Gamry Instruments MultiPort, Operator'S Manual

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Assembly--Attaching Gas Tubing to the Cell
13
Attaching Gas Tubing to the Cell
The hose barb on the side of the Gas Flow Adapter can be used as a vent or as an inlet for blanket gas.
Connect the gas-flow system and add the cell electrolyte before the needle valve is turned on. Open the valve
slowly, while you watch the bubbles in the cell. Bubbling should not be vigorous enough to splash large
quantities of electrolyte on the cell walls.
In addition to the needle valve, a three-way valve is very useful in purge and blanket gas control. Three-way
valves are available in both electrically switched and manual versions. A three-way valve switches one gas
stream so it flows from a single inlet to one of two outlets.
If your system includes a three-way valve for switched purge and blanket gas control, we recommend that you:
• Connect the purge gas to the top adapter on of the Gas Dispersion Tube.
• Connect the blanket gas to the lower adapter of the Gas Dispersion Tube.
• Use the spare port to provide a vent. A small hole poked into one of the polyethylene stoppers in the
cell kit is generally a sufficient vent.
If you do not have a three-way gas control valve, you can switch from purge mode to blanket mode manually
by switching the tubing from the top to bottom hose barb.
Sample Holder Assembly
The Sample Holder is generally the last part inserted into the cell. If you are deoxygenating your test solution,
do so before placing the Test Sample into the solution.
Warning:
Your gas flow system should include a needle valve to control the gas flow rate.
Make all gas tubing connections to the cell with this valve
turned all the way off
. Making connection with a
cell filled with electrolyte or adding electrolyte to a system when the gas flow is on can lead to severe
accidents. Excessive gas flow can damage the cell and result in a loss of electrolyte. In extreme cases, this
can represent a significant safety hazard.
Warning:
If you use purge of blanket gas, you must provide a vent for the gas to escape the
cell. The MultiPort was not designed to withstand gas pressure! Failure to vent the cell can cause damage to
the cell, uncontrolled loss of electrolyte from the cell, and risk of personal injury to the cell’s operator.