Endress+Hauser Micropilot FMR51 Operator's manual

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Special documentation
Micropilot FMR51, FMR57
Horn protection
For 80 mm (3") and 100 mm (4") horn antenna
SD01084F/00/EN/01.12
71212877

Safety instructions Micropilot FMR51, FMR57
2
1 Safety instructions
1.1 Designated use
The horn protection is a retrofitting part for Micropilot FMR51 and FMR57 level
measurement devices.
1.2 Installation and commissioning
1.2.1 Authorised personnel
All operations described in this mounting instructions manual must be carried out only
by trained specialist personnel authorised by the operator. During work on and with the
device the required personal protection equipment must always be worn.
1.2.2 Warning about misuse
Inappropriate or incorrect use of the instrument can give rise to application-specific
hazards, e.g. vessel overfill or damage to system components through incorrect
mounting or adjustment.
1.3 Operational safety
1.3.1 General safety instructions
The safety information in the operating instructions of the respective sensor must be
observed.
1.3.2 Hazardous areas
• in gas explosion hazardous areas
• in dust explosion hazardous areas (apparatus group IIIC)
NOTICE
Danger of explosion
‣In gas explosion hazardous areas: Avoid electrostatic charging (e.g. through friction,
cleaning, maintenance, strong medium flow).

Micropilot FMR51, FMR57 Product description
3
2 Product description
2.1 Configuration
The scope of delivery encompasses:
• Horn protection
• Hexagon screws M4
– 6 pcs. with antenna diameter 75 mm (2.95 in)
– 8 pcs. with antenna diameter 95 mm (3.74 in)
• Holding ring
• Contact ring
• O-ring seal
• Flat seal
• Documentation: this mounting instructions
2.2 Principle of operation
The horn protection is suitable for Micropilot FMR51/FMR57 level measurement
devices in applications with strong buildup and condensation inside the horn antenna.
Thanks to seals on the horn protection and antenna socket, moisture penetration can
be prevented. The contact ring provides an electrical connection between holding ring
and horn antenna.
When using the horn protection, it is not possible to apply purge air through the air
purge connection of the FMR57 as the antenna is sealed by the protection.

Mounting Micropilot FMR51, FMR57
4
3 Mounting
3.1 Mounting preparations
The following tools are necessary for mounting: Hexagon spanner size 3
3.2 Mounting steps
1 2 3456 7 8
A0019145
 1 Mounting horn protection
1 Flat seal
2 Lock washer
3 Screws, antenna socket
4 Holding ring
5 Contact ring
6 O-ring seal
7 Horn protection
8 Screws, horn protection
1. Loosen the screws (3) on the antenna socket and remove horn antenne.
2. Shift O-ring seal (6), contack ring (5) and holding ring (4) onto the antenna cone.
3. Plug horn protection (7) onto the antenna opening and direct the holes to the
holding ring (4).
4. Tighten the screws (8) crosswise until the horn protection (7) and holding ring (4)
are assembled.
5. Insert flat seal (1) between horn antenna and antenna socket.
6. Retighten the horn antenna with screws (3) to the antenna socket; Max. torque
2.5 Nm (1.844 lbf ft).

Micropilot FMR51, FMR57 Appendix
5
4 Appendix
4.1 Technical data
4.1.1 Materials
Horn protection PTFE
Screws 316L
Holding ring 316L
Contact ring 316L
O-ring seal Silicone
Flat seal PTFE
4.1.2 Process conditions
Vessel pressure max. 0.5 bar (7.252 psi)
Process temperature max. 130 °C (266 °F)
4.2 Dimensions
4.2.1 Horn protection for horn antenna 80 mm (3 in) 1)
237 (9.33)
³DN100 mm (in)
ø96 (3.78)
ød
A0019143
 2 Horn protection for horn antenna 80 mm (3")
1) Associated version of FMR51/FMR57: feature 070 "Antenna", option BC "Horn 80mm/3in"

Appendix Micropilot FMR51, FMR57
6
4.2.2 Horn protection for horn antenna 100 mm (4 in) 2)
450 (17.72)
ø116 (4.57)
mm (in)
ød
³DN150
A0019144
 3 Horn protection for horn antenna 100 mm (4")
4.3 Ordering information
Antenna size Order code of horn protection
80mm / 3" 71105890
100mm / 4" 71105889
2) Associated version of FMR51/FMR57: feature 070 "Antenna", option BD "Horn 100mm/4in"

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*71212877*
71212877