Gsm-Equipped Transmitters; Gsm Antenna Installation - ABB AquaMaster 3 FET200 User Manual

AquaMaster 3 FET200
Electromagnetic flowmeter Transmitter

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. 2.14, page 11

Ensure the antenna does not become submerged under water – see Fig. 2.14, page 11.

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. 2.15, page 11.

Do not mount the antenna beneath a solid surface (for example, metal cover, floor / ceiling).
10
2 Mechanical Installation
OI/FET200–EN Rev. I