Badger Meter SRD/SRI Valve Positioners - Manual (Page 58)

Friction Measurement and Display
This page only shows measurements and alarms . The configurations are
done on the Friction page under Parameter .
The Load Factor Values show the present Measured Value and drag
pointers for the Minimum Value, Maximum Value and the Average Value
over time .
The Alarm Factor Alarm Limits as well as the Load Factor / Friction Alarms
on this page are just for information and need to be configured on
the configuration page . These alarms are activated once the average
measurement has exceeded the alarm thresholds defined under the
upper and lower limit .
Set Reference Value (Set Ref. )
This function allows setting a fingerprint of a certain stem friction level (Average Reference) with a time stamp (Reference Time)
for the hours in operation . To set the Friction Reference click on the Set Ref. button . Then the Average Value in connection with
the time-stamp (Reference Time) is saved to the positioner . To ensure that the positioner has saved the data, click on Update .
Message Status Description / Explanation Recommended Action
High Friction Alarm Service / Maintenance Required The friction of the Stem packing
has increased and causes the stem
movement to change beyond the
specified maximum value .
Please check the packing for
irregularities . Maybe the packing is
just too tight . Loosen the packing
and use the Audit Trail to inspect the
movement .
Low Friction Alarm Service / Maintenance Required The friction of the Stem- packing
has reduced and causes the stem
movement to change below the
specified minimum value .
Please check the packing for a
possible leakage . Tighten the packing
and use the Audit Trail to inspect the
movement .
Friction History
The Friction History shows a Histogram displaying the duration of the
average friction measurement over time . The duration is illustrated in
percent of the total time . The vertical line in the middle of the Friction
History shows the Reference Value (Average Value) within a variation of
+/–5% .
The columns of the Histogram identify two states: To the left a decrease
in friction (Less) and to the right an increase in friction (More) is
displayed . Color coding from green (=OK) to yellow (=Maintenance
Required) and red (=Failure) indicate the state of the friction .
The reference column shows the average value +/- 5% . The columns to
both sides show friction changes such as:
Less: –5 to –25%, –25 to –50% and –50 to –100% decrease in friction
More: 5 to 25%, 25 to 50% and 50 to 100% increase in friction
Configuration / Parameter
Page 58 August 2014 POS-UM-00011-EN-02