Geokon 8032 Manuale utente

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.

(Doc Rev K, 1/22/20)

Warranty Statement

GEOKON warrants its products to be free of defects in materials and workmanship, under

normal use and service for a period of 13 months from date of purchase. If the unit should

malfunction, it must be returned to the factory for evaluation, freight prepaid. 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 shows evidence of being damaged as a result of excessive corrosion or current, heat, moisture

or vibration, improper specification, misapplication, misuse or other operating conditions outside

of GEOKON's control. Components which wear or which are damaged by misuse are not

warranted. This includes fuses and batteries.

GEOKON manufactures scientific instruments whose misuse is potentially dangerous. The

instruments are intended to be installed and used only by qualified personnel. There are no

warranties except as stated herein. There are no other warranties, expressed or implied, including

but not limited to the implied warranties of merchantability and of fitness for a particular

purpose. GEOKON is not responsible for any damages or losses caused to other equipment,

whether direct, indirect, incidental, special or consequential which the purchaser may experience

as a result of the installation or use of the product. The buyer's sole remedy for any breach of this

agreement by GEOKON or any breach of any warranty by GEOKON shall not exceed the

purchase price paid by the purchaser to GEOKON for the unit or units, or equipment directly

affected by such breach. Under no circumstances will GEOKON reimburse the claimant for loss

incurred in removing and/or reinstalling equipment.

Every precaution for accuracy has been taken in the preparation of manuals and/or software,

however, GEOKON neither assumes responsibility for any omissions or errors that may appear

nor assumes liability for any damages or losses that result from the use of the products in

accordance with the information contained in the manual or software.

TABLE of CONTENTS

1. THEORY OF OPERATION ..................................................................................................................................1

1.1 CHANNEL SWITCHING..........................................................................................................................................1

1.2 MODES OF OPERATION ........................................................................................................................................3

1.2.1 Datalogger Mode of Operation...................................................................................................................3

1.2.2 GK-403 Mode of Operation ........................................................................................................................4

2. INSTALLATION AND WIRING ..........................................................................................................................6

2.1 INSTALLATION .....................................................................................................................................................6

2.2 WIRING................................................................................................................................................................6

2.2.1 Model 8032-27 and Load Cell Wiring ........................................................................................................9

2.3 DATALOGGER CONNECTION ..............................................................................................................................10

3. MAINTENANCE AND TROUBLESHOOTING...............................................................................................11

3.1 MAINTENANCE ..................................................................................................................................................11

3.2 TROUBLESHOOTING ...........................................................................................................................................11

APPENDIX A. SPECIFICATIONS.........................................................................................................................12

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

FIGURES

FIGURE 1-CHANNEL SELECTION SWITCH (POSITION 1ON SW1).................................................................................. 1

FIGURE 2-16-CHANNEL SWITCHING BLOCK DIAGRAM ................................................................................................ 2

FIGURE 3-32-CHANNEL SWITCHING BLOCK DIAGRAM ................................................................................................ 2

FIGURE 4-GK-403/DATALOGGER SELECTION......................................................................................................... 3

FIGURE 5-16-CHANNEL DATALOGGER CHANNEL SELECTION TIMING......................................................................... 3

FIGURE 6-32-CHANNEL DATALOGGER CHANNEL SELECTION TIMING......................................................................... 4

FIGURE 7-16-CHANNEL GK-403 CHANNEL SELECTION TIMING .................................................................................. 4

FIGURE 8-32-CHANNEL GK-403 CHANNEL SELECTION TIMING .................................................................................. 5

FIGURE 9-MULTIPLEXER ENCLOSURE MOUNTING DIMENSIONS .................................................................................. 6

FIGURE 10 -TERMINAL BOARD LAYOUT ....................................................................................................................... 8

FIGURE 11 -MODEL 8032-27 JUMPER WIRE ASSEMBLY ............................................................................................... 9

FIGURE 12 -MANUAL SWITCH PANEL AND ENCLOSURE ..............................................................................................16

FIGURE 13 -“DAISY-CHAIN”CONFIGURATION .............................................................................................................17

FIGURE 14 -RECOMMENDED MAXIMUM CABLE LENGTH.............................................................................................18

TABLES

TABLE 1-16-CHANNEL MULTIPLEXER/TERMINAL BOARD WIRING ............................................................................. 7

TABLE 2-32-CHANNEL MULTIPLEXER/TERMINAL BOARD WIRING ............................................................................. 7

TABLE 3-COMMON CONDUCTOR CHART ..................................................................................................................... 9

TABLE 4-STANDARD VW LOAD CELL WIRING WHEN USING 8032-27........................................................................ 9

TABLE 5-SPECIFICATIONS ...........................................................................................................................................13

TABLE 6-J4 (I/O) CONNECTOR....................................................................................................................................14

TABLE 7-P1 (I/O) CONNECTOR ...................................................................................................................................14

TABLE 8-J1/J2 (TERMINAL BOARD)CONNECTORS .....................................................................................................15

TABLE 9-“DAISY-CHAIN”OPERATION/CHANNELS ACCESSED ...................................................................................17

TABLE 10 -UNIAXIAL MEMS WIRING .........................................................................................................................19

TABLE 11 -BIAXIAL MEMS WIRING ...........................................................................................................................19

1. THEORY OF OPERATION

The Model 8032 Terminal Board and Multiplexer expands the number of channels that can be

read by the 8600 Datalogger. Channel switching is accomplished by mechanical relays mounted

on the underside of the circuit board and the transducer connections are accomplished by friction

locking spring-loaded terminals mounted on the top side of the circuit board.

There are two varieties of 8032 board:

8032-E: Terminal Board only – typically used in conjunction with a 4999 Manual Switch Box

8032-C: Terminal Board with Multiplexer – typically used with the 8600 Datalogger.

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). For the 8032-E, these configurations are

determined by the 4999 Manual Switch Box.

To protect against lightning or EMI/RFI induced transients, each channel is protected by an

integrated lightning protection system, incorporating 230V tripolar plasma surge arrestors, 150V

bipolar plasma surge arrestors, 10uH inductors and 16V transient voltage protection diodes. See

Appendix A for complete specifications on these components.

1.1 Channel Switching

Figure 1 illustrates the DIP switch marked “SW1” on the top side of the multiplexer circuit

board. Switch position 1 is used for switching between 16 and 32-channel operation. If position 1

is set to OFF, the multiplexer is in 16-channel mode. If position 1 is set to ON, the multiplexer

is in 32-channel mode. In Figure 1, 32-channel mode is chosen:

Figure 1 - Channel Selection Switch (Position 1 on SW1)

The 16-channel four-wire switching configuration (Figure 2) is typically used to multiplex four-

wire sensors such as resistance strain gauge load cells. It is also used to switch connections for

instruments which have more than one sensor integral to them, such as vibrating wire pressure

transducers with an integral thermistor for measuring temperature.

OFF

SW1

Relay

Control

Microcontroller

12V

GROUND

RESET

CLOCK

COM HI 1

COM LO 1

GK-403 or

CR800/CR1000

Sensor #1

12V

GROUND

RESET

CLOCK

Multiplexer/Terminal Board

Sensor

Shield

COM HI 2

COM LO 2

Sensor #16

Sensor

Shield

31H

32H

31L

32L

S16

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.

Relay

Control

Microcontroller

12V

GROUND

RESET

CLOCK

COM HI

COM LO

GK-403 or

CR800/CR1000

Sensor #1

Sensor #32

12V

GROUND

RESET

CLOCK

Multiplexer/Terminal Board

Sensor

Shield

Sensor

Shield

32H

32L

S16

Figure 3 - 32-Channel Switching Block Diagram

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). See the following sections explaining how each

mode operates.

Figure 4 illustrates the DIP switch SW2 for switching between a GK-403 or Datalogger

application. “DATALOGGER” is the default SW2 position:

Figure 4 - GK-403/DATALOGGER Selection

1.2.1 Datalogger Mode of Operation

The Datalogger mode of operation uses two control lines to operate the multiplexer. The

RESET line enables the multiplexer and activates the Datalogger mode of clocking.

Pulses received on the CLOCK line sequentially increment the channels while the RESET

line is held high. See the timing diagrams below (Figure 5 and Figure 6)

The CLOCK line sequentially advances the channels beginning with Channel 1. Note the

timing diagrams for 16-channel (shown in Figure 5) and 32-channel (shown in Figure 6)

channel switching arrangements.

Reset

Clock

Channel 1

No Channel

Selected

No Channel

Selected

Channel 16

Pulse 1

Pulse 2

Pulse 31

Timing:

T2 = 2 mSsec(min)

T3 = 4 mSsec(min)

T1 = 50 mSec(min.)

Selected

Pulse 32

Figure 5 - 16-Channel Datalogger Channel Selection Timing

GK-403

DATALOGGER

SW2

Reset

Clock

Channel 1

Channel 2

No Channel

Selected

No Channel

Selected

Channel 32

Pulse 1

Pulse 2

Pulse 32

Selected

Timing:

T2 = 2 mSec (min)

T3 = 4 mSec (min)

T1 = 50 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. This mode of operation has been

retained for legacy purposes.)

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. Multiplexers can also be connected together in a “daisy-chain” fashion using

the GK-403 protocol. In 16-channel mode, the number of clock pulses equals two times

the desired channel number. In 32-channel mode, the number of clock pulses equals the

desired channel number plus one. Note the timing for 16-channel (shown in Figure 7) and

32-channel (shown in Figure 8) switching arrangements.

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).

Clock

Channel 2

Timing:

T2 = min 20 usec

T3 = min 40 µsec (25kHz)

T1 = min 20 usec

Channel Selected

Channel 1

T4 = 500 µsec

Figure 7 - 16-Channel GK-403 Channel Selection Timing

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