Thermistor vs. Thermocoupler Probe

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Texasbowhunter
has a junk pile that will one day smoke LOTS of BBQ
has a junk pile that will one day smoke LOTS of BBQ
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Thermistor vs. Thermocoupler Probe

Post by Texasbowhunter » November 2nd, 2018, 12:44 pm

I have gotten most of my materials together for my DIY temperature controller to control the temp in my CC...
Now I have come to a road block and have to lean on you guys that may have been down the road I am about to partake on...
Have a question now on the temperature probe...
This is the description of the temperature controller I have...Which has a temperature probe sold with it...I would use it however I am concerned since it seems to have a plastic sheathing around it, it will not stand up to the temps the smoker would be delivering for extended amounts of time...
plus the data I had added says for BBQ use get a different temperature probe...

Product description
Size:10A 110VAC
Package included:
1 x Digital Temperature Controller
1 x NTC 100K Cylindrical Metal Temperature Sensor with 1 meter cable
English Manual
Notice: If you want to use this temperature controller for BBQ, you have to purchase one barbecue probe.
For Controlling temperature on electric BBQ, Grill, Smoker, Oven, Stove, Drying Oven,Thermal shrink Tunnel, Heat sealing machine, .... in the temp range -22 to 572 °F (-30 to 300 °C) FeaturesDigital temperature controller, -30 to 300 °C (or -22~572 °F) temperature measurement and control
Display resolution of 0.1 degrees, 1 degree control resolution
Optional cooling or heating mode
1-25 degree adjustable hysteresis
Delay start function, 0-30 minutes adjustable
The lower range limit temperature adjustment function
Down with the data storage function,
Relay shock current 10A/220V. Reliable operation resistive load maximum 1000W, 600W maximum inductive load
The machine maximum power consumption: less than 2W
Measurement error: less than ± 1 °C
Working temperature: -20 °C ~ 80 °C Electrical Performance:
Temperature control range: -30 ~ 300 Celsius / -22~572 Fahrenheit
Temperature measurement error: ± 1 Celsius
Sensor Type: NTC 100K or, B=3950
Display Resolution: 0.1
Control accuracy: 1 Celsius
Supply Voltage for thermostat: 110VAC
Current: MAX 200MA
Relay contact current: AC 10A/220V

So the question I have is can I use a thermocouple or do I have to use a thermistor probe...

If I use a thermocouple will the unit be able to measure the temperatures accuratly?
From what I understand the thermocouple is more accurate then the thermistor...
I want to get the best accurate reading possible quickly I would think...
I have found some probes that claim they are thermocoupler thermistor (both)
Can I trust they will be accurate for my application in reading varying temps accuately and quickly?

Thanks for the guideness
Paul



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pr0wlunwoof
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Re: Thermistor vs. Thermocoupler Probe

Post by pr0wlunwoof » November 2nd, 2018, 1:43 pm

A thermistor is a temperature-sensitive resistor, whilst a thermocouplegenerates a voltage proportional to the temperature. Thermocouples can work at much higher temperatures thanthermistors. ... The thermistor works based on the principle that the electrical resistance of this material changes with temperature

Either will work good for this application. I have been using k-type thermocouples as they are easily found on amazon. Occasionally I will test them in boiling water to make sure they are still accurate as I do not treat them very delicately.

Here is one like I use for pit temp:

https://www.google.com/url?sa=t&source= ... tMUzuSD68I

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Re: Thermistor vs. Thermocoupler Probe

Post by Weldun » November 2nd, 2018, 5:32 pm

If my memory serves me correctly when I built my controller I purchased the "k" type probe only to find it wasn't compatible with the NTC100K type controller. Below is what I ended up using, I cut the plug off and used different connectors. I purchased some fuse clips to mount the probe inside smoke chamber. If you're interested shoot me a pm with your address and I'll send you some of the clips, I only needed two fuse clips but had to purchase a bag of them so I'd be more than happy to help your cause.

I used a piece of banding material to make the bracket that fuse clips are mounted to.

https://www.ebay.com/itm/361542105849?l ... noapp=true

https://www.amazon.com/Hillman-Group-50 ... BK3EGJC3TY

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pr0wlunwoof
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Re: Thermistor vs. Thermocoupler Probe

Post by pr0wlunwoof » November 3rd, 2018, 8:30 am

Fuse clip. Great idea. Off to search Amazon.

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Re: Thermistor vs. Thermocoupler Probe

Post by Pete Mazz » November 3rd, 2018, 10:10 am

I use magnetic hooks


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