6
4. Mounting of flow sensor
Before mounting the flow sensor, flush the system thoroughly and remove pro-
tection plugs/plastic membranes from the flow sensor. Correct flow sensor position
(flow or return pipe) appears from the front label placed on the MULTICAL® 601. The
flow direction is indicated by an arrow on the side of the flow sensor.
Glands and gaskets must be mounted as shown on the above drawing.
Straight inlet: ULTRAFLOW® requires neither straight inlet nor outlet to meet the
Measuring Instruments Directive (MID) 2004/22/EEC, OIML R75:2002 and EN
1434:2007. Only in case of heavy flow disturbances before the meter will a straight
inlet section be necessary. We recommend to follow the guidelines in CEN CR
13582.
To prevent cavitation, the operating pressure at the ULTRAFLOW® must be min. 1.5
bar at qp and min. 2.5 bar at qs. This applies to temperatures up to approx. 80°C.
ULTRAFLOW® must not be exposed to pressures below ambient pressure (vacuum).
Tightening approx. 4 Nm
Gasket
Gasket
A Recommended position of flow meter
B Recommended position of flow meter
C Unacceptable position due to risk of
air build-up
D Acceptable in closed systems.
Unacceptable position in open
systems due to risk of air build-up
E A flow meter ought not to be placed
immediately after a valve, except from
closing valves (ball check valve type),
which must be completely open when
not used for closing
F Never place a flow meter on the inlet
side of a pump
G A flow meter ought not to be placed
after a double bend, in two levels.
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