13
SAFETY
Supply Voltage max. Uo = 30 V DC
Current Output max. Io = 100 mA
Power max. Po = 0.75W
The specified values of Lo and Co for the power supply need to be greater than Ci + Ccable
and Li + Lcable.
Internal Inductance Li < 40 µH
Internal Capacitance Ci < 4.5 nF
For SPX’s that are not approved or are explosion proof approved for Class I,
Division 1, Groups A, B, C & D the power supply rating is 16-36 Vdc.
Additional Comments:
1) Do not remove the transmitter push-button seal screws in explosive environments when the circuit is
live.
2) Transmitter push-button seal screws must be fully engaged to meet explosion proof requirements.
3) Before connecting a HART handheld communicator in an explosive atmosphere, make sure the
instruments in the loop are installed in accordance with intrinsically safe or non-incendive field wiring
practices.
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