Siemens SITRANS FUS1010 NEMA-4X/ IP 65 manual Application Data Menu Explanations for UniMass Table

Section 2 1010NFM-3J

The table is built by inputting a series of data points—two inputs and two outputs each:

zInput data consists of sonic velocity (Vs) and temperature.

zOutput data consists of specific gravity (S.G.) and viscosity (cS) at the specified Vs and tem- perature.

Ideally, each point contains four empirically derived values. However, when enough data exists to per- mit it, the table editing routine interpolates missing values based on prior user-entered data.

The UniMass feature expands the basic utility of the flowmeter by synergistically combining its ability to measure sonic velocity and temperature with user-provided data regarding the process liquid or family of liquids. The resulting instrument is virtually a liquid analyzer, in addition to measuring mass flowrate and automatically compensating for viscosity variation.

UniMass Table operations are most successfully employed when the application liquids or family of liquids are fairly well-controlled. Basic table data can be obtained by a variety of means:

zFrom handbooks of physical or chemical data.

zDirectly measured in the laboratory using your 1010, its RTD temperature sensor and a non- flowing measurement cell (standpipe).

zAfter installation on the process pipe if specific gravity and/or viscosity data regarding the liquid can be locally obtained via samples or from on-line instrumentation.

Although the UniMass Table is designed to permit both temperature and sonic velocity to be active input variables, UniMass provides Constant Vs and Constant Temp table editing capabilities as well. The resulting lookup function then associates specific gravity and/or viscosity with either temperature or sonic velocity only.

APPLICATION DATA MENU EXPLANATIONS FOR UniMass TABLE

The UniMass Table resides within the Application Data menu, however, in Flow Tube (FT) instruments it resides within the [Liquid Data] menu.

[UniMass Table] - Press the <Right Arrow> to access the UniMass data point editor.

[Disable] - Press the <Right Arrow> to access tables and enable UniMass routine.

The currently active table will be shown highlighted next to the [UniMass Table] menu cell. If no table is active then [Disable] will appear highlighted next to the [UniMass Table] menu cell.

[Constant Temp] - Press the <Right Arrow> to access. The [Constant Temp] UniMass Table can be used for multiple liquid applications with tightly controlled constant temperature or single liquid applica- tions with varying temperature (ideal if temperature is not measured).

This function simply associates changes in liquid sound velocity with changing SG and Viscosity.

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