From: "Charlie England ceengland7@gmail.com" <flyrotary@lancaironline.net>
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Subject: Re: [FlyRotary] thermocouple
To: Rotary motors in aircraft <flyrotary@lancaironline.net>
References: <list-12840431@logan.com>
Message-ID: <81daa50a-147c-c59b-466e-a580f4d70148@gmail.com>
Date: Sun, 11 Aug 2019 21:26:23 -0500
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On 8/11/2019 8:56 PM, Neil Unger 12348ung@gmail.com wrote:
> Gents, Nothing to do with flying, but you may be able to assist.  I 
> have numerous trash pumps that need a thermocouple linked to a 3 Phase 
> cutout.  Yes I can buy a stock unit for over $3000 each which to me is 
> as hot as the pump can get.  All I need is a switch that will cut out 
> the pump (power) when it overheats due to dry running.  If it doesn;t 
> the pump then self destructs and $6000 later I am ready to go 
> again.    I can however get replacement pumps from china for $500 but 
> without the cutout.
>
> So simple heat sensor switch that will go open at preset temp high 
> setting, say 90 - 100 degrees  C .  Possibly single phase to disconect 
> 3 phase contactor.  Suggestions??>
>
> Neil.
How about a 'snap switch'?
https://www.google.com/search?q=snap+switch+thermostat&rlz=1C1CHBF_enUS843US843&oq=snap+switch&aqs=chrome.4.69i57j0l5.7136j0j7&sourceid=chrome&ie=UTF-8
They're used in everything from furnaces to coffee makers here in the USA.

Charlie

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