alsident System 75 Use and Maintenance Manual

Brand: alsident

Model: System 75

Type: Use and Maintenance Manual

ALSIDENT

SYSTEM 75

Use and Maintenance

Manual

ALSIDENT SYSTEM A/S

Finlandsvej 10 · DK-8450 Hammel · CVR nr. 57867612 · Tlf.: +45 86 96 50 00 · Fax: +45 86 96 50 10

[email protected] · www.alsident.com

ALSIDENT

SYSTEM

System 75 is intended for air volumes between 80 and 180 m

/hour and available in the following

mounting versions:

 Table mounting (BM)

 Wall mounting (HM)

 Ceiling mounting (HMS)

The different mounting versions have various reaches in the recommended max working position.

The system 75 extraction arms are available with reaches between 550 mm and 1,990 mm de-

pending on mounting version.

System 75 comes in three different material versions:

Aluminium: Aluminium pipes with joints of polypropylene (PP).

This version is used in non-aggressive areas such as laboratories, hos-

pitals, schools and the pharmaceutical industry.

Chemical resistant: Pipes and joints of polypropylene (PP).

This version is suitable for aggressive areas, e.g. chemical industry.

Antistatic: Pipes and joints of conductive polypropylene (PP).

This version is suitable for ESD-areas and the soldering industry and for

exhaustion in EX-areas.

Cleaning of System 75

Polypropylene (PP) and PETG are not to be exposed to temperatures above 90°C and can there-

fore not be sterilized by autoclave. It is recommended to clean the parts in a general detergent or

another cleaning material. Polypropylene withstands almost all commonly used cleaning materials

and cleaning spirits.

Hoods:

The hoods for system 75 are available in two material versions. The majority of hoods are made of

transparent PETG (Polyethylene Terephthalate, Glycol-modified). In addition, there are three types

in anodized aluminium: suction pen, suction nozzle and 200 mm hood. The hood is also available

in a powder-coated version. All PETG hoods are delivered with a loose stub pipe of anodized

aluminium.

For System 75 Chemical resistant, the hoods are made of white polypropylene (PP). For this ver-

sion, the Ø200 hood is also available in a powder-coated version. Please notice that this hood is

not as resistant to chemical affect as the PP-hoods. All PP hoods are delivered with a loose stub

pipe in polypropylene (PP).

For System 75 Antistatic, most of the hoods are made of black conductive Polypropylene (PP). The

antistatic Ø200 mm metal hood is made of chromated aluminium. The stub pipes are made of con-

ductive polypropylene (PP), and all hoods are delivered with a loose stub pipe. When cleaning the

hoods, never expose them to temperatures beyond 90°C (194°F). The hoods withstand all com-

monly used cleaning materials and cleaning spirits.

Use and maintenance

ALSIDENT SYSTEM A/S

Finlandsvej 10 · DK-8450 Hammel · CVR nr. 57867612 · Tlf.: +45 86 96 50 00 · Fax: +45 86 96 50 10

[email protected] · www.alsident.com

Joint with built-in damper:

Where sanitary demands are strict, it is recommended to clean the joint with built-in damper at

least once every week.

If sterile conditions are demanded, the joint must be taken apart and the 2 parts cleaned sepa-

rately. In this case, please pay attention to the way the joint is assembled. The small finger screws

must point forward and the damper wing to the right (see assembling the suction arm). If the

damper joint is mounted the wrong way, so the damper wing is to the left, the joint will no longer be

airtight.

Pipes and joints:

Cleaning of the B-pipe (in connection with the joint with damper) is recommended at least once

every month.

Cleaning of the A-pipe is recommended at least once every quarter or every six months.

O-rings:

The O-rings for system 75 are made of white polyethylene (PE). It is very important to avoid greas-

ing of the O-ring with oils or fats reducing friction between the rings and the joints. Otherwise the

arm cannot keep its work position.

Work processes developing greasy substances that will deposit in the joints recommend a frequent

cleaning of the O-rings and contact faces. A thinner such as Acetone or the like can be used for

cleaning of the O-rings, and in order to do so, the joint has to be taken apart.

Assembling of the suction arm

After cleaning the suction arm it is important to reassemble it correctly. The “stops” on the socket

joint must fit together indicating that the suction arm is correctly placed in connection with spring

and socket pipe. Control correct reassembling by loosening the black finger screws on the socket

joint. The correctly assembled arm will then move upwards.

Remember to put on the small white Teflon washers before the finger screws on the sides of the

joint with damper.

When mounting the joint with damper on the suction arm, please be sure that the small finger

screws point forward and the damper wing to the right (see drawing).

ALSIDENT SYSTEM A/S

Finlandsvej 10 · DK-8450 Hammel · CVR nr. 57867612 · Tlf.: +45 86 96 50 00 · Fax: +45 86 96 50 10

[email protected] · www.alsident.com

Adjustment of internal springs:

By stationary positioning of the suction arm in the highest or lowest part of the working area, the

arm may rise. This happens when the spring in the socket joint is too tight for the position. This can

be corrected by mounting the arm at a lower point. If this is not feasible, the spring can be weak-

ened. In order to do so, the socket joint must be taken apart by screwing one of the finger screws

off the joint and pulling out the threaded stay. When the spring has been removed from the joint,

weaken it by pushing the “legs “ of the spring in

the winding direction.

However, if the arm is sinking from the wanted position, this could be due to greasing of the O-ring

with oils or fats causing loss of friction. In this case, the O-ring must be cleaned as described

above. Sometimes the spring can be weakened if the arm is positioned at the extremity of the work

area over a long period of time making the arm sink. In this case, the spring needs to be tightened

up by pulling the “legs” of the spring against

the winding direction.

On the figure below a spring is shown in three different positions: 1) a weakened spring, 2) a spring

in normal position and 3) a tightened spring. When the spring needs to be bent do it in a distance

app. ⅓ ·h from the winding. The angle, v, depends on the need for tightening/weakening, and it is

advisable to test one’s ground in small stages (i.e. 5° at a time).

The shown spring is made for use in

HM/HMS arms with three joints.

For all springs the following apply:

When weakening

a spring, bend the

legs in

the winding direction.

When tightening

a spring, bend the

legs against

the winding direction.

Gas springs:

Some of the arms 75-9065 and 75-9090 are equipped with external gas springs. The gas springs

are maintenance free, but should be cleaned regularly. The gas springs must not be retracted or

extended beyond there stroke in both directions nor be exposed to impacts. The gas springs must

not be used as handles, and non-axial (sideway) forces must be avoided. The gas springs are

considered wearing parts.

The antistatic suction arm

The arm is constructed of tubes and joints of conductive Polypropylene (PP), giving the arm con-

ductive properties.

When delivered the socket pipe of the arm is provided with a wire prepared for EX-areas. In EX-

areas, it is important to balance the potential of the suction arm with the rest of the ventilation sys-

tem and the earth wire must therefore be connected with the ventilating duct.

If the arm is to be mounted in an ESD-area, the pre-attached wire must be replaced by the en-

closed ESD-wire with a resistance of 1 MΩ. The ESD arm then must be earthed together with the

other equipment in order to give the suction arm the same potential as the rest of the area. This

prevents a strong discharge, which could damage the electronic equipment. We recommend that

an electrician with experience in ESD-areas earths the wire.

Since the resistance of 1 MΩ is very important in ESD-areas, please be careful not to break the

resistance.

ALSIDENT SYSTEM A/S

Finlandsvej 10 · DK-8450 Hammel · CVR nr. 57867612 · Tlf.: +45 86 96 50 00 · Fax: +45 86 96 50 10

[email protected] · www.alsident.com

OPTIMAL POSITION OF VARIOUS HOODS

ALSIDENT

SYSTEM 75

There are basically 3 ways to place the hood. The various positions influence the suction effi-

ciency, which also depends on the distance to the pollution source and the air volume.

Therefore, it is advisable to place the hood as close to the pollution source as possible without dis-

turbing the work process. It is also advisable to be sure that the damper is duly opened. The wing

for regulation of the damper is placed on the right side of the joint.

1) Vertically placed opening with the

hood on or close to the table

(ill. 01)

2) Hood placed behind the pollution source

with the opening making an angle

with the table

(ill. 02)

The above positions are the most effective ways

to place the hood.

3) Horizontally placed opening with the hood

placed above and possibly slightly behind

the pollution source

(ill. 03)

With this way of placing the hood, it is often

necessary to push the hood slightly behind

and raise it slightly higher above the pollution

source in order to avoid disturbance of the

work process. This position generally causes

a lower efficiency.

We refer to our capture efficiency report on the

various systems, which is available on demand.

Please contact

ALSIDENT

SYSTEM A/S

or download from www.alsident.com

Positioning the hood

Ill. 01

Ill. 02

Ill. 03

lsident® System reserve the right to make

changes in this brochure to technical data,

construction, materials, equipment, an

appearance. The illustrations and pictures in

this brochure do not necessarily represent the

true appearance of the products and are fo

the purpose of description only. Alsident

System make reservations regarding misprints

alsident System 75 Use and Maintenance Manual

Brand: alsident

Model: System 75

Type: Use and Maintenance Manual

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alsident System 75 Use and Maintenance Manual

alsident System 75 Use and Maintenance Manual

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