Garnet MULTIRACK™ 688-S / 688-D Manual

Chapter 1: Introduction

Congratulations on purchasing the Garnet Instruments Model 688 MULTIRACK™ Optic / Thermistor Rack Control for Trucks. The 688 represents the state of the art in multi-function overfill control for transport applications. The MULTIRACK™ is used in conjunction with either a SEELEVEL™ or SEELEVEL SPECIAL™ truck gauge to allow trucks to load at facilities controlled by either optic style (five wire) and thermistor style (two wire) loading racks. The MULTIRACK™ will shut down the loading rack when the product level reaches the programmed shutdown point in the SEELEVEL™ gauge.

The MULTIRACK™ 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 -40°C to +60°C (-40°F to +140°F).

The MULTIRACK™ does not require any 12V truck power to operate; it functions entirely on battery and rack power. Built-in diagnostic lights simplify troubleshooting and monitor the connection to the loading rack.

Chapter 2: Operations and Features

Overview

For the 810PS2 SEELEVEL™ gauge, the MULTIRACK™ system consists of a 688M MULTIRACK™ Driver Module, a fiber optic interconnect cable, and a 688S (single compartment) or 688D (dual compartment) rack controller. The gauge module is installed inside the SEELEVEL™ and connected to alarm 4. For the 808P2 SeeLeveL Special gauge, only a 688M MULTIRACK™ Driver Module is needed. In both cases, the fiber optic cable carries a pulsed light signal from the module to the rack controller to tell it to permit loading. The rack controller is wired to the appropriate sockets for connection to the loading rack. When the gauge detects an overfill situation, the pulse light signal is turned off by the module and the rack controller goes to non-permit, which shuts down the loading rack.

Diagram Description: The page includes a diagram illustrating a truck tank trailer. It shows an "808-P2 SEELEVEL SPECIAL" gauge, an "810-X Bar", a "SPILLSTOP Controller 688 MULTIRACK", and "Rack Plugs Wired to MULTIRACK" connected to the loading rack. The diagram depicts the system's components and their general connection to a truck and loading rack.

Driver Module Operation

The 688M MULTIRACK™ Driver Module contains only the optical transmitter for the MULTIRACK™, as the SPILLSTOP™ module is built into the 808P2. The module mounts inside the 808P2 display enclosure and connects to the black ground wire and yellow alarm wire from the 808P2. Alarm 4 is programmed to operate the MULTIRACK™, the same as for the 810 model.

[Warning Symbol] The module must be wired correctly to ensure overfill protection is maintained when operated in conjunction with the 815-UHP SPILLSTOP system.

Rack Controller Operation

The rack controller connects to the module via fiber optic cable and permits loading only if the light pulse is present. The fiber cable provides electrical isolation between the SeeLeveL and the intrinsically safe wiring of the loading rack. The controller accepts light pulses only from a 688M module and cannot be fooled by ambient light or sender bar output. The controller operates entirely from rack power, containing no batteries, and functions only when connected to an optic or thermistor rack.

For trucks with two trailers, one controller is required per trailer, as the fiber optic cable cannot connect between trailers. A single controller has one fiber input for single compartment applications. A dual controller has two fiber inputs for two compartment applications, requiring light pulses from both fibers to permit.

The controller can operate either an optic (five wire) or a thermistor (two wire) loading rack. For two-trailer applications, the optic portions of two controllers are wired in series like optic probes. The controller has two thermistor leads to simulate two thermistor probes and operates with one or both leads connected. In two-trailer applications, each thermistor lead from the rack socket connects to its own controller. The controller simulates a two-wire thermistor regardless of product temperature; the third temperature compensation (rack green) lead is not used.

The controller is mounted in a round Betts junction box with a snap lid, offering excellent sealing against weather conditions and visibility of diagnostic LEDs. The cover of the controller is illustrated on the front page.

The OPTIC diagnostic LED indicates proper connection to the optic rack, illuminating when ground and red power wires are connected, regardless of permit status. It does not indicate connection of yellow or orange pulse leads.

The THERM A and THERM B diagnostic LEDs indicate proper connection to the thermistor rack, regardless of permit status. If only one thermistor lead is used, only its corresponding LED illuminates.

The PERMIT diagnostic LED lights when the controller is in permit and connected to an optic or thermistor rack. It does not illuminate if the controller is not connected, as the rack is the power source.

[Warning Symbol] To maintain overfill protection, the operator MUST verify float movement of the SeeLeveL™ (or SeeLeveL Special™) 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 involves connecting the appropriate module into the gauge and programming alarm point 4. The controller enclosure is mounted, connected via fiber optic cable to the module, and wired to the rack socket(s). Verification of system operation completes the installation.

Chapter 3: Installation Guide

1. Install the SeeLeveL/SeeLeveL Special systems as described in their respective manuals.
2. Ensure the correct controller is chosen. For single compartment trailers, use the single fiber input model. For two compartment trailers, use the dual fiber input model. One controller is needed for each individual trailer.
3. Select a mounting location for the controller and rack socket(s). They should be close together, easily accessible, and protected from direct road spray.
4. Drill and tap holes into the controller enclosure for connections. One hole is for the fiber from the gauge, and at least one for wiring to the rack socket(s). Ensure no entries are at the top of the box to prevent water ingress and interference with LEDs. Holes should allow the cap to seat properly (approx. 3/8" protrusion). Exercise caution when drilling; drilling through the box can damage wires or connectors, voiding the warranty.
5. Mount the controller enclosure using the provided mounting flange holes. Use the provided spacers to shim the enclosure away from the mounting surface, allowing for water drainage. Damaged enclosures due to water freezing behind them are NOT covered by warranty.
6. Connect the 688M Driver Module into the gauge enclosure. For the 810PS2 SEELEVEL™ PROSERIES II gauge, the module is encapsulated in a small black box; silicone this box into the left side of the aluminum enclosure, ensuring the faceplate can still seat properly. Connect the module's yellow wire to the gauge's red Alarm 4 wire and the module's black wire to the gauge's green ground wire. For the 808P2 SEELEVEL SPECIAL™, the module is not in a box; use RTV to secure it inside the enclosure. Connect the module's yellow wire to the gauge's yellow wire and the module's black wire to the gauge's black ground wire. One module is needed per gauge.
7. Route a 1/4" Nylon air brake hose from the gauge to the controller, securing with brass inserts and compression fittings. At the lowest point in the air line, insert a T fitting with approximately two feet of Synflex hanging down to drain any water. If a T fitting is not feasible, use a fitting at the bottom of the display enclosure and route the 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 and wire the rack socket(s) to the controller wires. The controller is wired as a probe. Verify the wiring pattern for the rack socket(s) 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
   Green	Thermistor lead #1	Thermistor probe white wire
   Green	Thermistor lead #2	Thermistor probe black wire

10. For dual trailer applications, wire the optic portion of the two controllers in series like 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. White probe ground leads from the socket connect to the controller black ground leads. Green temperature compensation probe leads from the socket are not connected.
11. Refer to the gauge manual and program alarm point 4 as SHUT DOWN at the desired overfill point.
12. Connect a sensor tester to each rack socket and verify proper rack shutdown by lifting floats or simulating float movement with a programmer.
13. Inspect the controller enclosure cap for casting flash; lightly sand or scrape off any protrusions. Ensure the rubber O-ring is in place and greased. Orient the cap so LED holes align with label holes, then snap on.
14. Record the truck unit number, compartment number, and shutdown point level in the IMPORTANT OPERATOR INFORMATION area on the SEELEVEL gauge user manual's front page. The truck operator must receive the owner's manual with all front page data filled in upon delivery.

Diagram Description: The page includes a diagram illustrating a B-train with a single compartment lead equipped with a SEELEVEL, and a dual compartment pup equipped with two SEELEVEL SPECIALS. It shows the "SINGLE RACK CONTROLLER" (810-PS2 with 688 Module, 688S Rack Controller) and "DUAL RACK CONTROLLER" (Compartment 2: 808-P2 with 688 Module, Compartment 3: 808-P2 with 688 Module, 688-D Rack Controller). It also details the wiring connections via "Fiber Optic Cable" to "Optic Rack Plug" (Red-Power, Black-Ground, Orange-Output Pulse, Yellow-Input Pulse) and "Thermistor Rack Plug" (Common Ground, Probe #3, Probe #2, Probe #1).

Chapter 4: Troubleshooting Guide

Overview

The system has four serviceable components: the 688M module, the interconnecting fiber optic cable, the controller, and third-party rack sockets and wiring. Ensure the compartment is empty and the SEELEVEL™, or SEELEVEL SPECIAL™ gauges are functioning correctly. To test components, substitute a known good component to identify issues in the rest of the system.

Driver Module

The 688M module battery is rated for 10 years and is not user serviceable. If the controller is non-permissive, check the module's light output; it should flash approximately 4 times per second if the gauge is signaling it. If it does not flash, connect the two wires from the 688M module together; this should make it flash. If it still does not flash, the module is defective. If it flashes, the gauge alarm point 4 may not be working and might need programming or servicing.

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, verify it is receiving light pulses from the fiber(s). Dual controllers require pulses from both fibers to permit. If the optic or thermistor diagnostic LEDs are on, but the permit light is off while receiving light pulses, replace the controller.

If the controller diagnostic LEDs are off, check for voltage (using a voltmeter) at the optic red wire or green thermistor wire. If the controller has power and ground but does not light up, replace it.

If the controller shows permit but does not allow loading, check the wiring around the controller. If the controller does not pass the optic pulse, or if it receives thermistor power but does not produce a pulse, replace the controller.

Rack Socket

A bad rack socket connection is the most common cause of a non-permit situation. For a thermistor rack, if the controller's diagnostic LED is on, the socket connection is good. For an optic rack, pulse input and output are not monitored (due to small pulse width making LEDs invisible), so an illuminated LED does not guarantee a connection problem-free.

Chapter 5: Specifications

688 DISPLAY

SAFETY INFORMATION

Compliance and Certifications

CAN ICES-001(A)/NMB-001(A)

This device complies with part 15 of the FCC Rules. Operation is subject to the following two conditions: (1) This device may not cause harmful interference, and (2) this device must accept any interference received, including interference that may cause undesired operation.

Changes or modifications not expressly approved by the party responsible for compliance could void the user's authority to operate the equipment.

This product can expose you to chemicals including Nickel and Lead, which are known to the State of California to cause cancer, and lead which is known to the State of California to cause birth defects or other reproductive harm. For more information go to www.P65Warnings.ca.gov.

Chapter 6: Service and Warranty Information

For warranty claim process information, refer to the support page on the website: www.garnetinstruments.com/support/

DISCLAIMER OF WARRANTY ON HARDWARE

Garnet Instruments warrants equipment manufactured by Garnet to be free from defects in material and workmanship under normal use and service for a period of three years from the date of sale from Garnet or an Authorized Dealer. The warranty period starts from the date of purchase or installation as indicated on the warranty card. Garnet is responsible only for actual loss or damage suffered, up to Garnet's invoiced price of the product. Garnet is not liable for labor charges for indirect, special, or consequential damages, nor for the removal and/or reinstallation of defective Garnet equipment. These warranties do not apply to defects or damages caused by alteration or tampering by anyone other than Garnet factory representatives. Garnet warrants only its products used in applications acceptable to Garnet and within their technical specifications. Garnet also warrants only products installed and maintained according to Garnet factory specifications.

LIMITATION ON WARRANTIES

These warranties are the sole express or implied warranties for products sold by Garnet. Garnet disclaims any warranty of merchantability or fitness for any particular purpose. Garnet products or parts assumed to be defective within the warranty period should be returned to the seller, local distributor, or directly to Garnet for evaluation and service. For direct factory evaluation, service, or replacement, the customer must first obtain a Returned Material Authorization (RMA) from Garnet Instruments directly via letter or phone. No material may be returned to Garnet without an RMA number or proper factory authorization. Returns must be sent freight prepaid to: Garnet Instruments, 286 Kaska Road, Sherwood Park, Alberta, T8A 4G7. Returned warranted items will be repaired or replaced at Garnet Instruments' discretion. Irreparable Garnet items under warranty will be replaced at no charge or a credit issued, subject to customer request.

For warranty claims or service needs, contact the installation dealer. If direct contact with Garnet is necessary, they can be reached as follows:

CANADA

Garnet Instruments
286 Kaska Road
Sherwood Park, AB T8A 4G7
CANADA
email: info@garnetinstruments.com

UNITED STATES

Garnet US Inc.
5360 Granbury Road
Granbury, TX 76049
USA
email: infous@garnetinstruments.com