9VORTEK Doc.# VT5 OM 050499, Rel. 2.1
Chapter 2 Installation
lence and reverse flow. Accurate airflow measurement is impossible in these
locations.
Direction of Flow- VorTek airflow probe bars must be mounted so airflow direc-
tion corresponds to the direction indicated by the flow arrow on the duct mounting
flange. Failure to mount the units properly will result in an erroneous or no flow
output. Probes can be mounted in any plane, vertical, or horizontal without effect-
ing the measurement quality. Sensors must be mounted straight in the airflow
stream.
Temperature- VorTek probes are designed for use in normal HVAC applications.
Continuous operation with temperatures over 200 degrees with standard materi-
als of construction is not recommended. Fume hood exhaust sensors with CPVC
construction have a limit of 180°. Close proximity to steam humidifiers and coils
is not recommended. Should a steam valve leak when air is not flowing, tempera-
tures in excess of the recommended maximum can occur. Moisture can also
cause incorrect readings.
Airborne Contaminants- Normal dirt and dust associated with air conditioning
applications will not effect sensor performance. The presence of agglomerating
or sticky particles can cause performance problems and should be avoided.
Should this occur, the probe bars can be removed for cleaning (see Appendix C).
Inspection- Carefully unpack and inspect the probes. If probes have been bent
or broken in shipment, advise Tek-Air immediately.
Installation- Probes are mounted across the duct and attach to the duct on both
sides. A 3 3/4" diameter hole should be located on the side of the duct where the
probe will be inserted. A 5/16" diameter hole is required in the duct wall on the
opposite side of the duct for probes longer than 12".
A sensor probe mounting plate is provided with a neoprene gasket and does not
require the application of special sealants. The flange plate should also not be
insulated to allow for easy removal if ever desired. See Diagram, Appenidix A,
Page A-2.
Large ducts need multiple Probe Bars so flow can be averaged. The bars should be
spaced out on the same “plane” of the duct so the sensors are located to pick up
the flow. Refer to the A
1
, A
2
, A
3,
A
4
(as required) dimensions on submittal schedule.
2.1.2 Fan Inlet- Mounted Probes
(refer to drawings on pages A-5 thru A-10 in Appendix A)
General- The VT-7000 Series Vortek Fan Inlet Probes are in pairs of bars for
each inlet. For single-inlet fans, one pair is provided. For double-inlet fans, two
pairs are provided. One Transmitter serves all bars in the one or two-pair set. On
bars sized for fan inlet diameters of 24" I.D. or less, the bar electronics are
mounted in an enclosure which mounts separately from the bars and is perma-
nently connected to the bars via flexible non-metallic conduit. On bars sized for
fan inlet diameters greater than 24" I.D., the bar electronics are housed in enclo-
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