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I want to measure the temperature of a liquid which is running inside a steel pipe. The temperature can be, at most, 200℃. I want to measure the temperature of that liquid using a sensor/thermometer placed on the outer surface of a pipe, and i need to connect this sensor/thermometer to an Arduino.

From the Arduino, I need to get temperature data which will be shown in a web application.

I have heard about the MLX90614 infrared Thermometer, but it supports only up to 125℃. I need an industry grade sensor for my requirement. Can anyone suggest any other options?

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    \$\begingroup\$ Why does your application require a contactless thermometer? What's the reason why a contact thermometer wouldn't work? \$\endgroup\$ – Nick Alexeev Nov 8 '17 at 2:01
  • \$\begingroup\$ Pretty much anything you attach to the outside of the pipe is going to be measuring the temperature of the outside of the pipe, not whatever is inside the pipe. \$\endgroup\$ – brhans Nov 8 '17 at 2:48
  • \$\begingroup\$ contactless sensor will do the same. ... you will have to get the sensor inside the pipe \$\endgroup\$ – jsotola Nov 8 '17 at 3:43
  • \$\begingroup\$ Look for something like the Cooper-Atkins 54011-K on Amazon. Wrap the pipe with insulation over the thermocouple for extra accuracy. \$\endgroup\$ – R Drast Nov 8 '17 at 9:53
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You would get a more accurate result by inserting a probe into the pipe.

If you want to use an external probe, a thermocouple or an RTD in a block than is strapped to be in intimate contact with the pipe and well insulated from the outside environment should give reasonable results for a permanent installation. A stick-on thermocouple with insulation could be used, but the adhesive may not hold up.

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