Airmar st850 installtion maintenance 17 422 01
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Aquatic growth can accumulate rapidly on the sensors surface reducing performance within weeks Surfaces exposed to salt water must be coated with antifouling paint Use waterbased antifouling paint only Never use ketonebased paint since ketones can attack many plastics possibly It is easier to apply antifouling paint before installing the sensor but allow sufficient drying time Reapply paint every 6 months or at the beginning of each boating season Paint the following surfaces see Figure 1Bore of the valve assembly up 30mm 114Exterior flange of the housing and valve plug below the lower Oring including the exposed endTemperature insert below the lower Oring including the exposed endPaddlewheel insertOutside wall below the lower fiberglass hullFollow separate instructions on page 4 1Drill a 3mm or 18 pilot hole from inside the hull If there is a rib strut or other hull irregularity near the selected mounting location drill from the outside2Using the appropriate size hole saw cut a hole perpendicular to the hull from outside the boatFlush housingUse a countersink tool to create a seat in the hull3Sand and clean the area around the hole inside and outside to ensure that the sealant will adhere properly to the hull If there is any petroleum residue inside the hull remove it with either mild household detergent or a weak solvent alcohol before sandingMetal hullRemove all burrs with a file and Be sure the surfaces to be bedded are clean and dryApply a 2mm 116 marine sealant around the flange of the housing that will contact the hull and up the sidewall of the housing see The sealant must extend 6mm 14igher than the combined thickness of the hull washer and hull nut This will ensure there is sealant in the threads to seal the hull and to hold the hull nut securely in placeStainless steel housing in a metal hullThe stainless steel housing must be isolated from the metal hull to prevent electrolytic corrosion Slide the isolation bushing onto the housing Apply sealant to the t the hull filling any cavities in and around the If your sensor came with a connector do not remove it to ease cable routing If the cable must be cut and spliced use Airmars splashproof Junction Box No 33035 and follow the instructions provided Removing the waterproof connector or cutting the cable except when using a watertight junction box will void the sensors warranty1From outside the hull push the housing into the mounting hole using a twisting motion to squeeze out excess sealant see Figure 2Align the arrow on the flange of the housing to point forward toward the bownot installed on the centerline angle the housing slightly toward the centerline to align it with the water flow2From inside the hull slide the washer onto the steel housing in a metal hullBe sure the washer contacts the hull Do not tighten the hull nut with the washer against the isolation bushing as the housing will not be firmly installed If necessary sand the isolation bushing until the washer rests against the hull3Screw the hull nut in place being sure the notch on the upper rim of the housing and the corresponding arrow on the flange are still positioned forward toward the bow Plastic housingDo not clamp tightly on the wrenching flats possibly causing the housing to hull nutHand tighten only Do not over tightenMetal hull nutTighten with slipjoint pliersCored fiberglass hullDo not over tighten crushing the hullWood hullAllow the wood to swell before tightening the hull nut4Remove any excess marine sealant on the outside of the hull to ensure smooth water flow over the sensor5After the marine sealant cures inspect the Orings on the valve assembly replace if necessary and lubricate them with the silicone lubricant supplied see Figure 3he Orings must be intact and well lubricated to make a watertight seal6Slide the valve assembly into the housing Seat it into place with a pushing twisting motion until the key fits into the notch Screw the CAP nut in place and hand tighten only Do not over tightenFigure 2 Bedding and installing ST850 shownmetal housing in hullmarine sealantpull insertsafety wirehull plugon flange and steel housing in hulland sidewall of housingmarine sealant on flangeSS577 showninsert nutCopyright 2005 2010 Airmar Technology CorpP17 shownB17 shownof housingand isolation bushing where it contacts hullFigure 1 Antifouling paint ST850 lowprofile housing of valve assembly exterior flange outside 30mm Oring below valve assembly of housing andCopyright 2005 Airmar Technology CorpFigure 3 side ofshaftblade housingflap of arrow on nutmedium 2005 2010 Airmar Technology Corpof insert toward the insert nut along the cable until it rests on the top of the insert Attach the pull ring to the insert capturing the insert nut8Inspect the Orings on the insert replace if necessarynd lubricate them with the silicone lubricant supplied9Slide the insert into the housing Seat it into place with a pushing twisting motion until the key fits into the notch Be careful not to rotate the housing and disturb the sealant Screw the INSERT nut in place and only Do not over tightenThe paddlewheel insert must have the arrow on the top pointing forward toward the bow The cable exit points away from the bow 10Always attach the safety wire to prevent the insert from backing out in the unlikely event that the insert nut andor cap nut fails or is screwed on incorrectly see Figure 2Plastic housingAttach the safety wire securely to one eye in the nut Thread the short emergency plug onto the wire Keeping the wire taut throughout lead the wire in a direction and thread it through one eye in the CAP nut Thread the wire through the eye a second time Then lead the wire in a direction and thread it through the eye in the INSERT nut Thread the wire through the eye a second time Loop the wire through the pull ring and twist the wire securely to itselfMetal housingWrap one end of the safety wire tightly around the housing and twist it together with the long end Thread the short emergency plug onto the wire Keeping the wire taut throughout lead the wire straight up and through one eye in the CAP nut Thread the wire through the eye a second time Lead the wire in a direction and thread it through the eye in the INSERT nut Thread the wire through the eye a second time Loop the wire through the pull ring and twist the wire securely to itself11Route the cable to the instrument being careful not to tear the cable jacket when passing it through the bulkheads and other parts of the boat Use grommets prevent chafing To reduce electrical interference separate the sensor cable from other electrical wiring and the engine Coil any excess cable and seto prevent damage Refer to the instrument owners manual to connect the sensor to the Into ST650 HousingThe HT200 and ST850 insert can be installed in a new or existing ST650 housing However the ST650 valve assembly inside the housing must be replaced with the HT200ST850 valve assembly so the new insert will fit To replace the valve assembly follow the instructions Servicing the Valve Assembly on page 4Checking for LeaksWhen the boat is placed in the water immediately check around the thruhull sensor for leaks Note that very small leaks may not be readily Do not leave the boat in the water for more than 3 hours before checking it again If there is a small leak there may be considerable bilge water accumulation after 24 hours If a leak is observed repeat Bedding and Installing immediately see page 2Installation in a Cored Fiberglass HullThe core wood or foamst be cut and sealed carefully The core must be protected from water seepage and the hull must be reinforced to prevent it from crushing under the hull nut allowing the housing to become looseCAUTION Completely seal the hull to prevent water seepage into the core1Drill a 3mm or 18 pilot hole from inside the hull If there is a rib strut or other hull irregularity near the selected mounting location drill from the outside If the hole is drilled in the wrong location drill a second hole in a better location l over the incorrect hole and fill it 2Using the 51mm or 2 hole saw cut the hole from outside the hull through the seeFigure 43From inside the hull use the 60mm or 238 hole saw to cut through skin and most of the core The core material can be very soft Apply only light pressure to the hole saw after cutting through the inner skin to avoid accidentally cutting the skin4Remove the plug of core material so the inside of the outer skin and the inner core of the hull are fully exposed Sand and clean the inner skin core and the outer skin around the hole5If you are skilled with fiberglass saturate a layer of fiberglass cloth with a suitable resin and lay it inside the hole to seal and strengthen the core Add layers until the hole is the correct a hollow or solid cylinder of the correct diameter can be coated with wax and taped in place Fill the gap between the cylinder and hull with casting epoxy After the epoxy has set remove the cylinder6Sand and clean the area around the hole inside and outside to ensure that the sealant will adhere properly to the hull If there is any petroleum residue inside the hull remove it with either mild household detergent or a weak solvent alcohole with Bedding and Installing on page 2Operation MaintenanceHow the Valve WorksThe valve is not a watertight seal The sensor incorporates a selfclosing valve which minimizes the flow of water into the vessel when the insert is removed The curved flap valve is activated by both a spring and water pressure Water pushes the flap valve upward to block the opening so there is no gush of water into the boat Always install the insert or the long blanking plug secured with the INSERT nut and safety wire for a watertight 4 Preparing a cored fiberglass hull inner skinouter skinsolid or hollow cylinderpour in epoxy912 mm3812larger than the hole through thehulls outer skinhull 2005 Airmar Technology CorpCopyright 2005 2011 Airmar Technology Corp All rights reserved Using the Long Blanking PlugTo protect the insert use the blanking plug when the boat will be kept in salt water for more than a week when the boat will be removed from the water or when aquatic growth buildup on the insert is suspected due to inaccurate readings from the the INSERT nut on the top of the blanking plug Attach the pull ring to the plug capturing the insert nut see Figure 32Inspect the Orings on the blanking plug replace if necessaryand lubricate them with the silicone lubricant supplied or petroleum jelly Vaseline The Orings must be intact and well lubricated to make a watertight seal3Remove the insert from the housing by removing the safety wire from the pull ring and the INSERT nut Unscrew the INSERT nut see Figure 2 Do not remove the CAP nut4Grasp the pull ring and remove the insert with a slow pulling motion In the unlikely event that the insert cannot be removed see Servicing the Valve Assembly on page 35Slide the blanking plug into the housing see Figure 3 Seat it into place with a pushing twisting motion until the key fits into the notch Screw the INSERT nut in place and hand tighten only Do not over the safety wire to prevent the blanking plug from backing out in the unlikely event that the insert nut andor cap nut fails or is screwed on incorrectly see Figure 2Servicing the Valve AssemblyShould the valve fail remove it for servicing Order a replacement Paddlewheel Valve Kit No 3353601 When the valve assembly is removed always insert the short emergency plug secured with the CAP nutand safety wire for a watertight sealWARNING If the insert is caught in the valve assembly trapping the CAP temporarily hold the short emergency plug in place with the safety wire Then separate the insert from the valve assembly If they cannot be separated and the sensor must be left unattended remove the pull ring unscrew the insert nut and unscrew the cap nut Cut the cable a minimum of 1m 3from the insert to free the CAP nut Later splice the cable using Airmars splashproof Junction Box No 330351Remove the short emergency plug from the safety wire see Figure 2 2Inspect the Oring replace if necessary and lubricate it with silicone lubricant or petroleum jelly Vaselinesee Figure 3 The Oring must be intact and well lubricated to make a watertight seal3Unscrew the CAP nut With the short emergency plug ready in one hand remove the insert and valve assembly as one unit by pulling upward on the pull ring Rapidly insert the short emergency plug to minimize the flow of water into the boatNote The short emergency plug is not secure until the CAP nut is in place4To free the CAP nut remove the insert from the valve assembly by unscrewing the INSERT nut Grasp the insert by the pull ring and pull slowly upward5Secure the short emergency plug with the cap nut Hand tightenDo not overtighten Reattach the safety wire see Figure 26Clean repair or replace the valve assembly so the flap valve moves freely and seats against the valve housing see Figure 37To reinstall the valve assembly and insert inspect replace if necessary and lubricate all of the Orings with silicone lubricant or petroleum jelly VaselineThe Orings must be intact and well lubricated to form a watertight seal8Remove the safety wire from the CAP nut and unscrew it With the valve assembly ready in one hand remove the short emergency plug Rapidly slide the valve assembly into the housing Seat it into place with a pushing twisting motion until the key fits into the notch Screw the hand tighten only Do not over the insert Be sure the paddlewheel insert has the arrow on the top pointing forward toward the bow The cable exit points away from the bowSeat it into place with a pushing twisting motion until the key fits into the notch Screw the INSERT nut in place and hand tighten only Do not over the safety wire to the short emergency plug the cap nut the insert nut and the pull ring to prevent the insert from backing out in the unlikely event that the insert nut andor cap nut fails or is screwed on incorrectly see Figure 2ST850 Servicing the Paddlewheel InsertAquatic growth can impede or freeze the paddlewheels rotation and must be removed Clean the sensor with mild household detergent and a ScotchBrite scour pad If fouling is severe push out the paddlewheel shaft using a spare shaft or a 4D finish nail with a flattened point Then lightly wet sand the paddlewheel with fine grade wetdry paperThe water lubricated paddlewheel bearings have a life of up to 5 years on lowspeed boats less than 10kn 11MPHvessels Paddlewheels can fracture and shafts can bend due to impact with water borne objects and mishandling in boat yards Orings must be free of abrasions and cuts to ensure a watertight seal Order a replacement Paddlewheel Shaft Oring Kit No 331131Using the new paddlewheel shaft push the old shaft out about 6mm 14 With pliers remove the old shaft see Figure 32Place the new paddlewheel in the cavity with the flat side of the blade facing the same direction as the arrow on the top of the insert 3Tap the new shaft into place until the ends are flush with the insert4Install two of the small Orings5The remaining two small Orings are for the blanking plug6To reinstall the paddlewheel insert see Installing on page 2 and follow steps 8 through the boat has been hauled for winter storage remove the blanking plug to let the water drain away before reinserting it This will prevent any water from freezing around the blanking plug and possibly cracking itReplacement Sensor PartsThe information needed to order a replacement Airmar sensor is printed on the cable tag Do not remove this tag When ordering specify the part number and date For convenient reference record this information at the top of page oneLost broken and worn parts should be replace immediately If you have purchased a plastic housing and have a wood hull or desire greater strength purchase an Airmar metal housing If you have a low profile housing and prefer a flush housing see the following list PartAirmar Part NumberBlanking Shaft Oring Kit33113Valve Paddlewheel Kit3353601Cap Nut04004 plastic02030 steelIsolation Hull Nut Washer 33100bronze low profile flush flush flush steel low profile SS577Obtain parts from your instrument manufacturer or marine dealer GemecoTel EMEATel 3300648Europe Middle East 2000 Load Equivalency Number LEN1TECHNOLOGY CORPORATION35 Meadowbrook Drive Milford New USA wwwairmarcom EF HHEFa aHHEF a FHHEFa a aHHEFa fHHEFa aaHH E D ZQX DY QX MDY QX DY EhD EEadPQXEDYCcbB ECDCCe ia D QXDzzYYFFaH EDEDEeE j Bhja RyE TXYaDRy E I c a a CC5vp E PXaYddbQXdd EDYKTX FH FHYYCXddadQX FH Fab pE PXaFYhBQSZX TXCBYQX TXCBYTX 345415560 ccGviDiDhimn Q399dq2XO8 namebbYPpostY0 dEeE bch aeeDdD acEeE bch CEeE bch aeeDCD KEeE bch rev 04020111withUS Patents 7110908 7352171 UK 2 409 527Connect the sensor to the instrument Check for the approximate air temperature If it has a paddlewheel spin it and check for a speed reading If there is no readings or it is inaccurate check the connections and try again If there is still a problem return the product to the place of Record the information found on the cable tag for future referencePart housing recommended for fiberglass or metal hulls only install a plastic housing in a wood hull since swelling of the wood may overstress the plastic causing a fractureBronze housing recommended for fiberglass or wood hull only mount a bronze housing in a metal hull because electrolytic corrosion will occurStainless steel housing compatible with all hull for aluminum hulls to prevent electrolytic corrosion provided the stainless steel housing is isolated from the metal hullTools antifouling paint mandatory in salt waterElectric drill with 10mm 38 or larger chuck capacityDrill bit3mm Hole saw51mm 2 plastic or metal housing in nonmetal hull57mm 214 stainless steel housing in a metal tool installing a flush household detergent weak solvent such as alcoholFile installation in a metal hulle for below pliers installing a metal some in a cored fiberglass hull see page 4Hole saw for hull interior60mm 238Fiberglass cloth and resin Cylinder wax tape and casting epoxyMounting Do not mount in an area of turbulence or bubbles near water intake or discharge openings or behind strakes fittings or hull Never mount the speed sensor directly ahead of a depth transducer since turbulence generated by the paddlewheels rotation will adversely affect the transducers performance especially at high speeds Choose an accessible spot inside the vessel Allow a minimum of 280mm 11eadroom for the height of the housing tightening the nuts and removing the insertHT200The sensor must be in contact with the water at all water must flow over the paddlewheel at all boat Displacement hull amidships near the hull well aft to ensure the sensor is in contact with the water at high speedsFin keel sailboatsMount on or near the centerline and forward of the fin keel 300600mm 12Full keel amidships and away from the keel at the point of minimum GUIDE Follow the precautions below for optimal product performance and to reduce the risk of property damage personal injury andor deathWARNING Always wear safety goggles and a dust mask when The valve is not a watertight seal Always use the insert or the blanking plug secured with the safety wire for a WARNING The Orings must be intact and well lubricated to make a watertight attach the safety wire to prevent the sensor insert or blanking plug from backing out in the unlikely event that the cap nut fails or is screwed on Immediately check for leaks when the boat is placed in the water Do not leave the boat unchecked for more than three hours Even a small leak may allow considerable water to Stainless steel housing in a metal hullBe sure the washer contacts the hull Do not tighten the hull nut with the washer against the isolation bushing as the housing will not be firmly Never install a metal housing in a vessel with a positive ground systemCAUTION Never use a fairing with a plastic housing the protruding sensor would be vulnerable to damage from impactCAUTION Never pull carry or hold the sensor by its cable this may sever internal Never use solvents Cleaners fuel sealants paint and other products may contain strong solvents such as acetone which attack many plastics greatly reducing their A stainless steel housing must be isolated from a metal hull to prevent electrolytic Please read the instructions completely before proceeding with the installation These instructions supersede any other instructions in your instrument manual if they differlow profileP17 c cdusy0X0K9B999 ISXe8e8Y dSX RXb 88YYI dSX RXb ISXe8e8Y ISX88Y10Y16 1FyuxAM6IwXN99 136ACINPRakr PXe c
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