User's Manual
Table Of Contents
- Table of contents
- Important document information
- Function and system design
- Input
- Output
- Power supply
- Performance characteristics
- Installation
- Environment
- Process
- Mechanical construction
- Operability
- Certificates and approvals
- CE mark
- C-Tick symbol
- Ex approval
- Dual seal according to ANSI/ISA 12.27.01
- Functional Safety
- Sanitary compatibility
- AD2000
- Pressure Equipment Directive
- Marine certificate (in preparation)
- Radio standard EN302729-1/2
- Radio standard EN302372-1/2
- FCC / Industry Canada
- CRN approval
- Track record
- Other standards and guidelines
- Ordering information
- Accessories
- Documentation
- Registered trademarks
- Patents
DRAFT
Micropilot FMR51, FMR52
Endress+Hauser V. 1, Rev. 8, 4-10-2012 31
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 ms), 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 ms)
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