Alpha Technologies PowerAgent SC3 - Manual (Page 47)

PowerAgent TM SC3 Site Controller Document # 700-000014-01 Rev 2
Installation and Operation
Phoenix Broadband Technologies, LLC 10/28/2010
Page 47 of 57
6.5.4.3 Provisioning the Baseline
The baseline allows the admittance to be tracked based on an Initial Cell Admittance value.
Once this value is established admittance change alarms can be generated based on the percent
change from the initial value. The following sections describe two ways of establishing the
baseline.
6.5.4.4 Baselining using the Present Measurement
For new jars PBT recommends setting the baseline using the present admittance measurement
as a reference. With this approach the Admittance Change field will report the difference
between the present sensor reading and the reading when the jar was new. This is the simplest
and most accurate way to set the baseline. This method also works with jars that are not new,
however keep in mind that the reference was taken at an unknown point in the jar life span.
6.5.4.5 Baselining using Manufacturer’s Specifications
The Base can also be set using the jar manufacturer’s specified Admittance (or conductance) as
the basis for the measured admittance value. Sometimes the manufacturer specifies a DC
resistance or a short circuit current which allows the admittance to be calculated. Contact PBT if
you need help with this. With this approach the Admittance Change field will report the
difference between the present sensor reading and the manufacturer’s specification. Keep in
mind that the manufacturer’s specified Admittance (or Conductance) is based on measurements
made with an instrument and is subject to all of the variation factors listed above. In addition
most Manufactures specify a +/- 20 % tolerance on their specified value.
6.5.4.6 Setting a Baseline
Pressing the “S” button next to the Initial Cell Admittance label in the Single Jar Display screen
causes the Jar Setup
Display screen to
appear as shown
below.
To set a baseline
based on a
specification, enter the
baseline admittance
reading into the Set
Initial Cell
Admittance field.
Press either the Set
This Jar Only button
to set the baseline for
this jar, or Set Entire
String button to copy
this baseline to the
entire String. The
value will appear in
the Initial Cell
Admittance field and
the date and time will
be recorded for
reference. The Cell
Admittance Change
field in the Single Jar
Display will be
updated to show the