ABB AquaMaster 3 User Manual

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AquaMaster 3Electromagnetic flowmeter 2 Mechanical InstallationUser Guide OI/FET2XX–EN Rev. E 132.4 GSM-equipped Transmitters2.4.1 GSM Antenna InstallationBefore deciding on an antenna mounting location, check that the local signal strength for the chosenmobile phone network is satisfactory. Use the GSM-equipped transmitter's integral signal strength testfacility to establish signal strength. Refer to Programming Guide (COI/FET2XX–EN), Section 5.If a GSM-equipped transmitter is not available, a standard mobile phone on the same network, positionedas close as possible to the intended location, gives a good indication of local signal strength. For GSM andlogger download services, a minimum of 2 visible signal strength indicator 'bars' are recommended. ForSMS text, a minimum of 1 visible signal strength indicator 'bar' is recommended.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, must be plastic – see Fig. 2.22 Ensure the antenna does not become submerged under water – see Fig. 2.22. 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 – see Fig. 2.23. Do not mount the antenna beneath a solid surface (for example, metal cover, floor / ceiling).Fig. 2.22 GSM Antenna InstallationRemote Antenna Integral Antenna50 mm (2.0 in.)50 mm (2.0 in.)