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Measuring resistance of heaters

Created by: steve_u at: 9/18/2020 11:07 AM (4 Replies)

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9/18/2020 11:07 AM	Rate (0)
steve_u Posts: 3 Rating: (0)	I'm wanting to set up a test rig for heater blocks with 5x 300W heaters in them. How can I convert the resistance of the heaters into an analogue input so I can test they are within tolerance. I could just use a thermocouple input to test the temp of the actual block but that would not show the individual elements, plus the H&S issues with hot lumps of metal sat on the bench in the workshop. Thanks all. <><
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9/18/2020 11:12 AM	Rate (0)
ixo65 Grandmaster-Expert Joined: 12/18/2014 Last visit: 12/3/2023 Posts: 31538 Rating: (3919)	Buy a multimeter with which you can carry out resistance measurements. That is the simplest solution.

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9/18/2020 11:29 AM	Rate (0)
steve_u Posts: 3 Rating: (0)	We have loads of heaters that we go through every day all on Harting plugs and I wanted to just build a test box that the engineers could just plug them in and press a button to say they are all ok. I work in an injection moulding and extrusion factory and just trying to reduce the work the guys have to do.
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9/18/2020 11:41 AM	Rate (1)
ixo65 Grandmaster-Expert Joined: 12/18/2014 Last visit: 12/3/2023 Posts: 31538 Rating: (3919)	For the LOGO! there is no module with which no direct resistance measurements can be carried out. Only voltage signals 0-10V or current signals 0 / 4-20mA can be evaluated. If your LOGO! Base module has no analog inputs, you need an analog extension module AM2. Then you could build a voltage divider with an appropriate series resistor, which is in a row to the test object. This voltage divider is then connected to e.g. 24 VDC and measures the voltage parallel to the test object.

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9/18/2020 11:52 AM	Rate (0)
steve_u Posts: 3 Rating: (0)	Perfect, thank you. Steve
steve_u Posts: 3 Rating: (0)
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This contribution was helpful to 1 thankful Users ixo65

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