Siemens SITRANS F M MAG 5000, Руководство пользователя, Страница: 19 / 107

Description
3.4 Features
16
● Pulp and paper industry
● Steel industry
● Power generation; utility and chilled water industry
3.4 Features
Power supply
2 different types of power supply are available. A 12 ... 24 V AC/DC and a 115 ... 230 V AC
switch mode type.
Coil current module generates a pulsating magnetizing current that drives the coils in the
sensor. The current is permanently monitored and corrected. Errors or cable faults are
registered by the self-monitoring circuit.
Input circuit amplifies the flow-proportional signal from the electrodes. The input impedance
is extremely high: >10
14
Ω which allows flow measurements on fluids with conductivities as
low as 5 µS/cm. Measuring errors due to cable capacitance are eliminated due to active
cable screening.
Digital signal processor converts the analog flow signal to a digital signal and suppresses
electrode noise through a digital filter. Inaccuracies in the transmitter as a result of long-term
drift and temperature drift are monitored and continuously compensated for via the self-
monitoring circuit. The analog to digital conversion takes place in an ultra low noise ASIC
with 23 bit signal resolution. This has eliminated the need for range switching. The dynamic
range of the transmitter is therefore unsurpassed with a turn down ratio of minimum 3000:1.
CAN communication
The transmitter operates internally via an internal CAN communication bus. Signals are
transferred through a signal conditioner to the display module and to/from internal/external
option modules and the dialog module.
Dialog module
The display unit consists of a 3-line display and a 6-key keypad. The display shows a flow
rate or a totalizer value as a primary reading.
Output module
The output module converts flow data to analog, digital and relay outputs. The outputs are
galvanically isolated and can be individually set to suit a particular application.
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