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Installing Temperature Sensor on Hot metal

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Hi

Can somebody guide me how can I install a temperature senor on a metallic body which be having temperature more than 200°C? Also what type of sensor would be suitable?
 

You could try one of the large retailers (Farnell, Newark, TME) and look for sensors that withstand 200+*C temperatures.

I'd try to find one with a metal case and mount it with screws (rather than some adhesive) since it's a more permanent way of having it mounted.
 

Sorry, one important point I missed.
My requirement is not to fix the thermocouple to the metal body. You can think of the subject metal body being treated on a small platform. During the treatment, the temperature has to be monitored. After that the body is replaced by another one.

An infrared thermometer can do the job but, the temperature is required to be displayed on panel in some control room.
 

**broken link removed**

Something like that, maybe?
 

Yes, like that!
But, I assume the normal circuit used with a contact-type thermocouple cannot be used with this sensor.
 

The Melexis pyrometer has a digital interface and can't be connected to a thermometer designed for usual RTD or TC sensors.

But there's a basic problem in measuring metal surfaces with pyrometers, particularly at "low" non-blazing temperatures. Clean (shiny) metals have a low emissivity, they tend to show rather a reflected ambient temperature than their own surface. The emissivity can be calibrated, but it must be expected to vary depending on the surface condition, e.g. dirt and oxide presence. So the contactless IR measurement will be rather inaccurate.

A spring loaded contact thermometer (e.g. a capillary thermocouple) is most likely a better solution.
 
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Measuring metal surfaces with pyrometers

FvM said:
But there's a basic problem in measuring metal surfaces with pyrometers, particularly at "low" non-blazing temperatures. Clean (shiny) metals have a low emissivity, they tend to show rather a reflected ambient temperature than their own surface...
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This is not related to the original post, and I don't mean to hijack the thread. But in some cases, it could help to paint or anodize the metal surface black to reduce the amount of reflected ambient temperature seen by the pyrometer. Right?
 
But in some cases, it could help to paint or anodize the metal surface black to reduce the amount of reflected ambient temperature seen by the pyrometer. Right?
Click to expand...

Yes, that helps a lot. It's a practical method when measuring the temperature of electronic parts with metallic surface by an IR thermometer or a thermo camera. Even sticking a coloured piece of paper or "tesa" film (transparent in visible range, but opaque in far IR) to the surface can help.

Unfortunately, it's not good for a production process, I fear.
 
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