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Reference Manual
00809-0100-4696, Rev AA
September 2004
A-3
Rosemount 848L
Isolation
Input-Output
1200 VDC; 600 V rms 50/60 Hz for dry
and 2-wire NAMUR contact inputs
No isolation when using 3-wire sensors
Input- Foundation Fieldbus
1200 VDC; 600 V rms 50/60 Hz
Output- Foundation Fieldbus
1200 VDC; 600 V rms 50/60 Hz
Input power- Foundation Fieldbus
1200 VDC; 600 V rms 50/60 Hz
Input / Output Power Requirements
24 VDC nominal, 9 VDC minimum, 32 VDC maximum
Supply Current Rating 0.5 amps at 24 VDC plus output load
Fieldbus Segment Power
Powered over the H1 Foundation fieldbus with standard fieldbus power
supplies. The logic transmitter operates between 9.0 and 32.0 VDC at 22
milliamps.
Transient Protection (consult factory for availability)
The transient protector (option code T1) helps to prevent damage to the
transmitter from transients induced on the bus/power wiring by lightening,
welding, heavy electrical equipment, or switch gears. This option is installed
at the factory for the Model 848L and is not intended for field installation.
ASME B 16.5 (ANSI)/IEEE C62.41-1991
(IEEE 587), Location Categories A2, B3.
1 kV peak (10 x 1000 S Wave)
6 kV / 3 kA peak (1.2 x 50 S Wave 8 x 20 S Combination Wave)
6 kV / 0.5 kA peak (100 kHz Ring Wave)
4 kV peak EFT (5 x 50 nS Electrical Fast Transient)