ADT7420 test procedure

Document created by analog-archivist Employee on Feb 23, 2016Last modified by MH@CAC on Feb 25, 2016
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Q

Our customer produces heat probes using ADT7420UCPZ. We gave the information
that these sensors have 0.2C sensitivity and don't need calibration. To use
this sensor in their calorimeter design, our local regulations require
below information.

 

1. Some test report examples from manufacturer of sensors that will deliver to
you from him with your orders

 

2. Maximum admissible working pressure for direct mounted sensors (PS in bar)

 

3. Principle of operation (how to detect tempereture and convert digital)

 

Can we also have detailed test reports about the resolution is 0.2C. How do you
measure the 0.2C accuracy. How ADI guarantees this accuracy.

 

Also I need a sample test report for ADT7420

 

A

ADI do not characterize what would be the maximum working pressure the part
could be exposed to, however when testing for reliability there are a couple of
tests done under 2atm... So, you would need to validate yourself whether this
part would be suitable in such environment or not. As far as I know, ceramic
parts would support higher pressure levels, but they use to be much more
expensive, and our +-0.2C is not available on such packages either, so this
won't be a solution here.

 

The test procedure, basically, consist on that parts are tested firstly, under
temperature forced system, measurements are taking for the reference at 25C and
85C. Then, parts goes into an oil bath. In an oil bath, temperature can be
precisely controlled and it is very stable, so measurements are comparable to
such an accurate reference. Instruments used (Superthermometer and SPRT probes)
in there for getting those references are NIST traceable and they are
calibrated accordingly. So, as the measurements are comparable to those
calibrated instruments, that ensure our sensor are within that accuracy stated
on the datasheet.

 

Please find attached a couple of documents we use to provide to customers, and
I hope that will be ok for your local regulations.

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