Airmar HT200 - Manual (Page 4)

4 Copyright © 2005 - 2011 Airmar Technology Corp. All rights reserved.
Using the Long Blanking Plug
To protect the paddlewheel/temperature insert, use the long 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 instrument.
1. Place the INSERT nut on the top of the long blanking plug. Attach the pull ring
to the plug, capturing the insert nut (see Figure 3).
2. Inspect the O-rings on the long blanking plug (replace if necessary) and
lubricate them with the silicone lubricant supplied or petroleum jelly
(Vaseline®). The O-rings must be intact and well lubricated to make a
watertight seal.
3. Remove the paddlewheel/temperature 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 nut.
4. Grasp the pull ring and remove the insert with a slow pulling motion.
NOTE: In the unlikely event that the insert cannot be removed, see
“Servicing the Valve Assembly” on page 3.
5. Slide the long 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 tighten.
6. Reattach the safety wire to prevent the long blanking plug from backing
out in the unlikely event that the insert nut and/or cap nut fails or is
screwed on incorrectly (see Figure 2).
Servicing the Valve Assembly
Should the valve fail, remove it for servicing. Order a replacement
Paddlewheel & Valve Kit No. 33-536-01.
WARNING: When the valve assembly is removed, always insert the short
emergency plug secured with the CAP nut and safety wire for a watertight
seal.
WARNING: If the insert is caught in the valve assembly trapping the CAP
nut, 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 (3') from the insert to free the CAP nut. Later, splice the cable using
Airmar’s splash-proof Junction Box No. 33-035.
1. Remove the short emergency plug from the safety wire (see Figure 2).
2. Inspect the O-ring (replace if necessary) and lubricate it with silicone
lubricant or petroleum jelly (Vaseline ® ) (see Figure 3). The O-ring must
be intact and well lubricated to make a watertight seal.
3. Unscrew the CAP nut. With the short emergency plug ready in one
hand, remove the paddlewheel/temperature 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 boat.
Note: The short emergency plug is not secure until the CAP nut is in place.
4. To free the CAP nut, remove the paddlewheel/temperature insert from
the valve assembly by unscrewing the INSERT nut. Grasp the insert by
the pull ring and pull slowly upward.
5. Secure the short emergency plug with the cap nut. Hand tighten only.
Do not overtighten. Reattach the safety wire (see Figure 2).
6. Clean, repair, or replace the valve assembly, so the flap valve moves
freely and seats against the valve housing (see Figure 3).
7. To reinstall the valve assembly and paddlewheel/temperature insert,
inspect (replace if necessary) and lubricate all of the O-rings with
silicone lubricant or petroleum jelly (Vaseline®). The O-rings must be
intact and well lubricated to form a watertight seal.
8. Remove 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
CAP nut in place hand tighten only. Do not over tighten.
9. Reinstall 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
bow.) 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 tighten.
10.Attach 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 and/or cap nut fails or is screwed on
incorrectly (see Figure 2).
ST850: Servicing the Paddlewheel Insert
Aquatic growth can impede or freeze the paddlewheel’s rotation and must
be removed. Clean the sensor with mild household detergent and a Scotch-
Brite® 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 wet/dry paper.
The water lubricated paddlewheel bearings have a life of up to 5 years on
low-speed boats [less than 10kn (11MPH)] and 1 year on high-speed
vessels. Paddlewheels can fracture and shafts can bend due to impact
with water borne objects and mishandling in boat yards. O-rings must be
free of abrasions and cuts to ensure a watertight seal. Order a
replacement Paddlewheel, Shaft & O-ring Kit No. 33-113.
1. Using the new paddlewheel shaft, push the old shaft out about
6mm (1/4"). With pliers, remove the old shaft (see Figure 3).
2. Place 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.
3. Tap the new shaft into place until the ends are flush with the insert.
4. Install two of the small O-rings.
5. The remaining two small O-rings are for the long blanking plug.
6. To reinstall the paddlewheel insert, see “Installing” on page 2 and follow
steps 8 through 10.
Winterizing
After 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 it.
Replacement Sensor & Parts
The 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 one.
Lost, 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.
Part Airmar Part Number
Blanking Plug 33-522-01
Paddlewheel, Shaft, O-ring Kit 33-113
Valve & Paddlewheel Kit
33-536-01
Cap Nut 04-234-1 (plastic)
02-131-01 (bronze)
Hull Nut 04-004 (plastic)
02-030 (bronze)
02-570-01
(stainless steel)
Isolation Bushing 04-186-1
Housing, Hull Nut & Washer 33-100 (bronze, low profile, B17)
33-224-01 (bronze, flush, B21)
33-217 (plastic, flush, P217)
33-092-01 (plastic, flush, P314)
33-495-01 (stainless steel, low profile, SS577)
Obtain parts from your instrument manufacturer or marine dealer.
Gemeco
Tel: 803.693.0777
(USA) Fax: 803.693.0477
email: [email protected]
Airmar EMEA Tel: +33.(0)2.23.52.06.48
(Europe, Middle East, Africa) Fax: +33.(0)2.23.52.06.49
email: [email protected]
NMEA 2000 Specification
HT200 Load Equivalency Number (LEN).................................1
AIRMAR
®
TECHNOLOGY CORPORATION
35 Meadowbrook Drive, Milford, New Hampshire 03055-4613, USA
www.airmar.com