KROHNE DWM1000, DWM-2000 User Manual

03/12

Electromagnetic
Flow Switch and Flow Meter

Installation and
Operating
Instructions

DWM 1000
DWM 2000
DWM 2000 L
DWM 2000 IP68

KROHNE

CERTIFIED

ISO

9001

S.A.

Contents

Page

Introduction.....................................................3

Special Features
Measuring Principles
Components

Installation.......................................................4

Mounting on Pipeline
Dimensions and Weight

Electrical Connection and Settings

DWM1000................................................5

DWM2000................................................6

Compatible Relays (for DWM1000)...........7

Version DWM2000 IP68.............................8

Version DWM2000 Long

Characteristics ........................................8

Components............................................8

Installation................................................9

Trouble Shooting............................................10

Technical Data................................................11

KROHNE Contact Addresses.....................12

2

3

DWM Flow Meters and Switches

The DWM electromagnetic flow meters and switches are
desi

gned to measure and monitor the flow rates of
e l e c t r i c a l l y c o n d u c t i v e l i q u i d s , p a s t e s a n d
s l u r r i e s

Versions

 DWM 1000 flow switch, 2-wire
 DWM 2000 flow meter, 4-20 mA current
 DWM 2000 L (Long) for flow pipes of greater than 400m

 DWM 2000 IP68 for immersed
 DWM 2000 FT for food applications with

Special

 Rugged design, IP55 protection, equivalent to NEMA 4
 All wetted surfaces of ceramic, stainless steel and
 Compatible with process temperatures up to 150°C
 Suitable for operating pressures up to 25 bar

 No moving parts, maintenance
 Electronic unit replaceable without interruption of
 Compatible for al l pipelines with nominal diameter

 Readout connection possible with handheld consoles

system.

dia

meter or open

Tuchenhagen
instructions

Features

and

4X

standards.
platinum.
(300°F),

(DN)
(DWM

Measuring

If an electrical conductor moves through a magnetic field,
voltage,U, is induced in the conductor. In the case of
DWM, the liquid in the flow pipe is the electrical
In the diagram below, the DWM creates the magnetic
B, perpendicular to the direction of flow. The induced
ge U is directly proportional to the local flow velocity v.

U = k x B x v x D k - Instrument

Voltage U is tapped of f from the electrodes, neutral
ground electrode (connection
DWM 1000 Flow Switch - Voltage U is converted into a
switching signal with adjustable switching
DWM 2000 Flow Meter - Voltage U is converted into a
proportional output signal current between 4-20 mA
independant).

and ambient temperatures between - 25 à +

50mm

2000

Principle

channels.

connection (detailed in a separate

leaflet).

(2”).
only).

B - Strength of magnetic
v - Flow
D - Electrode

velocity

socket)

output/readout.

applications.

free.

constant

spacing

point.

(360psi).

field

60°C

flow.

the

conductor.

field,

volta-

and

flow-

(load

a

Components of DWM

1 Connection
2

Gasket

3

Sensor

4 Threaded Connection
5 Earthing
6 Earth Clamping
7 Cable Entry Gland M20x1.5
8

Housing

9 Blanking
10 Supply
11 Connection
12 Magnetic Coils and Electrode
13 Electronic
14 Cover
15 Cover With Fitted

Socket

Cable

Plug

Terminals

Unit

Screws

1000/2000

Strap

Chamber

Gasket

(1")

Contacts

4

M20 x 1.5

Installation

Mounting onto the

 The DWM should be mounted onto the pipeline (nominal diameter (DN) 50mm (2") by means of the connection socket

provided.

 Refer to the diagrams below for the orientation and positioning of the connection socket. The socket should be inserted as

far

as

depth of insertion so that the protrusion of the probe is 1/8 of the true internal diameter (i.e. not the

 The location hole in the pipeline should be drilled to a diameter of 39 mm (1.54") with a maximum of 0.5 mm play between

the

socket and bore. Secure the socket perpendicular to the pipe with four spot welds, then carry out an unbroken weld of the

entire

 The straight line flow distance required between the DWM and an upstream flow disturbance (inlet, pump, elbow etc) is

advised

 The DWM must be installed into the socket using the supplied gasket, which ensures water tightness and flush positioning of

the

ceramic probe head. Teflon tape should not be used on the thread as this insulates the required earthing contact, and

pre

vents from correct protrusion of the probe.

 Only the electronics unit must be rotated according to the flow direction (see “Electrical Connection and

pipeline

the corresponding pipeline diameter (DN) marking. In case there is pipe insulation, it is necessary to calculate

diameter, with an electrode of 1.2mm diameter and setting of 90 to

to be 10 x DN and 5 x DN from downstream

DN).

150A.

disturbances.

Setting”).

Installation on plastic p

In the case where the unit is to be installed on a plastic flow pipe, it is necessary to assure an earth connection. In all cases
KROHNE to ensure an effective

ipes

solution.

Welding
Socket

Correct

Incorrect

the

consult

Dimensions and Weight

Diecast aluminium housing - weight excluding socket approx. 1.85Kg

DWM1000
DWM2000

(4.08lbs)

5

Electrical Connection and Settings

Electrical

n The wiring terminals for the DWM can be found in the connection chamber (see page 3, item 11).

n The electrical connection conforms to the standard EN61010-1, protection class 1, voltage category II, interference degree
n

The DWM range conforms to EMC directives NF EN 50 081.1 (Emission) and NF EN 50 082.2

Connection

n For DWM 1000 see “ERRATA DWM 1000 Flow Switch”

DWM1000 Flow Switch

n Terminals 1 and 2 are used for the electrical connection

cross-section: max. 1.5mm2 or 16 AWG). Polarity is
ry.

n The flow switch must not be connected to power without

electrical load in series (e.g.

n The choice for the alarm status NO (circuit open for

higher than reference velocity) or NC (circuit open for
function) can be changed by the switching as detailed on
right.

n If more than one DWM1000 is used, make sure they are

connected in parallel. Only one common return is
Provide a separate fuse for each flow

n Ensure that the earthing of the unit is <10

PE

DWM
1000

Relay

Limits

n Always ensure that the voltage and relay voltage

with compatibility specifications. Refer to the
Relay’ section for the choice of relay on page 7.

Settings

The settings have to be carried out in the following
n Positioning of the electronic
n Setting of reference
n Setting of the time
n Setting of the alarm status: NO or

Open the housing and unscrew the two mounting screws
the electronic block (only two turns) without taking them
Position the block aligning the arrow with the direction of flow
the pipe (if not aligned false readings will occur). The block
then fixed by fully tightening the mounting

Setting of the Reference

Set the reference velocity with the two dials (11), one for
m/s units and the other for the 1/10ths

Setting of the Time

Set the time constant with the dial (12) to 5, 8 or 10
Depending on the desired function of the unit, program the
constant to the largest possible, to avoid unnecessary
ching during fluctuations in the flow

1

2

FE < 10 Ohms (Functional Earth for

relay)!

Protective

velocity.

constant.

Constant

Load e.g.

U: 48 - 240 V

block.

Velocity

NC.

rate.

switch.

Earth
Relay

units.

Ohms.

housing)

‘Compatible

screws.

(wire

arbitra-

velocit

inverse

allowed.

correspond

order:

(14)

seconds.

(Immunity)

Setting of the Alarm

The alarm status can be selected with the invertor
NO - circuit open for velocity higher than reference
NC - circuit closed for velocity higher than reference
The LED flashes when the circuit is

Status

open.

an

the
not

V<V

V>V

V<V

V>V

ref

ref

ref

ref

Make Contact Status (NO)

NO/NC Selector

NO

NO

Break Contact Status (NC)

NO/NC Selector

NC

NC

Internal

Switch

Internal

Switch

LED

LED

Reference
Dials for V

Mounting
Screws (14)

LED
(10)

Power
Terminals

of

out.

Installation on Piping With Cathodic

in

Please contact KROHNE directly for

is

Removal and Remounting of the Electronic

The electronic block may be removed in security during
conditions, as the probe is fully sealed. Before removing

the

unit ensure that the power supply is switched off. Unscrew
two mounting screws fully (14), and pull the block by means
the plastic
To replace the block, it should be orientated so that the
(14) engage into the threads of the rotating sleeve, and

time

in place with a few turns. Next orientate the block so that

swit-

arrow is in line with the flow direction, and lock the block by
tightening the mounting
Note - the replacement block needs to be

Velocity

ref

(9)

bridge.

(11)

Protection

instructions.

Block

screws.

calibrated.

Flashing

Time

(13).

velocity.

velocity.

Off

Flashing

Off

Constant

Dial

Selector

NO/NC

screws
secured

2. n

(12)

(13)

flow

the
the

of

the

fully

6

Electrical Connection and Settings

DWM2000 Flowmeter (current output)

The connection and settings have to be carried out in the
wing

order:
n Positioning of the electronic
n Setting of the full
n Electrical connection and earthing (must be <10
n Zero

adjustment.

scale.

block.

Ohms).

Positioning of the electronic

Open the housing and unscrew the two mounting screws (14)
the electronic block (only two turns) without taking them
Position the block aligning the arrow with the direction of flow
the pipe (if not aligned false readings will occur). The block
then fixed by fully tightening the mounting

Setting of the Full

The setting of the full scale has to be done before powering up
the DWM2000! Full scale range is from 1 through to 8m/s,
is set by means of the 1, 2, 4 and 8 value switches. The
value of the full scale is the sum of the switches activated.
switch has to be at the side of the inscription to be
If the full scale is set improperly (i.e. >8m/s), the device will
in alarm status (output current

Scale

block

<3mA).

screws.

activated.

Full

Scale
Range
Switch

Zero

Key

Mounting

Screws

Power

Terminals

Reminder for Flow Volume

V =

354

Q

2

D

Calculations:

V =

m/s
Q = m3/h
D = internal pipe diameter in

mm

Connection

n Power the unit with 24VDC (power terminals marked 11

follo-

and 12 (+)). Maximum wire diameter is
n The power consumption at 24VDC is 50mA (max at
n Power the current output with 24VDC (power terminals 6

and 5 (+)). Beware of polarity! Max. load is 500
n One power supply can be used to supply th e DWM2000

current output (see
n After powering the DWM2000 will do a self-test (1

during which current output will be in alarm state (<3mA).

the self-test is OK the DWM2000 will start measuring, if

of

the output will remain in alarm state

out.

in

Zero

is

Ensure that the pipe is full. There should be no flow velocity
the pipe. Press the “Zero” key. After 1 minute, the zero
will be automatically adjusted. During zero calibration, the
put indicates alarm status

and

final

Piping With Cathodic

The

Please contact KROHNE directly for

be

Removal and Remounting of the Electronic

The following procedure must be carried out by a qualified
nician:

The electronic block may be removed in security during
conditions, as the probe is fully sealed. Before removing
unit ensure that the power supply is switched off. Unscrew
two mounting screws fully (14), and pull the block by means
the plastic
To replace the block, it should be orientated so that the
(14) engage into the threads of the rotating sleeve, and
in place with a few turns. Next orientate the block so that
arrow is in line with the flow direction, and lock the block by
tightening the mounting

Electrical

Common Power Supply

(14)

Separate Power Supplies

Note: for Zone 2 applications, a fuse is required for the
positive (+) output with a rating

Adjustment

bridge.

Wiring

5 12

6

+

-

24 V DC
12 V DC (option)

6 5 12

- + +

-

+

24 V DC
12 V DC

(option)

diagram).

11

+

-

+

-

11

-

-

+
24 V

DC

12 V DC

Protection

screws.

(<3mA).

(option)

200mA.

1.5mm.

(<3mA).

instructions.

Block

FE < 10
Functional

FE < 10
Functional

Ohms.

Ohms

20°C)

Ohms

Earth

Earth

(-)

(-)

and

minute),

not,

setting

out-

tech-

flow

the
the

screws
secured

the

fully

If

in

of

7

Manufacturer

Reference

Power supply

(tested range)

SCHNEIDER

LC1K0610M7

230 VAC (+/- 10%)

Klöckner MOELLER

DILR40

230 VAC (+/- 10%)

Klöckner MOELLER

DILR22

230 VAC (+/- 10%)

SCHNEIDER

CA3KN40GD

125 VDC (+/- 20%)

DWM 1000 Compatible Relays

This list includes those relays tested by KROHNE, and is not exhaustive.

8

M20 x 1.5

DWM 2000 IP68

The version IP68 is supplied as a sealed unit, with all
carried ou t before delivery. The customer has to be aware
particular that the cable packing gland must not be opened as
is specially sealed according to

regulations.

Ensure to install the unit onto the flowpipe before connecting
cable, as the cable needs to be free during the rotation of
unit. The unit must be installed with the flow arrow marked
the top of the housing aligned with the flow in the

For the wiring of the versions IP68, see the two diagrams
showing the two options of a common or separate power
plies. The numbering corresponds to the following wire
11 - Brown; 12 - Red; 5 - Orange; 6 -

Yellow

For all electrical information refer to DWM2000 Technical
specifications on page

11.

The DWM 2000 IP68 can also be ordered with extended
as detailed below in the DWM 2000 L.

Wiring:

Common Power Supply

11 - brown; 12 - red; 5 - orange; 6 - yellow

11 -

12

5 +
6

+

-

VDC

Separate Power

11 -

12

+

5 +

-

6

pipe.

Supply

calibration

colours:

in

the
the

on

below,

sup-

Data

probe,

VDC

VDC

it

DWM 2000 L

Characteristics

Same characteristics as DWM2000 but adapted for the
fol

lowing special

n Velocity measurement in open channel. Combined with

sonic level measurement gives flow volume

n Flow control in pipes or open
n Spool piece mounting,
n Option: Hot-tap mounting, equipped with isolation
n Option: adjustable high pressure screw connection with

ty chain for mounting and

n Can be used instead of insertion turbines,
n Possibility to measure velocity at different points in open

nels, rivers

n Probe lengths up to 3m
n Easy to transport in order to carry out field
n Protection class
n Special option IP68 with submerged

Max Product Temperature: 150°C (IP55), 60°C
Max Operating Pressure: 25
Ambient Temperature Range: -25°C to +

etc.

conditions:

T-mounting.

dismounting.

possible.

IP55.

channels.

bar

measurement.

flow controllers.

tests.

converter.

60°C

valve.

(IP68)

ultra-

securi-

chan-

DWM 2000 L - Installation

9

A. Installation on Flow

n The straight line flow distance required between the DWM and an

tream flow disturbance (inlet, pump, elbow etc) is advised to be 10
DN and 5 x DN from downstream

n Position the pipe saddle or the welding socket as indicated in the

tallation

n Screw the ball valve ont o the welding socket (or connection

according to the saddle design). The valve thread is
n Ensure that the ball valve is
n Screw the adjustable fitting onto the ball
n Slide the DMW2000/L into the adjustable fitting to a depth of

60 et 75mm. This assures that the mounting will be
n The security chain is supplied to the required length as determined

each application. This length cannot be extended, but may be

ned where
n Loosen screw (No. 2 in sketch below) sligthly. This enables

DWM2000/L to be inserted further without any
n Open the ball
n Calculate the penetration length (= 1/8 DN Nominal Diameter) with a

tolerance of +2mm ­n If flow is heavily perturbated or the internal diameter is uncertain, it

advised to penetrate between 1/8 DN and 1/2
n Insert the DWM2000/L until measurement position is
n Take off the housing cover and turn the entire probe so that the

points in flow direction (this system differs from standard

1000/2000).
n Tighten alternatively the two screws (No.3 in sketch) up to max

to seal of f the fluid. Complete the installation by tightening

(No.2).

sketch.

necessary.

valve.

0mm.

Pipes

closed.

disturbances.

valve.

watertight.

leakage.

DN.

1''1/2.

reached.

between

Allen Sealing

Screws (3)

Probe (1)

Adjustable

Fitting (4)

max. pressure 25

B. Installation on Open

n The DWM2000/L can be mounted by using the adjustable
n Position the device in such a way that the arrow points in the

direction.

Channels

Remarks

n The electronics block of this long version is
n For safety reasons, keep the security chain mounted,

order to avoid any ejection in case of overpressure
the

n For range settings and electrical connection, refer to

standard version

pip e .

instructions.

Side Screw (2)

bar

interchangeable.

DWM2000

fitting.

flow

ups-

ins-

flange

for

shorte-

the

is

arrow

DWM

3N/m,
screw

in
in

x

Adjustable

Fitting

Welding

Socket

Installation on pipe saddle

Preferred mounting angle: horizontal

Installation with welding socket

Installation in an open channel

±45°

10

Trouble Shooting

Below is a list of possible problems, and the checks required for their resolution. In all cases ensure that the installa­tion instructions have been followed e.g. supply voltage, relay compatibility (DWM1000 only), earthing (<10 Ohms),
straight line flow distances, and flow in pipe is full.

DWM 1000

Fault: The relay does not switch according to reference velocity.

Checks Action
When the selector is inverted, does the relay If no, measure the consumption of the unit whilst the LED is
switch? illuminated. If i<5.5mA for DC (12 mA for AC), insert a resistor in

parallel with the relay coils of ratings 1, 3 or 10kOhms (5W)

corresponding to voltages 48, 110, and 230V respectively.
Advance the reference velocity from 0 m/s If no, and the LED changed state, replace the electronics unit.
through to 9m/s - does the relay switch? If yes, note the reference velocity value, and check this against

the real velocity.

Fault: The relay switches randomly.

Checks Action
Liquid heavily charged with particles? Flow Increase the time constant to 10s. If results are the same,
speed close to 0.1m/s? Straight line flow increase the reference velocity. If the results remain the
distances too short? Air bubbles in liquid same, insert a resistor in parallel with the relay coils of ratings 1,
(at high temperatures)? 3 or 10kOhms (5W) corresponding to voltages 48, 110, and

230V respectively.

DWM 2000

Fault: The output current is fixed at 0mA.

Checks Action
Output signal correctly powered? Refer to Technical Data specifications.
Polarity correct on supply connections? Refer to wiring diagrams.
Liquid inside the probe body? Contact KROHNE Service Department.

Fault: The pipe flow is higher than 0.1m/s and the output current remains at 4mA (+/- 0.02mA).

Checks Action
Orientation of the electronic unit correct? Loosen the fixing screws, and align the arrow with the pipe flow

Fault: The output current is fixed at below 3mA.

Checks Action
Power supply stable? (nominally +/-1%) Change power supply.
Current at 2.0mA? Reset the Full Scale switches to between 1 and 8m/s.
Current at 2.4mA? Zero setting too large - reset the zero with the pipe full and v=0

m/s.
For all other alarm output readings, contact KROHNE.

Fault: There is no flow in the pipe, and the output current is instable (4mA +/-1mA).

Checks Action
Is the output current stable when tested If no, trace and eliminate the interference source.
by a multi-meter?
Is the earth <10 Ohms? Establish a correct earthing point.

Fault: The output current is above 4mA, but the reading is incorrect.

Checks Action
Reading above 24mA? Ensure conformity to power supply specifications.
Fluctuations, but average reading correct? Increase the time constant value using the HHC2000 console.
Installation correct? Verifiy mounting specifications (probe penetration in pipe, right-

angles, orientation of electronic unit).
Pipe not full? Ensure that the pipe is full during flow conditions.
Speed/flow calculations correct? Check the internal diameter of the pipe and reset the Full Scale.
Is the output current correctly calibrated? Test the output current with the HHC2000 console.

DWM Technical Data

11

Power Supply and

Output

Voltage

Power

Consumption

Output

Functional Earth FE

(Protective)

DWM 1000 Flow Switch DWM 2000 Flow

Meter

Two Wire System Output Current 4 - 20 mA

48-240 , 50/60 Hz or 24 (20 to 30 )
48V (Terminals 1/2) Option: 12 (10 to 14 )
200mA max. 50 mA max. (at 24 and

20°C)

Break or make contact, switch selected Passive current output 4 - 20 mA
(for relay contact limits see (20 to 30 )
’Electrical Connection’).

Max. load:

500 Ohms for 24

200 Ohms for 12

<10 Ohms <10

Ohms

Protective earthing obligatory in connection

chamber

Full-Scale Range “v”

Adjustable

Reference velocity

between

0.1 and 9.9 m/s (0.3 and 32.5

ft/s)

Full scale 1, 2, 3, 4, 5, 6, 7or 8

m/s

(3.3, 6.6, 9.9, 13.1, 16.4, 19.6, 22.9 or

26.2

ft/s)

Time

Constant

choice of 5, 8 or 10

seconds

5 seconds

fixed

Operating

Data

Liquid
Electrical

Conductivity

Operating

Pressure

Process

Temperature

Ambient

Temperature

Largely homogeneous liquids, pastes and slurries, also with solids

content

ò20 µs/cm

(µmho/cm)

25 bar (360

psi)

- 25 to + 150° C (-13 to

+302°F)

- 25 to + 60° C(-13 to

+140°F)

Installation

Nominal Pipe Diameter

(DN)

Connection

Socket

Inlet / Outlet

Run

All DNs ò 50 mm

(2”)

Threaded G1A (R

1”)

10 x DN / 5 x

DN

Protection

Category

IP 55, Equivalent to NEMA 4 IP55 or

IP68

Local

Display

Flashing LED (DWM 1000

only)

Cable

Entry

M20 x 1.5

Power

Terminals

Max. wire diameter 1,5 mm

2

(16

AWG)

Error

Limits

v > 1 m/s (3.3

ft/s)

v < 1 m/s (3.3

ft/s)

Reproducibility

SP = Switching

Point
5% of SP
3 cm/s (1.2 inches/s) + 2% of SP

1% of Switching

Point

MV = Measured

Value
2% of MV
2 cm/s (0.79

inches/s)

+/- 1.5% of MV

Hysteresis

8% when decreasing

velocity

8% when decreasing

velocity

Interchangeability

In the case of a breakdown we advise a complete replacement of the DWM unit

in

order to preserve th e accuracy of the results. A change in the electronic

threshold

can induce errors of

<10%

Ex Versions Coding (on side

label)

Ex n R II T6...T3 X Zone

2

(according to IEC

79-15)

Materials:

Probe
Electrode
Housing

Connection Socket
Cable Entry Gland
Gaskets
Housing Cover
Ceramic Seal
Connection Socket

CrNi - Stainless Steel 1.4435 (SS 316 L - AISI) + ceramic insulation (zirconium

oxide)
Platinum
Diecast aluminium with epoxy

finish

Stainless Steel 1.4435 (SS 316 L -

AISI)

Nickel plated

brass

Buna

N
Viton
Klingerit (without

asbestos)

Austria
Krohne Ges.m.b.H.
Wagramerstrasse 81
Donauzentrum
A-1220 Wien
Tel. [phone]

2 03 23 28
Telex : 115 864
Fax : [phone]

Belgium
Krohne Belgium N.V.
Brusselstraat 320
B - 1702 Groot Bijgaarden
Tel. [phone]
Fax : [phone]

China
Kanex Krohne Beijing
Rm 830, Old Bldg, Xiyuan Hotel
Xi Jiao Er Li Gou Beijing, P.R. of China
Tel. [phone] Ex 5830
Telex : 22 831 XYHCN Ex 5830
Fax : [phone]

China
Kanex Krohne Shanghai
Room 928B, Jin Du Mansion
277 Wu Xing Road
Shanghai 200 233, P.R. of China
Tel. [phone]

Fax : [phone]
Cellphone : 0086-(0) 139 1721320

CIS + Baltic States
Kanex Krohne Engineering AG
Malay Bronnay, 26/3
103001 Moscow / Russia
Post Box 23
177071 Moscow / Russia
Tel. [phone]

Fax : [phone]

France
KROHNE S.A.
Usine des Ors - B.P. 98
26103 Romans Cedex
Tel. [phone]
Telex 345 153
Fax. [phone]

or 64675353

ou 203 0249

Krohne

S.A.
2, Allée des Ors - B.P. 98
26103 ROMANS

Cedex
Tél. : [phone]
Télex : 345

153

Télécopie : [phone]

Germany
Krohne Meßtechnik
GmbH & Co.KG
Postfach 10 08 62
D-47008 Duisburg
Ludwig-Krohne-Strasse 5
D-47058 Duisburg
Tel. [phone]
Telex : 17 203 301
Fax : [phone]

Great-Britain
Krohne Measurement & Control Ltd.
Rutherford Drive
Park Farm Industrial Estate
Wellingborough, Northants NN8 6AE
Tel. [phone]
Fax : [phone]

Hong Kong
Kanex Krohne Hong Kong Co.
Room 112, Tung Shun King Office
Center, 1st floor
N° 22 Chi Kiang Street
Tokwawan, Kowloon, Hong Kong
Tel. [phone]

or 236 301 11

Fax : [phone]

India
Krohne Marschall Pvt. Ltd
A-34/35, MIDC
Industrial Estate
“H”-Block, Pimpri
Poona 411018
Tel. [phone]
Telex : 0146-323 FSON

0146-221 JNMS

Fax : [phone]

Italy
Krohne Italia Srl
Via V. Monti 75
I-20145 Milano
Tel. [phone]
Fax : [phone]

Japan
Krohne Liaison Office
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Sous réserve de modifications pour raisons techniques. Printed in France

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DWM 1000

ERRATA

INFORMATION!

The data given on this errata sheet is applicable to DWM 1000 only.

Electromagnetic

Flow Switch

DWM 1000

ERRATA

Installation and Operating Instructions

For additional safety instructions about DWM 1000 devices, refer to page 5
Use one safety device per fuse (In = 100mA) in the power supply circuit. Use a switchgear device

(switch, circuit-breaker) to disconnect the signal converter adjacent to the device. Switchgear must
fully isolate the device (disconnect the 2 power lines), agree with the IEC 60947-1 and IEC 60947-3
standards and be identified as switchgear for this device.

Make sure that the electrical cable diameter is between 8 and 12 mm. Make sure that the cable gland
holds the cable tightly. Electrical cables must have a temperature rating that agrees with the operating
conditions.

Use a damp cloth to clean the device. Do not use aggressive or corrosive cleaning agents.

 Do not open the device when it is energized. There is a risk of injury or death from dangerous

voltages if you touch internal components after the device is connected to power supply. Do
not operate the device without its cover.

 De-energize the device and disconnect the power supply before you do work on the electrical

connections. Refer to the voltage data on the nameplate!

 The device must be grounded in accordance with regulations in order to protect personnel

against electric shocks.

 Obey the national regulations for electrical installations!

 Risk of injury (burns) to personnel who touch the device, depending on the environmental and

operating conditions.

 Obey fully the local occupational health and safety regulations. Only approved personnel can

do work on electrical components of the measuring device.

03/2012 – Errata– MA DWM 1000_2000 R01 en www.krohne.com