VEGA VEGAMET 624 - Manual (Page 13)

13
5 Connecting to power supply
VEGAMET 624 • 4 … 20 mA/HART
28969-EN-130701
Before setting up Ex versions, make sure the Ex separating chamber
is plugged on the left housing side (above the sensor terminals). The
pins for type and Ex coding must also be inserted correctly.
Information:
•
On the active input (terminal 1/2), VEGAMET 624 provides power
for the connected sensors. Power supply and measurement data
are transmitted over the same two-wire cable. This mode is pro-
vided for connection of measuring transducers without separate
operating voltage (sensors in two-wire version).
•
On the passive input (terminals 3/4), the sensors are not supplied
with energy - only the measured value is transmitted. This input is
for instruments with their own separate operating voltage (sensors
in four-wire version or separators such as VEGATRENN 149). On
a VEGAMET 624 in Ex version, the passive input is not available
due to approval/technical reasons.