Emerson manual Rosemount 848L, Reference Manual, 00809-0100-4696,Rev AA September

Reference Manual

00809-0100-4696, Rev AA September 2004

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)

A-3