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Geokon LC-2x16 Instruction Manual

16 channel vw datalogger
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Instruction Manual
Model LC-2x16
16 Channel VW Datalogger
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 © 2007 - 2016 by Geokon, Inc.
(Doc Rev V, 4/24/2017)

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Summary of Contents for Geokon LC-2x16

  • Page 1 16 Channel VW Datalogger 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 4: Table Of Contents

    2.3.5 Adding Dataloggers to LogView Projects: ....................9   2.3.6 LC-2x16 Connection (8002-16-1, RS-232): ..................... 11   2.3.7 LC-2x16 Connection (8002-16-2, USB) : ....................11   2.3.8 LC-2x16 Connection 8002-16-3 (RS_485): ....................11   2.3.9 Connecting to a Datalogger with LogView: ..................... 12  ...
  • Page 5 3.38 ................................ 39     3.39 TR ................................39     3.40 TR0 ................................39     3.41 VL ................................39     3.42 V3 ................................39     3.43 V12 ................................40     3.44 WF ................................40    ...
  • Page 6 FIGURES, TABLES and EQUATIONS 1 - LC-2 16 16-C VW D ....................2   IGURE HANNEL ATALOGGER 2 - S ......................... 7   IGURE ELECT ORKSPACE 3 - S ........................8   IGURE ELECT ORKSPACE OLDER 4 - L ........................... 8  ...

  • Page 7: Introduction

    1. INTRODUCTION The Model LC-2x16 16 Channel Datalogger is a low cost, battery powered and easy to use measurement instrument designed to read up to 16 vibrating wire sensors equipped with thermistors. The 320K standard memory provides storage for 3555 data arrays. Each array consists of an...
  • Page 8 ± 2 minutes/year. The comma delineated ASCII output format allows for easy importing into popular spreadsheet   programs such as Lotus 1-2-3 or Microsoft Excel . See Appendix D for sample data files. Figure 1 - LC-2x16 16-Channel VW Datalogger...

  • Page 9: Getting Started

    Geokon model 4500S Vibrating Wire Pressure Transducer. 2.1 Transducer Installation Open up the LC-2x16 by releasing the two latches on the top of the LC-2x16 enclosure. Install each transducer to the LC-2x16 by threading the transducer’s cable through a bulkhead fitting on the side of the LC-2x16 enclosure and wire the cable’s five conductors into the terminal strip per...
  • Page 10 Channel Number Terminal Strip Terminal Strip Description Cable Wire Color Designator Position Vibrating Wire + Vibrating Wire - BLACK Thermistor + GREEN Thermistor - WHITE Analog Ground (shield) BARE WIRE Vibrating Wire + Vibrating Wire - BLACK Thermistor + GREEN Thermistor - WHITE Analog Ground (shield)

  • Page 11: Earth Ground Installation

    LC-2x16 enclosure is suggested. The stake should be driven as close to the datalogger as possible, and to a depth of at least three feet (one meter). A copper grounding lug is supplied on the exterior of the LC-2x16 enclosure to provide connection to this wire from the grounding rod.

  • Page 12: Software Installation And Setup

    NOTE: The USB drivers are only required for LC-2x16 models 8002-16-2 and the 8002-5 RS- 485 Interface Make sure that the (4) 1.5V D-cell alkaline batteries are installed in the datalogger (See Section 4.2 for instructions) and that the LC-2x16 datalogger is not connected to the computer at this time. 2.3.1 LogView Installation: 1.

  • Page 13: Launching Logview

    Or via the Windows Start button: → → “Programs Geokon LogView” 2.3.3 LogView Workspaces: When opening LogView for the first time, the user will be prompted to create a workspace name (see Figure 2). The workspace name can be any combination of letters and numbers and, ideally, will be descriptive in nature.
  • Page 14 Figure 3 - Select Workspace Folder If no other is specified, a default folder path is displayed based on the system default workspace path combined with the new workspace name. After the folder path has been specified, either the default or user selected (see Figure 3), clicking on “Ok” will display the main window of LogView (see Figure 4).

  • Page 15: Adding Projects To Logview Workspaces

    2.3.4 Adding Projects to LogView Workspaces: Right-clicking on the “PRODUCTION” workspace brings up a context sensitive menu that allows the user to add projects to this workspace (using the “New→Project” menu selection). Select a name that makes sense for the real world project this program will be used for.
  • Page 16 After physically connecting to a PC, all LC-2x16 dataloggers require a COM port to be identified in the “Connection Options”. Starting with firmware revision 3.1.X, LC-2x16 dataloggers can communicate at baud rates of 9600 and 115,200. Before this revision the datalogger baud rate was 9600 only so, for these dataloggers, the default setting should not be changed (see Figure 7).

  • Page 17: Lc-2X16 Connection (8002-16-1, Rs-232)

    2.3.6 LC-2x16 Connection (8002-16-1, RS-232): Connect the supplied LC-2x16 RS-232 Communications cable (S-8001-6) to the COM port of the LC-2x16 datalogger. The protective cap on the datalogger COM connector is removed by pushing in and turning. Plug the DB-9 end of the RS-232 Communications cable into the host computer’s RS-232 port (either internal or external via a USB to Serial...

  • Page 18: Connecting To A Datalogger With Logview

    3. Click on the “Upload Settings” button on the LogView Toolbar to synchronize the datalogger with the LogView configuration (see Figure 10). 4. LogView is now connected and configured correctly for the LC-2x16 datalogger. Sensors can now be added to the datalogger in a similar fashion as adding Dataloggers to Projects.

  • Page 19: Determining Com Port Numbers

    2.3.10 Determining COM Port Numbers: When connecting an 8002-16-1 datalogger to a PC with an internal serial port(s) the COM Port number that LogView requires is usually COM1 or COM2 but, occasionally may be COM3 if the PC has more than one internal serial port. Figure 11 below illustrates that the PC has two serial ports, one internal (COM1) and the other via a USB to serial converter (COM13).

  • Page 20: Communication Setup Example Using Hyperterminal

    2.4 Communication Setup Example Using HyperTerminal NOTE: If using a 8002-16-2 USB LC-2x16, it is important that the LC-2x16 first be connected to the computer’s USB port before attempting to communicate so that the LC-2x16 can be recognized by the computer as a virtual COM port.
  • Page 21 8 Data bits, no Parity, 1 Stop bit, no Flow control. 8002-16-2 (USB): Configure the new COM port that is added when the LC-2x16 is connected as 9600 Bits per second, 8 Data bits, no Parity, 1 Stop bit, no Flow control.

  • Page 22: L Nlllll Iii Ld

    Type ? <ENTER> to display the Help list. See Section 3 for detailed information on all the commands listed. All commands must be entered in capital letters! Command Description ------------------------------------------------ view current Clock CSmm/dd/yy/hh:mm:ss Clock Set DEFAULT Load factory DEFAULT gage settings Date Format(0=Julian,1=month,day) Display DataLogger type Dnnnnn...
  • Page 23 S,SS datalogger Status, System Status SCnnnnn view SCan interval/enter nnnnn interval SPhh:mm StoP logging, hh:mm = stop time Synchronize Readings(0=not synch'd,1=synch'd) SThh:mm STart logging, hh:mm = start time Software Version TEST System Test Time Format (0 = hhmm, 1 = hh,mm) Tnn/t Thermistor information, where: nn = Channel #...

  • Page 24: Command List

    3. COMMAND LIST BRnnn This command is not displayed in the help text (?<ENTER>). Displays or sets the current baud rate. Valid numbers for “nnn” are 9 (9600 baud) or 115 (115,200 baud). The example below changes the baud rate to 9600 with no confirmation. *BR9 Display the current datalogger real-time clock settings.
  • Page 25 Date format is month,day. *DF0 Date format is julian. Display the current datalogger mode setting. LC-2x16 Dnnnnn Use the D command to display arrays forward from the User Position for verification or collection. The updated memory pointers are displayed by this command.
  • Page 26 2007,11,27,10,01,30,3.10,25.51,9039.939,8054.505,7189.996,9020.112,---,---,---,---, 684.263,711.894, 610.023,680.320,---,---,---,---,15.6,15.6,15.4,15.5,---,---,---,---,23.2, 23.3,23.2,23.2,---,---,---,---,4 2007,11,27,10,02,00,3.10,25.51,9039.944,8054.276,7189.993,9020.108,---,---,---,---, 684.256,711.897, 610.022,680.323,---,---,---,---,15.6,15.6,15.4,15.5,---,---,---,---,23.2, 23.3,23.2,23.2,---,---,---,---,5 MS:3146 OP:3147 UP:6 MS represents the Memory Status of the datalogger. This number indicates how many arrays have been written to memory. In this example, MS:3146 indicates that 3146 out of 3555 arrays have been written to memory.

  • Page 27: Dnnnnne

    The syntax for this command is: Linear Conversion: Gnn/c/t/szzzzzz/sffffff/soooooo Where: nn = Channel # (Valid entries are 1,2,3…16 for the LC-2x16) c = Conversion Type(L/P) where L=Linear and P=Polynomial t = Gage Type: 0: Channel Disabled (will display “---“) 1: VW Gage Type 1...
  • Page 28 CH 1: ENABLED GT: 3 ZR: 490.0000 GF: -0.00150 GO: 0.00000 *Note: If selecting Gage Type 0 to disable the channel, the LC-2x16 will only return ‘*’. Use the MXS command (Section 3.18) to view the disabled channels. When using linear conversion (L) of the instrument reading, the G command is used to select the gage type and enter the gage zero reading, gage factor, and gage offset.
  • Page 29 Polynomial Conversion: Gnn/c/tt/saaaaaa/sbbbbbb/scccccc Where: nn = Channel # (Valid entries are 1,2,3…16 for the LC-2x16) c = Conversion Type(L/P) where L=Linear and P=Polynomial t = Gage Type: 0: Channel Disabled (will display “---“) 1: VW Gage Type 1 2: VW Gage Type 2...
  • Page 30 Geokon Model Gage Type Description 4000 Strain Gage 4100 Strain Gage 4200 Strain Gage 4204 Strain Gage 4202/421X Strain Gage 4300BX BX Borehole Stressmeter 4300EX EX Borehole Stressmeter 4300NX NX Borehole Stressmeter 4400 Embedment Jointmeter 4420 Crackmeter 4450 Displacement Transducer...
  • Page 31 The "Digits" calculation for the Vibrating Wire transducer output when using linear conversion is based on this equation:  10 Digits = frequency Equation 3 - Digits Calculation using Linear Conversion The "Digits" calculation for the Vibrating Wire transducer output when using polynomial conversion is based on this equation: ...

  • Page 32: Iddddddddddddddddd

    3.10 IDdddddddddddddddd Displays or sets the datalogger ID. The ID is a 16 character string that can be used to identify a datalogger and the data that is transmitted by it. If an ID is entered it will be transmitted as the first element in each array of data.
  • Page 33 3.11 Display all 6 log intervals. Log Intervals List ------------------------------------------------ Interval #1 Length: 30 Iterations: 100 Interval #2 Length: 40 Iterations: 90 Interval #3 Length: 50 Iterations: 80 Interval #4 Length: 60 Iterations: 70 Interval #5 Length: 90 Iterations: 60 Interval #6 Length: 120 Iterations: 0 This command has no effect on the current interval (scan or log).

  • Page 34: Ln/Lllll/Iii

    3.12 Ln/lllll/iii Define the length and iteration of any interval in the list; n refers to the number of the interval (1- 6), lllll is the length (3-86400), and iii is the iterations (0-255), or the number of readings that will be taken at that interval.
  • Page 35 3.15 Display the current Monitor mode setting. The monitor mode will display arrays as they are stored in memory in the course of logging. This is useful where a test is being conducted and immediate display of logged values would be helpful. Use the MD and ME commands (next two sections) to disable or enable the use of the Monitor mode.

  • Page 36: Mxs

    3.18 Display the Multiplexer Status. *MXS LC-2MUX 16-Channel Multiplexer Setup: CH 1: ENABLED GT: 1 ZR: 0.00000 GF: 1.00000 GO: 0.00000 TH: 0 CH 2: ENABLED GT: 1 ZR: 0.00000 GF: 1.00000 GO: 0.00000 TH: 0 CH 3: ENABLED GT: 1 ZR: 0.00000 GF: 1.00000 GO: 0.00000 TH: 0 CH 4: ENABLED GT: 1 ZR: 0.00000 GF: 1.00000 GO: 0.00000 TH: 0 CH 5: ENABLED...

  • Page 37: Mx N

    3.19 Select the maximum number of channels (4 or 16) of the multiplexer. For a LC-2x16, this is 16 by default: *MX16 16 Channel Multiplexer Selected. 3.20 Display the next time the datalogger will initiate a measurement cycle. If the start time (command ST) has been set, it will display when logging will begin.

  • Page 38: Naddd

    Network Enable the datalogger. Enables networking of two or more LC-2x16 dataloggers. Network recognition enabled. Note: If the LC-2x16 is connected via the USB port, connection to a network enabled datalogger can be made directly without the need to enter the correct datalogger address. This can be helpful...

  • Page 39: Pnnnn

    3.25 Display the current network status. Network recognition disabled. Network recognition enabled. 3.26 Pnnnn Position the User Position memory pointer. Type P and a number between 1 and 3555 to position the pointer. Arrays can then be displayed (D command) from the new position. The updated pointers will display after entering a valid position.

  • Page 40: Scnnnnn

    3.29 Display the datalogger Status. MS:1004 OP:1005 UP:1004 16 Channel Multiplexer Selected. Scan interval: 60 second(s). Logging stopped. Log intervals disabled. Monitor mode enabled. Line Description Manual Sections Status of memory pointers 3.7, 3.26 Multiplexer Type 3.18 Scan interval setting 3.30 Start/Stop status 3.32, 3.34...

  • Page 41: Sphh:mm

    Line Description Trap Count (Communications Error counter) Current network address Current network status Current time format configuration. Current date format configuration. Table 7 - SS Command Information 3.32 SPhh:mm StoP the datalogger logging values; hh is the hour (24 hour format) of the day to stop and mm the minutes.
  • Page 42 3.33 Synchronize Readings to the top of the hour. If enabled (default) via the SR1 command, then all readings after the first reading will synchronize to the top of the hour: *SR1 Readings are synchronized to the top of the hour. Logging started.

  • Page 43: Sthh:mm

    3.34 SThh:mm STart the datalogger logging values; hh is the hour of the day (24 hour format) to start and mm the minutes. The time entry is optional. Entry is ignored if logging is already started (unless a time is entered). Logging already started! *ST11:00 Logging will start at: 11:00:00...
  • Page 44 ENTER SELECTION: Selection Description Test the Configuration memory bank Test Readings 1-592 memory bank Test Readings 593-1184 memory bank Test Readings 1185-1776 memory bank Test Readings 1777-2368 memory bank Test Readings 2369-2960 memory bank Test Readings 2961-3555 memory bank Test all memory banks Turn on System power supplies Test the 32.768 RTC time base External Input with Gage Type 1 filter configuration...

  • Page 45: Tnn/T

    3.38 Tnn/t Enter the channel’s (nn) thermistor type (t). This command allows a specific thermistor to be assigned to each individual channel (generally the external thermistor that is incorporated into the VW gage). Entering T1/0 sets the external thermistor type of Channel 1 to the standard 3KΩ@25ºC NTC (default).
  • Page 46 3.43 Display the external 12V battery voltage. Replace or recharge the battery when this voltage is less than 6V *V12 12V Battery Voltage = 12.33V 3.44 Display the current Wrap Format. Memory “wrapping” means that once the memory has filled, the datalogger will continue taking readings and overwrite the stored values in a circular fashion (see Section 3.7, Dnnnnn).

  • Page 47: Maintenance

    4. MAINTENANCE While the Model LC-2x16 Datalogger is designed to operate in field environments, nevertheless there are some basic maintenance procedures that should be followed to insure maximum reliability and functionality. 4.1 Cleaning: The outside of the box can be cleaned using a cloth dampened with soap and water. DO NOT...

  • Page 48: Battery Replacement Instructions

    4.2.1 Battery replacement instructions: Release the 2 clasps on the top of the case and open the cover. Underneath the cover are the 'D' cell battery holders. Remove the four batteries from the holders, being careful not to bend the sides outward.

  • Page 49: Troubleshooting

    5. TROUBLESHOOTING Listed below are a few commonly experienced problems and remedial action. Contact the factory should a problem arise not explained herein or additional information be needed. 5.1 Unit will not respond to communications.  Wrong COM port selected. ...

  • Page 50: Appendix A. Specifications

    APPENDIX A. SPECIFICATIONS A.1 Measurement Capability Vibrating Wire (all types).  External temperature (thermistor).  Internal temperature (thermistor).  Main battery voltage (3V and 12V).  RTC lithium battery voltage.  A.2 Power Power supply: Internal 3 VDC (7.5Vmax) or External 12 VDC (15Vmax) Processing/communication current: <100 mA VW measurement current:...

  • Page 51: Clock

    Features: full calendar Time format: 12 or 24 hour (selectable) Date Format: mm,dd or Julian (selectable) 2 minutes per year Accuracy: A.5 Serial Interface (all LC-2x16 models): Speed: 9600 bps Parameters: 8 Data bits 1 Stop bit no Parity no Flow control Data output format: ASCII text A.6 RS-485 Network...

  • Page 52: Vibrating Wire Measurement

    A.7 Vibrating Wire Measurement Excitation sweep range: 400 Hz to 4500 Hz Frequency Measurement Technique: Adaptive Multiple Period Averaging Accuracy: 0.05% F.S.R. (450-4000 Hz) Resolution: 0.001 digits A.8 Internal/External Temperature Measurement Thermistor: Dale #1C3001-B3 (YSI 44005) (Standard Thermometrics BR55KAKA822J (High Temp U.S.

  • Page 53: Appendix B. Connector Pinouts

    APPENDIX B. CONNECTOR PINOUTS B.1 Transducer Cable Connections: Channel Terminal Strip Terminal Strip Description Cable Wire Number Designator Position Color Vibrating Wire + Vibrating Wire - BLACK Thermistor + GREEN Thermistor - WHITE Analog Ground (shield) BARE WIRE Vibrating Wire + Vibrating Wire - BLACK Thermistor +...
  • Page 54 Channel Terminal Strip Terminal Strip Description Cable Wire Number Designator Position Color Vibrating Wire + Vibrating Wire - BLACK Thermistor + GREEN Thermistor - WHITE Analog Ground (shield) BARE WIRE Vibrating Wire + Vibrating Wire - BLACK Thermistor + GREEN Thermistor - WHITE Analog Ground (shield)

  • Page 55: Rs-232 Connector Pinout (8002-16-1)

    B.2 RS-232 Connector Pinout (8002-16-1): The mating 10 pin Bendix plug is part number PT06F-12-10P. 10 Pin Internal Wire PCB connector J5 Description Bendix Color Brown Ground Orange Yellow Green Blue Violet Grey White Black Ground Table 11 - RS-232 Connector Pinout B.3 USB Connector Pinout (8002-16-2): The mating 10 pin Bendix plug is part number PT06F-12-10P.

  • Page 56: Appendix C. Data File Transfer To A Windows Pc

    APPENDIX C. DATA FILE TRANSFER TO A WINDOWS PC Data can be downloaded to the PC either via LogView software (refer to the LogView Online Help) or via Windows HyperTerminal, which, prior to Windows Vista, was supplied with most personal computers. The steps to download the data using LogView are as follows: C.1 Downloading Data using LogView The steps below assume that a successful connection has been previously established between LogView and the datalogger.
  • Page 57 If the datalogger configuration is set for “Collect new data since last download” in “Datalogger Settings→Data Collection Options” then LogView will issue commands to the datalogger to initiate a download of all arrays since the last time data was downloaded. Once the data collection has been initiated, the following progress bar (see Figure 19) will be displayed until the collection has completed: Figure 19 - Data Collection Progress Bar...

  • Page 58: Downloading Data Using Hyperterminal (Or Equivalent)

    C.2 Downloading Data using HyperTerminal (or equivalent) The steps to download the data using HyperTerminal are as follows: Launch HyperTerminal: Start → Programs → Accessories → Communications → HyperTerminal Enter a name for the New Connection – Select OK (see Section 2.4, Figure 13, HyperTerminal Connection Description).
  • Page 59 Figure 22 - Specify Data Capture File With the cursor in the display screen, push the Enter key a few times to wake up the datalogger. Type “S” to get the Status of the datalogger. Type “P1” to position the data array Pointer at location 1. Type “D3”...

  • Page 60: Appendix D. Sample Data File

    APPENDIX D. SAMPLE DATA FILE D.1 Sample Raw Data File Datalogger#1,2007,333,0930,0,2.98,20.27,-9092.555,-9438.785, -8711.083,-8981.410,-11592.234,-9767.552,-8294.582,-9045.733, -9499.814,-8729.308,-8818.881,-9740.115,-9023.331,-9299.900, -8962.831,-7812.252,18.9,19.2,19.4,19.7,19.0,19.3,19.2,19.4, 19.2,19.1,19.3,19.6,19.2,19.1,19.3,19.6,1 The comma delineated data above represents the following: Column 1 represents the datalogger id Column 2 represents the year when the array was stored. Column 3 represents the Julian day (or day, month format, see Section 3.5). Column 4 represents the time (or hh,mm format, see Section 3.37).

  • Page 61: Appendix E. Thermistor Temperature Derivation

    APPENDIX E. THERMISTOR TEMPERATURE DERIVATION Thermistor Type: YSI 44005, Dale #1C3001-B3, Alpha #13A3001-B3 Resistance to Temperature Equation: -273.2 A+B LnR +C(LnR) Equation 5 - Convert Thermistor Resistance to Temperature  Temperature in C. Where: T LnR  Natural Log of Thermistor Resistance ...
  • Page 62 Thermistor Type: Thermometrics BR55KA822J Resistance to Temperature Equation: -273.2 A+B LnR +C(LnR) Equation 6 - Convert Thermistor Type, BR55KA822J, Resistance to Temperature  Temperature in C. Where: T LnR  Natural Log of Thermistor Resistance  1.02569  10 -3 ...
  • Page 63 Thermistor Type: U.S. Sensor 103JL1A Resistance to Temperature Equation: -273.2 A+B LnR +C(LnR) +D(LnR) Equation 7 - Convert Thermistor Type, 103JL1A, Resistance to Temperature  Temperature in C. Where: LnR  Natural Log of Thermistor Resistance  1.12766979300187  10 -3 ...

  • Page 64: Appendix F. Networking

    APPENDIX F. NETWORKING F.1 Description The Model LC-2x16 Datalogger is capable of being networked by way of a single, optically isolated RS-485 communications cable. Utilizing one 8001-5 (RS-232) or 8002-5 (USB) RS-485 interface adapter at the computer (data collection) end, up to 255 Model LC-2x16 Dataloggers* may be networked.

  • Page 65: Example Of A 3 Datalogger Networking Session

    F.2 Example of a 3 Datalogger Networking Session This session assumes that there are three dataloggers running at 60 second scan intervals. Press <ENTER> <ENTER> to wake the dataloggers from sleep. At this point, each datalogger is “listening” for its network address to be transmitted down the RS-485 bus. To communicate with Datalogger number one and observe a reading type #1<ENTER>.

  • Page 66: Appendix G. Lithium Coin Cell

    Under normal operating conditions, the 1.5V ‘D’ cells provide all the power required to operate the LC-2x16 datalogger. In order to maintain the correct date and time settings for those periods when the ‘D’ cells are removed, the LC-2x16 datalogger incorporates a 3V lithium coin cell (Panasonic CR2032) to supply operating current to the internal Real Time Clock.

  • Page 67: Appendix H. Model 8032-27 And Load Cell Wiring

    Blue Table 16 -Common Conductor Chart White's black and Green wires are switched on Geokon three gage VW load cells prior to serial number 3313. The following wiring chart details the connections between the load cell and 8032-27 with the...

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