Thermocouple Identification

[supercub]

I would like to source a thermocouple with the following rating, or as close as possible, in a strip type configuration. Could anyone identify this style of thermocouple? It is a plastic rectangle, 8.67mm X 25.45mm X 1mm thickness. It has two solder pads. This would be used in temp feedback in a ceramic glass induction cooktop. The spec below was originally a package style 35 axial component but a strip type package would be more robust for the application.

PACKAGE STYLE:?

B VALUE: B = 4300K <MOD-PM> 1%
(CALCULATED FROM RESISTANCE AT 100°C AND 200°C)

RESISTANCE: R = 14.2K Ω <MOD-PM> 2%
(MEASURE 75<MOD-DEG>C IN OIL SPOT)

OPERATING TEMP. RANGE: -20°C ~ 200°C

Thanks!

 

[btrueblood]

That sounds like a spec. for a thermistor, not a thermocouple.

 

[supercub]

yes, a thermistor, sorry!

 

[btrueblood]

It sounds like a fairly custom part, due to the relatively high operating temperature (200 deg. C?) and rather large size. Not sure that anybody will quote a plastic package at that high of an operating temperature. Google should be able to give you a whole slew of thermistor manufacturers, and hopefully one of them will be interested in quoting the part for you. Try US Sensors (ussensor.com), for starters.

 

[IRstuff]

Why wouldn't you use a standard value resistance to buy it off the shelf? Unless your volume quantities are enormous, many suppliers will simply not bid.

TTFN
faq731-376

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[supercub]

The spec was from an axial thermistor at that operating temp and resistance value. The plastic (?) part was one that I pulled out of a similar unit. It is actually a lot more dense than plastic, maybe a ceramic? It has the appearance of plastic. So in a nutshell, I want to capture as much of the properties of the axial component spec as I can with a pad style thermistor.

 

[btrueblood]

I'd agree with IRStuff that you might have more luck finding an off-the-shelf thermistor that will fit your operating environment (temperature, size, etc.) and then jigger the sensing circuit (maybe two resistor values?) to match its characteristics.