The counter sense and the working sense lead are each connected to different metal samples. In ZRA
mode, the Reference 600+ 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 do not 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 is exactly zero when this
is done. In practice, A/D noise and offset create a small potential signal with a value very close to zero.
Membrane Cell Connections
The Reference 600+ 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 Reference 600+ controls the potential across the membrane. Table 5-3
shows the cell connections used with a membrane type cell.
Table 5-3
Cell Cable Connections for a Membrane Cell
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