ALAT UJI JM Series Instruction Manual

Vibrating wire displacement transducers

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VIBRATING WIRE DISPLACEMENT TRANSDUCERS

Office: Jl. Radin Inten II No. 62 Duren Sawit, Jakarta 13440 - Indonesia

Workshop: Jl. Pahlawan Revolusi No. 22B, Jakarta 13430 - Indonesia

Phone: 021-8690 6777 (Hunting)

NSTRUCTION

JM Series

ANUAL

Mobile: +62 816 1740 8925

Fax: 021-8690 6771

Fax: 021-8690 6777

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Summary of Contents for ALAT UJI JM Series

Page 1 NSTRUCTION ANUAL VIBRATING WIRE DISPLACEMENT TRANSDUCERS JM Series Mobile: +62 816 1740 8925 Office: Jl. Radin Inten II No. 62 Duren Sawit, Jakarta 13440 - Indonesia Workshop: Jl. Pahlawan Revolusi No. 22B, Jakarta 13430 - Indonesia Fax: 021-8690 6777 Fax: 021-8690 6771...
Page 2: Table Of Contents
TABLE OF CONTENTS GENERAL DESCRIPTION ..................1 INSTALLATION ....................... 1 Preliminary tests ....................1 Displacement Transducer Installation ..............2 JM-S – Crackmeter ..................2 2.2.1 JM-E – Embedment jointmeter ..............3 2.2.2 JM-T – Displacement transducer ..............3 2.2.3 2.2.4 Dimensions ....................
Page 3: General Description
E1057C-140422 1 GENERAL DESCRIPTION The JM-Series jointmeter is used to measure movements such as:  the opening or closing of cracks in dams, bridges, etc  the amount of opening of contraction joints in concrete dams, or interfaces between rock and concrete The jointmeter, depending on the model, can be either embedded or surface mounted, or integrated into a borehole extensometer.
Page 4: Displacement Transducer Installation
E1057C-140422 2.2 DISPLACEMENT TRANSDUCER INSTALLATION 2.2.1 JM-S – CRACKMETER The threaded rods at each end of the JM can be connected to the rebar anchors for injection or to expandable anchors. The threaded rods can even be used directly to fix the JM to a metal structure in which two holes have previously been made.
Page 5: Jm-E - Embedment Jointmeter
E1057C-140422 2.2.2 JM-E – EMBEDMENT JOINTMETER The JM-E embedment jointmeter consists of 2 parts: the socket and the gage by itself. The socket is installed in the first lift of concrete. The finished face of the socket must be accessible for installing the gage on the second lift. There is a protective plug with a 5/16”...
Page 6: Dimensions
E1057C-140422 2.2.4 DIMENSIONS Dimensions to take into considerations when installing any JM are given in table below: Extent of measurement in mm Model Position Start 214.5 270 JM-T Length (A) Mid range 1014 (without (mm) joint) 239.5 320 1164 Start JM-S Length (A) Mid range...
Page 7 E1057C-140422 The reading station comes with a cord that has 4 alligator clips at one end. Connect the alligator clips to the gauge according to the following table. Cables IRC-41A and IRC-390 Color of the clip Sensor cable Coil (+) Coil (-) Black Black...
Page 8 E1057C-140422   where = relative displacement in millimetres = current reading in millimetres = initial reading in millimetres If the frequency is measured, convert it into LINEAR units using the following equation: L = k (F / 1000) where = reading in LU = gage constant for displacement transducer = 1.00 = frequency in Hz...
Page 9: Troubleshooting
E1057C-140422 Effect of temperature: Each JM is provided with a thermistor. The following formula is used to perform compensation for the effect of temperature on the sensor:     where = relative displacement in millimetres = actual reading in millimetres = initial reading in millimetres = thermal coefficient of sensor in mm/ = actual temperature in degree Celsius...
Page 10: No Reading
E1057C-140422 - Isolate the readout unit from the ground by placing it on a piece of wood or similar non-conductive material. - Check the battery of the readout unit. - Check for nearby sources of electrical noise such as motors, generators, electrical cables or antennas.
Page 11: Conversion Table (Temperature)
E1057C-140422 5 CONVERSION TABLE (TEMPERATURE) Temp. Types of resistances Temp. Types of resistances 201100 670500 6208 9310 31030 187300 670500 5900 8851 29500 174500 624300 5612 8417 28060 162700 581700 5336 8006 26690 151700 542200 5080 7618 25400 141600 440800 4836 7252 24170...
Page 12 E1057C-140422 Types de résistances Types de résistances Temp. Temp. 1002 3340 192.2 640.3 965.0 3217 186.8 622.1 929.6 3099 181.5 604.4 895.8 2986 176.4 587.5 863.3 2878 171.4 571.0 832.2 2774 166.7 555.1 802.3 2675 162.0 540.0 773.7 2580 157.6 524.9 746.3 2488...

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