KROHNE ALTOSONIC V EEx EN - Manual (Page 6)

ALTOSONIC V 2
1. System components
1.1 General information
The ALTOSONIC V ultrasonic flowmeter system, consisting of a combination of the UFS 500
F/5STR-EEx Ultrasonic Flow Sensor and the UFC-V/…-EEx Ultrasonic Flow Converter, in
separate design, is in accordance with the European Directive 94/9 EG (i.e. 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 Flow Sensor is approved under approval
number PTB 01 ATEX 2012 X and the flow converter under KEMA 02 ATEX 2168 (see
Appendix 1).
1.2 Flow Sensor
The UFS 500 F/5STR-EEx high-accuracy Flow Sensor has five sensor pairs (10 sensors) in
type of protection Intrinsic Safety category "ib" according to EN 50020. All internal sensor
circuits are wired by separate coaxial cables and connected through SMB connectors that
are each marked by a number x.1 resp. x.2 (opposite sensor), where x runs from 1 to 5 for
each sensor circuit. Each of the five sensor circuits is driven by its own (of the five in total)
individual UFC 500-EEx electronics unit that is installed in the flameproof junction box of the
UFC-V/…-EEx flow converter.
Each of the five intrinsical safe "ib" sensor circuits has the following entity parameters:
Maximum input voltage
: V
max
= 13.1 V
Maximum output current : I
max
= 600 mA
Maximum internal capacitance : C
i
= 3.9 nF
Maximum internal inductance : L
i
= 38.3 µH
The UFS 500 F/5STR-EEx high-accuracy Flow Sensor is available in meter sizes up to
DN500. It is designed for ambient temperatures from -40°C up to +60°C and process liquid
temperatures from –20°C up to +120°C. See table below for temperature classification.
Temperature class Maximum process liquid temperature at Ta = 60°C
T6 80°C
T5 95°C
T4 120°C
The UFS 500 F/5STR-EEx Flow Sensor is marked with the following code: II 2G EEx ib IIC
T6…T4 (see data plates in Appendix 3).
1.3 Flow Converter
The UFC-V/…-EEx Ultrasonic Flow Converter is available in a standard version and a low-
temperature version, which has type designation UFC-V/LT-EEx. The standard version is
suitable for ambient temperatures in the range of -20°C up to +60°C. The low-temperature
version is suitable for -55…+60°C with rigid conduit connections and -50…+60°C with cable
gland connections. The maximum surface temperature of the flameproof enclosure will not
exceed 95°C (including a 5 K safety margin) and the UFC-V/…-EEx is therefore marked with
temperature classification T5.
The UFC-V/…-EEx Ultrasonic Flow Converter is marked with the explosion safety code: II
2G EEx d [ib] IIB T5 (see data plates in Appendix 3).
1.3.1 Versions
The UFC-V/…-EEx Ultrasonic Flow Converter is available as standard version with type
designation UFC-V/EEx and as low temperature (LT) version, designated UFC-V/LT-EEx.