2. Function and features
The VS2000 Exi control monitor is designed to work with flow sensors of intrinsi-
cally safe design Ex"i". It meets the requirements according to EN50014 and
EN50020 (intrinsic safety "i").
The explosion group indicated on the unit as well as special conditions have to be
taken into account according to EC type test certificate PTB 01 ATEX 2075.
Marking:
• The unit provides intrinsically safe voltage supply for the sensors, evaluates the
signals from the sensors and signals whether a preset flow value has been
reached:
• Flows of either liquids or gases can be monitored.
• In addition the VS2000 Exi monitors the sensor cable: In the case of wire break
and short circuit the monitoring relay deenergises, the red LED is on.
3. Installation
The VS2000 Exi must be mounted outside the Ex zone.
• Mount the unit in a control cabinet with a protection rating of at least IP 54 to
guarantee protection against accidental contact with dangerous contact voltages
and against atmospheric influence.
• The control cabinet should be installed in accordance with local and national rules
and regulations.
• Mount the unit on a DIN rail.
• Mount the unit vertically and leave enough space between the unit and the top
and bottom of the control cabinet to enable air circulation to avoid excessive heat-
ing.
When
several units are mounted side by side
the internal heating of all
units has to be considered. The ambient temperature for the individual unit
must not exceed the permissible value of +60°C.
Page 3
flow above the preset value
output relay is energised
flow below the preset value
output relay is deenergised
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2
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21
13
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3
9
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8
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II (1) G [EEx ia] IIC
