Installation
Marathon MR Rev. E2 04/2011 25
When using conduit for the cable, and when it has a compression fitting installed on
the conduit connection, the sensor head is rated NEMA-4 (IEC 529, IP65).
The sensor cable may be shortened but not lengthened without the appropriate
terminal block accessory. Longer cables are available from the factory. Limit power
cables to 60 m (200 ft) or less. RS485 cables can be extended up to 1200 m (4000 ft).
Avoid installing the sensor cable in noisy electrical environments such as around
electrical motors, switch gear, or induction heaters.
5.2.3 Power Supply
Connections from a 24 VDC (500 mA or higher) power supply attach to the appropriate terminals on
the electronic enclosure’s terminal strip.
Isolated power is required, and this is provided by the appropriate manufacturer
supplied power supply accessory. Beware of use of other power supplies which may
not provide the necessary isolation and could cause instrument malfunction or damage!
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