Intek 111D - Manual (Page 8)

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MAN114 REV C.wpd
the flow sporadic and difficult to measure. Control valves should be placed down stream of
the sensor.
The ideal installation will provide the sensor with well established smooth flow, uniform
system temperature and consistent fluid media.
2. Intrusive Probes —
.
IMPORTANT: Recommended straight run for best accuracy is 20
diameters up stream and 10 diameters down stream.
The various probe transducers are mounted through a threaded collar (NPT/2I and NPT/I) or
flange (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. There are exceptions to this in certain
applications; see CUSTOM INFORMATION (SECTION 6) as it applies.
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
junction box that houses the terminal cable connection. If this occurs the transducer 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 ELECTRONICS
Various types of electronics housings are available. These include NEMA 4, laboratory bench type,
explosion proof, and panel mount enclosures as well as special models to meet customer requirements.
These come in different sizes to accommodate options and special features.
1. NEMA 4 — The standard industrial housing, this enclosure is watertight (non-submersible)
when the door is properly clamped shut. The housing should be mounted such that wire/cable
ports are located at the bottom of the housing, to reduce problems associated with water spray,
condensation and settling of dust and dirt. An all stainless steel version for corrosive
environments is also available.
2. NEMA 7 — For use in hazardous (class I) environments. The lid should be closed and all
bolts tightened before the unit is powered up. If a NEMA 7/NEMA 4 enclosure was ordered,
the unit will have a rubber gasket in a groove in the top of the enclosure base. Conduit seals
are frequently required, so applicable code requirements should be met when installing the
conduit into the box.