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Version 1.4 May 09
It is VITAL that personnel responsible for the installation and
use of the piezometers READ and UNDERSTAND the manual,
prior to working with the equipment.
**********
As stated before, it is vital to check all the equipment in the shipment soon after
taking delivery and well before installation is to be carried out. Check that all
components that are detailed on the shipping documents are included.
5.0 INSTALLATION
This section of the manual is intended for all users of Vibrating Wire Piezometers
manufactured by MGS Geosense and is intended to provide guidance with respect to
their installation.
It must be remembered that no two installations will be the same and it is inevitable
that some ‘fine tuning’ of the following procedures will be required to suit specific site
conditions.
5.1 ZERO Pressure or BASE Readings
Vibrating wire transducers differ from most other pressure sensors in that they
indicate a reading with no pressure applied. ZERO or BASE Readings can vary
significantly between sensors.
It is, therefore, ESSENTIAL TO TAKE BASE READINGS
BEFORE
INSTALLATION.
As with all transducers, do not directly handle the piezometer body when recording
the base readings, as this will cause local temperature gradients across the
piezometer that will distort the readings.
Where piezometers are to be installed with their bodies orientated either horizontally
or with their filters upwards, read the base readings in a similar orientation. ( Low
pressure transducers, in particular, can be very sensitive to orientation. Always
obtain base readings with the sensor orientated in the same direction in which it will
finally be installed.
