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13 

6. TROUBLESHOOTING 

 

Consult the following list of problems and possible solutions should difficulties arise. Consult 

the factory for additional troubleshooting help. 

 

Symptom: Displacement Transducer Readings are Unstable 

 

  Is the readout box position set correctly? If using a datalogger to record readings 

automatically are the swept frequency excitation settings correct? Try reading the displacement 

transducer on a different readout position. 

  Is there a source of electrical noise nearby? Most probable sources of electrical noise are 

motors, generators, transformers, arc welders and antennas. Make sure the shield drain wire is 

connected to ground whether using a portable readout or datalogger. If using the GK-403, GK-

404 or GK-405 connect the clip with the blue boot to the shield drain wire. (Green for the GK-

401.) 

  Does the readout work with another displacement transducer? If not, the readout might have 

a low battery or be malfunctioning. Consult the appropriate readout manual for charging or 

troubleshooting directions. 

  Has the transducer gone outside its range? If so, the transducer can be reset using the 

installation instructions in Section 3. 

 

Symptom: Displacement Transducer Fails to Read 

 

  Is the cable cut or crushed? This can be checked with an ohmmeter. Nominal resistance 

between the two gauge leads (usually red and black leads) is 180

Ω

, 

±

10

Ω

. Remember to add 

cable resistance when checking (22 AWG stranded copper leads are approximately 14.7

Ω

/1000 

ft. or 48.5

Ω

/km, multiply by two for both directions). If the resistance reads infinite, or very high 

(megohms), a cut wire must be suspected. If the resistance reads very low (

<

100

Ω

) a short in the 

cable is likely. 

  Does the readout or datalogger work with another transducer? If not, the readout or 

datalogger might be malfunctioning. Consult the readout or datalogger manual for further 

direction. 

Содержание 4427

Страница 1: ...y any means without the written consent of Geokon The information contained herein is believed to be accurate and reliable However Geokon assumes no responsibility for errors omissions or misinterpretation The information herein is subject to change without notification Copyright 2003 2019 by Geokon Doc Rev L 05 31 19 ...

Страница 2: ......

Страница 3: ...nnel There are no warranties except as stated herein There are no other warranties expressed or implied including but not limited to the implied warranties of merchantability and of fitness for a particular purpose Geokon is not responsible for any damages or losses caused to other equipment whether direct indirect incidental special or consequential which the purchaser may experience as a result ...

Страница 4: ......

Страница 5: ... BOX OBSOLETE MODEL 9 4 3 1 Connecting Sensors with 10 pin Bulkhead Connectors Attached 9 4 3 2 Connecting Sensors with Bare Leads 9 4 3 3 Operating the GK 403 9 4 4 MEASURING TEMPERATURES 9 5 DATA REDUCTION 10 5 1 DISPLACEMENT CALCULATION 10 5 2 TEMPERATURE CORRECTION 10 5 2 1 The Transducer Alone 10 5 2 2 The Extension Cable 11 5 3 ENVIRONMENTAL FACTORS 12 6 TROUBLESHOOTING 13 APPENDIX A SPECIFI...

Страница 6: ... CALIBRATION REPORT FOR MODEL 4427 LONG RANGE DISPLACEMENT TRANSDUCER 16 FIGURE 10 TYPICAL CALIBRATION REPORT FOR MODEL 4400 DISPLACEMENT TRANSDUCER 17 TABLES TABLE 1 THERMAL COEFFICIENTS 11 TABLE 2 MODEL 4450 DISPLACEMENT TRANSDUCER SPECIFICATIONS 14 TABLE 3 THERMISTOR RESISTANCE VERSUS TEMPERATURE 15 EQUATIONS EQUATION 1 DIGITS CALCULATION 10 EQUATION 2 DISPLACEMENT CALCULATION 10 EQUATION 3 THE...

Страница 7: ...splacement Meter LRDM is designed to measure displacements of up to two meters magnitude between two points Typical applications include the monitoring of crack openings due to mining and the monitoring of unstable slopes Figure 1 4427 Internal Mechanism ...

Страница 8: ...ored The enclosure has a gasketed hinged cover and is mounted on a three inch threaded PVC pipe flange which will mate with a three inch pipe designed to be installed and grouted inside a borehole drilled perpendicular to the slope This standpipe can be provided by the installer or is available at Geokon Also included with the enclosure is a weak link for attachment between the tensioned aircraft ...

Страница 9: ... possible the readout enclosure can be mounted on a pedestal Here the Transducer Enclosure is bolted to a steel Mounting Plate which is then bolted to a flat surface measuring approximately nine inch square Ideally the plane of this surface should be inclined to be parallel to the plane of the extension wire in the case of measurements down a slope this would mean parallel to the slope Once this s...

Страница 10: ...Using the snap swivel hooks the ends of the weak link hook the weak link onto the extension cable loop and on to the end loop of the cable wound on the drum in the enclosure Adjust the extension cable length by pulling cable through the two cable clamps until the wire is tight and the wire tension is taken by the drum Connect the readout cable to the readout box Pull approximately four inches of c...

Страница 11: ...Geokon dataloggers and readouts should difficulties arise 3 6 Lightning Protection The Model 4427 Vibrating Wire Long Range Displacement Meter can be supplied with integral lightning protection components i e transzorbs or plasma surge arrestors If the instrument cable is exposed it might be appropriate to install lightning protection components as the transient could travel down the cable to the ...

Страница 12: ...om the gauge As shown in Figure 6 Alternatively plasma surge arrestors can be included inside the enclosure close to the sensor A ground strap would connect the surge arrestor to earth ground either a grounding stake or other suitable earth ground Consult the factory for additional information on these or alternate lightning protection schemes Terminal Box Multiplexer Instrument Cable LAB 3 Enclos...

Страница 13: ...rs with blue representing the shield bare To turn the GK 404 on press the ON OFF button on the front panel of the unit The initial startup screen will be displayed After approximately one second the GK 404 will start taking readings and display them based on the settings of the POS and MODE buttons The unit display from left to right is as follows The current Position Set by the POS button display...

Страница 14: ... it locks into place 4 2 2 Sensors with Bare Leads Attach the GK 403 2 flying leads to the bare leads of a Geokon vibrating wire sensor by connecting each of the clips on the leads to the matching colors of the sensor conductors with blue representing the shield bare 4 2 3 Operating the GK 405 Press the button labeled POWER ON A blue light will begin blinking signifying that the Remote Module is w...

Страница 15: ... change one or two digits while reading 4 The thermistor reading will be displayed above the gauge reading in degrees centigrade 5 Press the Store button to record the value displayed If the no reading displays or the reading is unstable see Section 6 for troubleshooting suggestions The unit will automatically turn off after approximately two minutes to conserve power 4 4 Measuring Temperatures Al...

Страница 16: ...readout the initial reading should be around 3000 digits R1 is a subsequent reading F is the linear gauge factor in mm or inches per digit taken from the model 4427 calibration report supplied with the equipment Figure 9 in Appendix C 1 shows a typical model 4427 long range displacement transducer calibration report For example If R0 3083 digits R1 4228 F 0 2223 mm digit Then Displacement 4228 308...

Страница 17: ...nt transducer calibration report Tests have determined that the thermal coefficient K changes with the position of the transducer shaft The first step in the temperature correction process is determination of the proper thermal coefficient based on the following equation K MR1 B Equation 4 Thermal Coefficient Calculation Where R1 is the current reading M is the multiplier from Table 1 B is the con...

Страница 18: ...rded Seemingly minor effects can have a real influence on the behavior of the situation being monitored and may give an early indication of potential problems Some of these factors include but are not limited to blasting rainfall tidal levels excavation and fill levels and sequences traffic temperature and barometric changes changes in personnel nearby construction activities seasonal changes etc ...

Страница 19: ...s the readout work with another displacement transducer If not the readout might have a low battery or be malfunctioning Consult the appropriate readout manual for charging or troubleshooting directions Has the transducer gone outside its range If so the transducer can be reset using the installation instructions in Section 3 Symptom Displacement Transducer Fails to Read Is the cable cut or crushe...

Страница 20: ...8 Kgm Dimensions Enclosure 590 x 150 x 150 mm Temperature Range 40 to 80 degrees C Weight 13 Kgm Frequency Range standard model 1200 2800 Hz Coil Resistance 180 Ω 10 Ω Cable Type Two twisted pair four conductor 22 AWG Foil shield PVC jacket1 nominal OD 6 3 mm 0 250 Table 2 Model 4450 Displacement Transducer Specifications Notes 1 Polyurethane jacket cable available A 2 Thermistor see Appendix B al...

Страница 21: ... 2 83 107 9 123 77 66K 36 8006 4 1363 44 331 5 84 105 2 124 72 81K 35 7618 5 1310 45 321 2 85 102 5 125 68 30K 34 7252 6 1260 46 311 3 86 99 9 126 64 09K 33 6905 7 1212 47 301 7 87 97 3 127 60 17K 32 6576 8 1167 48 292 4 88 94 9 128 56 51K 31 6265 9 1123 49 283 5 89 92 5 129 53 10K 30 5971 10 1081 50 274 9 90 90 2 130 49 91K 29 5692 11 1040 51 266 6 91 87 9 131 46 94K 28 5427 12 1002 52 258 6 92 8...

Страница 22: ...16 APPENDIX C TYPICAL CALIBRATION REPORTS C 1 Model 4427 Calibration Report Figure 9 Typical Calibration Report for Model 4427 Long Range Displacement Transducer ...

Страница 23: ...17 C 2 Model 4400 Calibration Report Figure 10 Typical Calibration Report for Model 4400 Displacement Transducer ...

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