User guide

I-E67-84-1B February,2002 8-8
State Function Programming
Mode
PH Used to measure the pH of a solution. Basic/Advanced
Process variable engineering units are
pH.
ORP Used to measure the Oxidation Reduction Basic/Advanced
Potential (ORP) of a solution. Process
variable engineering units are
milliVolts (mV).
PION Used to measure the concentration of a Basic/Advanced
specific ion in a solution. The sensor
must use a measurement electrode
specific to the ion of interest.
Process variable engineering units are
milliVolts (mV).
ION.CON Used to measure the concentration of a Advanced
specific ion in a solution. The sensor
must use a measurement electrode
specific to the ion of interest.
Process variable engineering units are
set by the user, and the output is
directly proportional to those units
and is established by the number of
concentration decades.
pH Analyzer State (Basic/Advanced)
The pH Analyzer State contains three types of
sensors: Glass, Antimony, and Custom. Table
8-3 describes the function and programming
mode of each state.
Table 8-3. pH Analyzer States
State Function Programming
Mode
PH.GLAS Used when the associated sensor has a Basic/Advanced
standard glass measuring electrode.
ANTMNY Used when the associated sensor has an Basic/Advanced
antimony measuring electrode.
CUSTOM Used when the associated sensor has a Advanced
measuring electrode with a unique
isopotential point and asymmetric
potential.
For Advanced configurations using the PH.GLAS
and ANTMNY Analyzer States, the REF Z (i.e.,
reference impedance) value can be manually set
to a new value or left at the default value of
100 kohms. The REF Z is the reference
electrode impedance value that will trigger a
diagnostic condition. This value is set using