VEGA D77 User Manual
Operating Instructions
Hydrostatic pressure transmitters
D76 and D77
Level and Pressure
p
Contents
Safety information ........................................................................ 2
Note Ex area ................................................................................ 2
1 Product description
1.1 Function and configuration .................................................. 4
1.2 Types and versions ............................................................. 4
1.3 Electronics version without adjustment.............................. 5
1.4 Electronics version with integrated adjustment in
connection housing.............................................................. 6
1.5 Electronics for connection to VEGADIS 12 ........................ 6
2 Technical data
2.1 Data ....................................................................................... 7
2.2 Approvals and certificates ................................................ 10
2.3 Dimensions ......................................................................... 11
Contents
Safety information
Please read this manual carefully, and also take
note of country-specific installation standards
(e.g. the VDE regulations in Germany) as well
as all prevailing safety regulations and accident prevention rules.
For safety and warranty reasons, any internal
work on the instruments, apart from that involved in normal installation and electrical connection, must be carried out only by qualified
VEGA personnel.
2 Pressure transmitters D76 and D77
Note Ex area
Please note the approval documents (yellow
binder), and especially the included safety
data sheet.
Contents
3 Mounting
3.1 Mounting instructions ......................................................... 13
3.2 Compensation of the atmospheric pressure ................... 13
4 Electrical connection
4.1 Connection instructions ..................................................... 14
4.2 Terminal assignment .......................................................... 15
4.4 Connection examples ........................................................ 16
4.3 Connection to VEGABOX 01 ............................................. 16
5 Setup
5.1 Sensor without adjustment ................................................ 18
5.2 Adjustment with the adjustment insert in the sensor ...... 18
6 Diagnostics
6.1 Maintenance ....................................................................... 20
6.2 Failure rectification ............................................................. 20
7 Instrument modification
7.1 Retrofitting of adjustment insert ........................................ 21
Pressure transmitters D76 and D77 3
1 Product description
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
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 pressure-proportional signal. Precise, high-resolution 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 current signal is available.
To improve reliability, the functionality of important 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 conjunction with VEGA signal conditioning instrument)
- 4 … 20 mA standardised
®
is used as pressure sensor
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 electronics
- 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 electronics
- 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
®
4 Pressure transmitters D76 and D77
Product description
1.3 Electronics version without adjustment
Electronics version A:
Pressure transmitter for connection to VEGA signal conditioning instruments
VEGAMET
VEGABOX 01
VEGALOG
Electronics version C:
Pressure transmitter 4 … 20 mA
VEGABOX 01
VEGAMET
VEGALOG
PLC/DCS
PLC/DCS
Pressure transmitters D76 and D77 5
Product description
1.4 Electronics version with integrated adjustment in connection housing
Electronics version D:
Pressure transmitter 4 … 20 mA adjustable
Adjustment in connection housing
S
Op
Zt
i
43215
+
-
4...20mA
12V...36V DC
Bedieneinsatz
operating unit
PLC/DCS
VEGABOX 01
S
Op
Zt
i
43215
+
-
4...20mA
12V...36V DC
Bedieneinsatz
operating unit
PLC/DCS
1.5 Electronics for connection to VEGADIS 12
Electronics version E:
Pressure transmitter 4 … 20 mA
Adjustment in VEGADIS 12
6 Pressure transmitters D76 and D77
VEGADIS 12
DISPLAY
TRANSMITTER
DISPLAY
TRANSMITTER
OPERATE
OPERATE
OPERATE
OPERATE
ti
ti
ZERO
ZERO
END
END
ZERO
ZERO
POINT
SPAN
POINT
SPAN
VEGADIS 12
DISPLAY
DISPLAY
TRANSMITTER
TRANSMITTER
OPERATE
OPERATE
OPERATE
OPERATE
ti
ti
ZERO
ZERO
END
END
ZERO
ZERO
POINT
POINT
SPAN
SPAN
PLC/DCS
PLC/DCS
12
300
600
900
18 24 30 36
Product description
2 Technical data
2.1 Data
Supply and signal current circuit (analogue transmission, 4 … 20 mA)
Power supply 12 … 36 V DC
Residual ripple of the power supply no influence at U
Output signal
- terminal insert analogue transmission (not standardised)
4 … 20 mA
- adjustment insert 4 … 20 mA (adjustable)
Current limitation approx. 22 mA
Fault signal 22 mA
Integration time 0 … 10 s (adjustment time from 10 % … 90 %
of measuring range final value)
Average delay time 85 ms
Connection cable 2-wire
Max. permissible load depending on power supply
see following load diagram
Load in W
< 100 mV
SS
Integrated overvoltage protection (option)
Pressure transmitters D76 and D77 7
Nominal d.c. spark-over voltage
- protective diode 40 V
- gas separator 650 V
Nominal discharge current
- gas separator 20 kA
Supply voltage
in V
Product description
Measuring ranges
Nominal meas. range Gauge pressure Low pressure Pressure transmitters
resistance resistance D76 D77
D76 / D77
Gauge pressure
0 … 0.1 bar 10 bar / – -0.1 bar • –
0 … 0.2 bar 15 bar / – -0.2 bar • –
0 … 0.4 bar 20 bar / 10 bar -0.4 bar • •
0 … 1.0 bar 25 bar / 25 bar -1.0 bar • •
0 … 2.5 bar 35 bar / 25 bar -1.0 bar • •
0 … 5.0 bar 45 bar / 25 bar -1.0 bar • •
0 … 10.0 bar 60 bar / 25 bar -1.0 bar • •
0 … 20.0 bar 90 bar / 25 bar -1.0 bar • •
Zero -20 % … +95 % of nominal measuring range
adjustable
Span 3.3 % … 120 % of nominal measuring range
adjustable
Recommended turn down with
accuracy class 0.25 up to 1 : 5
Adjustment elements
Pressure transmitters
- terminal insert without adjustment elements
- adjustment insert 2 keys, 1 rotary switch
Measuring accuracy (similar to DIN 16 086, DIN V 19 259-1 and IEC 770)
Deviation
Reference conditions acc. to IEC 770
- temperature 15°C … 35°C
- moisture 45 % … 75 %
- air pressure 860 mbar … 1060 mbar
Determination of characteristics limit point adjustment acc. to DIN 16 086
Characteristics linear
Deviation in characteristics
Hysteresis
Repeatability
1)
1)
Influence of the ambient temperature in general
Average temperature coefficient
of the zero signal
1) 2)
1)
< 0.25 % with accuracy class 0.25
< 0.02 % ceramic measuring cell
< 0.05 % metallic measuring cell
< 0.02 % ceramic measuring cell
< 0.05 % metallic measuring cell
< 0.15 %/10 K with accuracy class 0.25
1)
Relating to the nominal measuring range.
2)
In the compensated temperature range of 0°C … +80°C, reference temperature 20°C.
8 Pressure transmitters D76 and D77
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