Very low temperature (-25C) on ds18b20 precision
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I'm busy building a multi-probe temperature sensor and log system using a couple of ds18b20(here is the datesheet of ds18b20) probes on a Raspberry Pi.
They will be monitoring freezer temperatures that should be between -23°C and -18°C.
I'm a little concerned about the precision of the probes though as the datasheets only give the precision between the -10°C to +85°C Range (±0.5°C).
There's an error curve on page 18 here, and another almost identical one on page 20 here. Both of them however start a 0°C and only go up.
As I'll be operating outside of this range, how/where can I find the expected accuracy?
The freezers that the probes will be monitoring are used for storing human tissue, and I'll need this before I can put forward a tender/proposal. Any Ideas?
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I'm busy building a multi-probe temperature sensor and log system using a couple of ds18b20(here is the datesheet of ds18b20) probes on a Raspberry Pi.
They will be monitoring freezer temperatures that should be between -23°C and -18°C.
I'm a little concerned about the precision of the probes though as the datasheets only give the precision between the -10°C to +85°C Range (±0.5°C).
There's an error curve on page 18 here, and another almost identical one on page 20 here. Both of them however start a 0°C and only go up.
As I'll be operating outside of this range, how/where can I find the expected accuracy?
The freezers that the probes will be monitoring are used for storing human tissue, and I'll need this before I can put forward a tender/proposal. Any Ideas?
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mozobata wrote:
Any Ideas?
Buy a probe that is certified for the temperatures you need to monitor.
It's spam. :) Forum spammer (electronic components)[^]
"These people looked deep within my soul and assigned me a number based on the order in which I joined." - Homer
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It's spam. :) Forum spammer (electronic components)[^]
"These people looked deep within my soul and assigned me a number based on the order in which I joined." - Homer
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No problem - it's easy to miss the site-driving link. :)
"These people looked deep within my soul and assigned me a number based on the order in which I joined." - Homer
