Telemac pioneered the development of the vibrating wire extensometer technology for the civil engineering market in 1947. The company is celebrating 70 years of excellence in the instrumentation of structures and foundations.
Telemac pioneered the development of the vibrating wire extensometer technology for the civil engineering market in 1947. The company is celebrating 70 years of excellence in the instrumentation of structures and foundations.
Telemac offers three main product lines: Conventional Sensing, Fiber Optic Sensing, and specialized In-Situ/Laboratory Testing Equipment for soil and rock.
Featured products include the robust C-110 Vibrating Wire Strain Gauges and the GEOSTRING In-Place MEMS Inclinometer system. They also offer in-situ testing equipment like the DMPe Borehole Dilatometer, designed to determine the deformation modulus of rock masses.
Featured products include the robust C-110 Vibrating Wire Strain Gauges and the GEOSTRING In-Place MEMS Inclinometer system. They also offer in-situ testing equipment like the DMPe Borehole Dilatometer, designed to determine the deformation modulus of rock masses.
They offer advanced sensing technologies for critical nuclear applications, including vibrating wire sensors for concrete containment walls. Telemac also supplies force sensors for post-tensioning cables and has developed specialized sensors tailored to the emerging nuclear fusion sector.
They offer advanced sensing technologies for critical nuclear applications, including vibrating wire sensors for concrete containment walls. Telemac also supplies force sensors for post-tensioning cables and has developed specialized sensors tailored to the emerging nuclear fusion sector.
Annual calibration is recommended. Do not exceed 3 years for instruments with batteries/electronics, or 5 years for other measurement instruments. Users should determine the exact interval based on usage frequency.
GEOSTRING is a distributed MEMS accelerometer system that enables continuous real-time monitoring of subsurface lateral and vertical displacements. It eliminates the need for periodic manual inclinometer surveys, leading to faster movement detection and reduced operational costs.
GEOSTRING uses MEMS sensors on a single cable to track ground movement in real-time. It’s affordable, easy to install, rugged, and reusable on several projects. Joints allow up to 90° bending for compact shipping.
Fiber optic sensors are highly accurate, immune to electromagnetic interference, safe in explosive environments, don’t require grounding, and maintain signal quality and real-time distributed measurement over long distances. A single cable can replace 50–80+ discrete sensors.
These solutions monitor tunnels, bridges, dams, ammonia and LNG pipelines, tailings dams, dikes, and embankments.
SOFO sensors are unique products for monitoring high-stakes structures including concrete buildings, bridges, and nuclear power plants. Their long-term reliability is proven through projects with 25+ years of continuous measurements.
Fiber optic systems can be integrated with various dataloggers or cloud platforms, streamlining data acquisition, management, and analytics across technologies including VW, and MEMS.
Pressuremeter tests work in most soils and rocks, providing in-situ stress-strain curves to estimate stiffness, strength, settlement, and foundation capacity. These tests suit projects where undisturbed samples or conventional tests are not possible or on larger projects where improved soil property information is warranted.
Follow ASTM D4719 guidelines for drilling to ensure the soil is not significantly disturbed thus affecting pressuremeter results. Rotary drilling with axial mud injection is especially versatile. Good results depend on careful adherence and monitoring using recommended indicators (E/Pl, Pl/Py ratios, shape of curve….).
Yes, up to 400 meters depth. However, the fluid-free section shouldn’t exceed about 150 meters. For depths beyond 200 meters, adjust the procedure and consult the instruction manual.
Initial saturation takes up to one hour with stainless steel filters, with later responses usually within seconds to minutes.
Yes, it blocks particles as small as 1 micron but takes up to 24 hours to reach equilibrium, compared to around 1 hour for stainless steel filters.
Installing more than two piezometers in a borehole is difficult using the standard method as bentonite pellets can stick to multiple cables in the BH and create restrictions. The fully grouted method is recommended for multiple installations.
Regular pressure readings are required. If measured pressure exceeds the sensor’s range, stop driving and wait for the pressure to dissipate.
Roctest does not recommend driving the piezometer to 20 meters depth. Usually, it should be driven only the last 0.5–1m of the borehole bottom.
Use in loose soils, ideally with SPT <10. Can be driven from a borehole. In harder soils, the piezometer may become over-pressurized or damaged. Refer to the manual for full guidelines.
Use ENERPAC HF-101 oil.
If pressure will not build above 8 MPa, there is a leak. Verify for external leaks first; if internal, the pump needs to be serviced by a hydraulic technician or sent back to Roctest for repair.
The cylinder effective area is 2.24 in² or 14.4 cm².
Geo-Lok can sustain up to 1% of settlement before the telescoping section is required.
Geo-Lok is compatible with most commercial inclinometer probes.
