D
R
A
F
T
Micropilot FMR53, FMR54
Hauser
V. 1, Rev. 7, 26-10-2012
29
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
m
s), 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
W
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
m
s)
10 kA
External overvoltage protection
HAW562 or HAW569 from Hauser are suited as external overvoltage protection.
For detailed information please refer to the following documents:
• HAW562: TI01012K
• HAW569: TI01013K
