ABB FS4000, Operating Instruction

Page: 46 / 126

Electrical connections
46 FV4000 / FS4000 D184B097U02
5.5 Configuration of the switching output
The switching output can be configure as both a NAMUR contact and an optocoupler.
G00720
1 K
10 K
41
42
41
42
Rotary switch counterclockwise:
NAMUR contact
Rotary switch clockwise: optocoupler
Fig. 37: Switching output circuit diagram
The switching output of the transmitter is factory-configured on the basis of the order code. The
following table lists contact types and their matching order codes and Ex approval.
Order code Ex approval Contact type
VT40, VR40, ST40, SR40 None optocoupler
VT41,VR41, ST41, SR41 Ex ib / Ex nA [nL] NAMUR contact
VT42, VR42, ST42, SR42 Ex d / Ex ib / Ex nA [nL] Optocoupler
VT43, VR43, ST43, SR43
C
FM
US
Optocoupler
VT4A, VR4A, ST4A, VR4A II 2G EEx ia IIC T4 NAMUR contact
If necessary, the switching output can be modified subsequently should prevailing site
conditions change.
1. Disconnect the flowmeter from the line supply.
2. Unscrew the front housing cover. The lock on the cover needs to be undone first on meters
for hazardous areas.
Important
Observe the waiting times for meters for hazardous areas (see the section titled 11 „Ex
relevant specifications“.)
3. Remove the transmitter from the housing. To do this, unscrew the three Phillips head screws
and carefully take the transmitter out of the housing.