VEGA MET407AFT User Manual

VEGAMET 407 AF
VEGAMET 407 AFT

TIB • Technical Information • Operating Instructions

Signal conditioning
instrument

For continuous level
measurement

- for connection of a
capacitive electrode

- or a pressure sensor

VEGA Grieshaber KG

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

407 AF

100

0

50

%

tj

0

VEGAMET

!

Application

The VEGAMET 407 AF or 407 AFT is a signal con­ditioning instrument and is used for level propor-

tional indication (continuous level measurement).

The VEGAMET 407 AF or 407 AFT consists of:

- plastic housing with plug-in socket (series400)

- electronics

- relay output with floating spdt (fail safe)

- front plate with:

- mains control lamp

- indicating instrument

- signal lamp

- potentiometer for full adjustment

- potentiometer for empty adjustment

- potentiometer for integration time

A measuring system consists of:

- signal conditioning instrument VEGAMET 407 AF
or 407 AFT

- capacitive electrode with oscillator or pressure
sensor with oscillator

Additional indicating instruments and auxiliary level
switches can be connected to the current and
voltage output.

Level measurement with capacitive electrodes

a) non-conductive products

Electrode and container wall form a capacitor.
The level changes the dielectric of the capacitor
and therefore its capacitance.

b) conductive products

The fully insulated electrode and product form a
capacitor. The level changes the size of the
capacitor and therefore its capacitance.

In both cases a level proportional measuring cur­rent is generated in the oscillator from the capaci­tance change.

Fault monitoring

The integral fault monitoring detects

- short-circuit or line break of the connection line
to the transducer

- current value of the connection line < 2,5 mA or
> 23,5 mA (e.g. as well as failures of the elec­tronics in the transducer)

If one of the above mentioned failures is detected,
the failure LED lights and the output relay de-ener­gizes, i.e. terminal 16 and 17 are connected
through relays (see electrical connection).

In addition more the output current increases to
approx. 23 mA and the voltage outputs take a
value< 5 V or < 10 V.

Current output

VEGAMET 407 AF
The current output of VEGAMET 407 AF is non­floating with reference to the sensor input and
voltage output, however is floating with reference to
the mains connection.

VEGAMET 407 AFT
The current output of VEGAMET 407 AFT is float­ing.

Level measurement with pressure sensors

The diaphragm of the pressure sensor converts the
hydrostatic pressure of the product linear into a
movement. This movement changes the size of a
capacitor.

The respective oscillator generates a level propor­tional current out of this capacitance change.

The VEGAMET 407 AF or 407 AFT evaluates the
measuring current several times (see page 5).

Integration time

In case of fluctuating product surface it is useful to
smooth the outputs (indication, output 1 - 3), by
adjusting an integration time 0 … 20 sec.

Important note

The period of the integration time orientates on the
filling and emptying time of the vessel, i.e. integra­tion time ≤ filling / emptying time.

Configuration

Function

Technical data

Power supply Value Tolerance Frequency

standard AC 220 V +15 % -10 % 50 / 60 Hz

AC 230 V +10 % -15 %

options AC 110 V 50 / 60 Hz

130 V +15 %
240 V -10 %
260 V

AC 24 V +15 % 50 / 60 Hz

42 V -10 %
48 V

DC 9 … 16 V

16 … 60 V

Power consumption at UN: approx. 7 VA

Voltage for the transducer on
terminals 1 and 2 (terminal 3 and 4 bridged) approx. 22 V

Resistance per conductor to the transducer max. 50 Ohm
Voltage for the transducer on

terminals 1 and 2 (terminal 3 and 4 open)
(only for electrodes with oscillator type 117) approx. 15 V

Resistance per conductor to the transducer max. 50 Ohm
Indication analog indication 0 … 100 %
Output 1 type current output

range 0 … 20 mA or 4 … 20 mA
load max. 750 Ohm
floating VEGAMET 407 AFT

Output 2 type current output

range 0 … 5 V, max. 2 mA

for connection of
max. 10 auxiliary limit switches VEGASEL

Output 3 type voltage output

range 0 … 10 V, max. 2 mA

Output 4 type relay output

function fail safe
contact 1 spdt
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 2 A, DC 1 A

breaking capacity 125 VA, 60 W
Integration time 0 … 20 sec.
Permissible ambient temperature on the housing -20°C … +50°C / -4 … 122°F

Storage and transport temperature -20°C … +70°C / -4 … 158°F
Housing type plastic ABS light grey

protection IP 40
dimensions B = 53 mm, T = 143 mm, H = 127 mm

Terminal board: for cross section area of conductors max. 1 x 1,5 mm

2

Weight: with plug-in socket approx. 710 g