dental compressor

Quality requirements for dental air

3.8 Dental air should be clean and dry in order to minimise the risk of

contamination of the system by micro-organisms, and to improve the

efficiency of the dental instruments. Wet and dirty air will eventually cause

corrosion and lead to damage of instruments.

3.9 The quality of the dental air should be the same as for medical air,

except that it is not necessary to achieve a dew-point of –40°C at atmospheric

pressure; a dew-point of –20°C is adequate.

3.10 The quality requirements for dental air are given in Table 1.

Table 1 Quality specification for dental air

Parameter Specification

Oxygen 20.9 ± 1.0%

Nitrogen 78.0% by inference

Particulate contamination Practically free from visible particles in a

75 litre sample

Water content equivalent to a dew-point of –20°C at

atmospheric pressure

CO < 5 ppm v/v

CO

2 < 500 ppm v/v

Oil content (droplet or mist) < 0.5 mg/m3

Odour none

Note: The odour threshold is approximately 0.3 mg/m3

Compressor lubrication

5.28 Oil-free compressors have been used successfully in dental surgeries,

and obviate the need for oil separators and filters. Care should, however, be

taken to ensure that PTFE rings and lubricating oils do not become excessively

hot. A temperature sensor may be fitted with suitable controls to cut off the

power supply in the event of excessive temperature.

Air treatment

5.29 Contaminants can enter the compressed air systems from three

sources: the atmosphere, the compressor, and the pipeline distribution system.

Each potential source must be taken into account when specifying the type

and location of air treatment equipment.

5.30 A 5 micron air intake filter is required to prevent blockage of internal

air/oil separators.

5.31 Water is always a contaminant in a compressed air system, regardless

of the type and location of the compressor plant, since the air drawn into the

compressor intake is never completely free of water vapour.

5.32 The reservoir should be coated internally to minimise rust production.

5.33 A water content not to exceed a dew-point of –20°C at atmospheric

pressure is recommended in order to avoid these problems.

5.34 This may be difficult to achieve in practice with a refrigerant dryer,

and therefore desiccant dryer should be used.

5.35 The dryer can be located either upstream or downstream of the air

receiver depending upon the design of the system.

5.36 For small installations, there may be advantages in locating the dryer

upstream of the receiver in order to ensure that the air receiver is not

contaminated with moist air and that the dry air from the receiver can be used

to regenerate the dryer.

5.37 If the dryer is located downstream of the receiver, the receiver acts

as a secondary after-cooler and also smooths out the pulsing effect of a

reciprocating pump. This may be appropriate to larger installations.

5.38 The dryer system should be fitted with a hygrometer to continuously

monitor the dryness of the compressed air and automatically shut down the

system in the event of excessive moisture.

5.39 An alarm should be installed to indicate high moisture content. For the

smaller system it may be more appropriate to alarm this condition rather than

automatically shutting down the system, which may be inconvenient. The dew

point may rise to a pressure dew-point of +3°C before the system should

alarm. Details of alarms are given in paragraphs 5.47–5.49.

5.40 A typical system with the dryer located upstream of the receiver is

shown in Figure 2.

A refrigerant dryer may be

appropriate in small installations, that

is, fewer than 2/3 chairs, provided

that the length of external pipeworkis negligible

Exceptional Performance: Permanent-Power-System Providing unrivalled performance, KAESER’s "Permanent Power System" (PPS) enables up to 90 percent compressed air availability. To regenerate the desiccant in the SECCOMAT dryer, the PPS uses a highly efficient process whereby fresh ambient air is drawn in and warmed via the compressor and then passed through the dryer. This technique has several key advantages: Firstly, the resulting internal cooling of the compressor block increases efficiency and service life. Secondly, the warmed air is perfect for purge air as it can carry far more moisture than cool air. This process is also much faster than conventional regeneration methods which use diverted compressed air that is cooled as a result of subsequent expansion. Consequently, the KAESER “Permanent Power System” significantly extends the compressed air system’s power phases and enables unprecedented compressed air availability.

Durable KAESER compressor block KAESER compressor blocks are made from materials of the highest quality. Produced in Coburg, Germany, each component is manufactured, inspected and assembled with meticulous care and precision. Together with KAESER's innovative "Permanent Power System", these durable compressors provide outstanding performance and unrivalled energy efficiency.

Replaceable Teflon seals Both piston rings and the guide ring for each piston are Teflon-coated to ensure maximum durability. Moreover, they are easy and inexpensive to replace should the need arise and, as a result, further extend the exceptionally long service life of KAESER Dental compressed air systems.

Compact PPS control unit The "Permanent Power System" controls switching via a 4/2-way solenoid valve.

Dependable: SECCOMAT dental dryers Dryer power is significantly increased if condensate droplets are pre-separated from the air before it reaches the dryer. By using warm air, the "Permanent Power System" is able to regenerate the desiccant faster and more reliably.