KROHNE UFM500 User Manual

Variable area flowmeters

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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

S3 S4

BINARY

CURRENT

MAINS

ELECTRO

NICS COMPARTMENT

PE

N L PE

100-240V AC

Fl

ameproof (EEx d)

Flameproof (EEx d)

4x Coaxial cable of

B A

4. CONNECTION DIAGRAM

N L FE 24-48V AC
SIGNAL IN-/OUTPUTS L~ L~ FE 24V AC/DC

UFC 500…-EEx

Signal Converter

B1 B⊥ B2 I+ I L N

OUTPUTS OUTPUT SUPPLY

TERMINAL COMPARTMENT
Standard "EEx e" (optional "EEx d")

Always "EEx d"
Intrinsical safe ("ib") sensor outputs

"1" "3" "2" "4"

FE

terminal feed-through

2

EQUIPOTENTIAL BONDING CONDUCTOR ≥ 4 mm

cable feed-through

Hazardous locations

of Zone 1 and 2

type RG 179 B/U

S1 S2

Flow tube

UFS 500…-EEx

Primary Head

Intrinsical safe sensor circuits

6

A A C

B

B

Flat cable of

5. SERVICE

5.1 Replacement of electronics unit or mains fuse(s)
IMPORTANT !

The following instructions must be followed carefully, if the flameproof UFM 500 K-EEx
signal converter housing has to be opened respectively closed again !

Before opening:

♦ Make absolutely sure that there is no explosion hazard !
♦ Gas-free certificate !
♦ Make sure that all connecting cables are safely isolated from the mains and low-

voltage circuits!

♦ Allow the prescribed waiting time to elapse before opening the housing:

20 minutes for temperature class T6
11 minutes for temperature class T5

When the instructions above are strictly followed, the cover of the electronics compartment
may be removed. First unscrew the hexagon socket head cap screw of the interlocking
device by a hollow -head screw wrench size 3, until the cover can rotate freely. Unscrew the
cover with the special plastic wrench (black) that is supplied with the apparatus.

After opening:

♦ The brass grounding strip at the back of the electronics unit must be securely screwed to

the housing (back-end of electronics compartment) by screw C (see Figure 5 below). The
electronics unit is screwed into the electronics compartment by two screws B. Before
screws B and C can be accessed, the display unit must be removed via screws A.

♦ Before the cover is screwed back into the housing, the screw -thread must be clean and

well-greased with an acid and resin-free grease, e.g. silicone grease.

♦ Screw the cover into the housing. Screw the hexagon socket head cap screw of the

interlocking device tight.

Display unit

display unit

Brass earth strip

Figure 5: Display unit (left) / Electronics unit after removal of display unit (right).

7

5.1.1 Replacement of electronics unit

See the standard Installation and Operating Instructions for detailed information about
resetting and reprogramming the new electronics unit after replacement. Important customer
specific data (like the value of the internal totalizer) should be noted before replacing the
electronics unit !

Before commencing work, note the instructions in Section 4.1 ("Before opening") .
Then continue as follows:

1. Loosen the interlocking device and remove the cover of the electronics compartment.

2. Unscrew the two screws A (see figure 5 in section 4.1) of the display unit and turn display

unit carefully aside or remove the unit completely by taking out the flat cable connector.

3. Unscrew the two mounting screws B of the electronics unit as well as screw C, which

fixes the brass earth strip at the back of the housing. A screwdriver with a long shaft (200
mm) can best be used to unscrew C (e.g. screwdriver type Philips No. 2).

4. Pull the electronics unit carefully out of the converter housing, till the SMB connectors of

the coaxial cables can be unplugged easily. Then remove the complete electronics unit
and replace it with a new one.

5. Check on the new electronics unit if the voltage setting (only applicable for AC supplies)

and mains fuse rating are correct. Change the voltage setting (see Section 3.1.3) or
exchange the mains fuse (see Section 3.1.2) if necessary.

6. Carefully insert the electronics unit till the numbered SMB connectors can be connected

to the corresponding numbered SMB receptacles on the electronics unit. Then mount the
unit completely into the housing and fix the screws. First C, then B and finally screw the
display unit on the electronics via screws A, after the flat cable connector is connected.

7. Screw the cover of the electronics compartment back into the housing.

Note the instructions of section 4.1 ("After opening") during reassembling.

IMPORTANT !

Carefully keep the coaxial cables to the side of the housing, while inserting the electronics
unit into respectively removing it from the converter housing. This is to prevent damaging
of the coaxial cables !

5.1.2 Replacement of mains fuse(s)

a) AC versions 115/230 V AC and 100/200 V AC

Before commencing work, note the instructions in Section 4.1 ("Before opening") .
Then continue as follows:

1. Loosen the interlocking device and remove the cover of the electronics compartment.

2. Unscrew the two screws A (see figure 5 in section 4.1) of the display unit and turn the

display unit carefully aside.

3. The fuse -holder, in which the mains fuse in accordance with IEC 127-2 size Ø5 x 20 mm,

(breaking capacity high) is mounted, is now accessible to replace the defect mains fuse
F1 by a new fuse with the same rating. The rating depends on the voltage setting of the
power supply unit. (T200mA for 100 or 115V AC and T125mA for 200 or 230 V AC). See

also the yellow sticker that is glued on the mains transformer as shown in Figure 6 on the
next page.

4. Reassemble the unit in reverse order (points 2 and 1).

Note the instructions of section 4.1 ("After opening") during reassembling.

8

Mains transformer

Indication of

115/230 VAC version

Sticker with fuse rating

Mains fuse F1 (in fuse-holder)

Voltage selector

voltage selector

(black dot = notch)

SIDE OF DISPLAY UNIT

Figure 6: Power supply version 115/230 V AC.

b) 24 V AC/DC version

Before commencing work, note the instructions in Section 4.1 ("Before opening") .
Then continue as follows:

1. Loosen the interlocking device and remove the cover of the electronics compartment.

2. Unscrew the two screws A (see figure 5 in section 4.1) of the display unit and disconnect

the display unit via the flat cable connector (see the right picture of Figure 5 on the
previous page).

3. Unscrew the brass earth strip (screw C) with the and the mounting screws B of the

electronics unit. Pull the unit out until the SMB connectors of the coaxial cables can be
disconnected from the electronics. Then take out the complete electronics unit. Be careful
with the coaxial cables, so that they do not damage while removing the electronics unit
from the flow converter housing.

4. The mains fuses F1 and F2 (see Figure 7 on the next page) can be replaced now. The

24 V AC/DC power supply uses two sub-miniature fuses rated T1.25A in accordance with
IEC 127-3 publication.

5. Reassemble in reverse order (points 3 through 1).

Note the instructions of section 4.1 ("After opening") during reassembling.

9

Location of mains fuses

F2

F1

(see detail in Figure 8)

Figure 7: UFC 500-EEx electronics unit with 24 V AC/DC power supply.

Figure 8: Location of fuses F1, F2 on 24 V AC/DC unit.

10

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

Before commencing work, note the instructions in Section 4.1 ("Before opening") .
Then continue as follows:

1. Loosen the interlocking device and remove the cover of the electronics compartment.

2. Unscrew the two screws A (see figure 5 in section 4.1) of the display unit and turn display
unit carefully aside or remove the unit completely by taking out the flat cable connector.

3. Unscrew the two mounting screws B of the electronics unit as well as screw C, which
fixes the copper earth strip at the back of the housing. A screwdriver with a long shaft

(200 mm) can best be used to unscrew C (e.g. screwdriver type Philips No. 2).

4. Pull the electronics unit carefully out of the converter housing, till the SMB connectors of
the coaxial cables can be unplugged easily. Then remove the complete electronics unit.

5. The voltage setting of the power supply can be changed by turning the dummy dual-in­line block (i.e. voltage selector, see Figure 6 on page 6) over 180° in its socket. The

position of the notch on the dummy dual-in-line block indicates the voltage setting. Also
see the sticker that is mounted on the mains transformer (see Figure 6).

6. Carefully insert the electronics unit back into the housing until the numbered SMB
connectors can be connected to the corresponding numbered SMB receptacles on the
electronics unit. Then mount the unit completely into the housing and fix the screws. First
C, then B and finally screw the display unit on the electronics via screws A, after the flat

cable connector is connected.

7. Screw the cover of the electronics compartment back into the housing.

Note the instructions of section 4.1 ("After opening") during reassembling.

IMPORTANT !

Carefully keep the coaxial cables to the side of the housing, while inserting or removing
the electronics unit into respectively from the converter housing. This is to prevent

damaging of the coaxial cables !

6. SPARE PARTS

UFC 500-EEx

electronics unit

230 Vac T125H250V (to IEC 60127-2) 5.06627.00.00
115 Vac
200 Vac T125H250V (to IEC 60127-2) 5.06627.00.00
100 Vac

24 Vac/dc 2.10681.00.00 T1.25A 250V (to IEC 60127-3)

Krohne part no.

2.10680.00.00

2.10681.03.00

Type of mains fuse(s) Krohne part no.

T200H250V (to IEC 60127-2) 5.05678.00.00
T200H250V (to IEC 60127-2) 5.05678.00.00

5.09080.00.00

7. MAINTENANCE

The UFM 500 K-EEx ultrasonic compact flowmeters are maintenance free with regard to the
flowmetering properties.

Within the scope of the periodical inspections, which are required for electrical apparatus that
are installed and used in hazardous classified locations, it is recommended to check the
flameproof converter housing on signs of corrosion.

11

8. EC-TYPE EXAMINATION CERTIFICATE

Translation in English.

12

EC-type examination certificates, translation in English continued.

13

EC-type examination certificate, original in German.

14

EC-type examination certificate, original in German continued.

15

9. DECLARATION OF CONFORMITY

16

10. DATA PLATE

17

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KROHNE Inc.
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Overseas Representatives

Other Countries:

KROHNE Messtechnik
GmbH & Co. KG
Ludwig-Krohne-Str.
D-47058 Duisburg
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FAX: [phone]
e-mail: [e-mail]

Subject to change without notice