Intek 111D - Manual (Page 9)

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MAN114 REV C.wpd
3. Laboratory — This table-top unit is NEMA 1 only; do not spill liquid on it or use in a wet
environment. This unit typically has a grounded power cord, and all transducer and output
connections are located on the back of the enclosure.
4. Panel Mount — For use in a control panel, mounted so the enclosure face is flush with the
panel surface. Most or all connections are made on the back of the enclosure. NEMA 1 only;
do not use in a wet environment.
The electronics housing should be installed keeping in mind the length and routing of the transducer
cable. Standard cable length is ten (10) feet but it can be specified up to 200 feet. If, after calibration
of the unit, the cable length is changed (a portion cut off or additional cable spliced on), there may be
a shift in the calibration due to the change in cable resistance. The size of this effect depends on the
amount of change. If a noticeable shift occurs, it may be calibrated out following the single point
calibration instructions in SECTION 4.2.
Unless otherwise specified, normal ambient environment for the electronics is 0-120°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.
In general the laboratory unit will have a plug-in connector for the transducer cable.
2. Power — The input power requirement is listed on the tag on the electronics enclosure and
is shown on the input power connector; make sure the input power source is compatible. The
standard power requirement is 115 Vac, 60 Hz, ½ A, single phase. (For units going to Europe,
the standard is 230 Vac, 50 Hz, ¼ A, single phase.) Power connections are as shown in Figure
1. Laboratory units sold in the U.S. have a power cord with grounded plug.
.
CAUTION: Never make or break transducer cable connections with
the electronics powered up (unless specifically 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 — Output connections are made to the output terminal as shown in Figure 1. If the
unit has a 4-20 mA output, the standard is an isolated 4-wire transmitter with the current loop
powered by the
Rheotherm electronics. Do not attempt to use with a system that also sources
the current unless the instrument was specifically ordered that way.