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File Name: HTCA_003-DADS-UserManual.docx
Document Type: End User Manual | Version date: 01/05/2010 | Last Printed: 15/02/2011
Page 12/81
TLS Modes
The absorption value of the ASTM Procedure A method is determined by using the TLS
(Torque limit switch). The TLS itself is also determined by a standard test method. For every
carbon black type a target value has been fixed. The torque value at this target value gives
the TLS. This mode is called the
target value mode
. It is now common practice for the
5
series of the
Standard Reference Blacks
.
Refer to ASTM Standards for more information on this topic.
A new method has been introduced by
to determine the TLS value. In
the
70 % mode
, the TLS is fixed as 70% from the maximum torque value developed during
the TLS measurement. Like in the ASTM method the final TLS is the average of the two last
TLS measurements. This method will probably become valid for the
6
series of the
Standard
Reference Blacks
.
For other products like Silica, where no standard is exists yet, it's not possible to determine
the TLS by the ASTM method, as the torque values are too low. For this reason HITEC
introduced the possibility to manually set the TLS. In the
manual mode
the operator has the
possibility to set the TLS value manually. No TLS measurements are done.
The TLS mode is always linked to a
chamber
. This is done in the HITEC Config application
Normalization Measurement
Hereafter an extract of the ASTM norm D2414 is given.
Figure 2
– ASTM for Standard Reference Blacks
