Manual Use and Maintenance ALSIDENT SYSTEM 75

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Dortha Lane
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1 Manual Use and Maintenance ALSIDENT SYSTEM 75

2 Use and maintenance ALSIDENT SYSTEM 75 System 75 is intended for air volumes between 80 and 180 m 3 /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 depending 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, hospitals, 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 therefore 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 version, 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 conductive 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 commonly used cleaning materials and cleaning spirits.

The small finger screws must point forward and the damper wing to the right (see assembling the suction arm).

3 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 separately. 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 greasing 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).

4 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 weakened. 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 and 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 conductive properties. When delivered the socket pipe of the arm is provided with a wire prepared for EX-areas. In EXareas, it is important to balance the potential of the suction arm with the rest of the ventilation system 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 enclosed 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.

5 Positioning the hood OPTIMAL POSITION OF VARIOUS HOODS ALSIDENT SYSTEM 75 There are basically 3 ways to place the hood. The various positions influence the suction efficiency, 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 disturbing 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) 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. Ill. 02 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. Ill. 03 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 Alsident System reserve the right to make changes in this brochure to technical data, construction, materials, equipment, and appearance. The illustrations and pictures in this brochure do not necessarily represent the true appearance of the products and are for the purpose of description only. Alsident System make reservations regarding misprints

ALSIDENT SYSTEM 75. Easily positioned all-round fume extraction arm

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