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PROline Prosonic Flow 93 FOUNDATION Fieldbus
Endress+Hauser
Special instructions
1. The flowmeter must be integrated into the potential equalisation system.
Potential must be equalized along the intrinsically safe sensor circuits.
If the shield of the bus cable is grounded at multiple points, provide potential
equalisation as illustrated in Fig. 8, Page 19.
2. The specified temperature class/surface temperature in conjunction with the ambi-
ent temperature and the medium temperature must be in compliance with the tables
on Page 3.
3. The following rules apply for connecting the electronics housing of the EEx d rated
version:
Use only specially approved cable glands and cable entries (EEx d IIC), suitable for
operating temperatures up to 80 °C.
If conduit entries are used, the seals must be positioned immediately adjacent to the
housing.
4. The following rules apply for connecting the electronics housing of the EEx e rated
version:
Use only specially approved cable glands and cable entries (EEx e), suitable for
operating temperatures up to 80 °C and having an IP 67 protection rating.
5. It is not permissible to connect the service adapter in explosive atmospheres.
6. Seal cable entries tight.
Installation instructions
• If the category "ia" intrinsically safe circuits of the flowmeters are connected to certi-
fied intrinsically safe category "ib" circuits with explosion group IIC resp. IIB ratings,
the ignition protection rating changes to EEx ib IIC resp. EEx ib IIB, as applicable.
Intrinsically safe category "ib" circuits are suitable for use in environments that require
category 2 equipment.
• Zone 21:
The surface temperature of the measuring device must not exceed 2/3 of the ignition
temperature of a dust cloud. The maximum surface temperature must maintain a
safety distance of 75K for the glow temperature of a dust layer of 5 mm.
Example: a configuration of temperature class T4 (135 °C) is thus suitable for dust with
an ignition temperature of 202.5 °C (1.5 x 135 °C) and a glow temperature of 210 °C
(135 °C + 75 °C).
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