Encardio-Rite - Products

Model EDS-63U/D Mechanical Borehole Extensometer System

Borehole extensometer mechanically measures deformation of rock mass and adjacent surrounding soil. It is available in 1-3 points suitable for a 76 mm borehole and 4-6 points suitable for a 102 mm borehole. The system comprises of anchors (groutable or packer), extension rods (stainless steel or fiber glass) in protective covering and a head assembly. A digital caliper/micrometer depth gage with a resolution of 0.01 mm is used to take readings.

Model EDS-70V/EDS-70P Borehole Extensometer System
with Electrical Assembly

The system is similar to EDS-63U/D excepting that the head assembly of EDS-70V incorporates vibrating wire displacement sensors (model EDE-VXX, range 50, 100 or 150 mm) and EDS-70P head assembly incorporates potentiometric displacement sensors (model EDE-PXX, range 50 or 150 mm). The electrical output can be transmitted over long distances through multicore cable. The readings can be taken with portable readout unit/data logger or through a remote automatic data acquisition system. This system is also available for use with mechanical readout devices.

Specifications:

Refer to EDE-VXX vibrating wire displacement sensor or EDE-PXX potentiometric displacement sensor for sensor specifications.

Model EMA-11 Measuring Anchor

EMA-11 measuring anchor, also known as rock bolt extensometer, is a combination of rock bolt and extensometer. It is used to determine load exerted on rock bolts. It is a precision instrument designed to evaluate anchor system forces and their distribution within the bolt and hence its safety and effectiveness. A digital caliper/micrometer depth gage with a resolution of 0.01 mm is used to take readings. An electrical head assembly consisting of four potentiometric sensors is optionally available for electrical output.

Specifications:
Length	3, 4, 6 m
Fixed points	4
Borehole diameter	51 mm
Anchor diameter	26.7 mm nominal
Loading capacity	250 kN
Electrical Measurement:
Range	± 5 mm
Resolution	0.01 mm
Linearity	0.1 % fs
Enclosure	IP 65

Model EDS-80 Tape Extensometer

EDS-80 tape extensometer is designed to measure small changes in distance between two reference points in any orientation, to give deformation of underground openings, excavations, tunnels, roof of a mine, movements of unstable slopes, etc. The readings are displayed on a 5 digit LCD display.

Specifications:
Tape length	30 m or 50 m
Precision in measurement of change	± 0.2 mm
LCD resolution	0.01 mm
Coefficient of linear expansion	11 ppm/° C (6.1 ppm/° F)

Model EDS-91 Magnetic Extensometer System

EDS-91 magnetic extensometer system measures settlement or heave in foundations, embankments, fills, excavations, etc. The system comprises of access tube, magnet assemblies and a portable magnetic probe with reed switch. The probe is inserted inside the access tube installed with magnet assemblies at various depths, to detect the change in position of the magnet assemblies due to vertical soil movement. Magnet assemblies suitable for inclinometer casing are also available. Plate/disc magnets are available for fills and spider magnets with 3 or 6 spiders for boreholes.

A similar system for monitoring horizontal displacement in embankments is available with a pull cable on reel and dead end pulley assembly.

Specifications:

Range 30, 50, 100, 150, 200, 300 m

Resolution 1 mm

Probe dimension 22 mm Ф 150 mm long

Access tube -PVC, 25 mm i.d., 34 mm o.d., 3 m long, fitted with `O’ rings at both ends, with telescopic couplings.

Model EDS-92 Soil Extensometer

EDS-92 soil extensometer is designed for monitoring of soil and rock movement in embankments and dams. The system consists of a specially mounted EDE-VXX vibrating wire displacement sensor installed inside telescopic protective tubing fixed between two anchor beams with connecting rods. Change in relative position between the anchor beams represents the deformation taking place and is measured by the displacement transducer.

Specifications:

Refer to EDE-VXX vibrating wire displacement sensor for sensor specifications.