Connecting
6
6.1
Basic safety notes
CAUTION
Incorrect loop current
Device damage or fire hazard of the 250 Ω input resistance in the SITRANS MX300 due to
incorrect loop current.
• Maintain the maximum loop current per channel of 35 mA.
NOTICE
Condensation in the device
Damage to device through formation of condensation if the temperature difference between
transportation or storage and the mounting location exceeds 20 °C (36 °F).
• Before taking the device into operation, let the device adapt for several hours in the new
environment.
Note
Improvement of interference immunity
• Lay signal cables separate from cables with voltages > 60 V.
• Use cables with twisted wires.
• Keep device and cables at a distance from strong electromagnetic fields.
• Take account of the conditions for communication specified in the Technical data (Page 71).
• Use shielded cables to guarantee the full specification according to HART/PA/FF/Modbus/
EIA-485/Profibus DP.
WARNING
Risk of lightning strikes
A lightning flash may enter the mains cables and data transmission cables and jump to a person.
Death, serious injury and burns can be caused by lightning.
Take the following precautions:
• Disconnect the device from the power supply in good time when a thunderstorm is
approaching.
• Do not touch mains cables and data transmission cables during a thunderstorm.
• Keep a sufficient distance from electric cables, distributors, systems, etc.
SITRANS CC240 and SITRANS MX300
Operating Instructions, 06/2021, A5E47280695-AB
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