9
VEGAPULS 61
37991-EN-200303
such as e.g. plastic housing, metal housing with inspection window or plastic antenna, have a cau-
tion label pointing out the safety measures that must be taken with regard to electrostatic charges
during operation.
WARNING - POTENTIAL ELECTROSTATIC
CHARGING HAZARD - SEE INSTRUCTIONS
Caution: Plastic parts! Danger of electrostatic charging!
•
Avoid friction
•
No dry cleaning
•
Construction/Installation: The VEGAPULS PS61(*).C****P/K/F/L**** must be constructed/
installed in such a way that
– electrostatic charges are ruled out during operation, maintenance and cleaning.
–
process-related electrostatic charges, e.g. by measuring media flowing past, are ruled out
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Use of an overvoltage arrester
If necessary, a suitable overvoltage arrester can be connected in front of the VEGAPULS
PS61(*).C****P/K/F/L****.
When used as category 1G or 1/2G instrument, a suitable overvoltage arrester must be connected
in between as protection against overvoltages, as far as required according to EN 60079-14.
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Grounding
In order to avoid the danger of electrostatic charging of the metallic parts, the VEGAPULS
PS61(*).C****P/K/F/L**** must be electrostatically connected to the local potential equalisation
(transfer resistance ≤ 1 MΩ), e.g. via the ground terminal, when used as category 1G or 1/2G instru
-
ments.
Metallic adapter flanges must be earthed, especially when installed on non-conductive plastic ves
-
sels or non-earthed vessels. Earthing can be realised with cable lug via the flange gland.
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Impact and friction sparks
When used as category 1G instruments, the VEGAPULS PS61(*).C****P/K/F/L**** in aluminium/
titanium versions must be mounted in such a way that sparks from impact and friction between alu-
minium/titanium and steel (except stainless steel, if the presence of rust particles can be excluded)
cannot occur.
10 Material resistance
For applications requiring instruments of category 1G or category 1/2G the VEGAPULS
PS61(*).C****P/K/F/L**** must only be used in products against which the wetted materials are suf
-
ficiently resistant.
11 Mounting with external display unit VEGADIS 61/81
The intrinsically safe signal circuit between VEGAPULS PS61(*).C****P/K/F/L**** and the external
indicating unit VEGADIS 61/81 should be set up without grounding. The required insulation voltage
is > 500 V AC. When using the VEGA connection cable included with the delivery, this requirement
is fulfilled. If grounding of the cable screen is required, it must be carried out according to EN 60079-
14.
