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Geokon 4500HT, Instruction Manual, Page: 1 / 26

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Instruction Manual 

Model 4500HT 

High Temperature 

Vibrating Wire Piezometer 

 

 
 

 

 
 
 
 
 
 
 
 

No part of this instruction manual may be reproduced, by any means, without the written consent of Geokon, Inc. 

 

The information contained herein is believed to be accurate and reliable. However, Geokon, Inc. assumes no responsibility for 

errors, omissions, or misinterpretation. The information herein is subject to change without notification. 

 

Copyright © 2012-2018 by Geokon, Inc. 

(Doc Rev C 06/28/18)

Summary of Contents for 4500HT

Page 1: ...y any means without the written consent of Geokon Inc The information contained herein is believed to be accurate and reliable However Geokon Inc assumes no responsibility for errors omissions or misinterpretation The information herein is subject to change without notification Copyright 2012 2018 by Geokon Inc Doc Rev C 06 28 18 ...

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Page 3: ...re 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 Inc 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 of t...

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Page 5: ...ng the GK 405 5 5 3 GK 403 READOUT BOX OBSOLETE MODEL 6 5 3 1 Operating the GK 403 6 6 DATA REDUCTION 7 7 TROUBLESHOOTING 15 APPENDIX A SPECIFICATIONS 16 A 1 4500HT PIEZOMETER 16 A 2 MINERAL INSULATED CABLE 16 A 3 TUBULAR ENCAPSULATED CABLE TEC 16 APPENDIX B 4500HT 4 MM TO 4 MM CABLE SPLICE 17 B 1 TOOLS AND SUPPLIES 17 B 2 PROCEDURE 17 APPENDIX C SWAGELOK TUBE FITTING INSTRUCTIONS 19 C 1 INSTALLAT...

Page 6: ... CALIBRATION REPORT AT 200 C 13 FIGURE 10 TYPICAL CALIBRATION REPORT AT 250 C 14 FIGURE 11 TUBE INSERTION 19 FIGURE 12 MAKE A MARK AT SIX O CLOCK 19 FIGURE 13 TIGHTEN ONE AND ONE QUARTER TURNS 19 FIGURE 14 MARKS FOR REASSEMBLY 20 FIGURE 15 FERRULES SEATED AGAINST FITTING BODY 20 FIGURE 16 TIGHTEN NUT SLIGHTLY 20 TABLES TABLE 1 STANDARD PIEZOMETER WIRING 2 TABLE 2 HT VIBRATING WIRE PIEZOMETER SPECI...

Page 7: ... and frequency of vibration in the vibrating wire element The square of the vibration frequency is directly proportional to the pressure applied to the diaphragm A filter is used to keep out solid particles and prevent damage to the sensitive diaphragm Standard filters are 50 micron stainless steel Two coils one with a magnet insert the other with a pole piece insert are installed near the vibrati...

Page 8: ... Figure 1 with a connector a transition to a regular instrumentation cable Figure 2 or other termination as determined by the customer See Table 1 below for standard wiring Figure 1 Cable Inside Stainless Steel Tubing Figure 2 Stainless Steel Tubing with Transition to 02 250V6 Cable Function 02 156T Cable 02 187MI Cable Cables that transition to 02 250V6 cable Vibrating Wire Gage Red Red Red Vibra...

Page 9: ...ial readings with a portable readout box GK 403 or GK 404 Push the sensor into the borehole by whatever means are chosen This may include attachment to grout pipes special installation rods or other apparatuses being inserted into the borehole at the same time 5 TAKING READINGS The 4500HT is usually connected to a datalogger but for initial set up it is often more convenient to use a portable read...

Page 10: ...ck clips of the GK 404 1 flying leads are used for taking both the pressure reading and the temperature reading The white and green clips of the flying leads are not used with the 4500HT Make sure the shield drain wire is connected to the blue clip on the flying leads for both readings To take a pressure reading connect the red and black clips from the flying leads to the red and black leads of th...

Page 11: ...o the unit 2 Press the button labeled POWER ON BLUETOOTH 3 A blue light will begin blinking signifying that the Remote Module is waiting to connect to the handheld unit 4 Launch the GK 405 VWRA program handheld PC by tapping on Start then Programs and then the GK 405 VWRA icon 5 After a few seconds the blue light on the Remote Module should stop flashing and remain lit indicating that the remote m...

Page 12: ...ds to the unit 2 Turn the display selector to position B or F 3 Turn the unit on 4 The red and black clips of the GK 403 2 flying leads are used for taking both the pressure reading and the temperature reading The white and green clips of the flying leads are not used with the 4500HT Make sure the shield drain wire is connected to the blue clip on the flying leads for both readings 5 To take a pre...

Page 13: ...ensor using the output reading RT from the temperature sensor and the polynomial expression shown on the temperature gage calibration report 2 Use the temperature values and the zero pressure readings shown on the six calibration reports in an Excel spreadsheet to develop a polynomial that describes how the zero reading R0 varies with the temperature This polynomial will be supplied along with the...

Page 14: ...n 4 Gage Factor For example suppose that the reading on the temperature sensor RT is 8400 and the reading on the pressure transducer R1 is 6500 Then Temperature 194 1 C Zero Reading 8660 Gage Factor 0 0002282 From which Pressure 6500 8660 0 002282 0 493 MPa ...

Page 15: ...9 Figure 5 A Typical Model 4700 VW Temperature Sensor Calibration Report ...

Page 16: ...10 Figure 6 Typical Calibration Report at 25 C ...

Page 17: ...11 Figure 7 Typical Calibration Report at 100 C ...

Page 18: ...12 Figure 8 Typical Calibration Report at 150 C ...

Page 19: ...13 Figure 9 Typical Calibration Report at 200 C ...

Page 20: ...14 Figure 10 Typical Calibration Report at 250 C ...

Page 21: ...ors generators antennas or electrical cables Move the piezometer cable away from these sources if possible Contact the factory for information on available filtering and shielding equipment The Piezometer may have been damaged by overranging or shock Inspect the housing for damage The body of the Piezometer may be shorted to the shield Check the resistance between the shield drain wire and the Pie...

Page 22: ...on test apparatus 0 1 Contact Geokon for specific application information Notes Other ranges available on request 2 PSI kPa 0 14503 or MPa 145 03 3 Accuracy established under laboratory conditions 4 Please contact Geokon for dimensions of ranges higher than 10 MPa A 2 Mineral Insulated Cable Conductors 4 conductors 22 AWG solid copper Sheath Stainless Steel Sheath Wall 0 76 mm 0 03 Nominal O D 4 7...

Page 23: ...ing approximately 25 mm 1 from the ends of each cable Do NOT cut through the stainless steel casing 4 Use the vice grips to work that 25 mm 1 piece back and forth until it breaks from the main cable line Discard this piece and ensure there are no nicks in the sheathing of the internal signal wires 5 Strip the jacket off each of the four signal wires approximately 3 mm to 6 mm 0 12 to 0 24 on both ...

Page 24: ... it is approximately 270 degrees past finger tight See Appendix C for Swagelok instructions 13 Slide the other piece of the splice the one that has the 13 mm 1 2 Swagelok until it comes to a positive stop on the 13 mm 1 2 tube 14 Using the 5 mm and 23 mm 13 16 and 7 8 wrenches tighten the 13 mm 1 2 Swagelok 450 degrees past finger tight 15 Using the two 12 mm 0 5 wrenches tighten the remaining 4 m...

Page 25: ... as high safety factor systems further tighten the nut until the tube will not turn by hand or move axially in the fitting 3 Mark the nut at the six o clock position Figure 12 Make a Mark at Six O clock 4 While holding the fitting body steady tighten the nut one and one quarter turns until the mark is at the nine o clock position Note For 1 16 1 8 3 16 and 2 3 and 4 mm fittings tighten the nut thr...

Page 26: ... Inspect the ferrules for damage and replace if necessary If the ferrules are replaced the connector should be treated as a new assembly Refer to the section above for installation instructions 4 Reassemble the fitting by inserting the tube with preswaged ferrules into the fitting until the front ferrule seats against the fitting body Figure 15 Ferrules Seated Against Fitting Body 5 While holding ...

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