Main Menu: Device Output (Menu 4) - Siemens SITRANS F US Operating Instructions Manual

6.4

Main menu: Device output (menu 4)

The analog output is only active for devices with HART interface.
Analog output select
4.1.1
There are three types of measurements which can be assigned to the analog output:
• Flow
• Sound velocity
• US amplitude
Current limit, menu 4.1.2
The upper current limit for the output signal is determined in this menu item.
Error signal, menu 4.1.3
In case of an error (see table "Error messages") the analog output has one of the following error
signals:
The following settings are possible:
-
-
-
-
-
With the "Hold 5 s" setting, brief disturbances (e.g. air entrapped in the medium) can be bridged
for about 5 seconds without an error message via the analog signal.
The same applies for "Hold 20 s", "Hold 40 s" etc.
The last valid measured value is output during the disturbance. If the disturbance lasts less than
5 s the current measured value is output after 5 seconds. If the disturbance persists (eg
disturbance lasts longer than 5 s), the output signal is set to 3.6 mA after 5 seconds.
In the "Hold continuous" setting, the last valid value is output for as long as the disturbance
persists, helpful in the configuration is the possibility of selectively suppressing error messages,
see menu 2.2.
Analog output Assignment of a measured
select variable to output signal
3.6 mA
22 mA
24 mA
Hold for a defined time (5, 20, 40, 60, 120 or 240 seconds), then 3.6 mA
Hold continuous
SFIDK.PS.029.E5.02 / SW 2.01.07
Flow
Current limiting
Flow
Sound velocity
US amplitude
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