Slow Control data page
Here you can find current data from
the TPC Slow Control System:
>>>>> FLCTPCSCS.dat <<<<<
Status: Currently not operational
The older Slow Control files can be
found here.
My Diploma Thesis(pdf).
Hints for using the data:
·
The file is optimized for
use with Microsoft Excel® in English mode. For this there is an extra tab inserted after
the date and time columns – just add both columns in the free column created by
the extra tab. Thus you get a valid data source for the time-axis.
·
The water content in
ppmV is calculated from the dew/frost point. The dew point
instrument provides an analogue output of 10mV/°C which is currently digitized
with a precision of 5 mV. Because of this the logged dew point may differ by
0.5 °C from the value on the display of the dew point instrument – affecting
the water content in ppmV
·
The dew point
instrument provides an automatic cleaning procedure (AMC), where the mirror is
heated up to app. 20 – 30 °C. A hold signal for this procedure is available at
the device – however it is not yet being read out, so large spikes may occur in
humidity data.
·
The pressure difference
can be measured directly only in the range of
±5 mbar, for this a calculated pressure difference was introduced, which
is calculated from the difference of absolute system and atmospheric pressure
added by an offset of 7.3999 mbar to equalize it to the measured pressure
difference.
·
The absolute accuracy
of flow measurement depends on the used mass flow controller (currently 200
cm³/min or 17 ℓ/min). Being
completely over dimensioned and driven in the very low region of its range, the
17 ℓ/min device shows about 5 ℓ/h even if no flow is present.
Relative accuracy of device is about 0.2 % F.S.
·
The bottle pressure is
monitored in a switched mode, as for two instruments there is only one readout
channel. The switching is done by a relay every 15 seconds. Resulting from
this, single zero values may occur at the start of the program when one channel
was not yet read out.
New by
·
The slow control system
at the Medi-TPC is shut down and prepared for storage. A future readout will
most likely be done via DOOCS.
New by
·
The water content is
now calculated using the measured system pressure – not the standard pressure
of 1013.25 mbar anymore.
New by
·
Slow Control system in
new configuration. New flow controller with
1 ℓ/min.
New by
·
Bottle pressure readout
has been integrated into the slow control system.
New by
·
New MBW Dew Point
Instrument installed.
New by
·
Title line in files is
now preceded by “#” for compatibility with GNUPLOT.
New by
·
Improved accuracy for
oxygen measurement by factor of 10.
New by
·
The dew point
instrument provides an automatic cleaning procedure (AMC), where the mirror is
heated up to app. 20 – 30 °C. A hold signal for this procedure is available at
the device. If hold signal is on, “HOLD” will be printed in a column, and the
last humidity-value, before the hold-signal occurred, will be printed as long
as it remains active.
Oliver Schäfer
phone: 040 8998 3137
Last change: 28.10.2009