Hello,
I have a tank where I need to monitor the fryer oil (up to 500F). I have the ability to weld a bung if needed.
Is there a food grade sensor that would be appropriate for a cooking oil application?
Thank in advance for your help!
You can get a Temperature Sensors | Thermometrics and assemple it in a stainless steel tube like https://create.arduino.cc/projecthub/dbarbee/temperature-controled-charcoal-smoker-58db49 see The Build section.
Use a PT-100 sensor . It widely available. For example - Amazon.com
Then you need an amplifier. I'd recommend this one - Adafruit PT100 RTD Temperature Sensor Amplifier - MAX31865 : ID 3328 : $14.95 : Adafruit Industries, Unique & fun DIY electronics and kits
alesam:
Use a PT-100 sensor . It widely available. For example - https://www.amazon.com/RTD-Pt100-Temperature-Control-Thermocouple/dp/B00VQ09018Then you need an amplifier. I'd recommend this one - Adafruit PT100 RTD Temperature Sensor Amplifier - MAX31865 : ID 3328 : $14.95 : Adafruit Industries, Unique & fun DIY electronics and kits
Hello and thank you for the reply.
Is there a reason that you recommended a pt-100 over a k-type probe? What is the difference between the two?
For this one I need to be fairly accurate if at all possible.
PT100 is more accurate than k thermocouple. Main adadvantage of K probe - it can work at higher temp (up to 1350C) but it's not important for your case.
would a pt1000 instead of a pt100 be better suited for this?
EDIT:
The main difference is
pt100 == Wire-wound resistors 1.0 degree accuracy more durable, use more electricity, not as accurate at higher temps
pt1000 == Thin-film resistors 0.1 degree accuracy more fragile, less electricity, more accurate above 500f
EverydayDiesel:
would a pt1000 instead of a pt100 be better suited for this?EDIT:
The main difference is
pt100 == Wire-wound resistors 1.0 degree accuracy more durable, use more electricity, not as accurate at higher tempspt1000 == Thin-film resistors 0.1 degree accuracy more fragile, less electricity, more accurate above 500f
From your stated requirements I would think the PT100 is the better choice. I doubt you need 0.1 degree accuracy in a fryer, durable is good and you don't care about sensor electricity consumption if you're already heating oil with it.
Hello, I wound up getting this:
sensor: https://www.amazon.com/gp/product/B07DP3LYPX/
amp: https://www.amazon.com/gp/product/B01N4LEVZN
The example on Pinouts | Adafruit MAX31865 RTD PT100 or PT1000 Amplifier | Adafruit Learning System has a probe with 2 + and 1 - wire but mine has 1+/2-.
The website says:
For 3-wire usage. Solder closed the jumper labeled 2/3 Wire and cut the wire connecting the left side of the 2-way jumper right above Rref. Then solder closed the right side labeled 3
3-Wire Sensors
Connect the three wires to the three right-most contacts. Use a multimeter to determine which wires connect together directly (2 ohms or so between them) and which connect through the RTD. Chances are the wires that connect together are the same color. The two wires that are connected together should go in the right-most blocks (labeled F+ and RTD+). It doesn't matter which of the matched pair is on the outside or inside. The third wire that is on the other side of the RTD connects to the left (marked F- or RTD-). It doesn't matter which slot it's in!You will have to cut the thin trace in between the 2-way jumper on the right side of the board, and then solder closed the blob on the right side.
Then next to the terminal block on the left, solder closed that jumper as well. Alternatively you can put a piece of wire into the terminal blocks to 'short' them
The confusion is based on their instructions they want me to jump "2/3" but in their example they have a wire with 2+ / 1-
Since my sensor is the opposite 2- / 1+ then I am thinking I need to
- Soldier/jump the "2 wire"
- Leave "2/3 wire" alone
- Solder/jump right side of "3"
Or
I am not sure how exactly an rtd works (similar to a resistor?) so polarity might not matter.
I could reverse the polarity so that it is just like adafruits example.
PT100 has no + or -. It's just a resisresistor. Color coding just shows two wires conneconnected to one side of that resitor.