Temp Sending Unit on Heat Riser - how to test? - SailNet Community

   Search Sailnet:

 forums  store  


Quick Menu
Forums           
Articles          
Galleries        
Boat Reviews  
Classifieds     
Search SailNet 
Boat Search (new)

Shop the
SailNet Store
Anchor Locker
Boatbuilding & Repair
Charts
Clothing
Electrical
Electronics
Engine
Hatches and Portlights
Interior And Galley
Maintenance
Marine Electronics
Navigation
Other Items
Plumbing and Pumps
Rigging
Safety
Sailing Hardware
Trailer & Watersports
Clearance Items

Advertise Here






Go Back   SailNet Community > On Board > Gear & Maintenance
 Not a Member? 
  #1  
Old 05-21-2009
Senior Member
 
Join Date: Feb 2008
Posts: 161
Thanks: 1
Thanked 0 Times in 0 Posts
Rep Power: 7
preservedkillick is on a distinguished road
Temp Sending Unit on Heat Riser - how to test?

I've got a temperature sending plug on the heat rider coming off the back of my Vetus engine with no wire connected to it. I'm trying to figure out which wire connects to the spade connector on the sending unit, not (yet) if the sending unit works. The wire according to the wiring schematics that should connect, is not, but is connected to a plug on the engine pan (the very bottom)?

What I'd like to do is see if I can trigger the high temp alarm using that wire, but I'm not quite understanding how the sending unit works. With just a single wire, I'm assuming the sending unit closes a circuit by grounding the wire lead to the engine block?? If I take the wire and touch it to ground, shouldn't the alarm activate??

Am I close?

-Preserved.
__________________
Preserved Killick


To view links or images in signatures your post count must be 10 or greater. You currently have 0 posts.

Seagrass
Boothbay Harbor, ME
Alberg 30:
To view links or images in signatures your post count must be 10 or greater. You currently have 0 posts.
Reply With Quote Share with Facebook
  #2  
Old 05-21-2009
tommays's Avatar
Senior Member
 
Join Date: Sep 2008
Posts: 4,248
Thanks: 1
Thanked 25 Times in 25 Posts
Rep Power: 7
tommays will become famous soon enough
There is generally a sender that that changes Resistance to control the gauge and if you touch the CORRECT wire to the block the gauge should move

And a separate unit with a switch that would run the alarm at the temp that is to hot
__________________
1970 Cal 29 Sea Fever

To view links or images in signatures your post count must be 10 or greater. You currently have 0 posts.

1981 J24 Tangent 2930
Tommays
Northport NY


If a dirty bottom slows you down what do you think it does to your boat
To view links or images in signatures your post count must be 10 or greater. You currently have 0 posts.
Reply With Quote Share with Facebook
  #3  
Old 05-22-2009
Senior Member
 
Join Date: Apr 2009
Posts: 103
Thanks: 0
Thanked 1 Time in 1 Post
Rep Power: 6
lshick is on a distinguished road
Send a message via Skype™ to lshick
There are two types of senders: those that drive a gauge, and those that drive an alarm. tommays is correct about the behavior of a sender that drives a gauge. In many cases, a sender that drives an alarm is mounted on the ground side of the alarm circuit; in case of an overheating situation, the switch inside the sender closes to complete the circuit to ground.

I have tested the alarm on my boat by touching the wire to ground, as you suggested.
__________________
Larry Shick
V42-148 "Moira"
To view links or images in signatures your post count must be 10 or greater. You currently have 0 posts.
Reply With Quote Share with Facebook
  #4  
Old 05-22-2009
Senior Member
 
Join Date: Feb 2008
Posts: 161
Thanks: 1
Thanked 0 Times in 0 Posts
Rep Power: 7
preservedkillick is on a distinguished road
Thanks guys, it's a single wire. I'll test by grounding.
__________________
Preserved Killick


To view links or images in signatures your post count must be 10 or greater. You currently have 0 posts.

Seagrass
Boothbay Harbor, ME
Alberg 30:
To view links or images in signatures your post count must be 10 or greater. You currently have 0 posts.
Reply With Quote Share with Facebook
Reply


Currently Active Users Viewing This Thread: 1 (0 members and 1 guests)
 
Thread Tools

 
Posting Rules
You may post new threads
You may post replies
You may post attachments
You may edit your posts

BB code is On
Smilies are On
[IMG] code is On
HTML code is On


Similar Threads
Thread Thread Starter Forum Replies Last Post
Sending Unit for DET MAR Fuel Gage ABullard Gear & Maintenance 3 01-29-2003 05:14 AM
Heat Emergencies William Mahaffy Seamanship Articles 0 12-18-1998 07:00 PM
Heat Emergencies William Mahaffy Her Sailnet Articles 0 12-18-1998 07:00 PM


All times are GMT -4. The time now is 01:25 PM.

Add to My Yahoo!         
Powered by vBulletin® Version 3.8.7
Copyright ©2000 - 2014, vBulletin Solutions, Inc.
SEO by vBSEO 3.6.1
(c) Marine.com LLC 2000-2012

The SailNet.com store is owned and operated by a company independent of the SailNet.com forum. You are now leaving the SailNet forum. Click OK to continue or Cancel to return to the SailNet forum.