VEGA D77 Hydrostatic pressure transmitters - Manual (Page 4)

4 Pressure transmitters D76 and D77
Product description
1 Product description
1.1 Function and configuration
The pressure transmitters D76 and D77 are
efficient, modular instruments for hydrostatic
level measurement. A dry, metallic-capacitive
cell or the dry, ceramic-capacitive measuring
cell CERTEC
® is used as pressure sensor
element.
The hydrostatic pressure of the product
causes a capacitance change via the metallic
or ceramic diaphragm. This capacitance
change is detected by an ASIC (Application
specific integrated circuit) and converted by
the integrated sensor electronics into a pres-
sure-proportional signal. Precise, high-reso-
lution digital processing of measured data
ensures excellent technical data.
The sensor is powered by a separate VEGA
signal conditioning instrument, a stabilised
power supply unit or a PLC (active). After
adjustment, a standardised 4 … 20 mA cur-
rent signal is available.
To improve reliability, the functionality of im-
portant electronic components is constantly
checked, and internal parameters such as
sensor value, temperature and operating
voltage are closely monitored.
Output signal
An analogue level or pressure-proportional
signal current is used as output signal:
- 5 … 19 mA not standardised (in conjunc-
tion with VEGA signal conditioning instru-
ment)
- 4 … 20 mA standardised
Adjustment
The sensors are available with or without
integrated adjustment functions:
- without adjustment (version A, adjustment
via signal conditioning instrument)
- without adjustment (version C)
- with integrated adjustment (version D)
- with adjustment from external indicating
instrument (version E)
1.2 Types and versions
Suspension pressure transmitter D76
with CERTEC
®
Features
- Compact instrument with integrated elec-
tronics
- Diameter of the transmitter 32 mm
- Connection housing in protection IP 66/IP
67/IP 68
- Electronics as two-wire system 4 … 20 mA
- Power supply 12 … 36 V
- Adjustment/indication in separate housing
VEGADIS 12 possible
Applications
- Level and gauge measurements in water
sewage water, flumes, basins, deep wells,
vessels and tanks
Suspension pressure transmitter D77
with Duratherm 600 diaphragm
Features
- Compact instrument with integrated elec-
tronics
- Diameter of the transmitter 32 mm
- Connection housing in protection IP 66/
IP 67/IP 68
- Electronics as two-wire system 4 … 20 mA
- Power supply 12 … 36 V
- Adjustment/indication in separate housing
VEGADIS 12 possible
Applications
- Level and gauge measurements in water/
sewage water, flumes, basins, deep wells,
vessels and tanks