processing technology 37
Fig. 3. A CPS disc centrifuge for measuring particle sizes down to 5nm.
transducers enabling the pore size range to be extended
Fig. 2. Electroformed pores in a porometer calibration down to 14 nanometres and up to 300 micrometres
disc. (Fig. 1).
The question of interlaboratory comparisons has been
In the critical application in the pharmaceutical addressed by collaborative research between Tecan
2
and
industry, uncertainty in pore size measurement of filters Whitehouse Scientific
3
who have produced and certified
can be fatal. precision pores in metal foils.
The first three porometer calibration discs have
Addressing uncertainties
diameters of 25 mm and pores of 3, 5 and 10 microns
This year has seen significant advances in the design with deviations of less than 0.5 microns (Fig. 2).
of porometers. The latest instrument from Benelux Initial comparisons with electron microscopy have
Scientific
1
introduced at the Filtration Society’s seminar been very encouraging. This new standard will at last
incorporates state of the art flow meters and pressure enable direct comparisons to be made between all models
➠
humidity transmitter offers improved connectivity
v
aisala humicap humidity and When the trigger limits are exceeded, a
temperature transmitter series real-time alarm appears on the display.
hmt330 has been upgraded with lan and the series hmt330 consists of six
Wlan communication options and a display models: hmt331 for wall mounting;
alarm. hmt333 for duct mounting and tight
With the new ethernet communication spaces; hmt334 for high pressures up to
options you can connect the transmitter 100bar and vacuum conditions; hmt335
into a computer network providing a for high temperatures; hmt337 for high
virtual terminal connection between the humidity and meteorological applications;
transmitter and a pc. communication is hmt338 for pressurised pipelines up to
then possible using for example telnet 40bar.
software. fteatures include: warmed probe
each transmitter is given an ip address,
Fig. 1. The updated transmitter is ideal
for superior performance in condensing
making it a uniquely addressed device in
for applications that do not allow
environments; shows measurement
the network.
holes through walls and ceilings or the
trends and one-year history graphically;
the lan and Wlan options make it
installation of new cables.
corrosion resistant ip65 housing; nist
easy to add a new humidity transmitter traceable (certificate included); integrated
to an existing ethernet network. also, a standard feature in vaisala humidity data logging, with more than four years of
applications that do not allow holes transmitters equipped with a built-in measured history. u
through walls and ceilings, or the display.
enter 37 or ✔ at www.scientistlive.com/elab
installation of new cables, benefit from this With this function the user can set
solution. alarm trigger limits for two distinct Vaisala Oyj is based in Helsinki, Finland.
a new display alarm function is now measured quantities. www.vaisala.com
www.scientistlive.com
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