Instructions for Use
– SCHMIDT
®
Flow Sensor SS 23.400 ATEX 3
Page 12
electric, low-resistance contact with the sensors enclosure
9
.
When using a cable the locking screw at the plug-in connector
of the sensor is designed for this purpose.
In general the following applies for the grounding:
The external ground connection on the enclosure must be
connected to the equipotential bonding of the Ex area with
low resistance.
No equipotential current must flow between the Ex areas
and non-hazardous areas.
Minimum cable cross-section: 1 x 4 mm
2
The screw must be tightened firmly at the terminal so that
the conductor cannot be loosened or twisted.
Connecting the cable
Connect the shield meshwork (in the non-hazardous
area) to the ground potential on a large surface.
No equipotential current must flow between the Ex areas
and non-hazardous areas.
Labeling
The rating plate for labeling according to the standards is fixed
at the sensor by means of a wire loop.
If required, the customer can attach this plate at another place
provided that it can be clearly assigned to the sensor and is
legible and undetachably. Examples are:
Mounting it directly at the sensor by means of machine
screws through the fixing hole.
Mounting it undetachably onto the wall according to
EN 60079-0, chapter 29.6. The side with the warning note
"Do not disconnect under voltage" must remain visible.
9
The types of holders supplied by
SCHMIDT
®
are not suitable for this purpose.
