Honeywell 4905 Style Conductivity Cells 70-82-25-18 User Manual
Page 8
Introduction
2
4905 Series Conductivity Cells – Installation and Maintenance
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The cell constant is selected according to the range of the measuring instrument used and the solution
measured. In general, a high-constant cell is used for solutions having low electrical resistance (high
conductivity) and a low-constant cell is used for solutions having high electrical resistance (low
conductivity). Automatic Temperature Compensation (ATC) during the measurement is provided by a
built-in temperature sensing network located near the cross-channel or guard-tube holes.
The cells are molded from Polyethersulfone (PES) which is resistant to most corrosive chemicals over a
wide range of temperatures. (A common exception is chlorinated hydrocarbons.) Sample solutions come
into contact only with the above plastic and the platinum or nickel electrode surface. Any cell can be
supplied with either electrode material.