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M.ABBAS
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Join Date: May 2014
Posts: 10

Joint for LHS (Linear Heat Sensor) Cable

09/03/2014 1:32 AM

Good morning everybody ...I want to ask you about LHS Cable (Linear Heat Sensor) .. We are using it to detect any possible fire at the floating roof of our CRUDE OIL TANK. Now I have a problem that the (Cooper cable) thats connect LHS to junction box was damaged and I want to make a joint for it. my question is:Is it possible to make a traditional joint using my hands only or I need a certified connector to do this joint ?
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Tornado
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#1

Re: Joint for LHS (Linear Heat Sensor) Cable

09/03/2014 1:55 AM

I would twist-splice and solder each conductor and sleeve it with heat-shrink tubing; then sleeve the whole assembly with larger heat-shrink tubing. At an opportune time, it would be good to replace the whole cable.

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M.ABBAS
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#5
In reply to #1

Re: Joint for LHS (Linear Heat Sensor) Cable

09/03/2014 2:47 AM

Many thanks for your great suggestion but in the data sheet it is forbidden to use heat shrink one ! is it possible to do it normally just connect to wires together and cover it with normal tape ! or it is not possible due to hazardous area ?
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Crabtree
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#2

Re: Joint for LHS (Linear Heat Sensor) Cable

09/03/2014 1:56 AM

Tell me about the hazardous area classification, Murphy. Which zone is it in, and what are the explosion protection arrangements for the circuit?

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M.ABBAS
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#3
In reply to #2

Re: Joint for LHS (Linear Heat Sensor) Cable

09/03/2014 2:39 AM

It is zone 0, very hazardous area due to H2S high concentration availability !
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Crabtree
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#4
In reply to #3

Re: Joint for LHS (Linear Heat Sensor) Cable

09/03/2014 2:42 AM

Well that makes it an Ex ia circuit. Yes?

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M.ABBAS
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#6
In reply to #4

Re: Joint for LHS (Linear Heat Sensor) Cable

09/03/2014 2:48 AM

Yes exactly !
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Crabtree
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#7
In reply to #6

Re: Joint for LHS (Linear Heat Sensor) Cable

09/03/2014 2:59 AM

No problem joining the cable with a temporary splice, then, though as Tornado pointed out above, it would be good to replace the cable at an early opportunity. It's wonderful what barriers can do for you.

Hurrah for Ex i!

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M.ABBAS
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#8
In reply to #7

Re: Joint for LHS (Linear Heat Sensor) Cable

09/03/2014 3:09 AM

* You are right ! it is great to change the cable but unfortunately we dont have spare one !

* I am using I.S Barrier right now and I am afraid if I do normal splice and the weather in my area is very hot and temperature is about 50C, the normal splice may get hot and I have high H2S gas concentration !!!

Are you sure I can do the normal splice ?!

MANY THANKS for your support.
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Crabtree
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#9
In reply to #8

Re: Joint for LHS (Linear Heat Sensor) Cable

09/03/2014 4:35 AM

The splice cannot get significantly hotter from the current flowing in the circuit, Murphy, as it is limited by the barrier.

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Tornado
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#10
In reply to #3

Re: Joint for LHS (Linear Heat Sensor) Cable

09/03/2014 8:05 AM

Because of this improperly delayed information, I am marking my first post off-topic.

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WJMFIRE
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#11

Re: Joint for LHS (Linear Heat Sensor) Cable

09/03/2014 8:32 AM

LHS is a trade name, but is used often in a generic sense.

Is your line heat sensor cable of the integrating type or the shorting type?

This question cannot be answered without this information.

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Crabtree
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#12

Re: Joint for LHS (Linear Heat Sensor) Cable

09/03/2014 11:06 AM

Do grab yourself some training in hazardous area electrical practice, Matey.

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Users who posted comments:

Crabtree (5); M.ABBAS (4); Tornado (2); WJMFIRE (1)

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