Pasco Scientific SF-9216, Инструкция по эксплуатации

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2
Variable Output Air Supply 012-02141H
®
Adjusting the Motor Speed (Air Flow)
Turn the control knob fully COUNTER-clockwise. After
switching on the motor, slowly turn the control knob
CLOCKWISE. The motor should begin running when the
pointer on the control knob is near the “2” position. If it
does not, then follow this procedure:
➤
CAUTION: When the case is opened, there will
be exposed high voltages. This unit should be
serviced or adjusted only by trained technicians.
➀
Remove the four screws which attach the control
panel to the main unit.
➁
On one end of the printed circuit board are two trim
potentiometers designated as TR1 and TR2 (See Fig-
ure 3).
➂
Set TR1 and TR2 to their mid position and turn the
power switch to “ON”.
➃
Set the speed control knob (P1) fully counter-clock-
wise (“1”) and turn TR1 clockwise until the motor just
begins to turn smoothly.
➄
Set the speed control knob fully clockwise (“6”) and
adjust TR2 until the motor runs at maximum speed.
➅
Replace the control panel.
Fuse Replacement
The fuse is a dual-element delay type. Replace with the
following fuse ratings:
For the 110V version use a 5A/117V fuse.
For the 220V version use a 2.5A/250V fuse.
Operating Two Air Tracks
➤
CAUTION:
For those using SF-9216 Air Supply with equip-
ment other than the PASCO Model SF- 9214
Precision Student Air Track: This air supply is
designed for use with equipment for which the total
area of air flow is at least 2.6 cm
2
(0.4 in
2
). (For air
tracks, this area is determined by multiplying the
number of air holes on the surface of the track by
the surface area per hole).
When used with equipment for which the air flow
orifice is less than this value, the rate of air flow is
insufficient to cool the air supply, and the supply
may overheat and be damaged.
You may remedy this problem either by hooking up
the air supply to additional equipment (to meet the
2.6 cm
2
or 0.4 in
2
requirement) or by bleeding the
air line at some point to increase the area of the
unrestricted air flow to an acceptable level.
Operating Two Air Tracks
Two air tracks may be operated on a single Air Supply by
using the optional ‘T’ and hose, Model SF-9217. The ‘T’
is inserted into the Air Supply and one hose is connected
to one of the outlets. Naturally, both air tracks must be
connected to maintain air pressure.
Specifications
➀
When connected to the SF-9214 Precision Air Track
(382 holes @ 1 mm (0.038 in) diameter each, total
hole area 300 mm
2
(0.433 in
2
), the volume and pres-
sure is sufficient to lift a glider with a 200 g load (set-
ting at 50% of full range).
➁
The input current at full speed is 2.2 Amps maximum.
➂
The sound output is typically 10 - 20 dB above ambi-
ent noise. The maximum sound output is low enough
to allow normal conversation to be heard when the
motor is on.
➃
The volume of air produced is 1.02 m
3
/min (36 ft
3
/
min) and the pressure is 867 Pascals (0.0867 N/cm
2
or
0.122 lbs/in
2
) or 6.5 mm Hg at full speed.