Multi-layer diaphragm pump
Serie 409.2 ML
Operating instruction
TA 431
Rev.
8 en
06/2015
Technical modifications reserved!
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25
9
Operation in explosion-hazardous areas
9.1
General
CAUTION!
The prerequisite for the use in explosion-hazardous areas
is an appropriate design of the pump.
The product supplied by
sera
meets the requirements of di-
rective 94/9/EC. This guarantees a safe operation in explosion-
hazardous areas.
CAUTION!
It is the operator’s task to define the field of application
and to check whether the pump is suited for this applica-
tion. He/she must clearly define the zone, the device cate-
gory, the explosion group and the temperature class.
9.2
Identification
The pump bears a label stating the zone/device category/
explosion group/temperature class in compliance with directive
94/9/EC.
•
Ex II2G c IIBT4
or
•
EX II2G c IICT4 respectively
(observe any special data that are contained in the order
confirmation.)
9.3
Installation
9.3.1
General
Please see the order confirmation or product description for
the operating conditions provided for the pump in potentially
explosive area. The indicated limit values should not be fallen
below or exceeded.
Installation regulations given in the operating instructions must
be adhered to.
9.3.2
Working in explosion-hazardous areas
CAUTION!
Use only suitable tools for performing assembly and
maintenance work on machines or plants in explosion-
hazardous areas.
Directive 99/92/EC must be observed.
9.4
Potential equalisation
After fixation, make sure that the pump is properly connected
to the potential equalisation system on site.
9.5
Start-up
After installation, the pump must immediately be used for the
suction of fluids, i.e. the pump must immediately be started
after the tank has been installed and filled.
9.6
Operation
9.6.1
General
The intended operating conditions in explosion-hazardous ar-
eas can be seen from the Inspection Certificate and the Decla-
ration of Conformity in compliance with directive 94/9/EC. The
indicated limit values should not be fallen below or exceeded.
Details about zone, device category, explosion group and tem-
perature class can be seen from the Declaration of Conformity.
9.6.2
Degassing of the dosing medium
Never let the pump run dry. Check the liquid level in the tank
during operation of the pump. Make sure that the pump is
switched off if the liquid level in the tank falls below the mini-
mum level required (explosive atmosphere may be carried
over).
Vapour bubbles from the dosing medium are harmless as they
have no explosive potential.
CAUTION!
The formation of an explosive mixture of gases must be
prevented.
9.6.3
Temperature indications
permissible ambient temperature
0°C
≤
Ta
≤
+40°C
9.7
Maintenance
The maintenance instructions listed in Chapter 10 are general-
ly applicable.
Exception:
CAUTION!
The oil level in the stroke drive of the pump must be
checked once a week!