MEASURING
Service +49(0)391 2514666 02/2017 Instruction Manual HMP LFGpro – 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 enclosure. 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 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.
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