WirelessHART Fieldgate SWG70, Operating Instructions Manual

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WirelessHART Fieldgate SWG70 4 Mechanical Installation
Hauser 17
4.2 Mounting the antenna
WARNING!
• When Fieldgate SWG70 is installed in Ex-Zone 2, the connection/disconnection of cables is
permitted only in the absence of any potentially explosive atmosphere or when the Fieldgate is
not connected to the power supply.
NOTE!
• Use only the antenna supplied or a remote antenna that conforms to the requirements in
Chapter 4.2.2.
• A failure to do this will void the radio approval and/or the Ex-certificate and the Fieldgate may
no longer be operated.
4.2.1 Mounting the antenna supplied
1 Before mounting the antenna supplied, make sure that the Fieldgate has been disconnected
from line power.
2 Firmly screw the antenna to the device's antenna terminal
(see Item 6 in Fig. 5.1 in Chapter 5.1).
4.2.2 Requirements for a remote antenna
WARNING!
• If Fieldgate SWG70 is to be operated in with a remote antenna installed in an explosion hazardous
area, then the antenna must possess the appropriate Ex-certification.
NOTE!
• The use of a remote antenna of a different type or that operates at a higher gain than specified in
the requirements below is subject to legal restrictions.
Only remote antennas that conform with the following requirements may be connected to the
Fieldgate.
• The antenna must comply with the laws for usage of 2.4 GHz equipment valid in the country
of installation
• Radio frequency energy ≤ 50 μ J
• Radio frequency power ≤ 2 W
• Antenna gain ≤ 20 dBi
• Maximum gain (EU) ≤ 4 dBi; Maximum gain (US & Canada) ≤ 2 dBi
The maximum gain must be less than or equal to the sum of the antenna gain and the losses of the
individual components. Note that the permitted maximum gain is dependent on the country of
installation.
Fig. 4-5: Calculating the maximum gain of a remote antenna
1 Antenna 4 Surge protector,


/4, without mechanical fixing
2 Coaxial adaptor 5 Fieldgate SWG70
3 RF coaxial cable with connectors
Gain (< Maximum Gain)
Antenna gain - Cable loss - Arrester loss - Cable loss
1
5
3
2
2
3
4