HYDAC ELECTRONIC HFS 2500, Руководство по эксплуатации, Страница: 24 / 40

Flow switch HFS 2500 with ATEX approval Page 4
Status 2020/05/19 HYDAC ELECTRONIC GMBH Mat. No.: 669884
3.2 Proper / Designated use
The devices of the HFS 2500 series in ATEX design are used to continuously monitor flows of
water and water-based fluids in potentially explosive areas. Any use extending beyond or deviating
from this shall constitute improper use. Unless otherwise indicated, the instrument measuring
scales relate to water. With particular regard to applications with intermittent loads (e.g. pulsed
operation), please consult our technical sales department beforehand, so that the necessary
checks can be made.
The instruments must not be used as single source to avoid dangerous situations on machinery
and in plants. Machinery and plants must be constructed in that way, that faulty conditions do not
lead the operators into dangerous situations.
The switch unit must not be employed in machinery, plants or medical apparatus where, in case of
trouble, persons, animals or things could be harmed.
The unit must not be used in areas where electrostatic charges of the plastic housing might occur
.
3.3 Qualified personnel
The instruments, series HFS 2500, must only be installed by qualified personnel, which is capable
of using these instruments in a professional manner. Qualified personnel are such persons, which
are familier with the erection, installation, commissioning and operation of these instruments and
which hold a corresponding qualification for this function.
3.4 Warning notices
Do not clean the switch unit with aggressive cleaning agents or solvents, nor store or install the
unit in aggressive atmosphere to avoid damage to the employed plastics.
Cleaning must not take place in potentially explosive areas.
Ensure that the plastic housing is not electrostatically charged during cleaning. If this cannot be
ensured, the housing must be discharged on all sides, outside the potentially explosive area, by
means of a grounded metal plate before bringing the unit back into the potentially explosive area.
In explosive areas, the plastic housing must under no circumstances be exposed to handling or
processes which can lead to electrostatic charging of the housing.
When removing the flowmeter and switch unit from the process line, ensure that no flow medium
comes in contact with the switch housing and/or connecting cable.
The sensor side of the switch unit (opposite the cable entry) is fragile due to its function and must
be protected against mechanical damages when removed from the flow meter.
The switch unit must be installed so that the connecting cable is not pinched, chafed or otherwise
damaged and must not come in contact with parts which exceed temperatures of 75 °C (at T6) or
90 °C (at T5). The mounting of the switch unit onto flowmeters installed into a process line
subjected to severe vibrations must be avoided, as this may cause malfunctions, such as
loosening of the fixing screws, inexact measured values or cable failure.
The switch unit must not be employed in machinery, plants or medical apparatus in which, should a
malfunction arise, persons, animals or property could be injured or damaged.