Main Menu: Measuring Functions (Menu 3) - Siemens SITRANS F US Operating Instructions Manual

6.3

Main menu: Measuring functions (menu 3)

The range and limit values can be displayed as follows:
Volume flow (volume unit per time) or mass flow (mass unit per time).
The volume flow qv is converted to mass flow qm with the density entered (qm = qv * ρ in menu
"Density").
Depending on the selection made, the quantities in menu "1.3 Totalizer" are specified in the
function group "Display".
Flow, sound velocity and amplitude US: Menu 3.1, 3.2 and 3.3
The measuring variables flow, sound velocity or ultrasonic amplitude can be assigned to the
analog output and the limit value message to digital output 2. The appropriate measuring
ranges and limit values are set in the subsequent sub-menus.
Every sub-menu is further divided for setting the subsequent values.
– Measuring range full scale value
– Measuring range start of scale value (omitted for flow, start of scale = 0)
– Limit value max (upper limit value)
– Limit value min (lower limit value)
– Hysteresis
– Damping (Filter time constant)
The selection made here defines the unit for several parameters simultaneously:
– for volume or mass flow: Measured value display, measuring range and limit value formation
– for volume or mass: Display, totalizer reading and pulse valency.
Hysteresis
The effect of the hysteresis is shown in figure
Density, menu 3.1.4
The physical unit is selected in menu 3.1.4.
After entering units the display will automatically step into "Density".
The density of the medium is entered in this menu (step 2) to convert the volume flow to mass
flow (see also menu "3.1.1 Units").
Note
Input of density is unnecessary and ineffective when "Volume flow" setting has been selected
in menu "3.1.1 Units ".
Direction, menu 3.1.5.1
Determination of the main flow direction.
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