Electrical connection Levelflex FMP55 HART
48 Endress+Hauser
7.1.5 Overvoltage protection
If the measuring device is used for level measurement in flammable liquids which requires the
use of overvoltage protection according to DIN EN 60079-14, standard for test procedures
60060-1 (10 kA, pulse 8/20 μs), overvoltage protection has to be ensured by an integrated or
external overvoltage protection module.
Integrated overvoltage protection
An integrated overvoltage protection module is available for 2-wire HART as well as
PROFIBUS PA and FOUNDATION Fieldbus devices.
Product structure: Feature 610 "Accessory mounted", option NA "Overvoltage protection".
Technical data
Resistance per channel 2 * 0.5 Ω max
Threshold DC voltage 400 to 700 V
Threshold impulse voltage < 800 V
Capacitance at 1 MHz < 1.5 pF
Nominal arrest impulse voltage (8/20 μs) 10 kA
External overvoltage protection
HAW562 or HAW569 from Endress+Hauser are suited as external overvoltage protection.
For detailed information please refer to the following documents:
• HAW562: TI01012K
• HAW569: TI01013K
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