AQUA M A STE R4
| EL EC T R O M AG N E T I C FLO W M E T ER T R A N SM I T T ER | O I/FE T4 0 0 - EN R E V. D
19
Antenna installation – FET45X
Before deciding on an antenna mounting location, check that
the local signal strength for the chosen mobile phone network
is satisfactory. Use the transmitter and Velox app to establish
the signal strength (refer to
).
The minimum signal strength for the remote communication is
-37 dB corresponding to 26% as stated above. The
recommended signal strength is -73 dB or 52%.
If a transmitter is not available, a standard mobile phone on the
same network, positioned as close as possible to the intended
location, gives a good indication of local signal strength.
IMPORTANT (NOTE)
The signal strength mentioned above are applicable
for both internal or external antenna of the
transmitter.
The following must also be observed when deciding on the
antenna mounting location:
• For best results, mount the antenna as high above local
ground level as possible.
• If the antenna must be mounted below ground, achieve
optimum results by ensuring:
– there is a strong mobile phone network signal at ground
level
– the antenna, mounted 50 mm (2 in.) below the chamber
cover, is plastic
• Ensure the antenna does not become submerged underwater.
• Metallic enclosures seriously degrade the signal. If an
enclosure is used it must be non-metallic.
• Do not mount the antenna closer than 50 mm (2 in.) to any
solid wall or surface
• Do not mount the antenna beneath a solid surface (for
example, metal cover, floor / ceiling).
Figure 24 3G/4G or NB-IoT antenna installation
50 mm (2.0 in.)
Remote Antenna
50 mm (2.0 in.)
Integral Antenna
>150 mm
(6.0 in.)
