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Geokon 4500HT Series Instruction Manual

High temperature vibrating wire piezometer
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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, 2013 by Geokon, Inc.
(Doc Rev A 6/13)

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Summary of Contents for Geokon 4500HT Series

  • Page 1 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.
  • Page 3 The buyer's sole remedy for any breach of this agreement by Geokon, Inc. or any breach of any warranty by Geokon, Inc. shall not exceed the purchase price paid by the purchaser to Geokon, Inc. for the unit or units, or equipment directly affected by such breach.

  • Page 5: Table Of Contents

    TABLE of CONTENTS 1. INTRODUCTION ............................ 1 2. PRINCIPLE OF OPERATION ......................1 3 INSTALLATION ............................2 3.1 P ..........................2 RELIMINARY ESTS ............................3 ABLES 3.3 I ......................4 NSTALLATION IN OREHOLES TAKING READINGS ........................... 4 4.1 W ..........................4 IRING IAGRAM 4.2 O...

  • Page 7: Introduction

    1. INTRODUCTION Geokon’s 4500HT Series High Temperature Piezometers and Pressure Transducers are designed for monitoring downhole pressures and temperatures in oil recovery systems and geothermal applications. These sensors are capable of operation under extreme conditions and at temperatures up to 250°C. In thermal recovery applications (steam assisted gravity drainage (SAGD)

  • Page 8: Installation

    Portable readout units are available to provide the excitation, signal conditioning and readout of the instrument. Datalogging systems are also available for remote unattended data collection of multiple sensors. Contact Geokon for additional information. Calibration data are supplied with each piezometer for conversion of gage readings to engineering units and for temperature corrections see Section 5.

  • Page 9: Cables

    3.2 Cables The 4500HT Series are delivered with either mineral insulated cables (4 solid, 22 gage ® copper conductors in magnesium oxide inside a 316 stainless steel tube), or with Teflon insulated cables inside stainless steel tubing with couplings or Teflon insulated conductors in a continuous stainless steel tube.

  • Page 10: Installation In Boreholes

    3.3 Installation in Boreholes Before installing make sure both pressure and temperature sensors are working and record initial 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.

  • Page 11: Operation Of The Gk-404 Readout Box

    2. Turn the unit on and a reading will appear in the front display window. The last digit may change one or two digits while reading. Press the "Store" button to record the value displayed. If the no reading displays or the reading is unstable see section 5 for troubleshooting suggestions.

  • Page 12: Operation Of The Gk-405 Readout Box

    4.4 Operation of the GK-405 Readout Box The GK-405 Vibrating Wire Readout is made up of two components:  the Readout Unit, consisting of a Windows Mobile handheld PC running the GK-405 Vibrating Wire Readout Application  the GK-405 Remote Module which is housed in a weather-proof enclosure and connects to the vibrating wire sensor by means of: 1) Flying leads with alligator type clips when the sensor cable terminates in bare wires 2) by means of a 10 pin connector..

  • Page 13: Measuring Temperatures

    4.5 Measuring Temperatures Each 4500HT pressure transducer is equipped with a Model 4700 vibrating wire temperature sensor connected to the white and green leads. A Typical Calibration Sheet is Shown on page 9 5. DATA REDUCTION The Model 4500HT pressure transducer incorporates a Model 4700 thermometer – both sensors operating on the vibrating wire principle.
  • Page 14 3. Use temperature values and the linear gage factors shown on the six calibration sheets in an Excel spreadsheet to develop a polynomial that describes how the gage factor, G, varies with the temperature. (This polynomial will be supplied along with the cal sheets).
  • Page 16 Figure 4 A Typical Model 4700 VW Temperature Sensor Calibration Sheet Figure 5 Typical Calibration Sheet at 25°C...
  • Page 17 Figure 6 Typical Calibration Sheet at100°C...
  • Page 18 Figure 7 Typical Calibration Sheet at 150°C...
  • Page 19 Figure 8 Typical Calibration Sheet at 200°C...
  • Page 20 Figure 9 Typical Calibration Sheet at 250°C...

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