VEGA D81 Hydrostatic pressure transmitter - Manual (Page 4)

4 Pressure transmitter D81
Product description
1 Product description
1.1 Function and configuration
The pressure transmitter D81 is an efficient
instrument for hydrostatic level measurement.
A dry measuring cell is used as pressure
sensor element.
Pressure transmitter D81 with isolating
diaphragm
Diaphragm: stainless steel, Hastelloy, Tanta-
lum etc.
Series: flanged version
Standard application: level measurement of
highly corrosive products under high proc-
ess temperatures.
The hydrostatic pressure of the medium
effects a capacitance change in the ceramic
measuring cell. This capacitance change is
detected by an ASIC (Application Specific
Integrated Circuit) and converted into a pres-
sure-proportional signal by the integrated
electronic module with microcontroller. Pre-
cise, high-resolution digital processing of
measurement data ensures excellent techni-
cal data.
To improve reliability, the functionality of im-
portant electronic components is continu-
ously checked, and internal parameters such
as sensor value, temperature and operating
voltage are closely monitored.
Output signal
The output signal is transferred as a digital or
analogue signal from the pressure transmitter
to the signal conditioning instrument:
• analogue output signal
- unstandardised (in conjunction with
VEGA signal conditioning instrument)
- 4 … 20 mA standardised
• digital output signal (VBUS) for connection
to a digital VEGA signal conditioning instru-
ment (VEGAMET 514V, 515V or VEGALOG
571)