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Geokon 8032 Instruction Manual

Terminal board and 16/32-channel multiplexer
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Download this manual See also: Instruction Manual
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
®
.
The information contained herein is believed to be accurate and reliable. However, GEOKON
®
assumes no responsibility for
errors, omissions or misinterpretation. The information herein is subject to change without notification.
Copyright © 20015-2020 by GEOKON
®
(Doc Rev K, 1/22/20)

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Summary of Contents for Geokon 8032

  • Page 1 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 ® The information contained herein is believed to be accurate and reliable. However, GEOKON ®...
  • 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 5: Table Of Contents

    APPENDIX B. CONNECTOR AND CABLE WIRING ..................14 APPENDIX C. MANUAL SWITCH INSTRUCTIONS ..................16 APPENDIX D. “DAISY-CHAIN” OPERATION ....................17 APPENDIX E. MAXIMUM 8032-5 (TAN CABLE) CABLE LENGTHS ............18 APPENDIX F. MEMS SENSOR TO MULTIPLEXER WIRING ................ 19...
  • Page 6 HANNEL ULTIPLEXER ERMINAL OARD IRING 3 - C ........................9 ABLE OMMON ONDUCTOR HART 4 - S VW L 8032-27 ................ 9 ABLE TANDARD IRING SING 5 - S ............................13 ABLE PECIFICATIONS 6 - J4 (I/O) C ............................14 ABLE ONNECTOR 7 - P1 (I/O) C ...........................14...

  • Page 7: Theory Of Operation

    Two switching configurations are supported, 16-channels of four conductors or 32-channels of two conductors. For the 8032-C, these configurations are set by a DIP Switch on the top side of the circuit board. A second DIP Switch selects whether the 8032-C is being used with a datalogger or GK-403 Readout Box (obsolete model).
  • Page 8 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 2 - 16-Channel Switching Block Diagram The 32-channel two-wire switching configuration (Figure 3) is typically used to multiplex two- wire sensors such as a vibrating wire pressure transducers, thermistors or thermocouples.

  • Page 9: Modes Of Operation

    1.2 Modes of Operation The multiplexer is powered by a nominal 12 VDC supply. Two control lines (RESET and CLOCK) determine how channel selection is accomplished. Two schemes are supported - one when connected when connected to Model 8600 dataloggers, and the other for the GK-403 Vibrating Wire Readout Box (obsolete model).

  • Page 10: Gk-403 Mode Of Operation

    Reset Clock Pulse 1 Pulse 2 Pulse 32 No Channel Channel 1 Channel 2 Channel 32 No Channel Selected Selected Selected Selected Selected Timing: T1 = 50 mSec (min) T2 = 2 mSec (min) T3 = 4 mSec (min) Figure 6 - 32-Channel Datalogger Channel Selection Timing 1.2.2 GK-403 Mode of Operation (Please note: The GK-403 is an obsolete model.
  • 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 8 - 32-Channel GK-403 Channel Selection Timing...

  • Page 12: 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 13 Actual gauge 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 Gauge Bridge (with Remote Sense) VW Sensor #1 S+ from Bridge #1 Excitation Pot #1...
  • Page 14 Figure 10 depicts the terminal board to which gauge 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 gauge connections. T1/2 T9/10 T17/18...

  • Page 15: Model 8032-27 And Load Cell Wiring

    Blue Table 3 - Common Conductor Chart *White's black and Green wires are switched on GEOKON 3-gauge VW load cells prior to serial number 3313. The following wiring chart details the connections between the load cell and 8032-27 with the terminal board:...

  • 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...

  • Page 17: Maintenance And Troubleshooting

    3. MAINTENANCE AND TROUBLESHOOTING 3.1 Maintenance Maintenance for the Model 8032 Multiplexer/Terminal Board is minimal. The following checks should be performed periodically though;  Is there water or other contaminants intruding into the enclosure? At times water can wick through the sensor cables onto the terminal board. This will at some point cause problems with the system.

  • Page 18: Appendix A. Specifications

    APPENDIX A. SPECIFICATIONS GENERAL: Power Requirements 10-16 VDC (unregulated) Quiescent Current (Datalogger mode) 80 µA (16CH mode), 130µA (32CH mode) Quiescent Current (GK-403 mode) 12 mA Channel Activated Current 30 mA Control Line Input Impedance 100 kΩ (CLOCK), 100 kΩ (RESET) Control Line Input Levels TTL or RS-232 (±9 VDC) Transient Protection...
  • Page 19 INDUCTOR Rated Current Inductance 10µH (±20%) D.C.R. 25mΩ MAX (at 20°C) TRANSIENT VOLTAGE SUPPRESSOR (TRANSORB): Rated Power 1500W Peak forward Surge Current 200A Reverse Standoff Voltage 16.0V TRANSDUCER CONNECTION MAXIMUM OPERATING VOLTAGE LEVELS: Common mode Voltage/Earth Ground 16V(max) Differential mode Voltage 16V(max) (Channel # ‘H’...

  • Page 20: Appendix B. Connector And Cable Wiring

    APPENDIX B. CONNECTOR AND CABLE WIRING Inside 10 Pin 8032-5 (TAN) Cable Description Color Bendix Wire Color 1 Brown COM HI 1 White COM LO 1 White's Black 3 Orange COM HI 2 (16-channel) 4 Yellow COM LO 2 (16-channel)
  • Page 21 Terminal Terminal Label Label Blocks Blocks 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. "Daisy-Chain" Operation

    APPENDIX D. “DAISY-CHAIN” OPERATION Up to eight 8032’s can be “daisy-chained” together using a common RESET and CLOCK control line. This can be advantageous in situations where either there are not enough control ports available on the datalogger for the number of multiplexers desired, or to reduce the number of cables required to implement a large multi-channel system.

  • Page 24: Appendix E. Maximum 8032-5 (Tan Cable) Cable Lengths

    APPENDIX E. MAXIMUM 8032-5 (TAN CABLE) CABLE LENGTHS The 8032 Multiplexer is a low power device, that can be physically located at a considerable distance from the Datalogger. The limitations to the maximum distance between the 8032 multiplexer and the datalogger are mostly due to the voltage dropped by the 8032-5 MUX cable over its length.

  • Page 25: Appendix F. Mems Sensor To Multiplexer Wiring

    APPENDIX F. MEMS SENSOR TO MULTIPLEXER WIRING Up to sixteen Uniaxial MEMS sensors are connected to the Canary six-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. Each terminal block, or Multiplexer channel, consists of seven clamp connections.

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