SRM for TBN

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My SRM for ASTM D4739 is NIST 1848 Lubricating oil additive. It's certified value for TBN is 44~55.2. But my results show negative values.
Other samples results are minus as well.
I use Mettler Toledo Autotitrator.

Why do I get negative values on TBN?

Is there any other SRM available for ASTM D4739 not D2896? Please recommend one.

Thanks,
Viv

9/14/067:27 AM

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Original Post

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etMember

What is the unit of the TBN?

9/19/069:14 AM

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newbMember

TBN is measured in mg KOH/g. However, I'd like to know if it is the only SRM for TBN. Is there any others? I'm also looking to check my titrator performance.

10/6/063:14 AM

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mariaMember

You don't say if this problems is just for this range of testing.
We had a simmilar situation when we started to use a new titrator (replacement) as you know the equipment reads millivolts. What happened, whe inverted the inputs in the rear part of titrator. May be this help.

10/28/0611:11 AM

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