Users’ Manual
EDS-71V/P Single point borehole extensometer
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2
Dimensional details of sensor
Displacement
Overall length of VW sensor
(in closed position)
Overall length of Pot. sensor
(in closed position)
50 mm
290 mm
325 mm
100 mm
420 mm
425 mm
150 mm
550 mm
525 mm
The sensor shaft is fixed to female thread in connecting rod through a sensor lock nut (18), link plate (16),
sensor tightening nut (17) and a reference button (15) - refer to figures 2.1 and 2.2. The outside body of
sensor is fixed to a adopter cum guide plate (6) in the flanged housing at the face of the borehole. The
system is rugged and is protected by a protecting cover (19). Flange assembly (5) .Nipple is an integral
part of flanged housing (22) through which cable for sensors can be taken to a junction box (23) and then
through a multi-core cable to any distant location.
NOTE:
Encardio-rite uses the convention that depth of anchor is calculated as the distance from the
mouth of hole to near end of anchor.
CAUTION:
Never rotate shaft of displacement sensor in respect to the outside body. This will permanently
damage the sensor. During installation pull / push or pull shaft only axially. A pin has been
provided at the end of displacement sensor that sits flush in a groove in sensor body. During
assembly operation and while using spanners for tightening, keep sensor in closed position
with pin seated inside groove such that no torque is exerted on its shaft and there is no
rotational movement.
1.3 Conventions used in this manual
WARNING!
Warning messages calls attention to a procedure or practice, that if not properly followed
could possibly cause personal injury.
CAUTION:
Caution messages calls attention to a procedure or practice, that if not properly followed may
result in loss of data or damage to equipment.
NOTE:
Note contains important information and is set off from regular text to draw the users’ attention.
1.4 How to use this manual
The users’ manual is intended to provide sufficient information for making optimum use of borehole
extensometers in different applications.
To make the manual more useful we invite valuable comments and suggestions regarding any additions
or enhancements. We also request to please let us know of any errors that are found while going through
this manual.
NOTE:
The installation personnel must have a background of good installation practices and
knowledge of the fundamentals of geotechnics. Novices may find it very difficult to carry on
the installation work. The intricacies involved in installation are such that even if a single
essential but apparently minor requirement is ignored or overlooked, the most reliable of
instruments will be rendered useless.
A lot of effort has gone in preparing this instruction manual. However the best of instruction
manuals cannot provide for each and every condition in the field, which may affect the
performance of the instrument. Also, blindly following the instruction manual will not guarantee
success. Sometimes, depending upon field conditions, the installation personnel will have to
consciously depart from the written text and use their knowledge and common sense to find
the solution to a particular problem.
