Emerson Micro Motion 5700 Installation Manual page 31

Installation Manual
MMI-20075112
Parameter 4-20mA Output
Internal inductance 5µH
(Li)
Hazardous area voltage
The open circuit voltage for the selected barrier must be less than 30 VDC (Vmax = 30 VDC).
Hazardous area current
The short circuit current for the selected barrier must be less than 484 mA (Imax = 484 mA).
Hazardous area capacitance
The 5700 PROFIBUS-PA has the following capacitance (Ci) values:
• mA Output = 0.27nF
• Frequency Output = 11.27nF
This value added to the wire capacitance (Ccable), must be lower than the maximum allowable capacitance
(Ca) specified by the safety barrier.
Use the following equation to calculate the maximum cable length between the transmitter and the barrier:
Ci + Ccable ≤ Ca
Hazardous area inductance
The inductance (Li) of the 5700 PROFIBUS-PA transmitter is 5µH. This value, plus the field wiring inductance
(Lcable) must be lower than the maximum allowable inductance (La) specified by the safety barrier.
Use the following equation to calculate the maximum cable length between the transmitter and the barrier:
Li + Lcable ≤ La
4.7.2 Wire the mA Output for hazardous installations
Prerequisites
WARNING
Meter installation and wiring should be performed only by suitably-trained personnel using the appropriate
government and corporate safety standards.
Procedure
Wire to the appropriate output terminal and pins.
Installation Manual
Wiring the channels
Frequency Output and Discrete Output
5µH
August 2020
31