Calibration Frequency - Evidential Breath Analizer

T

Tungsten

#11
Re: Calibration Frequency

Something that could be questioned is the number of times a gage is utilized between calibrations. I have extend calibration intervals for those gages that only see occasional use where those that see continual use are calibrated more often. It becomes more of a count for the number of uses vs. a time period, for my use, a bit more accurate for maintaining calibration of a precision gage.
This IS exactly what I was thinking. The number of time the device was used in between calibrations. For a breath analyzer it should NOT be more than a thousand times. Frankly, in Ireland, this can be more. Far more.:tg: Thanks very much for your input!:applause:
 
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bobdoering

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#12
Re: Calibration Frequency

This IS exactly what I was thinking. The number of time the device was used in between calibrations. For a breath analyzer it should NOT be more than a thousand times. Frankly, in Ireland, this can be more. Far more.:tg: Thanks very much for your input!:applause:
Yes, but again, that is just a manner of developing calibration intervals. It it was used a bazillion times between calibrations - or just once -and both calibrations passed, it is still all good.
 
T

Tungsten

#13
Re: Calibration Frequency

Yes, but again, that is just a manner of developing calibration intervals. It it was used a bazillion times between calibrations - or just once -and both calibrations passed, it is still all good.
I think if there is a solid trend in using the instrument significantly MORE times than the recommended, but the cal intervals (6 mos) were NOT tightened, I'd definitely question accuracy. Don't you think?:(
 
T

Tungsten

#14
Re: Calibration Frequency

Yes, but again, that is just a manner of developing calibration intervals. It it was used a bazillion times between calibrations - or just once -and both calibrations passed, it is still all good.
Yes and no. There is a specific guide for EBS' that the unit can not be used MORE than a thousand times in between calibrations. Again, this is all legality vs. practicality. (Unfortunately) I don't have much room for science to support the case. All I can grab into is LEGALITY. :thanks: for your input!
 

bobdoering

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#15
Re: Calibration Frequency

I think if there is a solid trend in using the instrument significantly MORE times than the recommended, but the cal intervals (6 mos) were NOT tightened, I'd definitely question accuracy. Don't you think?:(
You can always question it - but there really is nothing to support a problem existed by exceeding "recommendations" if the device passed the calibration each time. It's not quite the same thing as conceptually as running your car 20,000 miles between oil changes.
 
T

Tungsten

#17
Re: Calibration Frequency

You can always question it - but there really is nothing to support a problem existed by exceeding "recommendations" if the device passed the calibration each time. It's not quite the same thing as conceptually as running your car 20,000 miles between oil changes.
True, and you're right! However there is one other thing. The manual of the LION Intoxilizer 6000IRL states that the machine produces an "ambient fail" reading if unable to conduct a test due to temperature, but this did not happened. Question: if the unit set to produce acceptable readings and print between 15 and 35 degrees C, how come it STILL printed a result at 14.5? :confused: Thanks for your inputs.:agree:
 

Jim Wynne

Staff member
Admin
#18
Re: Calibration Frequency

Hi, and thanks very much for your reply. So, otherwords if I stopped by the cops on 19th and they took a breath test with a device which was due for calibration on the 12th of the same month, there is no, or little argument from the point of legality?
You're in Ireland, so I have no idea what the laws might be. In the US, assuming evidence is admissible to begin with, the idea is to convince a jury that the calibration status of a device used in a particular instance is questionable--reasonable doubt.
 

bobdoering

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#19
Re: Calibration Frequency

True, and you're right! However there is one other thing. The manual of the LION Intoxilizer 6000IRL states that the machine produces an "ambient fail" reading if unable to conduct a test due to temperature, but this did not happened. Question: if the unit set to produce acceptable readings and print between 15 and 35 degrees C, how come it STILL printed a result at 14.5? :confused: Thanks for your inputs.:agree:
Now THAT is a valid question!
 

BradM

Staff member
Admin
#20
Re: Calibration Frequency

Calibration is simply verifying the instrument is operating like it is intended. So either the instrument has been working like it should, or not.

The instrument has a tolerance, and there is error with testing methods. That tolerance and error may/ may not be a factor in testing.

Say.. you are testing Blood Alcohol content, and it's important if the actual BAC is .08 or .1. If the instrument is only accurate to within .05, say, then you may have a case. If it is accurate to like .01 or better, I don't think you would get too far with that.

Now, if this instruments has a "calibration" program that must be ran prior to each use, that is different.

I would think you would be interested in determining the repeatability of the instrument. How reliable is this thing?

Bottom line: This instrument is suitable to be making the claims during testing, or it is not. Your burden is to prove in court that the instrument is/ was not suitable.
 
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