KROHNE DW 181 User guide

Installation and
operating instructions
DW 181 – 184
Standard, high-temperature,
tropical and ATEX versions
Flow switches
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2 Installation and operating instructions DW 181 - 184
Table of contents
General advice on safety…………………………………………………………………………..4
Standards / Approvals…………………………………………………………………………….. 4
Ex safety instructions………………………………………………………………………………4
Handling………………………………………………………………………………………………4
Product liability and warranty…………………………………………………………………….5
Items included with supply………………………………………………………………………..5
Documentation supplied………………………………………………………………………….. 5
Official approvals and certificates……………………………………………………………….5
Principle components……………………………………………………………………………...6
Equipment labels……………………………………………………………………………………7
Type code……………………………………………………………………………………………. 8
1Mechanical Installation………………………………………………………………………9
1.1 Positioning the flow switch…………………………………………………………………….9
1.2 Installation in hazardous areas (Ex applications)………………………………………….. 9
1.3 Connecting the DW 18 to the pipe……………………………………………………………9
1.4 Flow direction…………………………………………………………………………………...9
2Electrical Connections……………………………………………………………………..10
3Commissioning………………………………………………………………………………11
3.1 General notes………………………………………………………………………………… 11
3.2 Adjusting the limit switches - standard and EEx ia flow switch versions………………. 11
3.2.1 Type G indicator…………………………………………………………………………….11
3.2.2 Type A indicator………………………………………………………………………….....12
3.3 Adjusting the limit switches - EEx d flow switch version………………………………….12
3.3.1 MS 12/BRX switch………………………………………………………………………….12
4Display………………………………………………………………………………………...13
4.1 Local Flow indication………………………………………………………………………… 13
4.2 Limit Switches…………………………………………………………………………………13
4.3 EEx d version………………………………………………………………………………….14
4.4 High-temperature version (KROHNE temperature class H3, non-EEx)………………...15
4.5 Tropical version (non-EEx)…………………………………………………………………..15

Installation and operating instructions DW 181 - 184 3
5Service………………………………………………………………………………………...16
5.1 Maintenance………………………………………………………………………………….. 16
5.2 Exploded view of instruments………………………………………………………………. 16
5.3 Spare parts…………………………………………………………………………………….18
5.4 Inspection procedure………………………………………………………………………… 21
5.4.1 Inspection procedure: measuring assembly……………………………………………..21
5.4.2 Inspection procedure: housing (DW181 & DW182 models)…………………………...21
5.5 Basic servicing procedures…………………………………………………………………..22
5.5.1 Changing the position of the dial on the type A indicator……………………………… 22
5.5.2 Removing the display assembly: operating faults in the housing DW18x Std /EExia flow
controllers equipped with type G or A indicators……………………………………….. 23
5.5.3 Cleaning the springs or changing the measuring system sub-assembly……………..24
5.5.4 Changing gaskets in DW 183 flow controllers…………………………………………. 24
6Technical Data……………………………………………………………………………….25
6.1 Flow range table by flow range code……………………………………………………….28
6.2 Instrument version materials………………………………………………………………...30
7Dimensions and Weights…………………………………………………………………..31
8Measuring Principle…………………………………………………………………………36
8.1 Measuring systems…………………………………………………………………………...36
8.2 DW 183………………………………………………………………………………………...36
Appendix A: f you need to return a device for testing or repair to KROHNE.…………..37

4 Installation and operating instructions DW 181 - 184
General advice on safety
This manual gives a complete set of instructions for the installation, operation and
maintenance of the standard and ATEX versions of the DW 18 flow switches.
DW 18 flow switches must be used with liquids that do not have any gas pockets.
Special regulations are applicable to the use of equipment in hazardous locations,
and these are described in thisbooklet. Data is supplied on explosion protection.
Assembly, installation, commissioning and maintenance of equipment in
hazardous areas mustonly be carried out by qualified personnel with
relevant explosion protection training.
Standards / Approvals
DW 18 flow switches meet the protection requirements of Directive
89/336/EEC in conjunction with EN 50081-1 and EN 50082-2, and Directives
73/23/EEC and 93/68/EEC in conjunction with EN 61010-1, and also bear the
CE symbol.
These instruments, when ordered with the appropriate options, are certified for
use in hazardous locations by the INERIS certification agency under INERIS
03ATEX0045X. They respect the Health & Safety regulations in force by
conforming to EN 50014 (+ A1 & 2), EN 50018, EN 50020, EN50284, EN
50281-1-1 (+ A1) and EN 13463-1.
Ex safety instructions
The DW 18 flow switch series are suitable for monitoring flow of liquid in pipes in hazardous
areas. They may be approved for use in explosive atmospheres of all flammable substances in
Gas Group IIC in Zone 1 and applications requiring Category 2 equipment for EEx d applications
and Gas Group IIC in Zone 0 requiring Category 1 equipment with an intrinsically-safe power
supply for
EEx ia applications.
Ex Equipment Category Definitions
Category 1 G/D – instruments: for intrinsically-safe applications
The signal converter for the limit switch options and the measuring components are located in
hazardous areas requiring instruments qualified as being category 1. The G/D rating states that
the instrument is qualified for gas and dust environments. EEx ia-approved devices must be used
with a certified intrinsically-safe power supply.
Category 2 G/D – instruments: for applications using the EEx d-rated explosion-proof box
The signal converter for the limit switch options and the measuring components are located in
hazardous areas requiring instruments qualified as being category 2. The G/D rating states that
the instrument is qualified for gas and dust environments.
Handling
The device weighs between approx. 2 kg (4.5 lb) and 14 kg (30 lb). Carry using both hands to lift
the device carefully by the tube. If necessary, use lifting gear.
Avoid hard blows, jolts, impacts, etc. when handling the DW 18.

Installation and operating instructions DW 181 - 184 5
Product liability and warranty
The DW 18 flow meter is designed solely for measuring the flow rate of liquids without any gas
pocket. Special codes and regulations apply to its use in hazardous areas.
Responsibility as to suitability and intended use of these level gauges rests solely with the user.
Improper installation and operation of our level gauges may lead to loss of warranty.
In addition, the "General conditions of sale", forming the basis of the purchasing contract, are appli-
cable.
If you need to return the level gauge to the manufacturer or supplier, please refer to the information
given in Appendix B.
Items included with supply
The scope of supply encompasses, in the version ordered:
•Flow meter
Documentation supplied
•Installation and operating instructions (this manual) including description of special versions and
functions.
Official approvals and certificates
Application Approved by Instrument version Certification mark
ATEX certification
INERIS DW 18 TYPE 18. Certificate no.
INERIS 03ATEX0045X*
*This EC-type Examination Certificate is available in KROHNE’s download centre on
http://www.krohne.com/.

6 Installation and operating instructions DW 181 - 184
Principle components
DW 18 Standard or EEx ia version 1 Indicator type G (linear scale) or A
(dial)
2 Equipment label*
3 Flange (illustrated) or screwed
connection
4 Indicator cover locking pin
5 Flow direction arrow (DW183/4)
6 Wiring compartment cover
7 Gland (plugged)
8 Cable fitting (PG 13.5)
9 Measuring tube
DW 18 EEx d version 1 Equipment labels*
2 MS 12/BRX switch housing
3 Cable fitting (to be supplied by the
customer)
4 PE terminal
5 Flow direction arrow (on measuring
tube for DW181/2)
6 Socket set screw for adjusting
switch position
7 Pressure housing
8 Equipment dog-tag (tag no., etc.)
9 Screw-on connection
DW 18 HT (H3) version 1 Pressure housing
2 Switch sheathed in a PTFE
cartridge
3 Measuring tube
4 Electric cable in fibre glass
sheathing
5 MS 14 switch information label
6 Wiring box
7 Cable fitting (PG 9)
* Equipment labels shown on next page

Installation and operating instructions DW 181 - 184 7
Equipment labels
Standard label (all devices) 1 Designation code acc. to order
options list (e.g.V7BD1...)*
2 Type code
(e.g. DW181/C/011/B/G/KA/N/G1)**
3 Purchase order number
4 Factory serial number
5 Customer tag number
EEx ia supplementary information label (e.g. version K1 NO)
1 ATEX gas group and equipment
category (e.g. II 1 GD)
2 Year built
3 ATEX certification code
4 Electrical safety values
5 Wiring diagram
6 Protection concept & gas group +
sub-div. and temperature class (e.g.
EEx ia IIC T3...T6)
EEx d supplementary information label (e.g. version NC)
1 Limit switch code
2 ATEX certification code
3 Year built
4 ATEX gas group and equipment
category (e.g. II 1/2 GD)
5 Protection concept & gas group +
sub-div. and temperature class
(e.g. EEx d IIC T3...T6)
6 Factory serial number
7 Maximum switching capacity
8 Wiring diagram
* See DW 181-184 Data sheet for a list of order options and designation codes
** See type code definitions on the next page

8 Installation and operating instructions DW 181 - 184
Type code
Refer to the standard device label, item 2 on the previous page.
DW . . . / . / . . . . / . . / . / . . . / . . / . .
1 2 3 4 5 6 7 8
Type code element Code Code definition
1 Type series 181
182
183
184
For horizontal or vertical pipes, screw
connection G¾…G2, measuring system C or
E*
For horizontal or vertical pipes, flange
connection DN15…65 and ½”…2”-150 lbs,
measuring system C or E*
For horizontal or vertical pipes, flange
connections DN65…200 and 3”…8”-150 lbs,
measuring system P*
For horizontal pipes (DN ≥250 or 10”, mounting
flange DN150 PN16 or 6”-150 lbs, measuring
system P*
2 Measuring system C
E
P
Measuring disc in tapered tube
Nozzle with baffle
Baffle in constant diameter pipe
3 Code number 011 - 204 See section 7.1: Flow range table for the
characteristics of each code number.
4 Material of construction
- see also section 7.2 B RR
R
N
Bronze
Stainless steel (SS) 316 L
SS 316L measuring tube, steel connection
Steel
5 Indicator system G
A Linear scale marks Dial with flow units
6 Limit switches K1
K2
KV1
KV2
1 NC or 1 NO switch**
1 NC and 1 NO switch**
Amplifier relay: 1 change-over switch**
Amplifier relay: 2 change-over switches**
7 Application field N
Ex d
Ex ia
Normal locations
Hazardous locations
Intrinsically-safe applications
8 Connection G ¾…G2
DN15…200
(½”…8”)
Pipe thread
Flange connection
* Refer to section 9.1
** Bistable.
NO is a “normally open” switch during operation (closed switch when flow is decreasing)
NC is a “normally closed” switch during operation (closed switch when flow is increasing).

Installation and operating instructions DW 181 - 184 9
1 Mechanical Installation
1.1 Positioning the flow switch
No obstacles along the pipe within five diameters (D) upstream and two diameters downstream of
the instrument.
1.2 Installation in hazardous areas (Ex applications)
Read all instructions referring to flow switches in hazardous locations before installation.
Check that the flange, gasket and other materials in contact with the product are compatible. Refer
to the information given on the converter nameplate, the flange markings and specifications given
in the ATEX approval certificate.
1.3 Connecting the DW 18 to the pipe
•Before installation, clean the piping to remove any dust or weld debris.
•Fit the instrument on the pipe with the arrow on the housing pointing in the direction of flow.
•Flange connections: ensure that the gaskets are in place, flange facings are aligned and parallel
and that the bolts have been tightened with the amount of torque specified in European or local (if
outside the E.U.) standards.
1.4 Flow direction
The DW 183 and DW 184 can be installed in any position on the piping. However, the position of
installation and the flow direction must be indicated in the customer order (i.e. up, down, left to right
and right to left) as the weight of the baffle disc is taken into account when calibrating the
instrument. Flow direction must be indicated for DW 181 and DW 182 instruments equipped with
type A indicators.
The DW 184 is used for high-velocity or turbulent flows in pipes with diameters greater than
DN250. A special device, called a stilling well, is immersed in the liquid flow and channels the fluid
through a tube in which the disc moves, secured to the end of a rigid support. This reinforced pivot
enables the flow switch to be used in difficult conditions.
These instruments are only supplied with an index display (indicator type “G”) and switches. They
are not equipped with a graduated dial. The heights of the connection piece indicated for the
production of the mating flange must be respected.

10 Installation and operating instructions DW 181 - 184
2 Electrical Connections
Disconnect the power supply before opening the housing
Number
of
switches
Switch
types Limit switch adjustable over entire range
Type
K1
A
1
Type
K1
B
Type
K2
C
Type
K2
D
Type
K2
E
2
Type
K2
F
1 Type
KV1
G
1 Type
KV2
H
K1
+
K2
Change
over
(SPDT)
•The electrical connection
conforms to the standard
EN61010-1, protection
class 1 (for aluminium
housing) or class 2 (for
PVC housing), voltage
category III, and
interference degree 2.
•The DW range conforms
to EMC directives NF EN
50 081.1 (Emission) and
NF EN 50 082.2
(Immunity).
•It is obligatory to have a
switching or circuit
breaking device, following
present regulations. The
devices should completely
isolate the unit and be
easily accessible, close to
the unit.
•Both the live (L) and
neutral (N) wires should
be protected by a fuse
(4…6.3 A Time Lag).
During the wiring
procedure the ground wire
should always be
connected first (relevant
only for aluminium
housing).
•EEx ia versions must be
used with a certified
intrinsically-safe power
supply.
N.B. Use of the unit
outside the specifications
detailed in this manual can
compromise the safety
measures designed into the
unit. Always disconnect the
power supply before
accessing the terminals.

Installation and operating instructions DW 181 - 184 11
3 Commissioning
3.1 General notes
The flow switch is delivered pre-calibrated and ready for use. Open the valves slowly when starting
operation.
3.2 Adjusting the limit switches - standard and EEx ia flow switch versions
The limit switches can be adjusted individually over the entire measuring range. To adjust, remove
the locking pin securing the cap and remove the cap.
3.2.1 Type G indicator
The limit switch adjustment is indicated by a green strip (normally closed switch) or a black strip
(normally open switch) in a graduated window. For flow switches manufactured before September 1,
1991, the strips are red (normally closed switch) or orange (normally open switch).
Each graduation corresponds to 1/10 of the total measuring range, i.e. 35 l/h for a flow range of
50…400 l/h. This system enables the limit switch to be adjusted without having to circulate fluid in
the pipe. It is only necessary to adjust the micrometer screw (item 2) in order to move the switch
support (item 3) which has the coloured strip on its upper section.
“G” linear index indicator assembly
1 Index
2 Micrometer screw
3 Switch support
4 Switch
5 Control magnet
6 Following magnet

12 Installation and operating instructions DW 181 - 184
3.2.2 Type A indicator
The switch is adjusted by unlocking the adjustment screw (item 7) and repositioning the switch
support arm (item 8).
“A” graduated dial indicator assembly
1 Pointer
2 Dial
3 Following magnet
4 Control magnet
5 Mechanism
6 Switch
7 Adjustment screw
8 Switch support
3.3 Adjusting the limit switches - EEx d flow switch version
3.3.1 MS 12/BRX switch
The switch is adjusted by unscrewing the limit switch adjustment screw M8x10 (2) on top of the
pressure housing with a 4mm hexagon key. The switch (in its metal sheath) may then be
repositioned as required before retightening the screw. The original position is etched onto the
sheath.
MS 12/BRX switch assembly
1 MS 12/BRX switch
2 Limit switch adjustment
screw
3 Switch sheath
4 Switch magnet
5 Pressure housing

Installation and operating instructions DW 181 - 184 13
4 Display
4.1 Local Flow indication
Indicator “G” Indicator “A”
All flow switches can be equipped with
indicator G. Scale marks are from 1 to 10 to
allow visual control of the flow rate. The
switching point may be changed as and when
required.
The DW 181, DW 182 and DW 183 flow
switches up to meter size DN100 (4”) can be
supplied with indicator A. The dial is marked in
flow units (e.g. l/h, m³/h) to provide more
accurate flow readings. The switching points are
factory marked on the dial. With this indicator it
is also possible to adjust the switching points at
non-flowing conditions.
High-temperature versions are supplied without a local indicator.
4.2 Limit Switches
Every flow switch can be equipped with either one or two limit switches which can be adjusted over
the entire measurement range.
Limit switch specifications
Type and number of switches Switch rating
Standard
K1(K2) single (twin for K2) bi-stable limit switch 14VA max. (max. 350 V AC, max. 0.4 A)
reed type IA42 ATF 15-45
EExi safety values Ii < 500mA, Ci = 0 nF, Li = 0 µH
With change over
K1(K2) single (twin for K2) bi-stable limit switch 3 VA max. (max. 28 V DC, max. 0.25 A)
type reed CM21…
EExi safety values Ii< 500 mA, Ci= 0 nF, Li= 0 µH
With relay
KV1 (KV2) 2000 VA max. (max. 250 V AC, max. 8 A)
Power supply: 240/110/48/24 V AC (50/60 Hz)
110/48/24 V DC relay type Finder
Response time: 5…12ms
EEx d values See section 4.3: EEx d version
High-temperature version (non-EEx)
single bi-stable limit switch 18 VA max. (max. 220 V, max. 0.8 A) reed type IA13….
The switch ratings are given for standard resistance loads. Make sure you use the correct
protection circuits when using other types of load (e.g. inductive).

14 Installation and operating instructions DW 181 - 184
4.3 EEx d version
The MS 12/BRX (EEx d) switch features a flameproof aluminium enclosure. The limit switches are
type K1 and K2 bi-stable reed switches without changeovers or KV1 relays and are supplied
without a local display.
Approval EEx d IIC T6…T1
INERIS certificate 03 ATEX 0045X
Technical data
MS 12/BRX switch
Switches NC*** and NO****
Switch rating
K1, K2
(reed switch)
KV1
(relay)
14 VA (350 V AC;
0,25 mA
2000 VA (250 V AC;
8 A
Max. switching
capacity dissipated
by Ex d housing
20 VA; 1.5 A;
380 V AC
Ambient
temperature -40…+80°C or -40…+175°F
Process
temperature max. 150°C or max. 300°F*
Protection category
to EN 60529/NEMA
250
IP 65 / NEMA 6 when
T195…80°C or
T380…175°F*,**
Screw connection M20 x 1.5 without
cable entry fitting***
* T80…T195°C depending on the ambient
temperature and process temperature (see
section 7: Technical data).
**Maximum surface temperature of device.
***Optional: M25x1.5 or NPT ¾ threads

Installation and operating instructions DW 181 - 184 15
4.4 High-temperature version (KROHNE temperature class H3, non-EEx)
All DW 18 switches can be supplied for high-temperature service up to max. 300°C or 570°F but
without indicator.
The switches are located in a PTFE cartridge fastened directly to the measuring unit.
Sealing material:
DW 181 / DW 182 Klingerit (asbestos-free)
DW 183 / DW 184 Klingerit or fully welded (optional)
Cable connection (350 mm or 13 ¾ ”) to
aluminium terminal housing: fibre glass sheathing
Technical data
MS 14 (NC*** or NO****) switch
Max. switching
capacity 20 VA; 0,5 A; 250 V DC
Ambient temperature -25…+60°C or
-15…+140°F
Protection category
to EN 60529/IEC 529 IP 44
Cable fitting PG 9 (supplied)
*** NC: switch that is “normally closed” during operation (closed switch when flow is increasing)
**** NO: switch that is “normally open” during operation (closed switch when flow is decreasing)
4.5 Tropical version (non-EEx)
The flow switch junction boxes are equipped with an Amphenol socket outlet for use in tropical
climates. The matching plug is also supplied.
1-5 Terminals
6 Connecting plug
Switch used Terminals used Connection data
K1 1,2
4 For switch K1 For ground connection
K2 1,2
3,5
4
For switch K1
For switch K2
For ground connection
KV1 1,2
3,4,5 For power supply For change over (SPDT)

16 Installation and operating instructions DW 181 - 184
5 Service
5.1 Maintenance
In normal operation no maintenance is required. However, the flow switch must be cleaned if
particles in suspension in the liquid build up on the measuring mechanism.
Caution
Check that the cleaning product used will not chemically react with (i.e.
corrode) the component materials.
5.2 Exploded view of instruments
DW 183 Std / EEx ia DW 184 Std / EEx ia
52a Pressure resistant housing
52b PTFE ring
52c Washer
52d Tube
52e O-ring
53 Magnet lever with measuring disc
54 Measuring spring
55 Nut
56 Spring washer
57 Tubular body with collar and flanges
58 PTFE gasket
62a Pressure resistant housing
62b PTFE ring
62c Washer
62d Tube
62e O-ring
63a Measuring disc
63b Magnet lever
64 Measuring spring
65 Nut
66 Spring washer
67 Flange with stilling well
68 PTFE gasket
The parts listed above are not supplied separately. Please refer to section 5.3: Spare parts for
a list of available spare parts.

Installation and operating instructions DW 181 - 184 17
DW 182 (181) Std / EEx ia with indication G DW 182 (181) Std / EEx ia with indication A
DW 182 H3/K1 High-temperature version (Std)
9 Pressure resistant housing
10 O-ring
11 Magnet lever
12 Measuring spring complete
13 PTFE-ring
14 Measuring disc
15 Tubular body
17 Snap ring
18 Screw
48 Reed switch H3/K1
49 Mount
50 Nut
51 Hexagon socket head screw
The parts listed above are not supplied
separately. Please refer to section 5.3: Spare
parts for a list of available spare parts.

18 Installation and operating instructions DW 181 - 184
5.3 Spare parts
Measuring spring DW 181 / 182 "C"
Magnet lever (Tag 11)/ PTFE Ring (Tag 13)/ Measuring spring (Tag 12)/ Measuring disc (Tag 14)
DN N° Code DN N° Code
C011 XF71010100 C041 XF71010800
C012 XF71010200 C042 XF71010900
C013 XF71010300
DN40
C043 XF71011000
DN15
C014 XF71010400 C051 XF71011100
C021 XF71010500 C052 XF71011200
C022 XF71010600 C053 XF71011300
DN 25
C023 XF71010700
DN50
C054 XF71011400
Measuring spring DW 181 / 182 "E"
Magnet lever (Tag 11)/ PTFE Ring (Tag 13)/ Measuring spring (Tag 12)/ Measuring disc (Tag 14)
DN N° Code DN N° Code
E015 XF71011500 E045 XF71012300
E016 XF71011600 DN40 E046 XF71012400
E017 XF71011700 E055 XF71012500
E018 XF71011800 E056 XF71012600
DN15
E019 XF71011900
E025 XF71012000
E026 XF71012100
DN 25
E027 XF71012200
DN50
Measuring spring DW 183 (2 springs supplied – Tag 54)
Flow DirectionMeter code n° ↔ ↑ ↓
P081 XF71012700 XF71012800 XF71012900
P082 XF71013000 XF71013100 XF71013200
P083 XF71013300 XF71013400 XF71013500
P084 XF71013600 XF71013700 XF71013800
P085 XF71013900 XF71014000 XF71014100
P086 XF71014200 XF71014300 XF71014400
P087 XF71014500 XF71014600 XF71014700
P088 XF71014800 XF71014900 XF71015000
P089 XF71015100 XF71015200 XF71015300
P101 XF71015400 XF71015500 XF71015600
P102 XF71015700 XF71015800 XF71015900
P103 XF71016000 XF71016100 XF71016200
P104 XF71016300 XF71016400 XF71016400
P105 XF71016500 XF71016600
P106 XF71016700 XF71016800 XF71016900
P107 XF71017000 XF71017100 XF71017200
P108 XF71017300 XF71017400 XF71017500
P109 XF71017600 XF71017700 XF71017800
P121 XF71017900 XF71018000
P122 XF71018100 XF71018200 XF71018300
P123 XF71018400 XF71018500
P124 XF71018600 XF71018700 XF71018800
P125 XF71018900
P126 XF71019000 XF71019100
P127 XF71019200 XF71019300
P128 XF71019400 XF71019500 XF71019600
P129 XF71019700 XF71019800

Installation and operating instructions DW 181 - 184 19
Measuring spring DW 183 (2 springs supplied - Tag 54) continued from last page …
Meter code n° ↔ ↑ ↓
P151 XF71019900 XF71020000 XF71020100
P152 XF71020200 XF71020300 XF71020400
P153 XF71020500 XF71020600 XF71020700
P154 XF71020800 XF71020900 XF71021000
P155 XF71021100
P156 XF71021200 XF71021300 XF71021400
P157 XF71021500 XF71021600 XF71021700
P158 XF71021800 XF71021900 XF71022000
P159 XF71022100 XF71022200 XF71022300
P201 XF71022400 XF71022500 XF71022600
P202 XF71022700 XF71022800 XF71022900
P203 XF71023000 XF71023100
P204 XF71023200 XF71023300 XF71023400
P205 XF71023500 XF71023600 XF71023700
P206 XF71023800 XF71023900 XF71024000
Kit gasket DW 181 / 182
Tag Description Silicon code Viton code Perbunan code
2 O-ring D 88,49 X 3,53
8 O-ring 74 X 3 X 80 XF71030100 XF71030200 XF71030300
10 O-ring D 36,17 X 2,62
13 PTFE ring
Kit gasket DW 181…4 (ring for pressure resistant housing)
for special applications using DW 181…4 HT/H3 version
Description Code Description Code
PTFE XF71030400 Klingerit XF71030500
Pressure housing DW 181 / 182
Tag Description Standard code HT version code Ex version code
9 pressure housing
18 screw A2 70 CHC,
M6-20 DIN 912 XF71040100 XF71040200 XF71040300
16 nut A2 70 HM6
17 spring washer A4 W6
Reed switch "A" DW 181 / 182 / 183
Tag Description NO** code NC* code Changeover code
33 reed switch
32a nut A2 70H,M3
31 spring washer A2 M3 plate XF71050900 XF71051000 XF71051100
32 screw A2 70 H3-10 DIN933
30 clamp plate
Reed switch "G" DW 181 / 182 / 183
Tag Description NO** code NC* code Changeover code
34 reed switch G/K1
46 spring washer D5X9 XF71051200 XF710105300 XF71051400
47 snap ring AC E005 REF A
75 55
* NC: switch that is “normally closed” during operation (closed switch when flow is increasing)
** NO: switch that is “normally open” during operation (closed switch when flow is decreasing)

20 Installation and operating instructions DW 181 - 184
Complete plastic housing for ...
Code Description Code Description
XF71060100 DW18/AK1 green XF71062900 DW18/GKV1 24VAC
XF71060200 DW18/AK1 black XF71063000 DW18/GKV1 48VAC
XF71060300 DW18/AK1 "INV" XF71063100 DW18/GKV1 110VAC
XF71063200 DW18/GKV1 220VAC
XF71060400 DW18/AK2 green/green
XF71060500 DW18/AK2 black/black XF71063300 DW18/GKV1 24VDC
XF71060600 DW18/AK2 green/black XF71063400 DW18/GKV1 48VDC
XF71060700 DW18/AK2 black/green XF71063500 DW18/GKV1 110VDC
XF71060800 DW18/AKV1 24VAC XF71063600 DW18/GKV2 NC 24VAC
XF71060900 DW18/AKV148VAC XF71063700 DW18/GKV2 NC 48VAC
XF71061000 DW18/AKV1 110VAC XF71063800 DW18/GKV2 NC 110VAC
XF71061100 DW18/AKV1 220VAC XF71063900 DW18/GKV2 NC 220VAC
XF71061200 DW18/AKV1 24VDC
XF71061300 DW18/AKV1 48VDC XF71064000 DW18/GKV2 NC 24VDC
XF71061400 DW18/AKV1 110VDC XF71064100 DW18/GKV2 NC 48VDC
XF71064200 DW18/GKV2 NC 110VDC
XF71061500 DW18/AKV2 24VAC
XF71061600 DW18/AKV2 48VAC XF71064300 DW18/KV1/BRX NC 220V AC
XF71061700 DW18/AKV2 110VAC XF71064400 DW18/KV1/BRX NC 110V AC
XF71061800 DW18/AKV2 220VAC XF71064500 DW18/KV1/BRX NC 110V DC
XF71061900 DW18/AKV2 24VDC XF71064600 DW18/KV1/BRX NC 48V AC
XF71062000 DW18/AKV2 48VDC XF71064700 DW18/KV1/BRX NC 48V DC
XF710612100 DW18/AKV2 110VDC XF71064800 DW18/KV1/BRX NC 24V AC
XF71064900 DW18/KV1/BRX NC 24V DC
XF71062200 DW18/GK1 green
XF71062300 DW18/GK1 black XF71065000 DW18/KV1/BRX NO 220V AC
XF71062400 DW18/GK1 INV.yellow XF71065100 DW18/KV1/BRX NO 100V AC
XF71065200 DW18/KV1/BRX NO 110V DC
XF71062500 DW18/GK2 green/green XF71065300 DW18/KV1/BRX NO 48V AC
XF71062600 DW18/GK2 black/black XF71065400 DW18/KV1/BRX NO 48V DC
XF71062700 DW18/GK2 green/black XF71065500 DW18/KV1/BRX NO 24V AC
XF71062800 DW18/GK2 black/green XF71065600 DW18/KV1/BRX NO 24V DC
NC: switch that is “normally closed” during operation (closed switch when flow is increasing)
NO: switch that is “normally open” during operation (closed switch when flow is decreasing)
Kit indicator type A Kit indicator type G
Tags Description Code Tags Description Code
22…29 Indicator sub-
assembly (A) XF71065900 36…47 Indicator sub- assembly (A) XF71066000
Kit cap/cover DW 181/182/183
Tag Description Code
1 cap
2 O-ring Perb D 88,49 X 3,53 XF71070100
4 locking pin 316L for cover
5+6 gasket + cover + nut