Gamry Instruments ParaCell, Operator'S Manual

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AssemblyGeneral Information
8
Assembly
This section of the manual tells you how to assemble the kit ’ s components into a complete ParaCell. The
descriptions are based on a “ standard ” cell configuration consisting of a flat metal sample working electrode, a
flat graphite pad counter, and a single-junction reference electrode in a reference bridge tube. A gas dispersion
line can be added but is not included in the standard cell kit.
Feel free to customize your cell configuration. You are only limited by your imagination, the number and size of
the ports available, and your willingness to drill some holes.
General Information
An assembled cell can be seen in Figure 1. The basic setup makes use of the two end holes and one of the four
available ports. The cell must be assembled prior to filling. Fill through the threaded holes or by clamping shut
one end, holding the cell upright, and filling through the other hole. Working (and counter) electrodes need to
be made ready if not in place prior to filling.
If you are assembling your ParaCell for the first time, you may want to check for leaks after assembly. Because
this cell is not designed to be pressurized, this is most easily accomplished by adding a small amount of dye to
water, filling the cell, and setting it on some paper towels. A slow leak may not leave the paper towels damp but
will leave behind the color.
Along with the two electrode/sample holes at on each cell end, there are four threaded joints. These have a #7
internal thread; the standard #7 bushings and O-rings fit them. Working and counter (or second working)
electrodes are designed to be clamped in the end plates. A reference electrode in the included bridge tube
should go through the top #7 port on the same end plate as the working electrode. Gas dispersion can be
accomplished by running a bubbling line into one of the other threaded ports; make sure that there is an open
vent.
Pay careful attention to cell cleanliness. In many corrosion testing situations, contaminants in
the cell and test solution are not a problem if you take minimal precautions.
In other cases, trace contaminants can lead to poorly reproducible results. One example is a study of
corrosion in tap water.If you touch the cell components with your fingers, you can inadvertently add salts
and organic compounds to your cell solution. We recommend that you carefully clean the cell components
using good laboratory practice. After the components are clean, avoid touching their wetted surfaces.