11 jul. 2017

Dror Sharon: This Tiny Molecular Sensor can Identify a Viagra Pill | WIR...


I am a reader of the Wired Magazine, and is nice to see how NIR technology is becoming a part of this digitalized world, so it will be amazing what this technology can bring to the future.

3 jul. 2017

Lid Adjustment - NIRS™ DS2500


The firsts DS2500 (Generation 1) don´t have this system to adjust the gap for the door, and the way to do it is more dificult. If your instrument does not have the 2 screws to remove the cover showed in the video is becouse is a "Generation 1" instrument .
The instrument showed in the video is a "Generation 2".

Considerig and check subsample variation

When analyzing a heterogeneous sample, several subsamples for a large cup are acquired, and finally an average result from all the subsamples is showed as result. Is to the average result to which we give normally importance and we compared to the lab value to know the accuracy of our measurement. Anyway is important to see the several and individual results for the different subsamples.

One reason for this is to check how homogeneous is our sample, looking to the standard deviation of the predictions for each of the constituents. But we can check that depending of the math treatment we have apply in the equation, the standard deviation of the subsample predictions change and in some cases became quite large. This is something we have to consider to make a robust calibration.
 
Remember always to look to the subsample spectra and get conclusions comparing the spectral RMS with the SD for the different subsamples.

22 jun. 2017

How to check the cooling liquid - NIRS™ DS2500


Filter Replacement - NIRS™ DS2500


Lamp Replacement - NIRS™ DS2500


Instrument Calibration - NIRS™ DS2500


Checking Temperatures in DS2500 (Lamp)



 
In order that the performance of the instrument DS2500 be optimal, we have to attend the temperature of the lamp when running the diagnostics. I consider it is fine around 35ºC.
Sometimes we find high temperatures like the one in the picture, and even seeing that the report says that is OK, this temperature can affect to the instrument itself and the results.
One of the causes that this temperature increase is that the tank of the pump has lost water, so it is a good idea to check the level, and fill it in if necessary.

Checking pump level video
Check that the pump is pumping. We should see some turbulences in the water and a small noise in the pump.
Check if the water is to dirty, or with algae’s.
Check that the fan is working, its mission is to keep cold the water and see if the filter is clean so the fan performs better its mission.

Changing the filter

It is important also the temperature of the room or laboratory where the instrument is. A higher temperature will increase also the lamp temperature.

After checking all this points, and being sure that the lamp is fine, maybe is the moment to run an instrument calibration:

Instrument Calibration

 

19 jun. 2017

Comparing Residuals, GH and T when validating


When looking to the validation statistics is important to look at the same time to three values: Residual, GH and T value for every sample. From this data (fiber), we can check if our sample is extrapolating badly, it is not robust or any other issues.

In this case, as we can see there are samples with a very high GH and we can see that those samples have in common that the T statistic is negative (in the left tail of the Gaussian Bell) and the value is quite high also for the T.
These samples have also the highest residiual values.
 Something is telling us that this samples have something special and are not well represented by the equation. PCA is warking fine and is detecting these samples as outliers, but we need to know what makes tese samples special.

These samples are soy meal and have  highest fat value as the ones in the calibration so the Model did not learn enough about the interaction between the fiber bands and fat bands. So this samples are very interested to make the calibtration more robust.

After checking this, we can add these samples to the calibration to improve the results of the next validation.

 
Graphically in Excel we can se the interaction between the Residuals, GHs and T values:
 

22 may. 2017

Mosaic 7.12 is now available on our Europe server


Mosaic version 7.12 is now available on our Europe server.
Once you try to connect, you should be asked to automatically download and install the new client.
User accounts, passwords remain the same.

Ports used for NOVA:
 
Configure correctly the ports with your IT for a successful synchonization.