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82 LF-Series Flowmeters: Sensor/Transmitter Installation
CE Certification
C.2 CE compliance information
Micro Motion equipment bearing the CE mark has been successfully tested to the regulations of
Electro Magnetic Compatibility (EMC) directive 89/336/EEC, Low Voltage Directive 73/23/EEC,
and ATEX directive 94/9/EC. This section contains a brief overview of the installation requirements.
For complete information, refer to the installation instructions earlier in this manual, and to the
ATEX D-IS instructions, available on the Micro Motion web site.
Table C-1 Compliance requirements
Directive Applies to Requirement
Electro Magnetic
Compatibility
(EMC) Directive
89/336/EEC
All LF-Series
flowmeters
• The sensor mounting plate must be grounded to earth.
• The transmitter must be grounded to earth.
• For the cable used between the sensor and the transmitter:
- Micro Motion supplies high-quality cable that meets the specifications for
CE certification.
- If you provide your own signal cable, you should use a cable which is
overall completely shielded with a 100% shield.
- If “Circular” type connectors are used, they should be shielded with a
metal shield. If applicable, metal cable glands providing cable shield
clamping must be used.
- The cable shield should be terminated to earth ground.
Low Voltage
Directive
73/23/EEC
All LF-Series
transmitters that use
AC power
• A user-supplied switch must be installed in the power supply line in close
proximity to the transmitter.
ATEX Directive
94/9/EC
Transmitter models
LFT(1/3/4/6/7)**L****
• When cable entries are used, they shall conform to clause 7.2.6 of
EN 50021.
• In an ambient temperature of less than –20 °C, suitable cable and cable
entries or conduit entries for this condition shall be used.
• A type of protection of at least IP 54 according to EN 60529 will be
achieved only when cable and conduit entries providing IP 54 according
to EN 60529 are used.
Transmitter models
LFT(6/7)**L****
• The cover of the terminal compartment containing terminals 1–6 may be
removed for short periods when the apparatus is in service to permit
checking or adjustment of energized energy-limited circuits.
Transmitter models
LFT(2/5)**L****
• When multiple transmitters are stacked on a single DIN rail and the
ambient temperature is above 45 °C, the units must be spaced at least
10 mm apart.
Sensor models
LF(2/3/4)*******L*****
(all sensors)
• When the temperature under rated conditions is higher than 70 °C at
the cable or conduit entry point, or 80 °C at the branching point of
the conductors, the temperature rating of the cable used between the
sensor and the transmitter shall be higher than the actually measured
temperature values.
• Provisions shall be made to prevent the rated voltage being exceeded by
transient disturbances of more than 40%.