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Page 8

688 Manual 

fittings

 at each end.  

At the lowest point in the air line 

insert a T fitting with approximately two feet of Synflex 

hanging down to provide a drain for any water than may 

get into the system.  If a T fitting is not feasible, put a 

fitting into the bottom of the display enclosure and route 

the 2 feet of Synflex from there.

8. 

Feed the fiber optic cable through the hose, leaving about 

8 inches extra at each end.  Cut the fiber ends square with a 

sharp knife.  Insert the fiber into the connectors at each end 

and tighten the connector lock nuts.

9. 

Mount the rack socket(s) and wire the rack socket(s) to the 

controller wires.  The controller is wired as though it were a 

probe.  The wiring pattern for the rack socket(s) should be 

verified with the loading rack facility.  The wiring code for the 

controller is as follows:

COLOR  FUNCTION

PROBE EQUIVALENT

Red

Optic power

Optic probe red wire

Yellow

Optic pulse input

Optic probe yellow wire

Orange Optic pulse output

Optic probe orange wire

Black

Optic & thermistor ground

Optic probe black wire

Thermistor probe white wire

Green

Thermistor lead #1

Thermistor probe black wire

Green

Thermistor lead #2

Thermistor probe black wire

 

10.  For dual trailer applications, wire the optic portion of the 

two controllers in series as though they were probes (reds 

and blacks together in parallel, yellow and orange in series).  

Wire the thermistor portion with a black probe lead from the 

rack socket to a green lead on a controller.  The white probe 

ground leads from the socket connect to the controller black 

ground leads.  The green temperature compensation probe 

leads from the socket are not connected.

11.  Refer to the proper gauge manual and program alarm point 4 

as SHUT DOWN at the desired overfill point.

12.  Connect a sensor tester to each of the rack sockets and verify 

proper rack shutdown by lifting the floats, or simulating float 

movement with a programmer.

Summary of Contents for MULTIRACK 688-D

Page 1: ...60 Old Granbury Road Granbury TX 76049 CANADA Garnet Instruments 286 Kaska Road Sherwood Park AB T8A 4G7 garnetinstruments com 1 800 617 7384 Optic Thermistor Rack Control for Trucks MODEL 688 S 688 D MANUAL MUL TIRACK TM ...

Page 2: ... CHAPTER 2 OPERATIONS AND FEATURES 4 CHAPTER 3 INSTALLATION GUIDE 7 CHAPTER 4 TROUBLESHOOTING GUIDE 10 CHAPTER 5 SERVICE AND WARRANTY INFORMATION 12 GARNET MultiRACK TM Optic Thermistor Rack Control for Trucks MODEL 688 S 688 D MANUAL 688 Manual_v5 4 06 Dec 2019 ...

Page 3: ...nd thermistor style two wire loading racks The MULTIRACK TM will shut down the loading rack when the product level reaches the programmed shutdown point in the SEELEVEL gauge The MULTIRACK TM will withstand the vibration shock moisture and temperature extremes encountered in transport applications It is housed in a durable weatherproof housing and will operate over an ambient temperature range of ...

Page 4: ...THERM B OPTIC THERM A MODEL 688 OPTIC THERMISTOR LOADING RACK CONTROLLER MultiRackTM POWER OPTIC SIGNAL 810 X Bar MULTIRACK Rack Plugs Wired to MULTIRACK 808 P2 SEELEVEL SPECIAL or 810 PS2 SEELEVEL PROSERIES II SHUT UNPLUGGED OPEN CIRCUIT DOWN HORN ALARM EMPTY RE ARM MANUAL RE ARM BYPASS VALVE ERROR SHORT CIRCUIT PTO ON OFF ENGINE ON MODEL 815UHP ALARM CONTROLLER WARNING SEE OWNERS MANUAL FOR INFO...

Page 5: ...tion has two trailers then the optic portions of the two controllers are series wired just like optic probes The controller has two thermistor leads to simulate two thermistor probes and will operate with either one or both of the thermistor leads connected For two trailer applications each of the thermistor leads from the rack socket is connected to its own controller The controller simulates a t...

Page 6: ... TM or SEELEVEL SPECIAL TM at the start of loading each compartment If any skipping of calibration points is observed discontinue loading until the problem is corrected Please refer to the manuals for these instruments for further details Installation Installation of the system consists of connecting the appropriate module into the gauge and programming alarm point 4 The controller enclosure is mo...

Page 7: ...eak through the inside If you drill off a wire or fiber connector it will NOT be covered by warranty 5 Mount the controller enclosure using the mounting flange holes being certain to shim the enclosure away from the mounting surface with the spacers provided to allow water drainage Broken controller enclosures caused by water freezing behind the enclosure are NOT covered by warranty 6 Connect the ...

Page 8: ...IVALENT Red Optic power Optic probe red wire Yellow Optic pulse input Optic probe yellow wire Orange Optic pulse output Optic probe orange wire Black Optic thermistor ground Optic probe black wire Thermistor probe white wire Green Thermistor lead 1 Thermistor probe black wire Green Thermistor lead 2 Thermistor probe black wire 10 For dual trailer applications wire the optic portion of the two cont...

Page 9: ...nd then snap on the cap 14 Record the truck unit number compartment number and the level of the rack shutdown point in the IMPORTANT OPERATOR INFORMATION area on the front page of the SEELEVEL gauge users manual The truck operator must be given the owners manual upon delivery with all front page data filled in The following wiring diagram illustrates a B train with a single compartment lead equipp...

Page 10: ...t flash If not the module is defective If it does flash the gauge alarm point 4 is not working it may need to be programmed or serviced Fiber Cable If the module produces a light pulse but it does not reach the controller replace the fiber cable Controller If the controller is non permissive check to make sure it is receiving light pulses from the fiber s Dual controllers need pulses from both fib...

Page 11: ...ection For a thermistor rack if the diagnostic LED is on in the controller then the socket connection is good For an optic rack the pulse input and output are not monitored since the pulse width is so small the LEDs would not be visible so even though the LED is on there may still be a connection problem ...

Page 12: ...LIMITATION ON WARRANTIES These warranties are the only warranties expressed or implied upon which products are sold by Garnet and Garnet makes no warranty of merchantability or fitness for any particular purpose in respect to the products sold Garnet products or parts thereof assumed to be defective by the purchaser within the stipulated warranty period should be returned to the seller local distr...

Page 13: ...Page 13 688 Manual ...

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