Rosemount TankRadar Rex DAU 2100, Руководство по обслуживанию

Страница: 29 / 154

3-15
Rosemount Tank Radar Rex
Chapter 3 Device Description
Service Manual
308012En, Ed.2
May 2013
Minimum level
distance (C) The Minimum Level Distance (C) is defined as the
distance between the Zero Level (Dipping Datum
Point) and Minimum Level of the product surface
(tank bottom). By specifying a C-distance, the mea-
suring range can be extended to the bottom of the
tank. If C>0, negative level values will be displayed
when the product surface is below the Zero Level.
Select the
Show negative level values as zero
check box if you want levels below the Zero Level to
be displayed as Level=0.
If you set the C-distance =0, measurements below
the Zero Level will not be approved, i.e. the RTG will
report an invalid level.
Calibration Dis-
tance Calibration Distance is used for calibration of the
RTG.
Hold Off
Distance (UFM) The Hold Off Distance (also referred to as Upper Fil-
ter Margin) defines how close to the RTG Reference
Point measurements are accepted. Normally this
parameter should not be changed. The Hold Off
Distance may be increased, if for example, there
are disturbing echoes from the tank nozzle.