Micropilot S FMR533 4 to 20 mA HART Wiring
Endress+Hauser 25
Overvoltage protector
•
The level transmitter Micropilot S is equipped with an internal overvoltage protector (600 Vrms
surge arrester) according to EN/IEC 60079-14 or EN/IEC 60060-1 (impulse current test 8/20 μs,
Î = 10 kA, 10 pulses). Additionally, the device is protected by a galvanic insulation of 500 Vrms
between the power supply and the (HART) current ouput. Connect the metallic housing of the
Micropilot S to the tank wall or screen directly with an electrically conductive lead to ensure
reliable potential matching.
• Installation with additional overvoltage protector HAW560Z/HAW562Z (see XA00081F-B
"Safety instructions for electrical apparatus certified for use in explosion-hazardous areas").
– Connect the external overvoltage protector and the Micropilot S transmitter to the local
potential matching system.
– Potentials shall be equalised both inside and outside the explosion hazardous area.
– The cable connecting the overvoltage protector and the Micropilot S transmitter shall not
exceed 1 m in length.
– The cable shall be protected e.g. routed in an armoured hose.
Power supply
• For stand alone operation via two Endress+Hauser RN221N.
• Integrated in tank gauging system via Endress+Hauser Tank Side Monitor NRF590
(recommended operation mode).
Highly accurate measurement
For highly accurate measurements the measured variable must be transmitted using HART protocol
to ensure the necessary resolution.
4.2.1 Connection to Tank Side Monitor NRF590
"Wiring with Tank Side Monitor NRF590", → ä 23.
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