User Manual - Offshore Systems
Contents
1. is in contact with water the sender will cease to transmit the actual fuel level and send tank empty and tank full alternatively to attract the users attention to the fuel gauge associated with the contaminated tank The user should drain the water out of the contaminated tank and refill with clean fuel This should remove the water from the probe tube which will then revert to transmitting the actual tank level In the event that the sender is still transmitting the tank empty tank full signal this means the water contamina tion was severe enough to be forced into the fuel probe tube In this case the sender will need to be demounted from the tank and have the probe outer tube removed and cleaned internally and the probe inner cleaned Re assemble and remount in the normal way SETTING THE INSTANCE When the unit is installed the small rotary switch should be set to reflect the fuel tank number The NMEA2000 standard allows for up to 16 different fuel tanks to be installed on a single network and these should be selected by using switch positions 0 for the first tank 1 for the second tank up to 15 for the sixteenth tank Once the module has been installed there is no normal operator intervention required The unit has a blue LED which flashes every time the sender transmits a signal If this is not flashing it means that the unit is not receiving power from the network or that no other device is connected to the network Set Rotary Dial2. at the desired location and mark the central hole and the 5 mounting bolt holes using a pencil through the holes in the gasket Please note that the gasket holes are NOT arranged symmetrically The 3271N fuel sender is mounted using a standard American 1 2 NPT Tapered National Pipe Thread threaded mount The 3271T fuel sender is mounted using a standard 1 BSP British Standard Pipe threaded mount with O ring seal 1 2 MEASURING AND CUTTING SENDER TO LENGTH Carefully measure the depth of the tank vertically from the top surface of the tank through the probe hole to the level of the fuel pickup tube near the bottom of the tank Measure from the underside of the sender body and mark the required probe length on the probe outer tube using an indelible marker Using a sharp hacksaw cut through the probes outer tube and inner rod to length TOGETHER Do NOT use a pipe cutter or an angle grinder which could close the outer tube and restrict fuel flow into the tube Ensure that the cut is clean and deburred inside the tube as any swaff traped inside the tube could the affect the reading This may require the dismantling cleaing and reasembaling of the tube if necessary Support both ends of Fuel Sender O 6 Install the new black plastic insulator supplied in the bag about 5mm oe from the end of the inner rod so it that tyhe rod cannot touch the outer tube It is ESSENTIAL to ensure that the fuel can flow into the tube easily and f
3. www osukl com Copyright 2013 Offshore Systems UK Ltd All rights reserved Our policy is one of continuous product improvement so product specifications are subject to change without notice Offshore Systems products are designed to be accurate and reliable However they should be used only as aids to vessel monitoring and not as a replacement for traditional navigation and vessel monitoring techniques NMEA2000 is a registered trademark of the National Marine Electronics Association DOC NO 00000 Rev 1 0
4. VOLUMETRIC FUEL SENDER INSTALLATION AND OPERATING INSTRUCTIONS Ohare Part Numbers 3271 xxxx SAE 5 Bolt Mounting 3271N xxxx 1 5 NPT Thread Mount Rotary Switch 3271 T xxxx 1 25 BSP Mounting xxxx is probe length in millimeters LED Indicator Magnet Area Make certain sender and fuel Fuel tank container pickup are at the same level SAFETY WARNING Fuel sender should only be installed by a person competent and experienced in working with electrical systems and fuel tanks All work involving fuel tanks should be performed with extreme care due to the possibility of igniting fuel fumes THE TANK MUST BE EMPTY DRY AND PURGED OF ALL FUMES BEFORE COMMENCING WORK IF YOU FAIL TO DO THIS YOU ARE EXPOSING YOURSELF TO A POTENTIALLY FATAL HAZARD Before beginning work the battery should be disconnected to avoid the risk of a short circuit a fire or explosion EP INSTALLATION Choosing the Sender location Choose a location on the top surface of the fuel tank that e Is over the deepest part of the tank e is clear of any internal baffles e is flat and level e is within reach of an inspection hatch to facilitate mounting e Allows installation of the Fuel Sender without bending it 1 1 SENDER MOUNTING OPTIONS The 3271 Sender is available with three different standard mounting options The original 3271 fuel sender is mounted using a standard 5 bolt SAE mount To mark the SAE 5 bolt holes place the cork mounting gasket
5. aining tank LEVEL as a percentage or the remaining tank VOLUME as a percentage The 3271 can be user or factory programmed with up to 100 points of volumetric information and to transmit the remaining fuel VOLUME percentage if the user chooses This can then be shown on any NMEA2000 Fuel Level Display The user can do this volume calibration using the 3340 Colour Multifunction Display or it can be done by Offshore Systems from tank drawings or from a 3D CAD model 3 1 SELECTING VOLUME OR LEVEL MODE When the unit is transmitting the tank LEVEL the blue LED will give a SINGLE flash every 2 5 seconds When the unit is transmitting the tank VOLUME the blue LED will give a DOUBLE FLASH every 2 5 seconds The unit can be switched from LEVEL to VOLUME mode very easily By setting the rotary switch to C and applying the magnet as before the unit will transmit the tank LEVEL This will show a single flash By setting the rotary switch to D and applying the magnet as before the unit will transmit the tank VOLUME This will show a double flash Do not forget to set the rotary switch to the tank instance or number after doing this see section 4 If the unit has NOT been programmed with tank volume information then setting it to transmit volume will send the normal tank level information for safety 3 2 WATER IN FUEL DETECTION The fuel sender will detect the presence of water in the fuel and alert the user to the problem If the probe tube
6. reely The probe CANNOT measure the fuel level unless the fuel has easy access INTO the probe tube 1 3 MOUNTING THE SENDER TO THE TANK Either mount the 3271 5 bolt SAE sender and the gasket to the tank using 5mm bolts washers spring washers and nuts Apply some suitable sealant to the washers and bolt heads Tighten the bolts progressively around the circumference of the sender to ensure a liquid tight seal Or mount the 3271N or T threaded sender to it s threaded mounting point and screw down until the O ring makes a good seal or the taper thread is firmly seated CAUTION ALWAYS OBSERVE THE FUEL TANK DURING INITIAL FILLING AND OPERATION TO ENSURE THERE ARE NO LEAKS AT THE SENDER MOUNT 1 4 WIRING AND NETWORK The plug on the fuel sender cable should be mounted into a T adaptor on the NMEA2000 network as shown in the following diagram Ensure that it is mated securely and the retaining ring has been tightened correctly to ensure the junction is waterproof Note that this cable length may be extended to a maximum of 6 metres by using micro drop cables To display 3804 Male NMEA2000 Network Backbone Terminator XK QO RRR SY 0 0000 3271 Fuel Sender 250 3000mm TANK LEVEL CALIBRATION The sender MUST be calibrated to the empty tank AND to the full tank before it can give an accurate reading It will NOT be accurate until both steps are done This is a simple two step process 2 1 CALIBRATING TO THE EMPTY TANK The
7. sender must be calibrated to the empty tank value either with the sender in the empty tank or if it is not possible to empty the tank with the sender hanging vertically next to the tank Apply power to the network turn the small rotary switch to E and then applying a small magnet to the top of the sender at the marked point When the sender detects the magnet it will light the blue LED for 2 5 seconds and will then measure and remember the empty calibration value Set Rotary Dial to E Set empty level with a Magnet Do not touch the metal casing of the device ue during calibration amma LED stays on for 2 5 seconds 2 2 CALIBRATING TO THE FULL TANK The sender must then be calibrated to the full tank value either with the sender in the full tank or if it is not possible to fill the tank with the sender hanging vertically in a tube of fuel to the desired full level next to the tank Apply power to the network turn the small rotary switch to F and then applying a small magnet to the top of the sender at the marked point When the sender detects the magnet it will light the blue LED for 2 5 seconds and will then measure and remember the full calibration value Set Rotary Dial to F Set full level with a Magnet Do not touch the metal casing of the device during calibration LED stays on for 2 5 seconds TANK VOLUME CALIBRATION The 3271 Volumetric Fuel sender can be set to either transmit the rem
8. to desired instance 5 TROUBLE SHOOTING If the sender is sending inaccurate readings then this can ONLY be due to either 1 The fuel is not free to travel up inside the tube due to a blockage at the bottom of the probe or a blockage of the air release hole s at the top of the tube 2 The tank LEVEL calibration has been done incorrectly There can be no other cause than these The principle of operation of the sender is based on simple physics and providing the fuel has free access and the calibration has been done correctly the unit will ALWAYS read correctly Check power is provided to network Check cable runs have not been damaged LED does not flash No display equipment connected to LED flashes rapidly receive data Probe is shorted out remove tube and check for swarf and probe insulator is fitted Water contamination see Water in Fuel Detection Fuel level alternates from 0 to 100 Check each rotary switch is addressed to an individual tank instance and the display is set to receive the corresponding tank instance Check the display is capable of displaying multiple tanks FI have multiple tanks but only 1 is displayed Carry out Tank Level Calibration Fuel level is not reading correctly process Offshore Systems UK Ltd Unit 10 11 Milton Business Centre Wick Drive New Milton Hampshire BH25 6RH United Kingdom Tel 44 0 1425 610022 Fax 44 0 1425 614794 Email mail osukl com Web
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