Page 14
3.2.6
Installing Grounding Rings
Gaskets (4 pl)
5 DIA
*
10 DIA
Grounding Rings (2pl)
* Additional straight run may be required upstream of the upstream grounding ring based on
the nature of the upstream obstruction. Refer to the chart in Section 3.1 on page 11 of this
manual to determine how much straight run is required.
Grounding rings are used to suppress electrical interference at the installation location for
electromagnetic flow meters. They are provided in pairs and are installed upstream and downstream
of the flow meter. The use of grounding rings significantly reduces electrical noise and may be
necessary for proper operation of flow meters installed in lined or non-conductive pipes.
Installation Instructions
1.
Install the rings upstream and downstream of the meter as shown above.
(Please note that the straight run requirements shown above are only for locating the
grounding rings with respect to the ISM 5.0 flow meter. The complete straight run
requirements for this meter are found in Section 3.1 on page 11 of this manual.)
2.
Install each grounding ring sandwiched between (2) ANSI Class 150 flanges and (2)
gaskets.
3.
Center each gasket on the grounding ring surface. Do not allow the gasket to protrude
into the flow stream.
4.
Use the torque specifications provided with the gaskets when tightening the flange
bolts.
5.
Wire the two grounding rings together as shown and connect them to the flow meter
earth wire. Connect this to a known good earth connection. See Section 3.2.5 on
page 21 of this manual for additional information on identifying an acceptable earth
connection.
