PCI OAFE-1550, Руководство по эксплуатации и техническому обслуживанию

Страница: 8 / 36

OAFE-1550 Operation & Maintenance Manual
Paragon Controls Incorporated 4 Revision Level 000
2.2. INSTALLATION GUIDELINES FOR DUCTED APPLICATIONS
The station may be installed in any duct configuration. However, the accuracy of the installation is
dependent on the flow conditions in the duct. The minimum installation requirements based upon a
uniform velocity profile approaching the duct disturbance for flow rates less than 2,500 fpm are shown
below. These are not ideal locations. It is always best to locate the station as far as possible from all
duct disturbances, with upstream disturbances being the most critical consideration.
OPPOSED BLADE DAMPERS
2D
ELBOWS
3D
FLOW
D
FLOW
2D
FLOW
D/4
FLOW
D/6
FLOW
FLOW
15° MAX
TRANSITIONS
D/6
2D
4D
FLOW
D/2
FLOW
DUCT TAKE-OFFS
FLOW
D
Notes:
Rectangular Ducts:
D =

HW
4
H = Duct height W = Duct width
2.3. MAINTENANCE
Since the sensing elements have no moving parts, only periodic cleaning may be required. The sensing
elements should be inspected for fouling of the sensing holes as part of an annual preventative
maintenance program. Installations having viscous airborne particles may require more frequent
inspection. If the sensing holes on the elements have become fouled or plugged, the following
procedure is recommended.
Caution, all instruments must be isolated (removed) from the sensing
lines prior to performing the following cleaning procedure.
-
Backpurging:
Connect clean/dry compressed air, set at a maximum pressure of 25 psi, to the
output pressure ports (total and/or static) of the sensing element being cleaned. While
purging the sensing element, wipe the surface of the cylinder with a cloth or brush to loosen
and remove all contaminant buildup.
-
Cleaning:
In applications where the sensing elements are subject to viscous contaminants it
is recommended that the surface be washed with a cleaning agent. The cleaning agent used
must be suitable for use on the type of material the sensing element is constructed of (i.e.
aluminum, stainless steel, etc.)
2.4. SITE STORAGE, HANDLING, AND SPARE PARTS
The sensing elements must be stored indoors, in the original shipping package, and in a dry place.
Failure to do so may result in internal blockage of averaging chambers due to dust migration and/or
insect infestation. Although the sensing elements are not fragile by design, care must be taken not to
damage or disfigure the cylinder surface when handling and installing. Particular attention must be
given to the surface areas in which sensing ports are located. The sensing elements come as a complete
fabricated assembly.
No spare parts are required.