Zhejiang Sealand Technology Co.,Ltd.
3.2.1 Site selection
a) Sensor stays away from mechanical vibration source, for example, pump. Use flexible
pipe to connect meter with pipeline if inevitable. The housing must be standalone, out of
touch with any other device. There must be 3 times the size of sensor between 2 sensors
if there are many flow meters on the same pipeline, to avoid resonance.
b) Sensor stays away from industrial electromagnetic field, such as large generator and
transformer, better 5m at least. Such device influences the performance of drive coil and
pickoffs. Make sure magnetic field intensity less than 400A/m.
c) Do not install sensor on pipeline that easily expands with hot and contracts with cold,
especially near expansion joint, which leads to a worse stability.
d) Sensor should be installed on lower pipeline, to be easily full of fluid.
e) Make sure Ex-mark meet application requirements if in hazardous area.
f) Build a sunshade if the meter is under direct solar radiation.
g) Keep the meter from corrosive liquid.
3.2.2 Installation methods
The sensor can not be a support point of the whole pipeline; the pipeline should support itself.
Meanwhile, sensor should not be under overlarge tension stress during the connection,
since pipeline expansion will make this stress heavier.
There are 3 installation methods for different fluid, as follows.
Liquid Gas Slurry
Pic. 3-1 Installation methods
a) For liquid, install the sensor downwards, to avoid air gathering in tubes.
b) For gas, install the sensor upwards, to avoid condensate gathering in tubes.
c) For slurry, install the sensor on vertical pipe, to avoid particle gathering in tubes.
3.2.3 Ground
Current signal from sensor is extremely weak, only several millivolt even when full range;
thus, sensor should be well grounded to filter other signals. There are 2 requirements as
follows.
a) The electric potential of ground terminal of sensor and transmitter should be the same
as that of fluid.
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