VEGA MET307 User 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]

A

B

0 4

mA

VEGAMET 308

0

20

40

60

80

100

%

Application

These signal conditioning instruments VEGAMET
307 / 308 are used for level proportional output and
indication of levels (continuous level measure­ment).

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 connec­tor (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 capaci­tance 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

Power supply 20 … 250 V AC; 48 … 62 Hz

20 … 90 V DC

Power consumption at U

N

approx. 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 mm

2

Weight approx. 270 g

Technical data

Iso-housing IP 55 for series 300 (Option)

Dimensional drawing

100

125

9

107

ø4,5

157

9

0

20

40 60

80

100

%

AB0 4

mA

VEGAMET308

5

76

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

A

B

0 4

mA

VEGAMET 308

0

20

40

60

80

100

%

0

20

40

60

80

100

%

Surface mounting

Panel mounting

Mounting instructions

Electrical connection

The instrument is suitable for panel or surface
mounting. The required parts are attached.

Panel mounting

• Pull pluggable multipoint connector on the instru­ment 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 pro­ceed 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 transpa­rent 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 TS35 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 carry­ing 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 overvol­tage 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

• Adjust the requested current output range
0 … 20 mA or 4 … 20 mA.

• Feed supply voltage, should comply with the

voltage stated on the connection diagram.

• Carry out adjustment and switch point adjustment
(VEGAMET 308) acc. to the following description.

Potentiometer for
empty adjustment

Multipoint
connector

Indicating meter

Potentiometer for
full adjustment

Mains control lamp

Potentiometer for
adjustment of the
max. switch point

Relay control lamp

Potentiometer for
adjustment of the
min. switch point

Key for indication and
adjustment of the max.
switch point

A / B switch

Key for indication and
adjustment to the min.
switch point

Switch for
current output

A

B

0 4

mA

VEGAMET

308

0

20

40

60

80

100

%

Indicating and operating elements

Start-up

only VEGAMET 308

Adjustment

Empty and full adjustment via the spindle potentio­meter. The integrated slide clutch avoids overwin­ding.

Before either adjustment each potentiometer must
be turned by approx. 22 turns clockwise.

In practice 3 versions are possible to carry out the
empty / full adjustment.

a) The level can be set to the required min. level

(= 0%) and max. level (= 100 %)

Empty adjustment

• Set level to the required min. level.

• Adjust the indication of the instrument to 0 % by
the potentiometer for empty adjustment.

Full adjustment

• Set level to the required max. level.

• Adjust the indication of the instrument to 100 %
by the potentiometer for full adjustment.

b) The level in the vessel can be set to the

required min. level (= 0 %), but only to a max.
level < 100 %

Empty adjustment

• Set level to the required min. level.

• Adjust the indication of the instrument to 0 % by
the potentiometer for empty adjustment.

Full adjustment

• Set product to the highest level and check with
dip measure (e.g. 80 %).

• Adjust the indication of the instrument to the
checked value (in the example 80 %) with the
potentiometer for full adjustment.

c) The level in the vessel can be only set to a

min. level of > 0 % and a max. level ≤ 100 %

Empty adjustment

• Set product to the low level and check with dip
measure (e.g. 20 %)

• Set indication of the instrument to 0 % with the
potentiometer for empty adjustment.

Full adjustment

• Set level to highest possible level and check with
dip measure (e.g. 60 %).

• Calculate the indicated value to be adjusted:
highest level minus lowest level = indicated value
to be adjusted.
In the example: 60 % – 20 % = 40 %.

• Set indication of the instrument to the calculated
value (in the example 40 %) with potentiometer
for full adjustment.

• Set the indication of the instrument to the actual
level (highest level, in the example 60 %) with
the potentiometer for empty adjustment.

VEGA Grieshaber KG

Am Hohenstein 113
Postfach 11 42
D-77757 Schiltach
Phone [phone]

Switch point adjustment (only possible on VEGAMET 308)

• Set A/B-switch acc. to the following description to the desired mode A or B.

Mode A

When exceeding the adjusted max. level:

Relay de-energized
Relay control lamp lights
Terminals 9-10 are connected through relay

Mode B

When decreasing the adjusted min. level:

Relay de-energized
Relay control lamp lights
Terminals 9-10 are connected through relay

• Adjust switch point for min. level
Push button for adjustment of the min. switch point and adjust the potentiometer of

the indicating instrument to the desired min. value.

• Adjust switch point for max. level
Push button for adjustment of the max. switch point and adjust the potentiometer

of the indicating instrument to the desired max. value.

Adjustment for single-point switching

• Push button for adjustment of the max. switch point and set the indicating instru­ment with the respective potentiometer to "0".

• Push button for adjustment of the min. switch point and set the indicating instru­ment with the respective potentiometer to the required value.

Note:

The switching hysteresis is in this case 0,5 %.