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If heavy vibrations can occur in the pipe work caused perhaps by resonance from pumps, or
a pulsating pressure in connection with, for example, a homogenizer or a positive displace-
ment pump, then vibration damping is required, or the transmitter should be mounted some-
where else where there is less variation in pressure.
If the liquid contains air, an air eliminator should be mounted before the Flow Transmitter.
The transmitter can be mounted both horizontally and vertically. No air must be trapped in the
meter head. The positive flow direction is indicated by an arrow on the meterhead.
Vertical mounting
With vertical mounting, upward flow is recommended. The reason for this is that any air within
the liquid will easily follow the liquid in its upward direction, which would not be the case with
downward liquid flow. With horizontal mounting, orientation as shown on the left is recom-
mended. Mounting the meter as shown in the figure to the right would mean that one of the
electrodes would be positioned at the top of the meter tube, and any air bubbles could cause
the electrode to loose contact with the liquid.
To create the best conditions for precise metering, and to maximise the lifetime of the trans-
mitter, a straight pipe run of at least three times the pipe work diameter should be mounted
upstream and downstream of the transmitter. This is especially important when running at
high temperature and high flow rate, since the risk of cavitation is increased with turbulent
flow.
When selecting the location of the transmitter it must be ensured that the ambient tempera-
ture is within the specified limits. Finally, the transmitter should be installed such that the elec-
tronic module and the terminal box can be fitted and dismantled in situ.
Note:
The clamp connections must be loosened completely before the transmitter is
rotated. Otherwise the meterhead may be fatally damaged.
Precautions must be taken to ensure that neither the electronic module, nor the meterhead,
nor the terminal box is exposed to moisture, when the transmitter is dismantled. To prevent
moisture, the cables must be mounted correctly in the glands. The electronic module and the
terminal box must be carefully mounted with all screws tightened.
The Flow Transmitter supply should always be connected, as heat developed in the elec-
tronic module prevents any condensation, which could damage the transmitter. The transmit-
ter should therefore be powered up as soon as possible after mounting.
Manual
Horizontal mounting
(seen from one side)
Flow Transmitter, PD 340
502 010 05
551 103 01
19/55
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