ENCARDIO RITE EDS-71P User Manual Download Page 1

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BOREHOLE EXTENSOMETER

SYSTEM (BHE) WITH VIBRATING

WIRE/ POTENTIOMETRIC SENSORS

MODEL EDS-71V/P

ENCARDIO-RITE ELECTRONICS PVT. LTD.

A-7, Industrial Estate, Talkatora Road Lucknow, UP - 226011, India | P: +91 522 2661039-42 | Email: [email protected] | www.encardio.com

Doc. # WI 6002.99 R00 | Jun 2011

ONE STOP MONITORING SOLUTIONS | HYDROLOGY | GEOTECHNICAL | STRUCTURAL | GEODETIC

Over 50 years of excellence through ingenuity

USERS’ MANUAL

Summary of Contents for EDS-71P

Page 1: ...ucknow UP 226011 India P 91 522 2661039 42 Email geotech encardio com www encardio com International UAE Qatar Bahrain Bhutan Europe USA India Lucknow Delhi Kolkata Mumbai Chennai Bangalore Hyderabad...

Page 2: ...REHOLE EXTENSOMETER BHE 4 2 1 General Description 4 2 1 1 Reference head assembly 4 2 1 2 Displacement sensor 4 2 1 3 Connecting rod assembly 6 2 1 4 Anchor 7 2 2 Accessories 8 2 2 1 Junction box 8 2...

Page 3: ...ential roof or wall falls before they actually occur Roof or wall falls in underground cavities are almost invariably preceded by measurable sags as the strata opens up and the movement usually occurs...

Page 4: ...his 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 procedur...

Page 5: ...he end to get a thorough grasp of the subject You will find a lot of unexpected information in the sections you feel you may skip For description of vibrating wire borehole extensometers manufactured...

Page 6: ...BHE reference head assembly Reference head assembly is supplied packed from factory as per items listed in figure 2 1 The sensor is separately supplied but it is very convenient to assemble it at sit...

Page 7: ...r Junction box assembly Reference button Reference plate Sensor lock nut Sensor tightening nut Link plate Center pillar 17 19 18 21 23 20 Cover 16 15 14 13 22 Nipple with chuck nut Grub screw M4x5 8 b...

Page 8: ...d to downward holes This is because in vertically upward holes the connecting rod is in tension whereas in downward holes it is in compression resulting in sagging or buckling Longer the extensometer...

Page 9: ...in flanged housing its face extends around 20 mm beyond rubber bush 10 Proper sealing in reference head assembly is especially necessary for upwards to horizontally slanting holes for preventing any...

Page 10: ...nsor to the observation room Alternatively a junction box is available for termination of cable from sensor and transmitting the signal through a multi core cable to the observation room 2 2 2 Cable F...

Page 11: ...oth strips soaked in cement during installation 3 1 3 Insert reference head assembly centralised in the 63 mm borehole Taking holes on flange as reference drill four holes 12 mm diameter x 125 mm deep...

Page 12: ...21 4 6821 4 6823 40 05 39 99 50 00 7947 7 7947 7 7946 0 7947 50 00 50 01 Error fs 0 23 0 03 Digit f X 10E 3 Linear gage factor G 8 848E 03 mm digit Thermal factor K 0 003 mm C Polynomial constants A 1...

Page 13: ...9150 1 9150 48 00 0 00 Max error FS 0 16 Linear gage factor G 25 83 mm Volts Displacement D is calculated with the following equation Linear D mm G R1 R0 R1 current reading R0 is initial reading in V...

Page 14: ...le lowest end of grout tube is tied with a cable tie to the connecting rod NOTE In upward to horizontally sloping borehole grout tube should be about 2 m longer than specified depth of anchor and tape...

Page 15: ...ss rod is supplied in coil form using cable ties It is very stiff material and must be carefully handled when unwinding as the end may snap back and cause personal injury 3 3 8 Guide end of fibreglass...

Page 16: ...nsion can be monitored In other words if only compression is expected set zero reading of sensor by extending shaft by around 10 mm If only extension is expected set zero reading of sensor by extendin...

Page 17: ...out pipe to grouting machine or pump grout till the entire cavity is filled and grout flows out of air vent pipe Be very careful that grout flowing out of air vent tube does not get into the flanged h...

Page 18: ...sensor to connecting rod clearly noting position of extensometer 1 CAUTION Never rotate shaft of displacement sensor in respect to the outside body This will permanently damage the sensor During inst...

Page 19: ...nstallation of the multi position borehole extensometer 3 4 1 Soldering iron 25 watt 3 4 2 Rosin 63 37 solder wire 3 4 3 Thread sealant Loctite 290 or equivalent 3 4 4 Cable jointing compound 3 4 5 Ac...