Intek 100CS - Manual (Page 7)

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The ideal installation will provide the sensor with well established smooth flow, uniform
system temperature and consistent fluid media.
2. Intrusive Probes
Straight run is not critical, but if trying to hold a precise set point, some straight run is
useful, such as 10 to 20 pipe diameters on the inlet and at least 6 diameters on the outlet.
The various probe transducers are mounted through a threaded collar (NPT/2I and NPT/I) or
flanged tee (BF/2I or BF/I). Other fittings and sensor designs are also available and are
discussed on the Custom Information page. Generally the probes are sized so the tips extend
½ to 1 inch beyond the pipe center line when properly installed. However, for larger pipes,
the probes may extend in
1 /
8
of a diameter from the wall.
Proper alignment of the sensor with flow is important; the flow direction is indicated on the
transducer tag and/or etched into the transducer. All dual probe transducers (NPT/2I, BF/2I)
are installed so that the two probes are side-by-side across the fluid stream. Never rotate the
electronics box. If this occurs the flow switch could be damaged and/or installed misaligned
with the flow direction.
For high temperature applications, the sensor and surrounding line should be well insulated.
Leave a portion of the transducer neck un-insulated to allow heat dissipation before reaching
the junction box.
2.2 ELECTRICAL CONNECTIONS (See Figure 1 on page 12)
The input power requirement is listed on the tag on the electronics enclosure; make sure the input power
source is compatible. The standard power requirement is 120 Vac, 60 Hz, single phase (220 Vac, 50
Hz and 24 Vdc are options).
Wire sizes no smaller than 24 gauge can be used for power. The electronics power ground is common
to the transducer casing. 14 gauge stranded wire is recommended for the relay contacts (10A resistive
at 120 Vac, 5 Amps resistive at 240 Vac).
The input power and relay connections are made as shown in Figure 1. Note the connector is removable
for easier insertion of the wires. Once all connections are made, firmly push the connector back onto
its base. Be sure the wires are stress relieved sufficiently to prevent an inadvertent disconnect.
The typical housing for a 100CS flow switch is a round explosion-proof enclosure. When ready for use,
the housing lid should be tightly screwed on. A gasket is included when rain tightness is required. Here
again, the lid should be on tight to make a good seal against the gasket.