Measurement of tilt is an important parameter
in the monitoring of structures, slopes and the influence of construction activity in the environs of the Works. Originally,
tilt technology was based on either resistive pendulum sensors or electro-mechanical servo accelerometers originally used
in inertial guidance. We use solid state MEMs in our tilt devices which gives increased reliability, faster response
times, lower power requirements and options for innovative logging strategies.
Inclinometer System
An
inclinometer system is used to manually monitor installed inclinometer tubes. The system comprises a wheeled probe which runs
within the orthogonal keyways of the tube, connected to a cable and cable reel which is connected in turn to a logger readout.
In practice, the probe is lowered to the base of the installation and a pair of readings are taken in X and Y axes with the
results stored within the logger. The probe is then pulled up in successive 0.5 metres and further sets of readings
are taken. This is then repeated with the probe rotated 180 degrees. In this way a profile of the inclinometer tube can be
constructed using tilt angles over 0.5 m segments allowing changes in this profile with time to be displayed in tabular and
graphical format.
click here for Inclinometer System PDF
Portable Tiltmeter
The
portable tiltmeter is a unit used to determine the tilt of ceramic or bronze tiltplates which are attached to structures.
click here for Portable Tiltmeter PDF
click here for Pendulum system PDF
IN PLACE INCLINOMETER SDI-12 BUS
The IPI-01 automates data gathering
from conventional inclinometer tubes and comprises a plus/minus 15 degree high precision MEMS tilt sensor and microprocessor
circuitry fitted within a fully encapsulated stainless steel housing. The sensors operate on an SDI-12 bus which means
that only one 4 mm cable connects all sensors down hole. The sensors receive power from the SDI-12
bus and transmit data in engineering units in a digital string to a data logger. Up to a maximum of 52 sensors can be installed
within one inclinometer tube since there are no attendent problems with individual cables as with other systems.
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| IPI SDI-12 Sensor assembly |
click here for IPI PDF
TILTMETER AquaTILT SDI-12 Bus and Serial
The AquaTILT is a single
station biaxial MEMS tilmeter suitable for mounting to structure for monitoring long term movement with a plus/minus 15 degree
range.The AquaTILT is fully encapsulated and outputs data in digital format. The AquaTILT can operate on an SDI-12 bus where
it is powered from a data logger and returns digital data to the logger. It also has a serial port allowing it to be connected
to any serial device, such as a PC or modem for onward cable free data transmission. In Serial operation a separate 12 V power
supply is required to operate the device and attendant modem.
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| Tiltmeter with SDI-12 and Serial |
click here to download file
