AquaMaster 3
Electromagnetic flowmeter
2 Mechanical Installation
User Guide OI/FET2XX–EN Rev. E
13
2.4 GSM-equipped Transmitters
2.4.1 GSM Antenna Installation
Before deciding on an antenna mounting location, check that the local signal strength for the chosen
mobile phone network is satisfactory. Use the GSM-equipped transmitter's integral signal strength test
facility 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, positioned
as close as possible to the intended location, gives a good indication of local signal strength. For GSM and
logger download services, a minimum of 2 visible signal strength indicator 'bars' are recommended. For
SMS 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 Installation
Remote Antenna
Integral Antenna
50 mm (2.0 in.)
50 mm (2.0 in.)
