85
Reference Manual
00809-0100-4140, Rev AA
January 2017
5.5.7
Dry fork frequency and switching points
The
Dry Fork Frequency
and switching points for
Sensor Status
transitions, can be viewed
as values on a Field Communicator or graphically on the AMS Device Manager.
Dry Fork Frequency
(DFF)
This is the fork frequency recorded when the point level device is calibrated in
dry conditions i.e. air. The frequency is typically 1260 to 1500 Hz.
The default dry fork frequency is established at the point of manufacture. However,
it can be re-established by using the dry fork calibration procedure (
the level detector is installed in a working environment.
The dry fork frequency is also used by the Media Density (
) and Media Learn
functions (
Dry to Too Dry
Upper boundary for frequencies considered to be outside of the normal dry range.
The “too dry” fault is indicated for the enhanced operating mode only.
Dry to Indeterminate
Lower boundary for frequencies considered to be outside of the normal dry range.
Wet to Indeterminate
Upper boundary for frequencies considered to be outside of the normal wet range.
Wet to Too Wet
Lower boundary for frequencies considered to be outside of the normal wet range.
The “too wet” fault is indicated for the enhanced operating mode only.
Zero
The cut-off boundary, below which the sensor frequency is considered to be 0 Hz.
The “zero” fault is indicated for the enhanced operating mode only.
Note
In normal mode, a 0 Hz sensor frequency represents a wet condition (not a fault).
When operating in enhanced mode, a 0 Hz sensor frequency represents a fault condition.
To view the switch points (Field Communicator)
1.
From the Home screen, select
3: Service Tools
.
2.
Select
4: Maintenance
>
1: Diagnostics > 3: Switch Points.
3.
Select items
1:
to
5:
to see individual switching points.
To view the switch points (AMS Device Manager)
1.
Right click on the device and select
Overview
.
2.
Sensor Frequency
is the default mapped dynamic variable TV in the Tertiary
box.
3.
The colored bands on the gauge are based on the switching points.
Fast Keys
3, 4, 1, 3
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