Gas pressure and temperature measuring system GTM Method of ...

GTM
Gas pressure and temperature
measuring system
■ Measurement of gas pressure and temperature during
the grinding process
■ Radio transmission of data to a receiver remote from the mill
ZERKLEINERN PARTIKELMESSEN TEILEN MILLING PARTICLE SIZING DIVIDING ZERKLEINERN PARTIKELMESSEN TEILEN MILLING PARTICLE SIZING DIVIDING ZERKLEINERN PARTIKELMESSEN TEILEN
Made in Germany

Gas pressure and temperature
measuring system GTM
Field of application
The system can be used wherever batch quantities need to be
ground in a totally enclosed container. It is available as standard
for the „pulverisette 4“, „pulverisette 5“ and „pulverisette 6“. It
transmits directly from the grinding bowl lid without the mill
having to be adapted.
The GTM system is suitable for investigations in the area of
mechanical alloying for the preparation of new amorphous and
nano-crystalline materials. Furthermore it allows grinding
processes for industrial use to be monitored and optimised.
By measuring the grinding container temperature, an „integral“
figure for the process value of temperature is possible, reflecting
the effects of friction, impact and conversion processes. Abrupt
and minute changes in reaction are recorded by the continual and
highly sensitive measurement of the gas pressure within the grinding
container.
The measured gas pressure describes amongst other things the
interaction of the gas with the surfaces created during the
grinding process (absorption and desorption of gases). Extremely
rapid phase formation can, for the first time, be observed
„IN SITU“ as an adiabatic process (no heat exchange with the
system).
The influence of the grinding parameters - revolutions,
ball-grinding/material ratio and grinding duration - can, for the
first time, be carried out without time-consuming and costly
„abortive attempts“. As a result of the exact measuring and
recording of reaction times, for example, specific addition of
reaction materials can be used to prepare new materials or
combinations of materials to produce powder mixtures with
particular mechano-chemical properties.
Method of operation
The gas pressure and temperature measuring system (GTM),
was developed in co-operation with the Fraunhofer Institute
for Applied Material Research in Dresden, and enables process
values to be measured during the grinding process. A
radio transmitter located in the lid of the grinding bowl sends
data from the grinding bowl to a receiver, which is connected to
a computer. The corresponding WINDOWS programme presents
the results in the form of tables and graphics.
Technical data
System requirements Standard WINDOWS PC
with at least 8 Mbyte RAM
Right to modify technical
specifications reserved
Design Characteristics
■ UHF-radio transmitter, 10 mW, free of admission and charge
■ Up to four transmitter componentries can operate simultaneous
in the mill
■ Measuring range for single and dual transmission operation
with up to 200 measurements
■ Pressure measurement range: 0...700 kPa
■ Temperature measuring range: 0-70°C
■ Resolution pressure signal: 0.175 kPa
■ Resolution temperature signal: 0.025 K
■ Permissible transient (-2 s) heat of reaction 30 kJ
■ Measurement value recording-resolution 1ms
■ Receiver componentry is also charging station for rechargeable
batteries of the transmitter componentry
■ RS232 connection to computer
■ Bowl 250 ml or 500 ml stainless steel
Advantages
■ Can be used with „pulverisette 4“, „pulverisette 5“ or
„pulverisette 6“ without modification
■ Evaluation of data by WINDOWS programme
■ Indoor range of up to 30 metres
■ Operating time with fully charged battery approx. 50 hours
■ Alignment of the measuring rate to the signal dynamic for
enhanced battery life: Sleep-mode of the transmitter componentry
when measuring signals remain the same
Ordering data
Planetary Mill
“pulverisette 5 ” with GTM-System
Order no. Description For rapid
fax-quotation
tick here!
Gas pressure and temperature
measuring system (GTM)
50.2510.00 incl. 250 ml grinding bowl made of stainless
steel with special lid, transmitter and
separate receiver
50.2540.00 incl. 500 ml grinding bowl made of stainless
steel with special lid, transmitter and
separate receiver
If further grinding bowls and transmitters are needed, please ask for the
respective order numbers.
See separate brochures for ordering information on Vario-Planetary Mill
“pulverisette 4”, Planetary Mill “pulverisette 5” and Planetary Mono Mill
“pulverisette 6”.
FRITSCH GmbH · Industriestrasse 8 · D-55743 Idar-Oberstein
Phone: (0)67 84/70-0 · Telefax: (0)67 84/70-11 · E-Mail: info@ fritsch.de ·Internet: http://www.fritsch.de
gtme-04-01-5/P