Chapter 4 -- Cell Connections--Membrane Cell Connections
4 - 3
Table 4-2
Cell Cable Connections for ZRA Mode
Color Type Name Normal Connection
Blue Banana Plug Working Sense Connect to metal sample #1
Green Banana Plug Working Electrode Connect to metal sample #1
White Pin Jack Reference Connect to a reference electrode
Red Banana Plug Counter Electrode Connect to metal sample #2
Orange Banana Plug Counter Sense Connect to metal sample #2
Black Pin Jack Floating Ground Leave open or connect to a Faraday shield
The counter sense and the working sense lead are each connected to different metal samples. In the ZRA
mode the Interface 1000 is normally programmed to maintain zero volts between these leads. It therefore
maintains the two metal samples at the same voltage.
The white pin jack on the cell cable is normally connected to a reference electrode. The potential between
this lead and the working sense lead is reported as the cell potential.
In ZRA mode, if you don’t have a reference electrode in your cell, we recommend that you connect the white
reference lead to the working electrode. In theory, the measured potential will be exactly zero when this is
done. In practice, A/D noise and offset will create a small potential signal with a value very close to zero.
Membrane Cell Connections
The Interface 1000 can be used with membrane cells. In this type of cell, a membrane separates two
electrolyte solutions. Two reference electrodes are used - one in each electrolyte. Each electrolyte also
contains a counter electrode. The Interface 1000 controls the potential across the membrane. Table 4-3 shows
the cell connections used with a membrane type cell.
Table 4-3
Cell Cable Connections for a Membrane Cell
Color Type Name Normal Connection
Blue Banana Plug Working Sense Connect to reference electrode #1
Green Banana Plug Working Electrode Connect to counter electrode #1
White Pin Jack Reference Connect to reference electrode #2
Red Banana Plug Counter Electrode Connect to counter electrode #2
Orange Banana Plug Counter Sense Leave open (only needed in ZRA mode)
Black Pin Jack Floating Ground Leave open or connect to a Faraday shield
Note that reference electrode #1 and counter electrode #1 must be on one side of the membrane and
reference electrode #2 and counter electrode #2 must be on the other side.
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