Heinrichs Messtechnik GmbH
Page 4 of 10
Supplement manual Foundation Fieldbus
3
Characteristic Values
3.1
Supply voltage
9 V... 32 V between terminals 55 and 56
no influence of bus voltage to measuring quality
3.2
Basic current
app. 13 mA
3.3
Baud rate
31.25 kBaud
3.4
Electromagnetic compatibility (EMC)
Refer to operating manual UMC3
3.5
Safety data
Refer to additional operating manual for explosion-proof flow meters
FF- communications circuit
(terminals 55 and 56)
For connecting a certified FF circuit in accordance with the FISCO model (EN 60079-27),
or for connection to intrinsic safe circuits which do not comply to the FISCO model.
The maximum values satisfying safety requirements are the following:
Voltage
Ui
DC 32 V
Current
Ii
280 mA
Power
Pi 2 W
Effective inner inductance
Li
negligible
Effective inner capacitance
Ci 1.2 nF
