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Geokon 8020-59 Instruction Manual

Vibrating wire to analog converter
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Instruction Manual
Model 8020-59
Vibrating Wire to Analog Converter
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 © 2006 – 2018 by Geokon, Inc.
(Doc Rev J, 05/18/2018

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Summary of Contents for Geokon 8020-59

  • Page 1 Vibrating Wire to Analog Converter 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 Upon examination by Geokon, if the unit is found to be defective, it will be repaired or replaced at no charge. However, the WARRANTY is VOID if the unit shows evidence of having been tampered with...

  • Page 4: Table Of Contents

    TABLE of CONTENTS 1. INTRODUCTION ..............................1 2. INSTALLING AND CONFIGURING THE 8020-59 SOFTWARE APPLICATION ........2 2.1 C COM P ........................... 5 ONFIGURING THE 3. QUICK START (SINGLE CHANNEL) ....................... 7 4. SINGLE AND MULTI-CHANNEL OPERATION ....................10 4.1 T .............................10...
  • Page 5 IGURE NSTALL IZARD NSTALLATION OMPLETE 8 - I 8020-59 A ..................5 IGURE NSTALL IZARD AUNCH PPLICATION 9 - 8020-59 S .................. 5 IGURE OFTWARE PPLICATION TARTUP IALOG 10 - C ....................6 IGURE OMMUNICATIONS ARAMETERS IALOG 11 - S ....................
  • Page 6 TABLES 1 - C ..................1 ABLE ONNECTOR INOUT AND IGNAL ESCRIPTION 2 - T ..................28 ABLE HERMISTOR ESISTANCE ERSUS EMPERATURE 3 - E ..................42 ABLE NGINEERING NITS ULTIPLICATION ACTORS EQUATIONS 1 - V ................14 QUATION IBRATING REQUENCY TO IGITS ONVERSION 2 - A ........................14...

  • Page 7: Introduction

    1. INTRODUCTION The Model 8020-59 Vibrating Wire (VW) to Analog Converter is a low cost module that provides a simple way to connect Geokon’s vibrating wire transducers to data acquisition systems that are not capable of reading frequency signals nor able to generate the proper signals required to excite VW transducers.

  • Page 8: Installing And Configuring The 8020-59 Software Application

    APPLICATION A free setup and configuration application is available for download on Geokon’s website, providing a user-friendly way to set up the 8020-59 VW to Analog Converter. Follow the steps below to install the software: 1) After downloading the installer from the Geokon website, right-click on the zip file, “8020- 59_setup.zip”, and select “Extract All…”...

  • Page 9: Figure 3 - Extracted 8020-59 Installer

    Figure 3 - Extracted 8020-59 Installer 4) After a few moments, the dialog shown in Figure 4 will be displayed. Figure 4 - Install Wizard, Start Screen 5) After clicking on the “Next >” button, the dialog shown in Figure 5 is displayed.

  • Page 10: Figure 6 - Install Wizard, Choose Start Menu Folder

    6) Choose whether to install the 8020-59 Software Application for all users or just for the current user (see Figure 5). NOTE: Without administrative privileges on the PC, the only option allowed will be “Install just for me”. After making a selection, click “Next >”; this will bring up the dialog shown in Figure 6.

  • Page 11: Configuring The Com Port

    After launching the 8020-59 Software Application, the first thing that must be done is to configure the COM Port. Click on the “Com Setup” (or press the “Alt” and the “c” key at the same time) to select a COM port for communication with the 8020-59 VW to Analog Converter (See Figure 9).

  • Page 12: Figure 10 - Communications Parameters Dialog

    (such as COM1) or an external one via a USB to Serial Converter (see Figure 10). Some newer PCs are so fast that a small delay between characters is needed to give the 8020-59 time to process the characters. The “Inter-character Delay” is specified in milliseconds.

  • Page 13: Quick Start (Single Channel)

    VW Transducer VW Transducer Calibration Report 1) Install the 8020-59 software on the PC that will be used to interface to the 8020-59 unit (see Section 2). 2) Connect the 8020-59 to the computer’s serial port (typically COM1). If using an external USB to Serial converter, drivers for this device will need to be installed before this step (see Section 2.1).

  • Page 14: Figure 11 - Single Channel Configuration Screen

    “Do you want to upload the current settings to the 8020-59?”. Click the “Yes” button. The Single Channel Monitor screen should now appear (see Figure 12), and after several seconds should update with a reading.
  • Page 15 See Appendix D for further information on Data Reduction. 12) Click “Exit” (or press the “Alt” and “e” keys) to return to the Setup Screen. After setup is complete, the PC is disconnected from the 8020-59 and the sensor is in a pressurized state, the “Current Reading” (R ) “Digits”...

  • Page 16: Single And Multi-Channel Operation

    Acquisition System to select either 1 of 16 or 1 of 32 transducers. The 8020-59 was developed with multiplexing in mind and uses the same control signals as the Geokon model 8032 Vibrating Wire Multiplexer (for control signal timing requirements, refer to the model 8032 Multiplexer Instruction Manual).

  • Page 17: Operating Modes

    4.2 Operating Modes The 8020-59 has three modes of operation: single channel mode, 16-Channel mode, and 32- Channel mode. Each operation mode is detailed in the subsections below. 4.2.1 Single Channel Mode In this mode (Figure 13), the 8020-59 will maintain continuous excitation of the VW transducer and provide a continuous 0-5V and 4-20mA output to the host DAS, updated approximately every second.

  • Page 18: 16-Channel Multiplexed Mode

    When the final transducer has been read, the host DAS brings CLOCK and ENABLE both low (0V) to reset the system. The 8020-59 will go back to sleep until it is time for the next reading. Using this feature, up to 16 Vibrating Wire transducers with thermistors may be multiplexed into a single DAS.

  • Page 19: 32-Channel Multiplexed Mode

    When the final transducer has been read, the host DAS brings CLOCK and ENABLE both low (0V) to reset the system. The 8020-59 will go back to sleep until it is time for the next reading. Using this feature, up to 32 Vibrating Wire transducers may be multiplexed into a single DAS.

  • Page 20: Conversion To "Digits

    Digits = [Frequency (Hz)]² x 0.001 Equation 1 - Vibrating Wire Frequency to Digits Conversion The 8020-59 provides analog outputs that are directly proportional to digits. Referring to the sample calibration in Figure 36 of Appendix E, a value in digits can be derived from the voltage and current outputs as described below.

  • Page 21: Connection To A Voltage Input Das

    4.4 Connection to a Voltage Input DAS The 8020-59 outputs a voltage (V OUT, 0-5V) that is proportional to the digits of the transducer being read (ENABLE = 0V (or disconnected) in Single Channel Mode, after the first of two CLOCKS in 16-Channel Mode, or after each CLOCK in 32-Channel Mode).

  • Page 22: Temperature Measurement

    4.6 Temperature Measurement The 8020-59 is capable of reading the thermistor that is part of a VW sensor. The 8020-59 outputs this reading as a voltage (0-5V) and current (4-20mA) that are proportional to temperature whenever ENABLE is high (5V), in Single Channel Mode, or while the second clock pulse is high, in 16-Channel mode.

  • Page 23: Communications

    5. COMMUNICATIONS The 8020-59 offers a standard 9-pin RS-232 Serial Port for connection to most desktop and laptop computers (an optional USB to Serial interface adapter is available). If using a terminal emulator program such HyperTerminal, Putty, etc., for command line set up (see Section 5.1) of the 8020-59, configure the program’s communication parameters as follows:...
  • Page 24 <Esc> Exit and Start Taking Readings (C1 only) Commands C1, C2 and C3 configure the 8020-59 for single channel, 16-Channel multiplexing or 32-Channel multiplexing, respectively. Note: The default value for the lower limit is zero, so for cases where this is acceptable, there is no need to explicitly set the lower limit.
  • Page 25 16,25000,160,+,Disabled Typing “R” <Enter> will return the firmware revision. Typing “Z” <Enter> will put the 8020-59 into low power sleep mode (off), drawing less than 10μA from the 12V power source (less than 16.5mA from the 24V power source). Finally, pressing the <Esc> key (in C1 single channel mode only) will start the readings screen with the 8020-59 outputting 0-5V and 4-20mA: 1,11665.75,22.8,-,1,#...

  • Page 26: Windows Application

    Startup dialog (see Figure 9). From the Startup dialog, the major functions (Mode, Communications, and Calibration) of the 8020-59 can be accessed. Click Com Setup to select the Com Port that the 8020-59 is connected to (see Section 2.1 and Figure 10).

  • Page 27: Single Channel Configuration

    6.4 Single Channel Configuration If the 8020-59 is to be used with only one transducer, the 8020-59 Mode should be set to Single Channel. Click “Single Channel” (or press the “Alt” and “s” keys) to display the Single Channel Configuration window (see Figure 11).

  • Page 28: 16-Channel Configuration

    6.5 16-Channel Configuration The 8020-59 can be used in conjunction with the Geokon model 8032 Multiplexer to configure and monitor up to 16 vibrating wire transducers with thermistors. For wiring details of this configuration, see Appendix C. The 8020-59 Mode should be set to 16-Channel. Clicking “16- Channel”...
  • Page 29 In the Transducer Limits section, the current minimum and maximum settings for the channels stored in the 8020-59’s on-board EEPROM are in the gray fields on the right. New values in the configuration are in the white fields on the left. Enter the transducer’s limits (in digits) from the transducer’s calibration report at “Maximum (digits)”...

  • Page 30: Figure 19 - Channel One Monitor

    The screen updates based on ENABLE and CLOCK timing from the Data Acquisition System. If monitoring the 8020-59 outputs is not of interest, then click Activate/Exit from the Configuration Window to put the 8020-59 into low power Standby (Sleep) mode, waiting...

  • Page 31: 32-Channel Configuration

    6.6 32-Channel Configuration 32-Channel Configuration and Monitor modes work identically to their 16-Channel counterparts with the only difference being that there are no temperature measurements (see Figure 20). Figure 20 - 32-Channel Monitor Screen Figure 21 - Channel Three Monitor...

  • Page 32: Appendix A. Specifications

    APPENDIX A. SPECIFICATIONS A.1 8020-59 Specifications Physical: Dimensions (L x W x H): 111.13 mm, 108.36 mm x 36.53 mm 4.375" x 4.266" x 1.438" Weight: 0.456 lbs. Operating Temperature: -20 to +80 degrees Celsius Power Requirements: +12V Input Voltage Range:...

  • Page 33: Multiplexer Timing Specifications

    Digital Control Input – ENABLE: (Single Channel) 5V CMOS levels: 0V = VW OUT 5V = °C OUT (Multiplexed) 5V CMOS levels: 0V = SLEEP 5V = READ Digital Control Input – CLOCK: (Single Channel) 5V CMOS levels: 0V = ON 5V = OFF (Multiplexed) 0-5V transition: Channel increment...

  • Page 34: Appendix B. Thermistor Temperature Derivation

    APPENDIX B. THERMISTOR TEMPERATURE DERIVATION Thermistor Type: YSI 44005, Dale #1C3001-B3, Alpha #13A3001-B3 Resistance to Temperature Equation: A+B ( LnR ) +C(LnR) -273.2 Equation 8 - Resistance to Temperature Where; T = Temperature in °C. LnR = Natural Log of Thermistor Resistance A = 1.4051 ×...

  • Page 35: Appendix C. Wiring Configurations

    APPENDIX C. WIRING CONFIGURATIONS C.1 Voltage Output – Single Channel Mode (Digital I/O DAS) Figure 24 - Connection Example for One Channel 8020-59 with Voltage Output to Digital I/O DAS...

  • Page 36: Voltage Output - 16-Channel Mode (Digital I/O Das)

    C.2 Voltage Output – 16-Channel Mode (Digital I/O DAS) Figure 25 - Connection Example for 16-Channel Multiplexer, 8020-59 with Voltage Output and Digital I/O DAS...

  • Page 37: Voltage Output - 32-Channel Mode (Digital I/O Das)

    C.3 Voltage Output – 32-Channel Mode (Digital I/O DAS) Figure 26 - Connection Example for 32-Channel Multiplexer, 8020-59 with Voltage Output and Digital I/O DAS...

  • Page 38: Current Output - Single Channel Mode (Digital I/O Das)

    C.4 Current Output – Single Channel Mode (Digital I/O DAS) Figure 27 - Connection Example for One Channel 8020-59 with Current Output to Digital I/O DAS...

  • Page 39: Current Output - 16-Channel Mode (Digital I/O Das)

    C.5 Current Output – 16-Channel Mode (Digital I/O DAS): Figure 28 - Connection Example for 16-Channel Multiplexer, 8020-59 with Current Output and Digital I/O DAS...

  • Page 40: Current Output - 32-Channel Mode (Digital Das)

    C.6 Current Output – 32-Channel Mode (Digital DAS) Figure 29 - Connection Example for 32-Channel Multiplexer, 8020-59 with Current Output and Digital I/O DAS...

  • Page 41: Voltage Output - Single Channel Mode (Plc Das)

    C.7 Voltage Output – Single Channel Mode (PLC DAS) Figure 30 - Connection Example for One Channel. 8020-59 with Voltage Output, 8020-59 PLC and PLC DAS...

  • Page 42: Voltage Output - 16-Channel Mode (Plc Das)

    C.8 Voltage Output – 16-Channel Mode (PLC DAS) Figure 31 - Connection Example for 16-Channel Multiplexer, 8020-59 w/ Voltage Output, 8020-59 PLC and PLC DAS...

  • Page 43: Voltage Output - 32-Channel Mode (Plc Das)

    C.9 Voltage Output – 32-Channel Mode (PLC DAS) Figure 32 - Connection Example for 32-Channel Multiplexer, 8020-59 w/ Voltage Output, 8020-59 PLC and PLC DAS...

  • Page 44: Current Output - Single Channel Mode (Plc Das)

    C.10 Current Output – Single Channel Mode (PLC DAS) Figure 33 - Connection Example for One Channel 8020-59 with Current Output, 8020-59 PLC and PLC DAS...

  • Page 45: Current Output - 16-Channel Mode (Plc Das)

    C.11 Current Output – 16-Channel Mode (PLC DAS) Figure 34 - Connection Example for 16-Channel Multiplexer, 8020-59 w/Current Output, 8020-59 PLC and PLC DAS...

  • Page 46: Current Output - 32-Channel Mode (Plc Das)

    C.12 Current Output – 32-Channel Mode (PLC DAS) Figure 35 - Connection Example for 32-Channel Multiplexer, 8020-59 w/Current Output, 8020-59 PLC and PLC DAS...

  • Page 47: Appendix D. Data Reduction

    APPENDIX D. DATA REDUCTION D.1 Pressure Calculation The digits that are calculated from the voltage and current outputs are based on the equation: Digits = � � x 10 Period Digits= 1000 Equation 9 - Digits Calculation For example, a piezometer reading 8000 digits corresponds to a period of 354 µs and a frequency of 2828 Hz.

  • Page 48: Temperature Correction

    From → ↓ "H 2 O 'H 2 O mm H 2 0 m H 2 0 "HG mm HG mbar .036127 .43275 .0014223 1.4223 .49116 .019337 14.696 .014503 14.5039 .14503 145.03 "H 2 O 27.730 .039372 39.372 13.596 .53525 406.78 .40147 401.47 4.0147 4016.1...

  • Page 49: Barometric Correction (Required Only On Non-Vented Transducers)

    D.3 Barometric Correction (required only on non-vented transducers) Since the standard piezometer is hermetically sealed and unvented, it responds to changes in atmospheric pressure. That being the case, corrections may be necessary, particularly for the sensitive, low-pressure models. For example, a barometric pressure change from 29 to 31 inches of mercury would result in ≈1 PSI of error (or ≈2.3 feet if monitoring water level in a well!).

  • Page 50: Appendix E. Sample Calibration Report

    APPENDIX E. SAMPLE CALIBRATION REPORT Figure 36 - Vibrating Wire Pressure Transducer Calibration Report...

  • Page 51: Appendix F. Improving The Accuracy Of Calculated Pressures

    The field value of C is calculated by inserting the initial zero reading into the polynomial equation with the pressure, P, set to zero. As of 8/2011, Geokon no longer includes the C coefficient on its calibration reports, ensuring that, to properly use the polynomial equation, users must calculate a C coefficient.

  • Page 52: Appendix G. Barometric Correction (Non-Vented Transducers Only)

    Referring to the example calibration report (Appendix E, Figure 36), note that the average zero reading (0 psi) is 9139 digits (8020-59 maximum digits) and the average maximum reading (100 psi) is 5691 digits (8020-59 minimum digits). These readings were recorded at an atmospheric pressure of 1001.4 mbar, corresponding to the conditions and altitude at the Geokon factory.

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