Young Aspirated Radiation Shield Model 43502 - Manual (Page 3)

Page 2
43502-90(C)
INITIAL CHECKOUT
The mounting bracket attaches to a vertical mounting post up to 5 cm (2
in) in diameter. The mounting post should be of sufficient length to allow
the shield intake to be adjusted to the desired height above the ground.
Tighten the U-bolt sufficiently for a secure hold without distorting the
plastic v-block.
See the accompanying section view drawings for reference to names
and locations of shield components and position of sensor within the
shield. The tip of the sensor should be positioned 60mm (2.4 in) to
90mm (3.5 in) from the shield intake. The blower cover is hinged to
allow easy access for sensor installation and cable connections. Loosen
the captive screw in the blower cover to open.
The standard Model 43502 Aspirated Radiation Shield is supplied with
a mounting bushing which fits YOUNG sensors. An additional blank
bushing is also supplied which can be drilled to fit sensors up to 20 mm
(0.8 in.) diameter. YOUNG Temperature Probes and Relative Humidity/
Temperature Probes are supplied with a junction box and cable
bushing. The junction box provides terminals for cable connections and
properly positions the sensor within the shield assembly.
Temperature sensors from other suppliers can also be used with the
Model 41390 Junction Box, which is available separately. It can be
drilled to fit sensor diameters up to 10 mm (0.4 in). For the sensor to
be properly positioned when the junction box is placed in the shield,
mount the sensor so its tip projects approximately 60 mm (2.4 in.)
beyond the end of the junction box. For temperature probes too long
to meet this requirement, use the optional Model 43476 Extender Tube
to increase the distance between the shield assembly and the blower
assembly. When installing the shield assembly in the blower assembly
hand tighten only being very careful to avoid cross-threading or over
tightening.
CONNECTIONS
With the blower cover open connect blower power (12-14 VDC unless
otherwise noted) to the terminals on the underside of the cover.
Terminal designations positive (POS), negative (NEG), and optional
tachometer (TACH), are marked on the printed circuit board. Blower
power is normally provided by the plug-in power supply adapter
included. BE SURE TO OBSERVE CORRECT POLARITY. Red is
positive, black is negative. The blower motor draws approximately
420mA-480mA. Use sufficiently heavy gauge wire between the power
supply adapter and the blower motor terminals to avoid significant
voltage drop. Clamp the blower power cable with the cable clamp
provided at the edge of the printed circuit card. When tying the cable
to the mounting structure provide a sufficient loop in the cable to allow
the blower cover to be opened and closed easily. Transient protection is
provided on the printed circuit card and in the blower motor.
Unthread and remove the cover from the sensor junction box. Insert
the sensor cable through the packing nut in the side of the junction box.
Attach sensor conductors to the appropriate terminals on the circuit
card inside and replace the junction box cover. The sensor cable exits
the side of the blower housing at the notches provided using the black
grommet to provide a seal. Clamp the cable to the lower flange of the
housing to keep it in proper position when the cover is closed.
MAINTENANCE
Depending on conditions, the blower should provide trouble-free
operation for several years. It is designed for continuous duty life of
80,000 hours at 25 C°. Blower life is somewhat reduced at higher
temperature but it will perform satisfactorily at temperatures as high as
70 C°. The blower assembly is easily replaced if necessary. Remove
the printed circuit card from the blower cover and unsolder the blower
leads. Loosen the two screws inside the blower cover which secure the
inside chamber and blower to the outside cover. Install the replacement
blower in the exact same orientation (with the blower exhaust opposite
the printed circuit card). Re-solder the blower leads to the printed circuit
card. Be sure to observe correct polarity when reconnecting the blower
leads (red – POS, black - NEG).
Inspect and clean the shield at regular intervals to maintain optimum
performance. When the shield becomes dirty wash it thoroughly inside
and out with mild soap and warm water. If necessary, use alcohol to
remove any oil film. Do not use any other type of solvent.
Check the mounting bolt and cable clamps periodically to for possible
loosening from vibration.
WARRANTY
This product is warranted to be free of defects in materials and construction
for a period of 12 months from date of initial purchase. Liability is limited
to repair or replacement of defective item. A copy of the warranty policy
may be obtained from R. M. Young Company.
CE COMPLIANCE
This product has been tested and shown to comply with European CE
requirements for the EMC Directive (see Declaration of Conformity
below). Please note that shielded cable must be used.
Declaration of Conformity
R. M. Young Company
2801 Aero Park Drive
Traverse City, MI 49686 USA
Model 43502 Compact Aspirated Radiation Shield.
The undersigned hereby declares on behalf of R. M.
Young Company that the above-referenced product, to
which this declaration relates, is in conformity with the
provisions of:
Council Directive 2004/108/EC (December 15, 2004)
on Electromagnetic Compatibility
David Poinsett
R&D Manager