Which temperature sensor for room monitoring

Hardware
1

I need to monitor temperature and humidity in several rooms see there are at least two available sensors that could do that, the PR52-33A and PR49-24A. From the looks of it, the PR52 has an external probe that is taking the readings while I assume the PR49 has an internal sensor within the case that is taking the temperature and humidity readings.

Is the PR49 more suited to general temperature/humidity environmental monitoring such as placing in a room (the scenario I am in)? If the sensor is within the case, is there a significant lag to changes in temperature and humidity or is it fairly responsive? It will not be in a room undergoing rapid temp changes, just changes as outdoor weather changes and AC/Heat turns on.

I also see that the PR49 has a cut out on the case labeled XR. What is that for?

2

The 49 series sensors in the black boxes are no longer recommended for new designs. So the PR52-33A is the sensor we recommend for applications where temperature/humidity monitoring is required. It is more accurate and better designed.

If you have WiFi available at the sensor mounting locations you may also be interested in this device:

It does not require a gateway device as it can publish readings directly to an MQTT Broker.

Please let us know if you have any other questions.

Thank you,
Travis Elliott

3

Thanks for the info Travis. I found that you all have the PR55-45L as well which has a few more data points in addition to the humidity and temperature readings. Besides the cost difference, is there much performance difference between the PR55-45L and the PR52-33A?

I know the PR52-33A is supported within the node-red library as I have already used it there. Is the PR55-45L supported as well?

4

If you are looking for the highest accuracy I would recommend PR52-33A. Its temperature accuracy is +/- 0.2ºC and RH accuracy is +/- 2%. The PR55-45L temperature accuracy is +/- 1ºC and RH accuracy is +/- 3%.

PR55-45L also has a built in heater required for accurate air quality measurements. This built in heater will also skew temperature measurements a bit which makes temperature reading less accurate as well.

5

I assume with the heater there would also be decreased battery life as well?

6

We have not seen a significant decrease in total number of transmissions on fully charged batteries between these devices.