Siemens SITRANS FUH1010, Product Instruction Manual, Page: 126 / 264

Functions
7.14 SONILOCATOR Operation
FUH1010 IP65 NEMA 4X Precision Volume
Operating Instructions, 01/2013, A5E32122003-AA
125
7.14 SONILOCATOR Operation
Introduction
Note
The Sonilocator function can only be invoked while flow meter is used as part of a Siemens
Leak Detection System.
In the event of a pipeline leak, a sudden drop in pressure occurs radiating a pressure wave
both upstream and downstream from that point at the speed of sound in the liquid. This drop
in pressure decreases the density of the liquid, which results in a sudden drop in the current
value of the liquid’s sonic propagation velocity (Vs). Vs is measured at each of the upstream
and downstream Site Stations (metering points) an average of ten times per second. The
decrease in Vs is detected and time stamped with the arrival of the pressure wave’s leading
edge. Since both Site Stations have synchronized time clocks, the relative arrival times of
the pressure waves at each Site Station is easily determined. The accuracy of the location
function is dependent on the resolution of time stamping and the sonic propagation velocity
of 1500 meters per second. The leak will be located /- 150 meters, providing that:
1.
The pressure wave table is able to travel the entire pipeline segment.
2. The magnitude of the pressure transient must be greater that the pressure fluctuations
during normal pipeline operation.
Setting [Sonilocate]
Note
The Sonilocator function is only operational with a Siemens Master Station and SITRANS F
1010 flow meter.
1. At the [Meter Type] menu, press the <Right Arrow> key and then <ENTER> to select the
desired Path (e.g., Dual Path Flow).
2. In the [Dual Path Flow] menu, press the <Down Arrow> key. Scroll to the [Operation
Adjust] menu cell. Press the <Right Arrow> to select it.
3. Press the <Down Arrow> key and scroll to the [SL Rate] menu cell.
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