Tilt Measurement Instruments

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.
Portable Tiltmeter
	The portable tiltmeter is a unit used to determine the tilt of ceramic or bronze tiltplates which are attached to structures.
Pendulum Tilt System
	The Pendulum Tilt System is for monitoring tilt of tall structures & high rise buildings and for measurement & monitoring of relative displacement in concrete and masonry dams.
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.