Vega VEGAMET 308 Manual

VEGAMET 307 / 308
TIB • Technical Information • Operating Instructions
Signal conditioning
instrument
for continuous level
measurement
• for connection of a
capacitive measuring
electrode
or
• a pressure sensor
VEGA Grieshaber KG
Am Hohenstein 113
Postfach 11 42
D-77757 Schiltach
Phone [phone]
Fax [phone]
AB
0 4
mA
VEGAMET 308
020 40 60 80 100
%

Application
These signal conditioning instruments VEGAMET
307 / 308 are used for level proportional output and
indication of levels (continuous level measure-
ment).
The VEGAMET 308 is additionally equipped with
an integral level switch with adjustable switching
hysteresis. Therefore level dependent switching
functions are possible.
The VEGAMET 307 consists of:
• plastic housing with pluggable multipoint connec-
tor (series 300)
• electronics
• front panel with
- analog indicating meter
- mains control lamp
- potentiometer for empty adjustment
- potentiometer for full adjustment
- change-over switch for current output range
0 … 20 mA or 4 … 20 mA.
The VEGAMET 308 consists of:
• as VEGAMET 307
• however additional adjustment elements for the
level switch:
- 2 pressure keys and 2 potentiometers for
adjustment of the switch points
- relay control lamp
- A/B-switch
A measuring system consists of:
• signal conditioning instrument VEGAMET 307 or
VEGAMET 308
• capacitive electrode with oscillator
or
• pressure sensor with oscillator
Additional indicators and auxiliary level switches
can be connected to the current and voltage
outputs.
Level measurement with capacitive electrodes
Electrode, product and vessel wall, or electrode
and product form a capacitor. The capacitance
increases with increasing level.
In either case the oscillator converts this capaci-
tance change into a level proportional measuring
signal. This signal is fed to the VEGAMET 307 or
308 for signal conditioning.
Level measurement with pressure sensors
The diaphragm of the pressure sensor converts the
hydrostatic pressure of the product into a linear
movement. This movement is transmitted to the
plunger-type capacitor. The level of the product
therefore changes the capacitance.
Configuration
Function
2VEGAMET 307 / 308

Power supply 20 … 250 V AC; 48 … 62 Hz
20 … 90 V DC
Power consumption at UNapprox. 3 VA
Measuring signal Connection line 2-wire, unscreened (standard cable)
input Resistance per conductor max. 50 Ohms
Linearity error 0,1 % measuring range
Temperature error 0,01 % measuring range / 10 K
Adjustment data Empty adjustment range 3,5 … 17 mA
Current difference between
empty and full adjustment: > 600 µA
Indication analog indication 0 … 100 %
Current output Range 0 … 20 mA or 4 … 20 mA
(adjustable)
Load max. 750 Ohm
Resolution 0,05 %
Linearity error 0,025 % measuring range
Temperature error 0,025 % measuring range / 10 K
Voltage output Range 0 … 10 V, max. 1 mA (short-circuit protected)
Resolution 0,05 %
Linearity error 0,025 % measuring range
Temperature error 0,025 % measuring range / 10 K
Relay output
(only VEGAMET 308) Contact 1 spdt
Function two-point switching
Mode A/B
Relay data:
Contact material AgCdO and Au plated
min. turn-on voltage 10 mV
switching current 10 µA
max. turn-on voltage AC 250 V, DC 60 V
switching current AC 2A, DC 1 A
max. breaking power 125 VA, 60 W
Permissible ambient temperature (housing) –25°C … +60°C / –4°F … +140°F
Storage and transport temperature –25°C … +70°C / -4°F … +158°F
Housing Type plastic ABS
Protection IP 40
Dimensions w = 96 mm, d = 76 mm, h = 102 mm
Pluggable multipoint connector (cross section area of conductor) max. 2,5 mm2
Weight approx. 270 g
Technical data
3
VEGAMET 307 / 308

Iso-housing IP 55 for series 300 (Option)
Dimensional drawing
100 125 9107
ø4,5
157 9
020 40 60 80 100
%
AB0 4
mA
VEGAMET308
576
102
92
41
3
Terminal board Adapter
96
96
105
80
42
41
Metal link
119
110
92
with transparent cover
89
125
15
on
0 4
mA
VEGAMET 307
AB
0 4
mA
VEGAMET 308
020 40 60 80 100
%
020 40 60 80 100
%
Surface mounting
Panel mounting
4VEGAMET 307 / 308

Mounting instructions
Electrical connection
5
VEGAMET 307 / 308
The instrument is suitable for panel or surface
mounting. The required parts are attached.
Panel mounting
• Pull pluggable multipoint connector on the instru-
ment upwards.
• Screw in and fasten the pin on the rear of the
instrument.
• Push instrument into the front panel cut-out.
• Push the terminal from the back on the pin and
fasten with the screw.
When using the lockable transparent cover pro-
ceed as follows:
• Open cover.
• Push the frame from the back over the upper
instrument edge.
• Further mounting as described above.
Surface mounting
a) Screw fastening
• Push the metal sleeve in the instrument cut-out
(see sketches)
• Fasten the instrument with 3 screws to the
mounting plate.
For increased protection, Iso-housing with transpa-
rent cover (protection IP 55) is available (mounting
of the instrument into the housing as described
under a).
b) Rail mounting (Snap-in)
• Fasten adapter plate for rail TS 35 x 7,5 mm acc.
to EN 50 022 on the back of the instrument with
a screw (spring of the adapter must be below).
• Plug the instrument from the bottom to the carry-
ing rail and push until snap-in.
14
13
12
11
10
9
6
7
8
5
4
3
2
1
+
-
+
+
-
VEGAMET 307 / 308
Current output 0/4 … 20 mA
Mains connection
1
2
N (-)
L (+)
Voltage output 0 … 10 V
1
2
Pressure sensor
with oscillator Electrode with oscillator
Relay output
(with VEGAMET 308)
-
The electrical connection is made on the multipoint
connector acc. to the diagram on the upper part of
the housing.
Standard 2-wire cable can be used between
VEGAMET and transducer.
If electromagnetic interference is expected,
screened cable should be used.
Protective measures:
If voltage spikes are expected, the use of overvol-
tage arresters is recommended.
Observe TIB "overvoltage arresters" for their
connection!
Indicated Current Voltage
value output output
0 % 0 / 4 mA 0 V
100 % + 20 mA + 10 V