Emerson Process Management 5300 Tank Environment, Hold Off/Upper Null Zone, Measurement Mode

Rosemount 5300 Series

Reference Manual

00809-0100-4530, Rev BA July 2009

	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-4for further information.
Tank Environment	Measurement Mode

Table 5-1. List of Measurement Modes which can be used for different 5300 models

Normally, the Measurement Mode does not need to be changed. The transmitter is pre-configured according to the specified model:

Model		Measurement Mode
5301	•	Liquid Product Level(1)
	•	Interface Level with Submerged probe
	•	Liquid Product Level
5302	•	Product Level and Interface Level(1)
	•	Interface Level with Submerged probe
	•	Solid Product Level
5303	• Solid Product Level(1)

(1) Default setting

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

1.5in./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 2-12for 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.

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