Thermo Scientific Air Cadet Manual de usuario

OPERATING MANUAL

VACUUM/PRESSURE STATION

MODEL NO. 420-3901 (115V AC)

MODEL NO. 420-3902 (230V AC)

A-1299-5105

Edition 05

Thermo Fisher Scientific

1-800-637-3739 (U.S. and Canada only)

11 (847) 381-7050 (Outside U.S.) • (847) 381-7050 (Local)

www.thermoscientific.com • [email protected]

TABLE OF CONTENTS

Title Page

SAFETY PRECAUTIONS . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4

DESCRIPTION . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5

OPERATING INSTRUCTIONS . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 6

Grounding Instructions . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 6

SPECIFICATIONS . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .10

MAINTENANCE . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .11

REPLACEMENT PARTS LIST . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .14

PUMP HEAD REPLACEMENT PARTS LIST . . . . . . . . . . . . . . . . . . . . .14

SPECIAL APPLICATIONS . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .14

NOTE . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .14

WARRANTY . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .15

PRODUCT RETURN . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .15

TECHNICAL ASSISTANCE . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .15

VALOX - Reg TM General Electric Co.

DACRON - Reg TM E.I. DuPont de Nemours and Co.

Trademarks bearing the ® symbol in this publication

are registered in the U.S. and in other countries.

SAFETY PRECAUTIONS

DANGER: Improper use of grounding plug can result in a risk of electric

shock.

DANGER: Unplug power cord before any cleaning operation is started.

WARNING: Gas under pressure should not be used for supply as a

hazardous bursting condition could develop in the Pump

Head. Use only gases contained at atmospheric pressure.

CAUTION: Do not operate pump when pressure ports of both heads are

in a blocked condition.

CAUTION: Do not use metal fittings with any Air Cadet Pump.

DESCRIPTION

The Vacuum/Pressure Station is designed to provide a convenient,

portable source of regulated vacuum and/or pressure for bench-top

laboratory or commercial use. Each function is regulated independently by

clearly identified valves and the easy-to-read compound function gauge

eliminates the need for an elaborate plumbing network. The convoluted

diaphragm and the unique head cavity of the pump are designed to provide

extended diaphragm life by minimizing stress, wear and heat buildup. This

has been done while ensuring and optimizing pressure and vacuum

characteristics. The brushless pump motor is totally enclosed, thermally

protected and has sealed ball bearings. No regular maintenance of the

motor is required. A six foot long, three conductor power supply cord

is supplied with the unit and the 115V AC motor is a U.L. recognized

component.

Figure 1 shows the typical flow characteristics of the 115V station as

related to pressure and vacuum. The corresponding flow data for the 230V

station are 5/6 of the values shown in Figure 1. Also note that, even though

model 420-3902 is designed for 50 Hz applications, it can be run on 230V

AC, 60 Hz line current. In this condition, the flow data will equal that of the

420-3901 station but available torque will decrease. All units are intended

to be started without load (both ports open to atmosphere). If either a

vacuum or pressure exists, the pump may not start.

Always consider material compatibility before running any service through

the Vacuum/Pressure Station.

The Materials in contact with the service are as follows:

1) Pump — VALOX®(polyester), DACRON®and FKM rubber.

2) Manifold chamber and fittings — PVC, silicone, linear polyethylene

and stainless steel 303.

3) Pressure/Vacuum Gauge — Bronze tubing and brass socket.

OPERATING INSTRUCTIONS

The pump supplied with the Vacuum/Pressure Station must always be

plugged into a grounded outlet. Both models are supplied complete with a

grounded plug and an on-off rocker switch.

Grounding Instructions

This product should be grounded. In the event of an electrical short circuit,

grounding reduces the risk of electric shock by providing an escape wire

for the electric current. This product is equipped with a cord having a

grounding wire with an appropriate grounding plug. The plug must be

plugged into an outlet that is properly installed and grounded in accordance

with all local codes and ordinances.

DANGER: Improper use of grounding plug can result in a risk of electric

shock.

FIGURE 1

If repair or replacement of the cord or plug is necessary, do not connect the

grounding wire to either flat blade terminal. The wire with insulation having

an outer surface that is green with or without yellow stripes is the ground-

ing wire. Check with a qualified electrician or serviceman if the grounding

instructions are not completely understood, or if in doubt as to whether the

product is properly grounded. Do not modify the plug provided; if it will not

fit the outlet, have the proper outlet installed by a qualified electrician.

This product is for use on a nominal 120 volt circuit for Model 420-3901 and

a 230 volt, 50 cycle circuit for Model 420-3902. Model 420-3901 has a

grounding plug that looks like the adapter illustrated in Figure 2(A). A tem-

porary adapter, which looks like the adapter illustrated in Figure 2(B) and

Figure 2(B) if a properly grounded outlet is not available. The temporary

adapter should be used only until a properly grounded outlet, Figure 2(A),

can be installed by a qualified electrician. The green colored rigid ear, lug

or the like extending from the adapter must be connected to a permanent

ground such as a properly grounded outlet box cover. Whenever the

adapter is used, it must be held in place by a metal screw.

FIGURE 2

GROUNDED OUTLET ADAPTER

METAL

SCREW

COVER OF GROUNDED

OUTLET BOX

GROUNDING PIN

ADAPTER

GROUNDING

MEANS

(A) (B)

(C)

Extension Cords

Use only a 3-wire extension cord that has a 3-blade grounding plug and a

3-slot receptacle that will accept the plug on the product. Make sure your

extension cord is in good condition. When using an extension cord, be sure

to use one heavy enough to carry the current your product will draw. An

undersized cord will cause a drop in line voltage resulting in loss of power

and overheating. The correct size to use depending on cord length and

nameplate ampere rating is No. 18 AWG, 3 conductor up to 100 feet. If in

doubt, use the next heavier gage. NOTE: The smaller the gage number, the

heavier the cord.

Operation (see Figure 3)

For pressure delivery, the manifold port marked “TO PUMP” should be

connected via the 9 inch long tube to the pump port marked “FOR PRES-

SURE,” with pressure regulated by the valve marked “PRESSURE

ADJUST.” The “INPUT/OUTPUT” port should be connected to suitable

containers for receiving pressurized air or gas. If a medium other than

ambient air is to be pressurized, the source of supply should be connect-

ed to the pump inlet port marked “FOR VACUUM.”

WARNING: Gas under pressure should not be used for supply as a haz-

ardous bursting condition could develop in the pump head.

Use only gases contained at atmospheric pressure.

CAUTION: Do not operate pump when pressure ports of both heads are

in a blocked condition.

To draw a regulated vacuum from a source, first, connect the source of

supply to the port marked “INPUT/OUTPUT” and then connect the “TO

PUMP” port to the pump inlet, marked “FOR VACUUM.” If the

Vacuum/Pressure Station was previously used for pressure delivery, be

sure all pressures are relieved before disconnecting tubing from the “FOR

PRESSURE” and/or the “INPUT/OUTPUT” port(s). This can be done best

by stopping the pump and gradually relieving pressure by turning the

“PRESSURE ADJUST” valve screw counterclockwise until the gauge

reads zero.

The motor is supplied with an internal thermal overload switch which may

trip if something happens to the pump. If this should occur, check the pump

to ensure that everything is normal. Allow motor to cool for approximately

30 minutes, then restart. If overload trips again, return the complete unit to

your dealer for repair. Refer to return policy in back of manual.

DANGER: Unplug power cord before any cleaning operation is started.

INPUT/

OUTPUT

AUXILIARY

TO PUMP

PRESSURE

ADJUST

VACUUM

ADJUST

FIGURE 3

PRESSURE VACUUM

VACUUM PRESSURE STATION

When the pump is not in use, store in a clean, dry area. If ports on pump

are open, cover to keep dust and dirt from entering. Wipe power cord down

with dry towel and inspect for cracks in insulation after each use. Have

cord repaired, if found defective, prior to reusing.

SPECIFICATIONS

MODEL NO. 420-3901 420-3902

Power 100–115 +/- 10%, V AC, 60 Hz, 1.5A 230 +/- 10%, V AC, 50 Hz, 0.75A

Air Capacity (Vac.) 1050 Cu. Inch per min 900 Cu. Inch per min

Air Capacity (Press.) 900 Cu. Inch per min 750 Cu. Inch per min

Max. Pressure 18/21 psig* 18/21 psig*

Max. Suction 23 Inches Hg** 23 Inches Hg**

Housing Dimensions 9 in L x 8 in W x 8.75 in H 9 in L x 8 in W x 8.75 in H

Air capacity will depend on the application. Refer to Figure 1. It indicates the approximate flow with various input

and output conditions.

*Recommended Pressure: 18 psig Max.; continuous duty / 21 psig Max.; intermittent duty

**Recommended Vacuum: 23 in Hg continuous or intermittent

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