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A word about our sensors ...

Being a retired engineer and having worked with many types of sensor and control systems I regret to say when I started making cheese I made the mistake of assuming the "low cost" consumer sensors were "reasonably" accurate. They are, but like anything else you get what you pay for, and it pays to "trust but verify" your sensors.


Temperature

All of our temperature sensors use NTC thermistors that are accurate and inexpensive.

Thermistors have a somewhat limited temperature range (maximum of 200C) that is lower than RTD's and thermocouples, so you don't want to use them for measuring how hot your grill is. But the range is well suited for cheese, beer and wine making (for cooling), heating milk for cheese and yogurt making, and Sous Vide water bath cooking. Aside from their low cost, the big advantage of thermistors is that you can have longer sensor wire leads without affecting accuracy. We stock all of our sensors with 8 ft. minimum leads (cable) and longer cables are available.


Humidity

For humidity we use two different types. The Control Cube RH uses a HS1101LF capacitive sensor that are interchangable, very accurate (+/- 2% RH) and measure through the full %RH range. Our Willhi WH8040 controller is also temperature compensated with a remote temperature sensor which further increases accuracy.


Our Humidity / Temperature Monitor use a HR202 resistive device that is less accurate (+ / 5% RH) but are economical and interchangeable allowing the sensors to be replaced at low cost without re-calibration. Many "low cost" humidity monitors and even some control systems use the HR202, but we think the HS1101LF is worth the extra cost for precise control.


If you want more information this is a good article and has a good explanation of "what is humidity" at the end.  

Cheese Tip

What's in your cave?

Aside from cheese, that is. The cheese aging environment with it's high humidity and dew point not to mentions various mold spores and bacteria floating around can be tough on humidity sensors and cause long term drift. If you suspect a sensor is not reading correctly the best thing is to do a calibration test using a saturated salt solution. That will help you determine if the sensor needs replacing (this is why we offer low-cost replaceable sensor heads for all of our humidity control / monitor products).What's in your cave?

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