GARNET 688-S Crude Oil Thermistor Rack Control Owner’s Manual
- June 8, 2024
- GARNET
Table of Contents
GARNET 688-S Crude Oil Thermistor Rack Control
INTRODUCTION
Congratulations TI ACKâ„¢on purchasing the Garnet Instruments Model 688
represents the state of the art in multi-function overfill control for
transport applications. The MULTIRACK TM 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 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 -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.
OPERATIONS AND FEATURES
Overview
For the 810PS2 SEELEVEL™ gauge, the MULTIRACK™ system consists of a 688M
MULTIRACK™ Driver Module and, 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.
Driver Module Operation
The 688M MULTIRACK™ Driver Module contains only the optical transmitter for the MULTIRACK™ , since 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 : 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 goes to permit only if the light pulse is present. The fiber cable is used to provide electrical isolation between the SeeLeveL and the intrinsically safe wiring of the loading rack. The controller will only accept light pulses from a 688M module; it cannot be fooled by ambient light or the output from a sender bar. The controller operates entirely from rack power; it contains no batteries, and will function only when connected to an optic or thermistor rack.
- If the truck has two trailers, then one controller is required per trailer, since the fiber optic cable cannot be connected between trailers. The single controller has one fiber input, and it is used for single compartment applications. The dual controller has two fiber inputs, and it is used for two compartment applications, and both fiber inputs must receive light pulses for the controller to permit.
- The controller can operate either an optic (five wire) or a thermistor (two wire) loading rack. If the application 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 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, providing excellent sealing against weather conditions, as well as visibility of the diagnostic LEDs.
- The cover of the controller is illustrated on the front page.
- The OPTIC diagnostic LED indicates proper connection to the optic rack, it will illuminate whenever the ground and red power wires are connected, regardless of whether the controller is in permit or not. The OPTIC LED does not indicate whether the yellow or orange pulse leads are connected.
- The THERM A and THERM B diagnostic LEDs indicate proper connection to the thermistor rack, regardless of whether the controller is in permit or not. If only one of the thermistor leads is used, then only its corresponding LED will illuminate.
- The PERMIT diagnostic LED will light when the controller is in permit and is connected to either an optic or thermistor rack. It will not illuminate if the controller is not connected, since the rack is the controller power source.
WARNING : 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 consists of 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 sockets(s). Verification of system operation completes the installation.
- Install the SeeLeveL/SeeLeveL Special systems as described in their respective manuals.
- Make sure that the correct controller has been chosen. For applications with a single compartment per trailer, use the single fiber input model. For two compartments per trailer, use the dual fiber input model. One controller is needed for each individual trailer.
- Pick a spot to mount the controller and the rack socket(s). They should be close together, easy to access, and out of direct road spray.
- Drill and tap holes into the controller enclosure for the needed connections. There will be one hole for the fiber from the gauge, and at least one for the wiring to the rack socket(s). Make sure that none of the entries are at the top of the box, since the LEDs will get in the way of the wires and water is more likely to leak in from the top. Also, make sure that the holes are located to allow room for the cap to fully seat, since it sticks into the box by about 3/8”. Be very careful when penetrating the box, the drill will want to shoot into the box once you break through the inside. If you drill off a wire or fiber connector it will NOT be covered by warranty.
- 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.
- Connect the 688M Driver Module into the gauge enclosure. For the 810PS2 SEELEVEL TM PROSERIES II gauge, the module is encapsulated into a small black box. Silicone this box into the left side of the aluminum enclosure. Before the silicone sets, make sure that the gauge faceplate can still seat properly. Connect the yellow module wire to the red Alarm 4 wire from the gauge and connect the black module wire to the green ground wire on the gauge. For the 808P2 SEELEVEL SPECIAL TM the module is not in a box. Simply use a spot of RTV to secure the module inside the enclosure. Connect the yellow wire on the module to the yellow wire from the gauge and the black module wire to the gauge’s black ground wire. You will need one module per gauge.
- Route 1/4” Nylon air brake hose from the gauge to the controller and fasten with brass inserts and compression 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.
- 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.
- 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 - 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.
- Refer to the proper gauge manual and program alarm point 4 as SHUT DOWN at the desired overfill point.
- 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.
- Inspect the controller enclosure cap for casting flash, and lightly sand or scrape off any casting protrusions. Make sure that the rubber O ring is in place and has grease on it. Orient the cap so that the holes for the LEDs line up with the holes in the label and then snap on the cap.
- 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 equipped with a SEELEVEL, and a dual compartment pup equipped with two
SEELEVEL SPECIALs.
TROUBLESHOOTING GUIDE
Overview
There are only 4 serviceable components to the system: the 688M module, the interconnecting fiber optic cable, the controller, and the third party rack sockets and wiring. Make sure that the compartment is in fact empty and that the SEELEVEL TM, or SEELEVEL SPECIAL TM gauges are working correctly. To test the various components, substitute a known good component to see if the rest of the system is working.
Driver Module
The battery in the 688M module should last for 10 years, and is not user serviceable. If the controller is non-permissive, check the light output from the module, it should flash about 4 times per second if the gauge is telling it to. If it is not flashing, connect the two wires from the 688M module together, this should make it 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 fibers to permit. If the optic or thermistor diagnostic LEDs are on, but the permit light is off when the controller is receiving light pulses, replace the controller.
- If the controller diagnostic LEDs are not on, check for voltage (using a voltmeter) at the optic red wire or green thermistor wire. If the controller is getting power and ground, but does not light, 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 is getting thermistor power but does not produce a pulse, replace the controller.
Rack Socket
The most likely cause of a non-permit situation is a bad rack socket connection. 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.
SERVICE AND WARRANTY INFORMATION
The warranty will only apply if the warranty has been registered online from the Garnet Instruments registration web page.
Go online to support.com/ and select “Register Warranty”.
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 will start from the date of purchase or installation as indicated on the warranty card. Under these warranties, Garnet shall be responsible only for actual loss or damage suffered and then only to the extent of Garnet’s invoiced price of the product. Garnet shall not be liable in any case for labor charges for indirect, special, or consequential damages. Garnet shall not be liable in any case for the removal and/or reinstallation of defective Garnet equipment. These warranties shall not apply to any defects or other damages to any Garnet equipment that has been altered or tampered with by anyone other than Garnet factory representatives. In all cases, Garnet will warrant only Garnet products which are being used for applications acceptable to Garnet and within the technical specifications of the particular product. In addition, Garnet will warrant only those products which have been installed and maintained according to Garnet factory specifications.
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
distributor, or directly to Garnet for evaluation and service. Whenever direct
factory evaluation, service or replacement is necessary, the customer must
first, by either letter or phone, obtain a Returned Material Authorization
(RMA) from Garnet Instruments directly. No material may be returned to Garnet
without an RMA number assigned to it or without proper factory authorization.
Any returns must be returned freight prepaid to: Garnet Instruments, 286 Kaska
Road, Sherwood Park, Alberta, T8A 4G7. Returned warranted items will be
repaired or replaced at the discretion of Garnet Instruments. Any Garnet items
under the Garnet Warranty Policy that are deemed irreparable by Garnet
Instruments will be replaced at no charge or a credit will be issued for that
item subject to the customer’s request.
If you do have a warranty claim or if the equipment needs to be serviced,
contact the installation dealer. If you do need to contact Garnet, we 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
References
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