For compliance with EN-IEC 61010 (also harmonized under EU
Low Voltage directive 2006/95/EC) the SPU requires an external
power supply, limited-energy (< 30 Vdc max. 8A), and reinforced
insulation between input and output by the safety transformer and
appropriate distance between components on the PCB.
Do not open the rear compartment when device is energized.
The electronics requires a (preferably) 24VDC (nominal) power supply. A
combined power supply and communication cable between the electronics
enclosure and the external equipment can be used. For example; 2x2 wire
(min. Ø 0.5 mm) twisted-pair max. 700m, max. 5Ω/wire. Armoured shielded
cable is recommended to provide protection against mechanical damage
and electrical interference.
In case the ultrasonic flow meter body is connected to a cathodic
protection system, DO NOT CONNECT the ground of the external
power supply to the ground (GND) of the field terminal power
connection (TB1).
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