The electrodes
are fabricated from a high nickel furnace grade stainless
steel alloy selected for resistance to oxidation at elevated
temperatures. The cell is a three terminal type, with
an air spaced, grounded guard ring surrounding the fixed
electrode in the same vertical plane. The moving electrode
is spring loaded to maintain sample contact, and it is
isolated from ground with a refractory material.
The standard
electrodes are plane and parallel to within 0.001" and
have a 2.125" diameter with a 1.75" sensing face, though
other sizes can be custom fabricated.
The VIP-270
has several features to help the researcher. A simple
tire chuck with compressed air can be used to purge
contaminants from the space between the guard ring and
fixed electrode. With reasonable care, the entire cell
can be disassembled for cleaning and maintenance. The
mounted sample thickness can be measured indirectly
with a 2" micrometer or a caliper. Air gap dielectric
values can be measured by inserting resistive shims,
or the sample itself, behind the adjustable banana receptacle.
These cells
are superbly crafted and can be delivered within 8 weeks of the purchase
order receipt. We welcome the opportunity to discuss your specific
measurement needs.
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