2.3
Installation
2.3.1 Electronics
The instrument is rated for use in Class I, Division 1 and
Class I, Division 2 areas. The enclosure is also rated
NEMA 4X. Remote electronics (optional) should be
installed in an easy to access location within 500 feet
(150 meters) of the sensor. The electronics should not be
installed in areas where ambient temperature exceeds
+175° F (+80° C). If ambient temperature is between
-22° to -65° F (-30° to -54° C), the unit will operate but
the display will not be readable.
Provide watertight seals for all wiring entrances in the
enclosure to maintain the NEMA 4X rating. Use appropri-
ate NEC section when installing the instrument.
NOTE: A switch or circuit breaker should be installed in close prox-
imity to the equipment and within easy reach of the operator.
It should be marked as the disconnecting device for the
equipment.
2.3.2 Probe/Flow Body
Pipe
centerline
1" (25 mm)
Proper installation of the probe in the pipe or duct is
essential for accurate air or gas flow measurement. Normal
procedures for installing any type of flow element should
be followed. See Appendix for additional information on
probe location.
A flow arrow is etched on the sides of the probe to desig-
nate flow direction. The instrument is calibrated with the
flow in this direction. Ensure that the flow arrow is aligned
in the direction of flow. The instrument is unable to recog-
nize flow direction if inserted with the flow arrow in the
wrong direction.
It is generally recommended that the sensor be located in
the center of the pipe. This location provides less sensitivity
to changes in flow profile. Sensors mounted through com-
pression fittings have the ability to field adjust the sensor
to the desired location by using the dimensions as shown
in Figure 3.
It may be necessary to rotate the head of the instrument to
view the display while maintaining the proper flow orien-
tation. This is accomplished by loosening the set screw on
the bottom of the housing, rotating the enclosure to the
desired position and re-tightening the set screw. The second
set screw is a stop to prevent over rotating the enclosure.
See figure 4.
Figure 3
Probe Installation into Pipe or Duct
Using a Compression Fitting
Figure 4
54-631 Thermatel Model TA2 Transmitter
7
MAGNETROL [ MAGNETROL INTERNATIONAL, INC. ]
