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Homemade sous-vide slow cooker conversion kit: Difference between revisions
Homemade sous-vide slow cooker conversion kit (view source)
Revision as of 09:46, 8 February 2015
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* Update 2 | * Update 2 | ||
: The thermocouple supplied with the Amazon controller is unsuitable as it is not waterproof. The screening is stainless steel braiding covering heat-resistant braid (''fibreglass?''). Neither materials are the least bit waterproof and water ingress to the thermocouple would be immediate. | : The thermocouple supplied with the Amazon controller is unsuitable as it is not waterproof. The screening is stainless steel braiding covering heat-resistant braid (''fibreglass?''). Neither materials are the least bit waterproof and water ingress to the thermocouple would be immediate. | ||
: A waterproof thermocouple is available from Amazon for under £4: ( [http://www.amazon.co.uk/Probe-Thermocouple-Temperature-Measurement-Sensor/dp/B008MU0Q2M/ref=pd_sim_sbs_diy_10?ie=UTF8&refRID=0H79PXW5WSGF4PZV6ECX K Type 20cm Probe Thermocouple Temperature Measurement Sensor 0.63M Amazon uk]). | : A waterproof thermocouple is available from Amazon for under £4: ( [http://www.amazon.co.uk/Probe-Thermocouple-Temperature-Measurement-Sensor/dp/B008MU0Q2M/ref=pd_sim_sbs_diy_10?ie=UTF8&refRID=0H79PXW5WSGF4PZV6ECX K Type 20cm Probe Thermocouple Temperature Measurement Sensor 0.63M Amazon uk]). Seems to be innacurate and requires recalibrating every time the unit is used. I notice afterwards that it is sold with a temperature range of -100°C to 1250°C so it's probably not going to be accurate to a few degrees. | ||
* Update 3 | * Update 3 | ||
: I've assembled a prototype which appears works in theory, but the manual provided is absolutely hopeless and it was starting to look as though it would be impossible to set the PID controller from the information at hand. I | : I've assembled a prototype which appears works in theory, but the manual provided is absolutely hopeless and it was starting to look as though it would be impossible to set the PID controller from the information at hand. After much experimenting, I managed to get it working. See below. | ||
===Setup and testing=== | ===Setup and testing=== | ||
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As far as I can acertain, providing KEY <code>run</code> is set to 1 (automatic) the PID will automatically switch the solid state relay output on and off to allow temperature regulation of the heating device; a slow cooker in my case. | As far as I can acertain, providing KEY <code>run</code> is set to 1 (automatic) the PID will automatically switch the solid state relay output on and off to allow temperature regulation of the heating device; a slow cooker in my case. | ||
===Choosing the correct thermocouple=== | |||
The thermocouple that came with the PID unit was unsuitable as it was not waterproof and my chosen replacement was wildly inaccurate, probably because its operating range was so large (-100°C to 1250°C Probe 1M). Now to find a more accurate waterproof thermocouple. | |||
===Useful resources=== | ===Useful resources=== | ||
* [[Media:Sestos PIC controller manual.pdf|Sestos PID controller manual.pdf]] | * [[Media:Sestos PIC controller manual.pdf|Sestos PID controller manual.pdf]] | ||