Emerson Process Management ROSEMOUNT 5300 - Manual (Page 78)

Reference Manual
00809-0100-4530, Rev BA
July 2009
Rosemount 5300 Series
5-6
Hold Off/Upper Null Zone
This parameter should only be changed if there are measurement problems in
the upper part of the tank. Such problems may occur if there are disturbing
objects, such as a narrow nozzle with rough walls, close to the probe. By
adjusting the Hold Off/Upper Null Zone, the measuring range is reduced. See
“Handling of Disturbances from Nozzle” on page C-4 for further information.
Tank Environment Measurement Mode
Normally, the Measurement Mode does not need to be changed. The
transmitter is pre-configured according to the specified model:
Table 5-1. List of Measurement
Modes which can be used for
different 5300 models
Submerged is used for applications where the probe is fully submerged in
liquid. In this mode, the transmitter ignores the upper product level. See
“Interface Measurements with Fully Submerged Probes” on page 7-15” for
more information.
NOTE!
Only use Submerged for applications where the interface is measured with a
fully submerged probe.
Rapid Level Changes
Optimize the transmitter for measurement conditions where the level changes
quickly due to filling and emptying of the tank. As a default standard, a
Rosemount 5300 transmitter is able to track level changes of up to
1.5 in./s (40 mm/s). When the Rapid Level Changes check box is marked, the
transmitter can track level changes of up to 8 in./s (200 mm/s).
The Rapid Level Changes check-box should not be used in normal conditions
when the product surface moves slowly.
Dielectric Constant
For interface measurements, the dielectric constant of the upper product is
essential to obtain good accuracy. See “Interface” on page 2-12 for further
information on dielectric constants. If the dielectric constant of the lower
product is significantly smaller than the dielectric constant of water, you may
need to make special adjustments, see Appendix C: Advanced Configuration
for further information.
For level measurements, the Upper Product Dielectric parameter
corresponds to the actual dielectric constant of the product in the tank.
Model Measurement Mode
5301
• Liquid Product Level (1)
• Interface Level with Submerged probe
(1) Default setting
5302
• Liquid Product Level
• Product Level and Interface Level
(1)
• Interface Level with Submerged probe
• Solid Product Level
5303 • Solid Product Level (1)