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Paul Eckenroth
Joined: 29 Jun 2010
Posts: 14
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 Posted: Fri Sep 09, 2016 11:06 am Post subject: Thermocouple construction |
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I need to create CHT thermocouples for use in a VW engine. The engine has small diameter holes drilled in the head with a set screw perpendicular to secure the thermocouple. The drilled hole is just large enough to allow a dsub male pin to be inserted. Since I already have old CHT probes as used on a Lycoming, my plan is to cut off the existing too large probe and insert the two stripped wires into the dsub, crimp, and insert into the hole and secure with the set screw. Since I am not an expert on thermocouples, I would like to know if this is a valid approach. Is the crimp enough to form the thermocouple. Should solder be used, etc. All information will be appreciated. Thanks.
Paul
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kjashton(at)vnet.net
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| Posted: Fri Sep 09, 2016 12:33 pm Post subject: Thermocouple construction |
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It’s only required that you twist the wires together and they make good contact with the engine but silver-solder will make them a little more robust. I made a little writeup here on how to make them for a Lycoming
http://www.canardzone.com/forum/topic/31152-homemade-cht-bayonet-sensor/#entry58923
-Kent
| Quote: | On Sep 9, 2016, at 3:06 PM, Paul Eckenroth <jeckenroth(at)nbn.net> wrote:
I need to create CHT thermocouples for use in a VW engine. The engine has small diameter holes drilled in the head with a set screw perpendicular to secure the thermocouple. The drilled hole is just large enough to allow a dsub male pin to be inserted. Since I already have old CHT probes as used on a Lycoming, my plan is to cut off the existing too large probe and insert the two stripped wires into the dsub, crimp, and insert into the hole and secure with the set screw. Since I am not an expert on thermocouples, I would like to know if this is a valid approach. Is the crimp enough to form the thermocouple. Should solder be used, etc. All information will be appreciated. Thanks.
Paul
Read this topic online here:
http://forums.matronics.com/viewtopic.php?p=460375#460375
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ceengland7(at)gmail.com
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| Posted: Fri Sep 09, 2016 2:05 pm Post subject: Thermocouple construction |
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You do need to pay attention to whether your gauge/monitor expects grounded or ungrounded probes. (Some may allow you to select which you're using, but some don't.)
Charlie
On Fri, Sep 9, 2016 at 3:27 PM, Kent or Jackie Ashton <kjashton(at)vnet.net (kjashton(at)vnet.net)> wrote:
| Quote: | --> AeroElectric-List message posted by: Kent or Jackie Ashton <kjashton(at)vnet.net (kjashton(at)vnet.net)>
It’s only required that you twist the wires together and they make good contact with the engine but silver-solder will make them a little more robust. I made a little writeup here on how to make them for a Lycoming
http://www.canardzone.com/forum/topic/31152-homemade-cht-bayonet-sensor/#entry58923
-Kent
> On Sep 9, 2016, at 3:06 PM, Paul Eckenroth <jeckenroth(at)nbn.net (jeckenroth(at)nbn.net)> wrote:
>
> --> AeroElectric-List message posted by: "Paul Eckenroth" <jeckenroth(at)nbn.net (jeckenroth(at)nbn.net)>
>
> I need to create CHT thermocouples for use in a VW engine. The engine has small diameter holes drilled in the head with a set screw perpendicular to secure the thermocouple. The drilled hole is just large enough to allow a dsub male pin to be inserted. Since I already have old CHT probes as used on a Lycoming, my plan is to cut off the existing too large probe and insert the two stripped wires into the dsub, crimp, and insert into the hole and secure with the set screw. Since I am not an expert on thermocouples, I would like to know if this is a valid approach. Is the crimp enough to form the thermocouple. Should solder be used, etc. All information will be appreciated. Thanks.
>
> Paul
>
>
>
>
> Read this topic online here:
>
> http://forums.matronics.com/viewtopic.php?p=460375#460375
>
>
>
>
>
>
>
>
>
>
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rickofudall
Joined: 19 Sep 2009
Posts: 1392
Location: Udall, KS, USA
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| Posted: Sat Sep 10, 2016 3:21 pm Post subject: Thermocouple construction |
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Thanks Kent, for a nifty how-to. I'll file that one away with my AEC manual
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N509RV(at)eckenroth.com
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| Posted: Sat Sep 10, 2016 5:03 pm Post subject: Thermocouple construction |
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Thanks for the comments. Sounds like all I need to do is twist the wires, insert in hole and pinch with set screw. The dsub will only make it a bit more sophisticated.
Paul
On Sat, Sep 10, 2016 at 7:20 PM, Richard Girard <aslsa.rng(at)gmail.com (aslsa.rng(at)gmail.com)> wrote:
| Quote: | Thanks Kent, for a nifty how-to. I'll file that one away with my AEC manual.
Rick Girard
On Fri, Sep 9, 2016 at 3:27 PM, Kent or Jackie Ashton <kjashton(at)vnet.net (kjashton(at)vnet.net)> wrote:
| Quote: | --> AeroElectric-List message posted by: Kent or Jackie Ashton <kjashton(at)vnet.net (kjashton(at)vnet.net)>
It’s only required that you twist the wires together and they make good contact with the engine but silver-solder will make them a little more robust. I made a little writeup here on how to make them for a Lycoming
http://www.canardzone.com/forum/topic/31152-homemade-cht-bayonet-sensor/#entry58923
-Kent
> On Sep 9, 2016, at 3:06 PM, Paul Eckenroth <jeckenroth(at)nbn.net (jeckenroth(at)nbn.net)> wrote:
>
> --> AeroElectric-List message posted by: "Paul Eckenroth" <jeckenroth(at)nbn.net (jeckenroth(at)nbn.net)>
>
> I need to create CHT thermocouples for use in a VW engine. The engine has small diameter holes drilled in the head with a set screw perpendicular to secure the thermocouple. The drilled hole is just large enough to allow a dsub male pin to be inserted. Since I already have old CHT probes as used on a Lycoming, my plan is to cut off the existing too large probe and insert the two stripped wires into the dsub, crimp, and insert into the hole and secure with the set screw. Since I am not an expert on thermocouples, I would like to know if this is a valid approach. Is the crimp enough to form the thermocouple. Should solder be used, etc. All information will be appreciated. Thanks.
>
> Paul
>
>
>
>
> Read this topic online here:
>
> http://forums.matronics.com/viewtopic.php?p=460375#460375
>
>
>
>
>
>
>
>
>
>
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