KROHNE UFM 500 ATEX EN - Manual (Page 3)

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1. SYSTEM COMPONENTS
1.1 General information
The Altosonic UFM 500 K-EEx ultrasonic compact flowmeter is in accordance with the
European Directive 94/9 EC (ATEX 100a) and approved for hazardous classified locations of
Zone 1 and 2 by the PTB conform to the European Standards of the EN 500xx series. The
UFM 500 K-EEx has the following approval number.
PTB 01 ATEX 2015 X
The UFM 500 K-EEx compact flowmeter is designed for ambient temperatures (i.e. T
a
) in the
range of -40°C up to +60°C. The maximum allowed process liquid (medium) temperature is
restricted by the combustible atmosphere that (possibly) surrounds the apparatus,
determined by the temperature class of the atmosphere, see Table 1 below.
Maximum process liquid temperature
Temperature class
T
a
≤
40°C T
a
≤
50°C T
a
≤
60°C
T6 80°C 80°C 80°C
T5 95°C 95°C 95°C
T4 130°C 130°C 125°C
T3 180°C 165°C 125°C
Table 1: Temperature classification of the UFM 500 K-EEx.
The UFM 500 K-EEx ultrasonic compact flowmeter consists of the UFC 500-EEx signal
converter, which is screwed on top of the UFS 500-EEx primary head (i.e. measuring unit).
The compact flowmeter is marked with one of the codes below:
Standard (default) version:
•
II 2G EEx de [ib] IIC T6…T3 for the terminal compartment of the signal converter housing
in type of protection increased safety "e" according to EN 50019 (see also Section 1.3).
Optional version (only if explicitly ordered!):
•
II 2G EEx d [ib] IIC T6…T3 for the terminal compartment of the signal converter housing
designed as flameproof enclosure "d" according to EN 50018 (see also Section 1.3)
1.2 UFS 500-EEx primary head
The UFS 500-EEx primary head is the measuring unit of the compact flowmeter and contains
the ultrasonic sensors (a multiple of two opposite transducers) in type of protection intrinsic
safety category "ib" according to EN 50020. All sensor circuits (only internal circuits) are
wired by separate coaxial cables and connected through SMB connectors marked by number
from 1 through 4. The UFC 500-EEx signal converter (described in the next section) is
mounted on top of the primary head by four hexagon socket head cap screws size M6.
The intrinsically safe "ib" ultrasonic sensor circuits inside the UFS 500…-EEx primary head
have the following maximum values (i.e. entity parameters):
•
Maximum input voltage : U
i
= 13.1 V
•
Maximum input current : I
i
= 600 mA
•
Maximum internal capacitance : C
i
= 7.7 nF (maximum, 2 sensor circuits)
•
Maximum internal inductance : L
i
= 134 µH (maximum, 2 sensor circuits)
NOTE:
The intrinsical safe sensor circuits of the UFM 500K-EEx compact flowmeter are only
internal circuits and not accessible for the customer. The above data (entity parameters)
as well as in Section 1.3.1 on the next page are therefore for information only.