Temperature Controller

[oskar270]

I plan to get a Chinese set for a 1.5KW, 110VAC input power VFD along with a water cooled spindle. To cool the spindle I will get a 12VDC or 110VAC water pump and I would like to have a temperature control to power OFF the spindle if the temperature of the spindle gets above a set range (usually 35-40C). I prefer to measure the spindle temperature and not the water



All of the temperature controllers I find on eBay have a metal probe to measure the temperature and this probe is not suitable to attach to the spindle. I prefer to have something like a paper thin film which it will be much easier to wrap around the spindle.



Ideas and suggestions on how to proceed are appreciated

 

[alec_t]

Don't know if this would work, but how about use a pair of IR diodes as photo-detectors; one aimed to pick up IR from the spindle and the other used a a reference/compensator picking up ambient radiation? Feed their outputs into a differential amp.

 

[spec]

Hi oskar270,

Here is an infrared off-the-shelf, non-contact temperature sensor:
**broken link removed**

This uses a similar principle to Alec's suggestion of post #2.

spec

 

[oskar270]

Thank you both for the help



spec, I don’t know how accurate / reliable is an infrared device especially with the dust the spindle will create but I suspect it’s pretty good



However my knowledge in electronics is pretty limited but I can manage if someone tells me what to do. Besides this sensor breakout I would also like to have a digital readout for the temperature and a wiring schematic of how to connect all together



A complete unit of the self would have been better for me but I’m willing to go ahead if someone can tell me what to do. Is it possible?

 

[spec]

Infrared temperature monitoring is a well proven, widely used technique which would be reliable. Within, reason I doubt that debris will affect the temperature reading significantly.

The simplest approach would be to use an Arduino microcontroller with the shield (input/output module) of post #3 and a digital readout shield. In addition you would need a 5V power supply. These are all inexpensive items that would simply plug together. As you are in Canada component procurement will not be a problem.

The Arduino would also need a simple script (program).

The best way to get the job done would be to contact a hobbyist or technical person to do the job for you.

spec

 

[oskar270]

Thanks again spec for your time but I don’t know anybody with knowledge of electronics and a local technical person will cost a lot for such a small job.

I will keep searching until I find what I’m looking for

 

[schmitt trigger]

Spec; reading the datasheet for the device you suggested, I found this golden nugget:

Table 5 summarizes the ideal output codes for different input signals. Figure 6 illustrates code transitions versus input voltage. Full-scale is a 5.12 mV signal. The LSB size is 156.25 nV.

Bold letters are mine.
156 nanovolts resolution! WOW!

 

[spec]

Spec; reading the datasheet for the device you suggested, I found this golden nugget:

Table 5 summarizes the ideal output codes for different input signals. Figure 6 illustrates code transitions versus input voltage. Full-scale is a 5.12 mV signal. The LSB size is 156.25 nV.

Bold letters are mine.
156 nanovolts resolution! WOW!

Excellent:

spec