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Geokon 8032 Instruction Manual

Terminal board and 16/32 channel multiplexer
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INSTRUCTION MANUAL
MODEL 8032
TERMINAL BOARD AND 16/32 CHANNEL MULTIPLEXER
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 © 2015 by Geokon, Inc.
(Doc Rev H, 6/1)

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  • Page 1 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.
  • 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 or...

  • Page 5: Table Of Contents

    APPENDIX B - CONNECTOR AND CABLE WIRING ................ 14 APPENDIX C - MANUAL SWITCH INSTRUCTIONS ................. 16 APPENDIX D – DAISYCHAIN OPERATION ..................17 APPENDIX E - MAXIMUM 8032-5 (TAN CABLE) CABLE LENGTHS ..........19 APPENDIX F – MEMS SENSOR TO MULTIPLEXER WIRING ............20...
  • Page 6 LIST of FIGURES, TABLES and EQUATIONS 1 - 16 C .................. 2 IGURE HANNEL WITCHING LOCK IAGRAM 2 - 32 C .................. 3 IGURE HANNEL WITCHING LOCK IAGRAM 3 - 16 32 C ..................... 3 IGURE HANNEL ELECTION 4 – GK-403/DATALOGGER S ..................

  • Page 7: Theory Of Operation

    Two switching configurations are supported, 16 channels of 4 conductors or 32 channels of 2 conductors. For the 8032-C, these configurations are set by a DipSwitch on the top side of the circuit board. A second DipSwitch selects whether the 8032-C is being used with a datalogger or GK-403 Readout Box.
  • Page 8 Supported switching arrangements: Multiplexer/Terminal Board GK-403 or Sensor #16 CR800/CR1000 Microcontroller Sensor Shield GROUND GROUND Relay Control RESET RESET CLOCK CLOCK COM HI 1 COM LO 1 COM HI 2 COM LO 2 Sensor #1 Sensor Shield Figure 1 - 16 Channel Switching Block Diagram The 16 channel 4 wire switching configuration is typically used to multiplex 4 wire sensors such as resistance strain gage load cells.
  • Page 9 Multiplexer/Terminal Board GK-403 or Sensor #32 CR800/CR1000 Microcontroller Sensor Shield GROUND GROUND Relay Control RESET RESET CLOCK CLOCK COM HI COM LO Sensor #1 Sensor Shield Figure 2 - 32 Channel Switching Block Diagram The 32 channel 2 wire switching configuration is typically used to multiplex 2 wire sensors such as a vibrating wire pressure transducers, thermistors or thermocouples.

  • Page 10: Gk-403 Mode Of Operation

    Figure 4 illustrates the DIP switch SW2 for switching between a GK-403 or Datalogger application. “DATALOGGER”” is the default SW2 position: GK-403 DATALOGGER Figure 4 – GK-403/DATALOGGER Selection 1.1 GK-403 Mode of Operation The GK-403 mode of operation uses a single control line to select channels. This scheme allows individual channels to be selected without having to sequentially advance through all channels.
  • Page 11 Timing: T1 = min 20 usec T2 = min 20 usec T3 = min 40 µsec (25kHz) T4 = 500 µsec Clock Channel 1 Channel Selected Channel 2 Figure 6 - 32 Channel GK-403 Channel Selection Timing The GK-403 channel selection scheme is not well suited to long cable lengths. The maximum recommended distance between the GK-403 and multiplexer is 50 feet (15 meters).

  • Page 12: Micro-800/Micro-1000 Mode Of Operation

    1.2 MICRO-800/MICRO-1000 Mode of Operation The MICRO-800 and MICRO-1000 (which respectively utilize a CR800 and CR1000 controller, manufactured by Campbell Scientific, Inc. of Logan, Utah) mode of operation uses two control lines to operate the multiplexer. The RESET line enables the multiplexer and activates the MICRO-800/MICRO-1000 mode of clocking.

  • Page 13: Installation And Wiring

    2. INSTALLATION AND WIRING 2.1 Installation The multiplexer (or terminal board alone) is housed in a Nema 4/4X weatherproof enclosure. However, it is recommended that additional measures be taken to ensure that water or other contaminants are prevented from entering and subsequently disrupting operation of the equipment.
  • Page 14 Actual gage connections to the terminal board will vary depending on the instrument type and cable used. Note the following tables to get the general idea. Terminal Vibrating Wire Resistance Strain Linear Potentiometer Board with Thermistor Gage Bridge (with Remote Sense) VW Sensor #1 S+ from Bridge #1 Excitation Pot #1...
  • Page 15 Figure 10 depicts the terminal board to which gage connections are made. If the terminal board is equipped with manual switches, connectors J1 and J2 will have ribbon cables that are connected to the switch boards. Terminal Blocks T1/2 to T31/32 are for the gage connections. T1/2 T9/10 T17/18...

  • Page 16: Datalogger Connection

    2.3 Datalogger Connection Following sensor and installation, connections between a Datalogger and Multiplexer(s) can be made using the model 8032-5 interconnect cable. Each Multiplexer employed is connected to the appropriate weather tight 10-pin Bendix connector mounted on the enclosure. Each connector on a standard Datalogger is pre-wired to control and read the external Multiplexers.

  • Page 17: Troubleshooting

    4. TROUBLESHOOTING Below are some commonly experienced problems along with possible remedial action. Contact the factory if any problem remains unresolved or additional help is required. A particular channel on the multiplexer appears to be malfunctioning.  Check sensor connections on the terminal board. Clean if corrosion exists. ...

  • Page 18: Appendix A - Specifications

    APPENDIX A - SPECIFICATIONS A.1 General Power Requirements: 10-16 VDC (unregulated) Quiescent Current (MICRO-800/MICRO-1000 mode): 80 A (16CH mode) 130A (32CH mode) Quiescent Current (GK-403 mode): 12 mA Channel Activated Current: 30 mA Control Line Input Impedance: 100 k (CLOCK), 100 k (RESET) Control Line Input Levels: TTL or RS-232 (9 VDC) Transient Protection: 16 VDC Transzorbs Operating Temperature: 40 to 60...
  • Page 19 A.5 Inductor Rated Current: 4A Inductance: 10µH (±20%) D.C.R.: 25m MAX (at 20°C) A.6 Transient Voltage Suppressor (Transorb) Rated Power: 1500W Peak forward Surge Current: 200A Reverse Standoff Voltage: 16.0V A.7 Transducer Connection Maximum Operating Voltage Levels: Common-mode Voltage/Earth Ground: 16V(max) Differential-mode Voltage (Channel # ‘H’...

  • Page 20: Appendix B - Connector And Cable Wiring

    APPENDIX B - CONNECTOR AND CABLE WIRING Inside 10 Pin Description 8032-5 (TAN) Cable Color Bendix Wire Color Brown COM HI 1 White COM LO 1 White's Black Orange COM HI 2 (16 channel) Yellow COM LO 2 (16 channel) Red's Black Shield Drain Wires –...
  • Page 21 Terminal Blocks Label Terminal Blocks Label T1/2 T17/18 T1/2 T17/18 T1/2 T17/18 T1/2 T17/18 T3/4 T19/20 T3/4 T19/20 T3/4 T19/20 T3/4 T19/20 T5/6 T21/22 T5/6 T21/22 T5/6 T21/22 T5/6 T21/22 T7/8 T23/24 T7/8 T23/24 T7/8 T23/24 T7/8 T23/24 T15/16 T31/32 T15/16 T31/32 T15/16...

  • Page 22: Appendix C - Manual Switch Instructions

    APPENDIX C - MANUAL SWITCH INSTRUCTIONS The Model 8032 16/32 Channel Multiplexer directly supports manual switching of the sensor leads. This feature allows the user to easily connect a manual readout and obtain measurements in tandem with the automatic system. The manual switching components are optional and must be specified at time of order.

  • Page 23: Appendix D - Daisychain Operation

    APPENDIX D – DAISYCHAIN OPERATION Up to (8) 8032’s may be ”daisychained” together using a common RESET and CLOCK control line. This may be advantageous in situations where either there are not enough control ports available on the Micro-800/MICRO-1000 datalogger for the number of multiplexers desired, or to reduce the number of cables required to implement a large multi-channel system.
  • Page 24 Micro-800/1000 Datalogger Reset Clock Reset Clock Multiplexer #1 MUX1 VW Gages 1-32 SW1 SETTING: OFF OFF OFF Reset Clock Multiplexer #2 VW Gages 33-64 MUX2 SW1 SETTING: OFF OFF ON Reset Clock Multiplexer #3 VW Gages 65-96 MUX3 SW1 SETTING: OFF ON OFF Figure D.1: Daisychain Configuration...

  • Page 25: Appendix E - Maximum 8032-5 (Tan Cable) Cable Lengths

    1000 Datalogger can be physically located at a considerable distance from that Datalogger. Still, there are limits to the maximum distance – mostly due to the voltage dropped by the 8032-5 MUX cable over its length. Factors such as ambient temperature, number of 8032 Multiplexers (Daisy-Chain configuration) and system battery voltage need to be considered in determining the maximum 8032-5 cable length.

  • Page 26: Appendix F - Mems Sensor To Multiplexer Wiring

    APPENDIX F – MEMS SENSOR TO MULTIPLEXER WIRING Up to sixteen (16) Uniaxial MEMS sensors are connected to the Canary 6 wire Multiplexer through the weather tight strain relief fittings mounted to the Datalogger enclosure; with the final connection made to the terminal blocks mounted on the Multiplexer.

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