechanism.
Prior to any measurement, test the release mechanism to be sure it
functions as necessary.
Support the drop-weight by hand after every impact to avoid faulty
measurements.

4
THE LIGHT WEIGHT DEFLECTOMETER
Service [phone]/2017 Instruction Manual HMP LFG4 – en
Construction of the Instrument
The LWD consists of the following assemblies:
Loading mechanism
Load plate
Electronic settlement measuring instrument
Loading Mechanism and Load Plate
Construction of the loading mechanism and the load plate is described with
reference to the figure below.
Loading mechanism
1 – Handle 5 – Drop-weight
2 – Release mechanism 6 – Transportation lock
3 – Bubble level 7 – Resilient element with prestressed
disc springs4 – Guide tube
Load plate
8 – Cap with sensor
9 – Sensor socket (to connect the measuring cable)
10 – Load plate carrying handles
The sensor which serves to measure the settlement is arranged under the
cap (8) of the load plate. The leads of the sensor are led out on the sensor
socket (9) and are connected to the electronic settlement measuring
instrument via a measuring cable.
Electronic Settlement Measuring Instrument
The battery-operated settlement measuring instrument is housed in a hand-
held case.
Settlement measuring instrument
1 – LCD graphic display
2 – Measuring cable outlet
3 – Function keys
4 – USB port
5 – GPS port
6 – Printer port
Carrying case
1 – Carrying case
2 – Settlement measuring instrument
3 – GPS receiver (optional)
4 – Charger for thermal printer AP1300
(optional, beneath the measuring instrument)
5 – Thermal printer AP 1300 (optional)
10
2
3
4
5
6
7
8
9
1
5
2
6
1
Enter
3
4
2
5
3
4
1

5
THE LIGHT WEIGHT DEFLECTOMETER
Service [phone]/2017 Instruction Manual HMP LFG4 – en
Function
The load plate is placed on the prepared area to be tested and the loading
mechanism is positioned on the load plate. Thereafter the connection is made
to the settlement measuring instrument. When the drop-weight is released and
drops freely onto the resilient element, the loading mechanism generates a
defined impulsive load. Thereby the total settlement of the soil under the load
plate is measured.
After the measuring routine is started (after the precompaction) three
measuring impacts are to be performed. After each impact, the measuring
instrument displays the settlement in millimetres. Upon completion of a series
of measurements the individual settlement amplitudes, the average settlement
Sm, the path-speed-ratio (s/v) and the calculated deformation modulus Evd
are displayed on the screen.
Results may be printed via a thermal printer or a printer at the PC, if required
(only instruments with thermal printer or PC-software).
Specifications *
Mechanical loading mechanism
Total weight 15.0 kg
Weight of drop-weight 10.0 kg
Maximum impact force 7.07 kN
Duration of impact 17.0 1.5 ms
Resilient element package comprising prestressed
disc springs
Load plate
Diameter 300 mm
Plate thickness 20.0 mm
Weight 15.0 kg
Electronic settlement measuring instrument
Power supply 4 of - R6 batteries
or rechargeable batteries
Dimensions 211 mm x 100 mm x 45 mm
Weight 0.47 kg
Settlement range measured 0.1 to 2.0 mm 0.02 mm
Measuring range for deformation modulus Evd < 225 MN/m²
Temperature range 0 to 40 °C

6
THE LIGHT WEIGHT DEFLECTOMETER
Service [phone]/2017 Instruction Manual HMP LFG4 – en
Operation of Electronic Settlement Measuring
Instrument
The electronic settlement measuring instrument HMP LFG4can be operated
easily and intuitively by means of the function keys.
Key Functions
Switch on / off measuring instrument
Select upward
Select downward
Confirm selection / Start action
Overview Menu Functions
Measuring Taking measurement
Measured data Read/Print
USB
Delete
Back
Settings Display Date
Time
Language
Back
Device Drop weight
GPS
Unit
Calibr.date
Back
Printer Print head
Date/time
Graphics
Contact data
Back
Back
By confirming the menu item »Back« you always come back to the previous
menu.
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7
MEASURING
Service [phone]/2017 Instruction Manual HMP LFG4 – en
Getting Ready for Measuring
The procedure of preparation and performance of measurements is
laid down in »Technical Test Code for Soil and Rock in Road
Construction TB BF-StB Part B 8.3 / Issue 2012 – Dynamic Plate Load
Test by means of the Light Weight Deflectometer« and in »ASTM
E2835-11 – Standard Test Method for Measuring Deflections using a
Portable Impulse Plate Load Test Device«.
Preparing the area to be tested
The load plate must be in full-area contact, so that the impact force can be
optimally transmitted to the ground and the maximum settlement amplitude
under the entire area of the load plate is determined.
Select a plain area on the measuring site.
Position the load plate while slightly turning and pushing.
Fill hollow spaces under the load plate if necessary with loose medium
sand.
Connecting the settlement measuring instrument
Connect the sensor, which is located under the cap (8) of the load plate, via
sensor socket (9) with the settlement measuring device.
–Remove the cap from the sensor socket.
–Insert the plug of the measuring cable from the settlement measuring
instrument into the sensor socket until it is locked.
The plug locked in the sensor socket can only be removed by pulling
on the plug housing. Do not pull on the cable.
Take care to ensure that the contacts of the plug and the sensor
socket are not damaged.
Use the protective cap provided on the cap (8) to protect the sensor
socket from dirt and moisture.
Positioning the loading mechanism
Position the loading mechanism on the cap of the load plate.
The tilt protection enables free standing of the loading device on the load
plate.
Removing the transportation lock
A transportation lock (6) is provided to secure the drop-weight on the guide
tube. This lock must be released prior to performing measurements.
Withdraw red knob.
Rotate red knob through 90 deg.
The arrow is horizontal: either or drop-weight is locked
The arrow is vertical: either or drop-weight is unlocked
The transportation lock has to be unlocked before measuring,
otherwise mis-measurements and damages of the guide tube can be
caused.

8
MEASURING
Service [phone]/2017 Instruction Manual HMP LFG4 – en
Precompacting the test area
To achieve an optimal position of the load plate on the base the test area
under the load plate should be precompacted by three impacts.
Move the drop-weight fully up on the guide tube with the right hand and
lock it in the release mechanism.
Use the bubble level (3) to align the guide tube until it is in vertical position
to the soil.
Release the lever, the drop-weight falls onto the resilient element package.
Catch the rebounding drop-weight by hand and lock it back in the release
mechanism.
Repeat this procedure twice.
Measuring Procedure
The base settings of the electronic settlement measuring instrument
comply with the ordered device type.
Individual adjustments can be carried out in the »Settings« menu
(page 19).
Press the key to switch on the settlement measuring instrument.
The main menu shown on the left is displayed on the LCD screen with
type and number of device (xxxx), the individual menu items and the
voltage state of the measuring instrument batteries.
Optionally a note regarding the state of charge of the printer accumulator
(after pressing the keys) appears.
In case the settlement measuring instrument is equipped with a
Bluetooth interface optionally the note »HMP-LFG-BT Power on GPS!«
appears, shortly after the main menu is displayed.
In case that the measuring instrument battery voltage falls below the
required minimum voltage, an additional advice »Change« appears.
Please confirm the »Measuring« mode by pressing the key.
The menu shown on the left is displayed on the LCD-screen.
At the same time the user information »Precompact three times please!«
appears.
If the soil was not precompacted yet, please follow the instructions in section
»Precompacting the test area« (page 7).
Start the measuring process by pressing the key.
An acoustic signal is emitted and on the screen appears the request
»measuring initiate«.
The readiness for measurement only insists during displaying
»measuring initiate«.
Successively perform 3 impacts as follows.
Lock the weight in the release mechanism.
Use the bubble level to align the guide tube until it is in a vertical position to
the load plate.
Release the lever, the drop-weight falls down, catch the rebounding drop-
weight by hand.
The values of settlement amplitudes S1, S2 and S3 are displayed on the
screen.
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*HMP LFG-SK*XXXXX
measuring
measured data
settings
meas.dev.
measurement 1
Precompact three
times please!
measuring .

9
MEASURING
Service [phone]/2017 Instruction Manual HMP LFG4 – en
Failure to catch the rebounding drop-weight may cause undesirable
compaction of the test area and, hence, faulty measurements.
The series of measurements is automatically completed after the third
measurement. The menu on the left is displayed on the LCD-screen including
the individual settlement amplitudes and the average settlement Smas well as
the path-speed-ratio s/v and the calculated Evd -value.
Store and Print Current Measured Data
Upon completion of one test series the current measured data can be stored
or rejected. Furthermore there is also the possibility to print the current test
series (only devices with printer) as well as to display the GPS-data (only if a
GPS-receiver is connected).
The GPS data can only be shown, when the item GPS is activated in
the Settings / Device menu.
Before using the thermal printer AP1300 please read the instruction
manual (page 13-16) and follow the given instructions regarding
putting it into operation and handling.
By pressing the keys the following functions can be chosen
(depending on the device settings):
Save: Store the current test series under the displayed test
series number
Delete: Delete the current test series and return to main menu
Print: Print out the current test series
GPS-data: Displaying the GPS-position
Settlement data: Displaying the individual settlement amplitudes and the
average settlement Smas well as the the path-speed-ratio
s/v and and the calculated Evd-value
Back: Return to main menu
The function »Delete« is only available before storing and the function »Back«
only after storing. Displaying the GPS-position is only possible after storing.
As soon as the message »Memory full!« appears on the LCD display,
storage space in the measuring instrument has to be created by
transferring the stored series of measurements to the USB-Stick or
the PC (page 11) and subsequent deletion (page 12).
It is recommended to transfer the test series and measurement
results stored in the measuring instrument regularly onto the provided
USB-Stick or to the PC (page 11) and to delete afterwards the data
in the measuring instrument (page 12).
In this way the transference time will be shortened and multiple data
transfer avoided.
measurement 1
#.### #.### #.###
Sm= #.###mm s/v= #.##
Evd= ##.##MN/m²
save .
measurement 1
#.### #.### #.###
Sm= #.###mm s/v= #.##
Evd= ##.##MN/m²
save .