Sheet #677u – Air Supply
Version 1.04a User guide ATEQ 6th series Page 1/1
AIR SUPPLY
Air supply is via the filter located on the rear panel of the
instrument.
When an electronic regulator is installed in the instrument
with test pressures above 800 kPa (8 bar) (normal service
pressure), another "high pressure" port for the regulator
supply circuit is installed on the instrument.
It is essential that the air supplied is clean and dry. Even though there is a filter, supplied with
the instrument, the presence of dust, oil or impurities may cause malfunction.
When the instrument is working in vacuum conditions, impurities must be prevented from being
drawn into its interior. For this purpose we strongly recommend that a suitable airtight filter is
installed between the test part and the instrument. This filter can be supplied by ATEQ.
The presence of impurities, oil or humidity in the air may cause deterioration which will
not be covered by the warranty.
In accordance with ISO standard 8573-1 concerning classes of compressed air for
measurement instruments in an industrial environment:
ATEQ recommends:
x Grain size and concentration CLASS 1 (0.1 µm and 0.1 mg/m
3
)
x Dew point under pressure CLASS 2 (- 40° dew)
x Maximum concentration of oil CLASS 1 (0.01 mg/m
3
)
ATEQ recommends the installation:
x of an air dryer to provide dry air at less than - 40° dew point,
x of a 25 micron and 1/100 micron double filter.
Optimisation of operation:
The supply pressure must always be between 4 and 8 bar to ensure that the pneumatic valves
operate with optimum efficiency.
When a mechanical regulator is used, the supply pressure must be a minimum of 100
kPa (1 bar) greater than test pressure with a minimum of 400 kPa (4 bar).
If an electronic regulator is used, the regulator input pressure must be at least 10%
greater than the value of full scale on the electronic regulator + 100 kPa (+ 1 bar).
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