Rosemount 5402 - Non-Intrinsically Safe Power Supply Wiring

Reference Manual
00809-0100-4026, Rev FA
July 2009
4-7
Rosemount 5400 Series
NON-INTRINSICALLY
SAFE POWER SUPPLY
With a non-intrinsically safe power supply in non-hazardous installations or
Explosion-proof/Flameproof installations, wire the transmitter as shown in
Figure 4-4.
NOTE!
Make sure that the power supply is off when connecting the transmitter.
Figure 4-4. Wiring for
non-intrinsically safe power
supply.
The 375 Field Communicator and the HART Modem require a minimum load
resistance of 250within the loop to function properly. For maximum loop
resistance, see Figure 4-5.
Figure 4-5. Maximum load
resistance for Non-hazardous
installation.
See Figure 4-4 for wiring information.
NOTE!
The diagram is valid only if the HART load resistance is at the + side and if the
- side is grounded, otherwise the load resistance value is limited to 435.
Power
supply
Rosemount 375
Field Communicator
Load resistance
HART Modem
Rosemount 5400 Series
Radar Level Transmitter
PC
250

Operating
Region
Maximum Load Resistance
External Power
Supply Voltage