ISO 7494-2:2015 pdf download – Dentistry — Dental units —Part 2: Air, water, suction and waste water systems
ISO 7494-2:2015 pdf download – Dentistry — Dental units —Part 2: Air, water, suction and waste water systems.
4.1 ClassIfication of suction systems
According to ISO 10637: 1999, suction systems are classified to the type of suction as follows:
a) dry system;
I,) semi-dry system:
c) wet system.
4.2 Classification of suction air volume flow rate
According to ISO 10637:1999, suction systems are classified to the type ofair volume flow rate as follows:
a) type 1: high-volume suction system, suction system with an air intake of more than 250 NI/mm1) at the suctIon cannula connector;
h) type 2: medium-volume suction system, suction system with an air intake between 90 NI/mm and 250 NI/mini) at the suction cannula connector.
5.1 Requirements for supply connections
The manulacturers technical descriptioii shall include the configuration of the supply connections lot the dental unit. The specified configuration or the supply connections shall lie within a maximum area of 180 mm x 220 mm.
The manufacturer’s technical description shall include detailed information of the position and the dimensions of supply connections (see keys I to 5 in EjgureJ) for the dental unit in the dental treatment centre.
In the dental treatment centre, often a core hole in the floor with a diameter of 160mm is used. Therefore, it Is recommended to place the supply connections within this diameter.
An example of the configuration and the connection points is given in Figurel.
Dimensions for the connections for electricity and compressed air areas (see keys 4 and 5 in Figure 1) are given as maximum values.
Dimensions for plumbing holes (see keys 1, 2. and 3 in Figure 1) are given as minimum values. The diameters specify the free space required for tubes and hoses.
The holes without dimensions can be positioned anywhere inside the connection area.
Gas tubing. if required. shall not be located inside the areas specified in FIgure 1.
The location of other utility connections which are not indicated shall be specified by the manufacturer.
This test is in accordance with ZJ..Z.
5.2 Requirements for water and wastewater systems
NOTE A schematic diagram ol possible water and wastewater systems Is given as example In Figure A.l.
5.2.3 Backfiow prevention device for dental units connected to the external drinking water supply
Dental units directly connected to the external drinking water supply system and using this water as procedural water shall have a backf low prevention device at the connection point with the water supply or an air gap of not less than 20 mm.
This test is in accordance with Li.
The point where the cuspidor rinse water Is dispensed shall be at least 20 mm above the spill-over level of the cuspidor.
This test is in accordance with Li.
5.2.5 Water venturi
Waterventuri forsuction olsaliva and wastewatershall only be used ifan additional backflow prevention device is installed at the connection point of the water venturi device.
This test is In accordance with 72.
5.2.6 PartIcle filter
A dental unit directly connected to an external drinking water supply or a bottled water system shall have at least one particle filter with an effective mesh size not greater than 100 pm Installed at the incoming water connection point.
This test is in accordance with 7.6..
5.2.7 BacterIal lilter
If the dental unit water supply is equipped with a filter intended to restrict the passage of bacteria, the bacterial filter shall be rated to restrict the passage of contaminants larger than 0.22 pm. The dental unit manufacturer shall provide maintenance instructions and schedule for the bacterial filter.
This test is in accordance with 7.2.
5.2.8 Bottled water system supplying procedural water or solutIon
These systems shall either be completely separated from the external drinking water supply system or shall have a backflow prevention device at the connection point with the extenial drinking water supply system.
This test Is in accordance with 7.4.
The volume of the retraction of procedural water or solution shall not exceed 40 mm3 ( 0.04 ml).
This test is in accordance with L.
5.2.10 Water disinfection systems
These systems shall either be completely separated from the external drinking water supply system or shall have a backflow prevention device at the connection point with the external drinking water supply system.
The manufacturer shall supply Information about the water disinfection solution and instructions for use and maintenance.