siunitx fette griech Buchstaben

[mermaid]

Bei der Verwendung griech. Buchstaben werden diese bei mir fett dargestellt, obwohl dies nicht gewünscht ist und der rest "normal" dargestellt wird. Gibt es dafür eine eigene Einstellung, die ich im sisetup hinterlegen muss?
Anbei mal mein Code (Anmerkung: sisetup wird verwendet, da die vorgegebenen Schriften die Darstellung sonst komplett fett macht ...)

\documentclass[oneside]{tudbook}
\usepackage{tudthesis, german}
\usepackage{setspace}
\hyphenation{
Bei-spiel
}
\usepackage{enumitem}
\usepackage[intoc, german]{nomencl}
\makenomenclature
\usepackage[printonlyused]{acronym}
\newcommand{\acrounit}[1]{
\acroextra{\makebox[18mm][l]{\si[per=frac,fraction=nice]{#1}}}
}
\usepackage{graphicx}
\graphicspath{{bilder/}}
\usepackage[small,bf,hang]{caption}
\usepackage{float}
\newfloat{Diagramm}{hbt}{lod}[chapter]
\usepackage{subfig}
\usepackage{picins}
\usepackage{pdfpages}
\usepackage{color}
\usepackage{siunitx}
\sisetup{detect-inline-weight=text,detect-family=true,math-rm=\mathsf,text-rm=\sffamily, mode=math}

\usepackage{url}
\usepackage{textcomp}
\usepackage{array}
\newcolumntype{C}[1]{>{\centering\arraybackslash}m{#1}}
\usepackage{siunitx}

\begin{document}
\SI[mode=math]{1.99}{\micro\meter\per\kilogram} \\
\SI[mode=text]{1.99}{\micro\meter\per\kilogram} \\
\end{document}

bei mode=math ist leider das mü fett -> nicht gewollt
bei mode=text ist alles fett (zum vgl. von mü)

[hakaze]

Mit der Vorlage für tudbook und tudthesis von dieser Seite (http://tu-dresden.de/service/publizieren/cd/4_latex) kann ich dein Problem nicht reproduzieren. Ist deine LaTeX-Installation aktuell?

Hier mein Auszug von \listfiles:

*File List*
tudbook.cls 2012/08/04 Buch-Klasse fuer die TU Dresden, (c) by Klaus Bergma
nn
book.cls 2007/10/19 v1.4h Standard LaTeX document class
bk10.clo 2007/10/19 v1.4h Standard LaTeX file (size option)
graphicx.sty 1999/02/16 v1.0f Enhanced LaTeX Graphics (DPC,SPQR)
keyval.sty 1999/03/16 v1.13 key=value parser (DPC)
graphics.sty 2009/02/05 v1.0o Standard LaTeX Graphics (DPC,SPQR)
trig.sty 1999/03/16 v1.09 sin cos tan (DPC)
graphics.cfg 2010/04/23 v1.9 graphics configuration of TeX Live
pdftex.def 2011/05/27 v0.06d Graphics/color for pdfTeX
infwarerr.sty 2010/04/08 v1.3 Providing info/warning/error messages (HO)
ltxcmds.sty 2011/11/09 v1.22 LaTeX kernel commands for general use (HO)
ifthen.sty 2001/05/26 v1.1c Standard LaTeX ifthen package (DPC)
fontenc.sty
t1enc.def 2005/09/27 v1.99g Standard LaTeX file
TU_Logo_SW.pdf Graphic file (type pdf)
babel.sty 2008/07/08 v3.8m The Babel package
english.ldf 2005/03/30 v3.3o English support from the babel system
ngermanb.ldf 2008/07/06 v2.6n new German support from the babel system
tudthesis.sty 2011/05/02 Thesis-Package fuer die TU Dresden, (c) by Klaus Be
rgmann
setspace.sty 2011/12/19 v6.7a set line spacing
enumitem.sty 2011/09/28 v3.5.2 Customized lists
nomencl.sty 2005/09/22 v4.2 Nomenclature package (LN)
acronym.sty 2012/10/29 v1.38 Support for acronyms (Tobias Oetiker)
suffix.sty 2006/07/15 1.5 Variant command support
xstring.sty 2013/1/13 v1.7 String manipulations (C Tellechea)
caption.sty 2013/01/06 v3.3 Customizing captions (AR)
caption3.sty 2013/01/06 v1.5 caption3 kernel (AR)
float.sty 2001/11/08 v1.3d Float enhancements (AL)
subfig.sty 2005/06/28 ver: 1.3 subfig package
pdfpages.sty 2012/08/31 v0.4t Insert pages of external PDF documents (AM)
calc.sty 2007/08/22 v4.3 Infix arithmetic (KKT,FJ)
eso-pic.sty 2010/10/06 v2.0c eso-pic (RN)
atbegshi.sty 2011/10/05 v1.16 At begin shipout hook (HO)
ifpdf.sty 2011/01/30 v2.3 Provides the ifpdf switch (HO)
xcolor.sty 2007/01/21 v2.11 LaTeX color extensions (UK)
color.cfg 2007/01/18 v1.5 color configuration of teTeX/TeXLive
pppdftex.def 2012/08/31 v0.4t Pdfpages driver for pdfTeX (AM)
siunitx.sty 2013/01/09 v2.5o A comprehensive (SI) units package
expl3.sty 2012/12/21 v4390 L3 Experimental code bundle wrapper
l3names.sty 2012/12/07 v4346 L3 Namespace for primitives
l3bootstrap.sty 2012/07/16 v3991 L3 Experimental bootstrap code
etex.sty 1998/03/26 v2.0 eTeX basic definition package (PEB)
l3basics.sty 2012/11/24 v4339 L3 Basic definitions
l3expan.sty 2012/08/28 v4149 L3 Argument expansion
l3tl.sty 2012/11/24 v4339 L3 Token lists
l3seq.sty 2012/11/24 v4339 L3 Sequences and stacks
l3int.sty 2012/09/26 v4237 L3 Integers
l3quark.sty 2012/11/04 v4268 L3 Quarks
l3prg.sty 2012/11/24 v4339 L3 Control structures
l3clist.sty 2012/11/24 v4339 L3 Comma separated lists
l3token.sty 2012/12/20 v4384 L3 Experimental token manipulation
l3prop.sty 2012/09/09 v4212 L3 Property lists
l3msg.sty 2012/09/09 v4212 L3 Messages
l3file.sty 2012/12/20 v4377 L3 File and I/O operations
l3skip.sty 2012/11/04 v4260 L3 Dimensions and skips
l3keys.sty 2012/11/02 v4256 L3 Experimental key-value interfaces
l3fp.sty 2012/11/10 v4305 L3 Floating points
l3box.sty 2012/12/08 v4347 L3 Experimental boxes
l3coffins.sty 2012/09/09 v4212 L3 Coffin code layer
l3color.sty 2012/08/29 v4156 L3 Experimental color support
l3luatex.sty 2012/08/03 v4049 L3 Experimental LuaTeX-specific functions
l3candidates.sty 2012/12/20 v4383 L3 Experimental additions to l3kernel
xparse.sty 2012/12/21 v4390 L3 Experimental document command parser
amstext.sty 2000/06/29 v2.01
amsgen.sty 1999/11/30 v2.0
array.sty 2008/09/09 v2.4c Tabular extension package (FMi)
l3keys2e.sty 2012/12/21 v4390 LaTeX2e option processing using LaTeX3 keys
translator.sty 2010/06/12 ver 1.10
translator-language-mappings.tex
url.sty 2006/04/12 ver 3.3 Verb mode for urls, etc.
textcomp.sty 2005/09/27 v1.99g Standard LaTeX package
ts1enc.def 2001/06/05 v3.0e (jk/car/fm) Standard LaTeX file
ts1cmr.fd 1999/05/25 v2.5h Standard LaTeX font definitions
supp-pdf.mkii
pdftexcmds.sty 2011/11/29 v0.20 Utility functions of pdfTeX for LuaTeX (HO)
ifluatex.sty 2010/03/01 v1.3 Provides the ifluatex switch (HO)
epstopdf-base.sty 2010/02/09 v2.5 Base part for package epstopdf
grfext.sty 2010/08/19 v1.1 Manage graphics extensions (HO)
kvdefinekeys.sty 2011/04/07 v1.3 Define keys (HO)
kvoptions.sty 2011/06/30 v3.11 Key value format for package options (HO)
kvsetkeys.sty 2012/04/25 v1.16 Key value parser (HO)
etexcmds.sty 2011/02/16 v1.5 Avoid name clashes with e-TeX commands (HO)
epstopdf-sys.cfg 2010/07/13 v1.3 Configuration of (r)epstopdf for TeX Live
translator-basic-dictionary-English.dict
siunitx-abbreviations.cfg 2013/01/09 v2.5o siunitx: Abbreviated units
***********

PS. das Paket german ist obsolet, besser \usepackage[ngerman]{babel} verwenden!