Intek 100FS - Manual (Page 8)

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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 (4X) for corrosive
environments is also available.
2. NEMA 7 For use in hazardous (class I) environments. The lid should b e 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.
The electronics housing should be installed keeping in mind the length and routing of the transducer
cable. Standard cable length is six feet but it can be specified up to 200 feet. If the cable length is
changed (a portion cut off or additional cable spliced on), there may be a shift in the set point due to the
change in cable resistance. The size of this effect depends on the amount of change. Follow instructions
for adjusting the trip level in SECTION 3.
Unless otherwise specified, normal ambient environment for the electronics is 40-120°F. Recommended
maximum temperature is 135°F.
2.3 ELECTRICAL CONNECTIONS
1. Transducer Cable The standard transducer cable is 22 or 24 gauge, multi-conductor (6),
shielded cable with a PVC jacket. Connect the transducer cable to the electronics (and
transducer junction box if supplied) following the wire color codes shown on the wiring
diagram (Figure 1). Make sure all connections are tight. If the unit does not operate properly
after installation is completed, check these connections again.
2. Power The input power requirement is listed on the tag on the electronics e nclosure and
is shown on the input power connector; make sure the input power source is compatible. The
standard power requirement is 120 Vac, 60 Hz, ½ A, single phase. (For units going to Europe,
the standard is 220 Vac, 50 Hz, ½ A, single phase.) Power connections are as shown in
Figure 1.
. CAUTION: Never make or break transducer cable connections with
the electronics powered up (unless instructed by factory to do so).
As a general rule, if the flow is to be shut off or the flow line empty for long periods of time,
power to the unit should also be turned off. An on/off switch, provided by the customer, is
recommended for all industrial installations.
3. Output The relay connection s are made to the small switch board terminals. If the
instrument was ordered with two (2) relays, be sure to note which one will be used for low
flow and which one will be used for high flow detection.