FEATURES
• High resolution (up to 0.005mm)
• Large tensile range (up to 200mm)
• Cross-borehole deformation insensitivity
• Remote readout capability
• Supplied with quarter or full wheatstone
• bridge configurations;
• High resistance to moisture ingress
• Can be connected directly to a datalogger
• Available in any length between 1m - 4m

APPLICATIONS
The Resistance Wire Extensometer (RWE) is designed as a simple low-cost instrument for monitoring rock and soil displacements.
They are installed in underground hard rock mines typically in pillar and stope wall to monitor displacements. They are a handy tool for monitoring displacement in roof and pillars in underground coal mines. In dams RWEs are ideal for measuring lateral strains beneath earth and rock fill, as well as displacement across construction joints in concrete.

FEATURES
• Rechargeable battery
• Digital display
• Supplied with carry case & battery charger

APPLICATIONS
Model RWE6001 is a hand-held digital readout unit specifically designed and built for reading the precision Resistance Wire Extensometer (RWE), used in the following applications:
• Underground hard rock; pillar, stope, roof &
• wall displacement measurement
• Concrete construction joints displacement
• Displacements of natural and cut slopes
• Displacements of retaining walls, bridges,
• piers & abutments

FEATURES
• Unique integral magnet design
• Accurate, highly sensitive, reliable
• In-built thermistor & gas discharge tube
• Frequency output for long distances
• Remote reading, scanning, data logging
• Stainless steel construction
• Long term stability & reliability
• Unprecedented sensitivity
• Robust & sturdy construction
• Waterproof

APPLICATIONS
Crackmeters are used to measure movement across surface cracks or joints in structures, concrete or rock.

Separations across lifts in dams, crack separations, surface crack on joints and separation in shotcrete can all be monitored using this instrument. Fault movement in rock near the surface is easily monitored using crackmeters.

FEATURES
• Highly suitable for field applications
• Easy to refill tape
• Accurate, highly sensitive, reliable
• Extremely stable for long term operations
• Light weight
• Dial display for fine measurement

APPLICATIONS
• Measurement of surface movement
• Radial and/or convergence of tunnels,
• shafts, linings
• Deformation of excavations in underground
• power house caverns & audits
• Displacement of retaining walls, cuttings, arch
• & abutments
• Stability of concrete structures and buildings

FEATURES
• Fully proven in coal mine tunnels
• Stainless steel reference tube anchor
• Positive stop stabilising fins
• Suitable for 35-50mm holes
• Improved water diverting system
• Corrosion resistant
• High grade stainless steel wire,
• Sufficient wire for up to 3m bolts
• Low cost
• Easily installed safety monitoring

APPLICATIONS
Dual Height Tell-Tales are safety monitoring devices for indicating tunnel stability. It provides underground workers with instant information on roof condition and operational management with roof deformation history and advance warning of remedial action requirements. The reflective colour bands indicate roof movement both within and above the reinforced height at a glance.

FEATURES
• Easily installed
• Proven & reliable in harsh mining & civil
• engineering environments
• Suitable for various lengths
• Read using simple strain meter

APPLICATIONS
The Sentinel Integrity Monitoring Rockbolt is a new concept in rockbolting safety. The Sentinel is a modified AT rockbolt which can signal to the Mine Rockbolting Engineer whether it is
broken and, if so, where. Bolt failure can occur due to overloading and/or corrosion and when it occurs it can be difficult to detect. We recommend that a row of Sentinel bolts is placed across the tunnel at regular
intervals as substitutes for the standard rockbolts. The exact spacing would depend upon local circumstances.

FEATURES
• Compact size
• Easy to install
• Rugged, durable design
• Easy to use, read and log
• Self adhesive pads for easy installation

APPLICATIONS
Designed to monitor small cracks, Tell Tails consist of 2 sections fixed to either side of a crack. The self adhesive pads on the rear of the tell-tale allow for quick and easy installation. Alternatively, both halves can be drilled and fixed with screws on an uneven or wet surface, or ES&S can provide epoxy glue that adheres to rock or porous shotcrete between temperature ranges of 4-60 degree Celsius. The cross-hairs of the smaller section should be aligned in a central position on the horizontal and vertical axis. Movement can easily be identified with displacement from this position.

FEATURES
• Extremely simple to operate
• Milspec connector
• Internal battery and charger
• Long life battery & Battery test
• Robust reinforced ABS resin enclosure
• IP67 rated
• Complete with easy to carry handle
• Easy to read LCD, with output in millimetres
• Low power consumption
• 6 Channel Device

APPLICATIONS
The exto reader readout unit is a portable device used to read all types of potentiometer based sensors. It is designed to measure in millimetres and is particularly useful with ES&S or Geosystems displacement monitoring range.
Typical applications include measuring deformation around tunnels, mines and other underground excavations. The extensometers or crack meters are commonly installed in natural or cut slope stability and can even detect settlement when installed appropriately.

FEATURES
• Extremely simple to operate
• Quick connect terminals
• Operates on small internally mounted battery • • Internally mounted charger
• Long life battery 12V 2.2AH
• Easy to read LCD with output in millimetres
• Robust reinforced ABS resin enclosure
• IP67 rated
• Low power consumption
• Single Channel Device

APPLICATIONS
The Geosense readout unit is a portable device used to read all types of potentiometer based sensors. It is designed to measure in millimetres and is particularly useful with ES&S or Geosystems displacement monitoring range. Typical applications include measuring deformation around tunnels, mines and other underground excavations. The extensometers or crack meters are commonly installed in natural or cut slopes to monitor slope stability and can even detect settlement when installed appropriately.

FEATURES
• Easy to install
• Standard design mechanically / electronically
• High accuracy with VW displacement sensor
• Individual sensors for multi-point applications
• Light weight

APPLICATIONS
MPBX extensometers are used to accurately measure longitudinal displacement in rock masses or concrete boreholes. Particularly useful for distinguishing deep seated movements from surface spelling, which is of value in assessing the need for or determining the efficiency of a rock bolting system. Other applications include measuring deformation around tunnels, mines & other underground excavations, monitor slope stability and even detect settlement when installed appropriately.

FEATURES
• Three expandable arms for precise diameter
• measurement
• Flexible 2.5m head to handle connector
• User friendly
• Heavy Duty

APPLICATIONS
The micrometer is a mechanical device used to measure the diameter of a roof bolt hole along its length. The standard unit has a range of 25 to 37mm and a 2.5m flexible section connecting handle to head). The hole diameter is read from an etched scale mounted on the handle. It works similarly to a calliper enabling the user to check borehole diameters along the 3m length. It allows for a quick low cost measurement and easily identifies drilling cave ins which is key for rock bolt anchoring systems.

FEATURES
• Pole mounting allows for flexible set up
• Works from -40° to 140°F (-40° to 50°C)
• Precise resolution (.0005 in - .012mm)
• Software can be accessed & viewed on
• connections to the (LAN) or internet
• Base radio & antenna can be mounted
• anywhere with internet connection and near
• line-of-sight with Extensometers
• Multiple base station / repeaters used to
• monitor separate, or prev. inaccessible areas

BENEFITS
• Robust system withstands most environments
• System expands easily to include wired &
• wireless remote strobes
• Warnings issued by software can be sent to
• emails, additional computer monitors, phones
• Data buffering preserves valuable data in
• network outage
• VHF Radio offers stand-alone system
• independently operational