Geosense VWPHT-3600 Series Instruction Manual
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Geosense VWPHT-3600 Series Instruction Manual

High temperature vw piezometers
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V1.0 July 2020
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HIGH TEMPERATURE
VW PIEZOMETERS
VWPHT-3600

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Summary of Contents for Geosense VWPHT-3600 Series

  • Page 1 HIGH TEMPERATURE V1.0 July 2020 VW PIEZOMETERS VWPHT-3600...

  • Page 2: Table Of Contents

    V1.0 July 2020 CONTENTS Page 1.0 INTRODUCTION 1.1 General Description 1.2 Theory of operation 2.0 CONFORMITY 3.0 MARKINGS 4.0 DELIVERY 4.1 Packaging 4.2 Handling 4.3 Inspection 4.4 Storage 5.0 INSTALLATION 5.1 Zero Pressure Reading 5.2 Preparation for installation 6.0 DATA HANDLING 6.1 Monitoring the piezometer readings 6.1.1 Portable readouts 6.1.2 Data loggers...

  • Page 3: Introduction

    1.1 General Description ® Geosense VWPHT-3600 Series High Temperature Piezometers are suitable for the extreme environments of temperature and pressure found within applications such as geothermal heat and enhanced oil recovery systems including steam assisted gravity drainage (SAGD) and cyclic steam stimulation (CSS).
  • Page 4 (the sensing element) and at the other end to the inner ® body, all sealed into a stainless steel shell. The internal parts of all Geosense piezometers and transducers are identical. Only the thickness of the diaphragm, the geometry of the shell and the filter arrangements change.

  • Page 5: Conformity

    Email: info@geosense.co.uk, Web: www.geosense.co.uk. Declaration of Conformity ® ® We Geosense Ltd at above address declare under our sole responsibility that the Geosense products detailed below to which this declaration relates complies with protection requirements of the following harmonized EU Directives:- •...

  • Page 6: Markings

    V1.0 July 2020 3.0 MARKINGS ® Geosense VWPHT-3600 Series High Temperature Piezometers / Transducers are labelled with the following information:- Product Name Product Type Calibrated Operating Range Individual Serial Number Manufacturers Name & Address CE Mark THE POSITION OF LABELS MAY VARY ACCORDING TO THE CABLE REQUIREMENTS.

  • Page 7: Delivery

    Inappropriate handling techniques may cause damage to the packaging and the enclosed equipment. The packaging should be carefully inspected upon delivery and ® any damage MUST be reported to both the transportation company and Geosense 4.2 Handling Whilst they are a robust devices, VWPHT-3600 High Temperature Piezometers are precision measuring instruments.

  • Page 8: Storage

    +60 metres above sea level and barometric pressures change with altitude by approximately 1.2kPa per 100 metres. *however, copies may be obtained from Geosense, in case of loss The ‘CHECK Readings WILL be affected by temperature changes and slightly by changes in atmospheric pressure Calibration Sheets contain VITAL information about the piezometer.

  • Page 9: Installation

    V1.0 July 2020 5.0 INSTALLATION Installation will be dependent on the actual application and therefore should be installed in accordance with the project specification. Installation methods typically include attachment to grout pipes or special installation rods together with other items being installed simultaneously within the borehole.
  • Page 10 V1.0 July 2020 5.1 ZERO PRESSURE Reading contd... The ‘on-site’ ZERO PRESSURE readings for Vibrating Wire Piezometers and Transducers are obtained as follows: Fill a large bucket with clean, potable water, ideally at a temperature close to 20 C. Ensure that the bucket is away from any heat sources in an air temperature close to 20 C.

  • Page 11: Preparation For Installation

    V1.0 July 2020 Preparation for Installation Prior to installation of a piezometer / transducer, it is essential to establish and confirm details of the installation to be carried out. Some of the main considerations are listed below :- Intended elevation and depth for the Sensor This can be calculated as either the depth below a known level (ground level for example) or as the elevation with respect to a remote datum.
  • Page 12 V1.0 July 2020 (Continued from page 11) adds weight to the assembly to help with borehole installations. The filter bag should be fitted in advance of installation, filled with sand and allowed to soak in a bucket of water prior to placing. Bentonite seal Where a sealed piezometer filter zone is to be formed in a borehole, highly compressed and dehydrated Bentonite in the form of either pellets, balls or...

  • Page 13: Data Handling

    Specific operation manuals are supplied with each readout device. Below is a brief, step-by-step procedure for use with ® the Geosense VWR1 portable readout. Connect signal cable from the sensor to the readout following the wiring colour code.

  • Page 14: Data Reduction

    For most Vibrating Wire sensors, unique calibration factors are detailed on individual sensor calibration sheets. A unique calibration sheet is supplied with every ® Geosense Vibrating Wire Piezometer / Transducer. If the readout displays ‘Frequency’ values, (e.g. 2768.5 Hz) only a simple calculation is required to convert the readings to Linear Digits.
  • Page 15 As part of the routine calibration of the ‘High Temperature’ variant of the Vibrating Wire transducer / piezometer, Geosense subject each unit to a full range of thermal environments. The sensor is calibrated over its pressure range to establish a ‘Calibration Factor’...
  • Page 16 An instrument calibration sheet similar to the example in the Section 9 of this manual includes the following information: Model This refers to the Geosense model number. Serial Number This is a unique sensor identification number that can be found on the cable just behind the sensor body and, for long cables, at the end of the cable.
  • Page 17 V1.0 July 2020 (Continued from page 16) Calibration Factor for kPa @ 195 = (2.27232E-09*195 ) + (-2.00568E-06* (equation from Cal Sheet) ) + (1.98746E-04*195) - 1.80619 = - 1.82685 Current Reading in Hz = 7657.3 Hz Current Reading in Linear Digits = 5863.4 (calculated from Hz) Pressure Equation Water Pressure kPa = Calculated Factor x (Current Reading - Calculated Zero)

  • Page 18: Maintenance

    V1.0 July 2020 (Continued from page 17) could affect the performance of the filter and, therefore, the piezometer. It may be necessary to determine the nature of any build up, so that a suitable chemical compound can be sourced to dissolve the build up, without damaging the stainless steel of the body, filter and diaphragm.
  • Page 19 V1.0 July 2020...
  • Page 20 V1.0 July 2020 8.0 TROUBLESHOOTING contd… RESISTANCE DIAGNOSTICS Where damage to a sensor or cable is suspected this guide illustrates the way in which simple resistance checks can be taken to identify the possible cause of the problem. Resistance checks can be made with most types of multi-meter which are readily available in the market.
  • Page 21 V1.0 July 2020 8.0 TROUBLESHOOTING contd… RESISTANCE OF THE THERMISTOR STEP 1 Set the range to 20kΩ (or Ω if using a multi-meter which has automatic ranging). STEP 2 Connect the T+ (green) conductor to the red lead on the multi-meter and the T- (white) to the black lead on the multi-meter.
  • Page 22 V1.0 July 2020 8.0 TROUBLESHOOTING contd… Thermistor Linearization for VWPHT-3600 USING STEINHART & HART LOG Thermistor Type: 3K @25°C Resistance/ temperature equation:- T= (1 / (A + B (LnR) + C(LnR) )) –273.2 Where:- T = Temperature in degrees Centigrade LnR= Natural log of Thermistor resistance.
  • Page 23 V1.0 July 2020 8.0 TROUBLESHOOTING contd… Thermistor Linearization for VWPHT-3600 Thermistor Type: 3K @25°C Resistance versus temperature table...
  • Page 24 V1.0 July 2020 8.0 TROUBLESHOOTING contd… Thermistor Linearization for VWPHT-3610 Thermistor Type: 10K @25°C Resistance versus temperature table Temperature Resistance Temperature Resistance Temperature Resistance (kΩ) (kΩ) (kΩ) 28.44 6.103 1.865 27.19 1.814 5.897 26.01 5.698 1.764 24.89 5.507 1.715 23.82 5.323 1.668 22.80...
  • Page 25 V1.0 July 2020 8.0 TROUBLESHOOTING contd… Thermistor Linearization for VWPHT-3610 Thermistor Type: 10K @25°C Resistance versus temperature table Temperature Resistance Temperature Resistance Temperature Resistance (kΩ) (kΩ) (kΩ) 0.6945 0.1310 0.2817 0.6777 0.1286 0.2758 0.6614 0.1262 0.2699 0.6455 0.1238 0.2642 0.6301 0.1216 0.2587 0.6152...
  • Page 26 V1.0 July 2020 8.0 TROUBLESHOOTING contd… Thermistor Linearization for VWPHT-3610 Thermistor Type: 10K @25°C Resistance versus temperature table Temperature Resistance (kΩ) 0.06694 0.06584 0.06476 0.06371 0.06267 0.06166 0.06067 0.05969 0.05874 0.05780 0.05689 0.05598 0.05510 0.05423 0.05337 0.05254 0.05172 0.05091 0.05013 0.04935 0.04860...
  • Page 27 V1.0 July 2020 8.0 TROUBLESHOOTING contd… RESISTANCE OF ALL INDIVIDUAL CONDUCTORS STEP 1 Set the range to 20kΩ or Ω if using a multi-meter which has automatic ranging. STEP 2 Both pairs of conductors should be checked by connecting them to the red and black leads on the multi-meter as follows:- Red to Red / Black to Black Red to Green / Black to White...

  • Page 28: Specification

    V1.0 July 2020 9.0 SPECIFICATION SENSOR Pressure range MPa 2.1, 3.5, 5.2, 6.9, 10.4, 13.8, 20.7, 34.5 Calibration range VWPHT-3600 + 20 to + 200°C, Calibration range VWPHT-3610 +20 to + 250°C Operating range VWPHT-3600 0 to + 200°C Operating temperature VWPHT-3610 0 to + 250°C Thermistor type VWPHT-3600 Thermistor type VWPHT-3610...

  • Page 29: Calibration

    V1.0 July 2020 10.0 CALIBRATION...

  • Page 30: Spare Parts

    Part number Description G1025 LAE (Low Air Entry) Stainless Steel filter assembly Geosense can provide the following parts that may be required to effect repairs to instrument cables: TEC cable 4 core cable • PU coated 4 Core cable with foil shield and copper drain.

  • Page 31: Return Of Goods

    12.4 Packaging and Carriage All used goods shipped to the factory must be sealed inside a clean plastic bag and ® packed in a suitable carton. If the original packaging is not available, Geosense should ® be contacted for advice. Geosense will not be responsible for damage resulting from inadequate returns packaging or contamination under any circumstances.

  • Page 32: Limited Warranty

    V1.0 July 2020 12.0 LIMITED WARRANTY The manufacturer, (Geosense Ltd), warrants the VWPHT-3600 Vibrating Wire Piezometers manufactured by it, under normal use and service, to be free from defects in material and workmanship under the following terms and conditions:- ®...
  • Page 33 V1.0 July 2020...

This manual is also suitable for:

Vwpht-3600Vwpht-3610

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