KROHNE UFM500 User Manual

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©

KROHNE 07/2002 7.02254.21.00

installation and
operating instructions

Addition to the

UFM 500 K - EEx ATEX

Ultrasonic
compact flowmeter

Preasure and temperature

WARNING !

No changes may be made to the devices. Unauthorized changes
might affect the explosion safety of the devices.

These additional instructions are an extension to the standard Installation and
Operating Instructions and only applies for the EEx version of the UFM 500 K
compact ultrasonic flowmeter. All technical information described in the
standard Installation and Operating Instructions are applicable, when not
specifically excluded or replaced by the instructions in these additional
instructions.

CONTENTS

1. SYSTEM COMPONENTS .................................................................................................2

1.1 GENERAL INFORMATI ON....................................................................................................2

1.2 UFS 500-EEX PRIMARY HEAD ..........................................................................................2

1.3 UFC 500-EEX SIGNAL CONVERTER ..................................................................................3

1.3.1 Electronics compartment .......................................................................................3

1.3.2 Terminal compartment..........................................................................................3

2. ELECTRICAL CONNECTION...........................................................................................4

2.1 POTENTIAL EQUALIZATION ................................................................................................4

2.2 OPERATION OF THE SIGNAL CONVERTER...........................................................................5

3. CONNECTING CABLES ....................................................................................................5

4. CONNECTION DIAGRAM.................................................................................................6

5. SERVICE..............................................................................................................................7

5.1 REPLACEMENT OF ELECTR ONICS UNIT OR MAINS FUSE(S) .................................................7

5.1.1 Replacement of electronics unit............................................................................8

5.1.2 Replacement of mains fuse(s)..............................................................................8

5.1.3 Changing power supply voltage (not for 24 V AC/DC version)..........................11

6. SPARE PARTS .................................................................................................................11

7. MAINTENANCE................................................................................................................11

8. EC-TYPE EXAMINATION CER TIFICATE....................................................................12

9. DECLARATION OF CONFORMITY..............................................................................16

10. DATA PLATE...................................................................................................................17

Be sure to follow these instructions !

IMPORTANT !

• The prescriptions and regulations as well as the electrical data described in the EC
type examination certificate must be obeyed .

• Beside the instructions for electrical installations in non-hazardous locations according
to the applicable national standard (equivalent of HD 384 or IEC 364, e.g. VDE 0100),

especially the regulations in EN 60079-14 "Electrical installations in hazardous
locations" or equivalent national standard (e.g. DIN VDE 0165 Part 1) must be strictly

followed.

• Installation, establishment, utilization and maintenance are only allowed to be
executed by personnel with an education in explosion safety !

1

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. Ta) 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.

Temperature class

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)

Ta ≤ 40°C Ta ≤ 50°C Ta ≤ 60°C

Maximum process liquid temperature

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 : Ui = 13.1 V

• Maximum input current : Ii = 600 mA

• Maximum internal capacitance : Ci = 7.7 nF (maximum, 2 sensor circuits)

• Maximum internal inductance : Li = 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.

2

1.3 UFC 500- EEx signal converter

The UFC 500-EEx signal converter consists of a cylindrical housing made of die-casted
aluminum. It has of two separate compartments, divided from each other by an integrated
wall with casted flameproof terminal feed-through. The interconnecting part to the primary
head at the bottom of the housing contains a flameproof wire or coaxial cable feed-through.
The housing is closed on both ends by a cylindrical cover with M115x2-6g screw -thread and
O-ring sealing. The signal converter housing has an ingress protection degree in accordance
with the EN 60529 of at least IP 67. The two compartments are described in detail below.

1.3.1 Electronics compartment

The electronics compartment accommodates the UFC 500-EEx electronic unit. The
compartment is designed with type of protection flameproof enclosure "d" in accordance with
EN 50018. It is closed by a flameproof display cover with glass window, which is glued and
additionally me chanical supported by a screwed in back-up ring made of aluminum.

The UFC 500-EEx electronics unit is inserted into the electronics compartment with the help
of two sliding rubbers that position and fixate the unit at the front inside the housing. Two M4
screws mount the unit and a third M4 screw fixates the brass earth strip at the back-end of
the printed circuit board with integrated voltage/current limiting circuit (i.e. front-end PCB).
The three screws are screwed to the integrated wall in-between terminal and electronics
compartment. The integrated voltage/current limiting circuit provides the ultrasonic sensors
inside the primary head with type of protection intrinsic safety "ib" according to EN 50020.

The voltage/current limiting circuit has the following maximum values (i.e. entity parameters):

• Maximum output voltage : Uo = 8.72 V

• Maximum output current : Io = 380 mA

• Maximum allowed external capacitance : Co = 1.2 µF

• Maximum allowed external inductance : Lo = 0.17 mH

1.3.2 Terminal compartment

The terminal compartment accommodates seven M4 clamp terminals for connection of the
power supply and the signal output circuits (binary and current outputs). Figure 1 on the next
page shows the terminal arrangement. The terminals are separated from each other by
insulation plates (nine in total, from which one at each end of the row).

In the following section the electrical connection of the mains supply power and the signal
output circuits is described (this information only concerns the Ex-relevant subjects).

The terminal compartment (standard in type of protection increased safety "e") is standard
equipped with two metal cable glands.
As an option (must be explicitly ordered!) the terminal compartment can be provided as a
flameproof enclosure "d", in case the customer wants to use pre-certified "EEx d" cable
glands or conduits.
Note: EEx d certified cable glands are no part of the standard delivery, they must be provided
by the customer himself or ordered explicitly.

For flameproof conduit systems, the terminal compartment must have type of protection
flameproof enclosure "d" according to EN 50018. The conduits must be sealed by "EEx d"
approved (within the ATEX 100a directive) sealing devices (i.e. stopping box) directly at the
conduit entrances of the as flame proof enclosure performed terminal compartment.

3

Pulse

Status

2. ELECTRICAL CONNECTIO N

NOTE:
All the connecting cables that enter the terminal compartment of the UFC 500-EEx

signal converter (i.e. power supply, current and binary in-/outputs cables) are not
intrinsically safe !

The arrangement of the terminals in the terminal compartment is shown in Figure 1 below.
For mains voltages above 50 Vac the PE conductor must be connected to the PE-terminal in

the terminal compartment.
To connect external devices to the current and binary output terminals, the wiring

requirements for the specific type of protection of the terminal compartment (standard:
increased safety "e", special version: flameproof enclosure "d") must be respected, see the
EN 60079-14 or corresponding national standard.

2.1 Potential equalization

The UFM 500 K-EEx ultrasonic compact flowmeter must always be connected to the
equipotential bonding system of the hazardous area. For this purpose the internal PE­terminal (over the PE-conductor of the mains) or the external PE-terminal may be used.
The external PE-terminal is placed halfway converter housing and primary head.

A separate bonding conductor must be at least 4 mm2, or 2,5 mm2 if mechanical protected,
see clause 413 of HD 384.4.41or IEC 364-4-41 for additional information.

When the UFM 500 K-EEx is incorporated in the equipotential bonding system, make sure
that the core of the bonding wire is properly mounted under the U-clamp of the PE-terminal
and that the screw is tightly fixed.

output output

B1 B⊥ B2 I+ I L N (100…240V AC / 48…63 Hz)
L~ L~ (24V AC/DC)

BINARY CURRENT
OUTPUTS OUTPUT

PE (Protective Earth) terminal
FE (Functional Earth) terminal

Figure 1: Arrangement of terminals in terminal compartment.

4

Ri

≤

680

Ω

I+

I

mA

I ≤ 150 mA

B1 B⊥ B2

U

ext

~

I ≤ 150 mA

+

Electronic
or
electro­mechanical
totalizer

Figure 2: Passive pulse/status output. Figure 3: Active current output.

NOTE:

The status output (terminals B1, B⊥ and B2) can only be configured as passive outputs,
the current output (terminals I+ and I) can only be configured as active output.

000

U

≤ 32VDC/24 VAC

ext

e.g. signal
indicator

_

2.2 Operation of the signal converter

The UFC 500-EEx signal converter unit of the UFM 500 K-EEx compact flowmeter is
equipped with a display unit that contains magnetic Hall sensors. These Hall sensors enable
the settings of the UFC 500-EEx signal converter electronics to be set resp. reset with the
help of the with the apparatus delivered bar magnet without opening the flameproof signal
converter housing in the hazardous area. Consult the standard Installation and Operating
Instructions (Part B) for the program functions of the software of the UFC 500-EEx
electronics unit.

3. CONNECTING CABLES

NOTE:

The below described cables are shown in the connection diagram on the following page.

Cable A:

Signal cable for current output and binary in-/outputs (pulse and status output). This cable
type must be in accordance with clause 9 of the EN 60079-14 "Electrical installations in
hazardous locations" or an equivalent national standard (e.g. DIN VDE 0165 Part 1).

Cable B:

Mains power supply cable. This cable type must also be in accordance with clause 9 of the
EN 60079-14 "Electrical installations in hazardous locations" or an equivalent national
standard (e.g. DIN VDE 0165).

Rated voltage: ≥ 500 V
Examples: H07..-., H05..-. to HD 21.S2 or HD22.S2

Separate bonding conductor

Minimum cross-sectional area: 4 mm2

5