I’ve had a multi sensor in my fridge working just fine for 6+ months that hovers around 40. Not sure how I feel about using it for a freezer though others have said it works.
Personally for a freezer I’d get something like a Adafruit DS18B20 temperature sensor + a ESP8266 running ST_Anything. The sensor is rated for -67* F to +257* F and is waterproof so if you already have a way to route it into the freezer I’d think it’s the best way to go.
I don’t know of a actual Zigbee or Z-Wave sensor that’s made for freezers simply because of battery life being sketchy.
People often use a similar probe sensor with the Fibaro RGBW controller, which can connect to dumb sensors.
You can also connect a temperature probe to one of the Fibaro open/close sensors, which I know sounds strange, but again works and quite a few people are using it. However, that’s a battery operated option and if you are using this for remote monitoring you might prefer one of the mains powered choices.
And Qubino also offers their own $50 zwave thermostat micro complete with probe
That said, you’re really going to be pushing it with the concrete wall at 30 m. It’s just going to depend on how much the concrete obstructs signal (which is typically a lot).
Is this all I will need to montor the door on the freezer ( just going to put it on the outside, not worried about intrution, just want notification when it’s open ) and then to watch the tempature and get notification if it drops to certain level ?
I know I linked 2 different sites, I’m going to have to order this from UK ( at least the devices but this vesternet site only had 1m of this DS18B20 and only -10°C ) … so either I get the sensor from amazon or I find another site that has this all
I’ve done this exact setup. The only problem I seem to be having is the sensor says my pond is 9.4c, but my pond thermometer says the pond is around 14c. This is too much of a difference. Can anything be done to get a more accurate temperature reading?
Found this thread whilst googling, thought I would post a couple of things I found just in case it helps anyone out:
[ External temperature probe detects temperature from -30°C to 100°C] https://www.climax.com.tw/new/tso-9-el-zb.php