Chapter 1 – Installation of the instrument
UM-18400E-U ATEQ F580 User manual Page 28/168
4.3.14. 4) Pneumatic supply
Air supply is via the filter located on the rear panel of the
instrument.
Note: when an electronic regulator is used with test
pressures above 800 kPa (8 bar) (normal service
pressure), another "high pressure" input for the test
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 guarantee.
In accordance with ISO standard 8573-1 concerning classes of compressed air for
measurement instruments in an industrial environment :
ATEQ recommends :
• Grain size and concentration CLASS 1 (0.1 µm and 0.1 mg/m
3
)
• Dew point under pressure CLASS 2 (- 40° dew)
• Maximum concentration of oil CLASS 1 (0.01 mg/m
3
)
ATEQ recommends the installation :
• of an air dryer to provide dry air at less than - 40° dew point,
• 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
distributors 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).
When an electronic regulator is used, the regulator input pressure must be
at least 10 % greater than full scale value of the electronic regulator
+ 100 kPa (+ 1 bar).
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