Wika Series dw User manual

INSTRUCTION MANUAL

NI-209WE

Rev. 8 12/16

DIFFERENTIAL PRESSURE SWITCHES SERIES DA & DW

All data, statements and recommendations supplied with this manual are based on information believed by us to be reliable. As the conditions of

effective use are beyond our control, our products are sold under the condition that the user himself evaluates such conditions before following our

recommendations for the purpose or use foreseen by him.

This document is the property of ALEXANDER WIEGAND SE &Co and may not be reproduced in any form, nor used for any purpose other than

that for which it is supplied.

WEATHERPROOF AND INTRINSICALLY SAFE: MODELS DW

FLAMEPROOF: MODELS DA

Versions: DW40, DW100 e DW160

Versions: DA40, DA100 e DA160

A Low pressure connection

B High pressure connection

C Cable entry VVents

Weight 6,2 kg (dimensions in mm)

A Low pressure connection

B High pressure connection

C Cable entry VVents

Weight 7,2 kg (dimensions in mm)

Versions: DW10

Versions: DA10

A Low pressure connection

B High pressure connection

C Cable entry

Weight 8,2 kg (dimensions in mm)

A Low pressure connection

B High pressure connection

C Cable entry

Weight 10 kg (dimensions in mm)

For surface mounting use four screws M6 .

NOTE: dimensions and weights are not binding unless released on certified drawings.

CAUTION

Before installing, using or carrying out maintenance on the instrument it is necessary to read and understand the indications given in

the attached Instruction Manual.

The instrument must only be installed and maintained by qualified personnel

INSTALLATION IS TO BE CARRIED OUT ONLY AFTER CHECKING THAT INSTRUMENT CHARACTERISTICS ARE

CONSISTENT WITH PROCESS AND PLANT REQUIREMENTS.

The functional features of the instrument and its degree of protection are shown on the identification plate fixed to the case.

CONTENTS:

1. GENERAL NOTES

2. OPERATING PRINCIPLE

3. MODEL CODE

4. IDENTIFICATION PLATE AND MARKINGS

5. SET POINT REGULATION

6. SET POIT CALIBRATION

7. MOUNTING AND CONNECTIONS

8. INSTRUMENT PLUMBING

9. SAFETY INTEGRITY LEVEL (SIL) INSTALLATION REQUIREMENTS

10. PUTTING INTO OPERATION

11. VISUAL INSPECTION

12. FUNCTIONAL VERIFICATION

13. STOPPING AND DISMOUNTING

14. DISPOSAL

15. TROUBLESHOOTING

SAFETY INSTRUCTIONS FOR USE IN HAZARDOUS ATMOSPHERES.

RECOMMENDATIONS FOR PRESSURE SWITCH SAFE USE.

Categories

according to

2014/34/EU

Directive (ATEX)

EPL

Gas, vapours, fog

Zone 0

Gas, vapours, fog

Zone 1

2G or 1G

Gb or Ga

Gas, vapours, fog

Zone 2

3G, 2G or 1G

Gc, Gb or Ga

Dust

Zone 20

Dust

Zone 21

2D or 1D

Db or Da

Dust

Zone 22

3D, 2D or 1D

Dc, Db or Da

5. SET POINT REGULATION

Each microswitch is independent and can be adjusted by means

of a screw (for adjustment) to snap when the pressure reaches

(increasing or decreasing) the desired value (set point). The

instrument is usually supplied with the switches adjusted at the

setting range value nearest to zero (factory calibration). The

instrument is supplied with a label showing the set point

calibration value. With factory calibration the values are not

indicated, as these are temporary and will be modified with the

definitive values. Prior to installation the instrument must be

calibrated and the definitive calibration values written on the

label.

If the instrument has been ordered with a specific calibration,

check the calibration values marked on the relevant label, prior

to installation.

The position of the adjustment screw is given in figure 2.

Fig. 2 - Electrical connections and adjustment screws

1 - Microswitch 2 set point calibration screw

2 - Microswitch 1 set point calibration screw

3 - Terminal block

4 - Electrical connection identification plate

Microswitch electrical circuit: State of the contacts at atmospheric

pressure

Designation of the contacts:

C - common

NA - Normally open

NC - Normally closed

The effect that the direction of rotation of the adjustment screw

has is described on the label.

6. SET POIT CALIBRATION

In order to proceed with the calibration and the periodical

functional verification of the instrument a suitable calibration

circuit (Fig. 3) and an adequate pressure source is required. The

test instrument shouldhave ameasurement range approximately

equal to or slightly wider than the pressure switch range and

should have an accuracy consistent with the accuracy required

to calibrate the set point.

INSTRUCTION MANUAL

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Rev. 8 12/16

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Fig. 3 - Calibration circuit

PS - Pressure switch

CA - Test gauge

V1 - Inlet valve

V2 - Discharge valve

P - Pressure source

Test fluid:

air for P < 10 bar

water for P > 10 bar

6.1PRELIMINARY OPERATIONS

6.1.1Weatherproof pressure switches (Models DW)

Remove the blocking device fixed to the side of the instrument

case and the adjustment screw access plate (Fig. 4). Remove

the cover by rotating it in an anticlockwise direction.

Fig. 4 - Weatherproof pressure switch blocking device

a) Plumbing wire

b) Plumbing

c) Blocking nut

c) Blocking bracket

e) Adjustment screw access

plate

6.1.2Flameproof pressure switches (Models DA)

CAUTION: do not open the cover of flameproof pressure

switches (Models DA) when energized, in explosive

atmospheres.

Loosen the locking headless screw situated on the cover using a

1,5 hexagonal key then unscrew the cover (fig.5). Remove the

internal blocking device inserted on the closure plugs and slide

out the plugs.

Fig. 5 - Flameproof pressure switch blocking device

6.2CALIBRATION CIRCUIT AND OPERATIONS

Prepare the calibration circuit as indicated in Fig.3.

The warning lamps should be connected to contact 1 or 2 in the

NO or NC position according to the required contact action.

Connection of C and NO terminals

• If the circuit is open at the working pressure, the switch closes

the circuit as the pressure increases when the desired value is

reached.

• If the circuit is closed at the working pressure, the switch opens

the circuit as the pressure decreases when the desired value is

reached.

Connection of C and NC terminals

• If thecircuit is closed atthe working pressure, theswitch opens

the circuit as the pressure increases when the desired value is

reached.

• If the circuit is open at the working pressure, the switch closes

the circuit as the pressure decreases when the desired value is

reached.

The pressure switch must be mounted in the normal installation

position, i.e. with the pressure connection pointing downwards.

Avoid forcing the elastic support of the microswitch by hand or

with tools. This could affect the instrument functioning.

CAUTION: if the switch is of the kind with adjustable dead band

(letter R in the contact codes) before proceeding with the

following operations it is necessary to proceed with the

adjustment of the dead band.

Increase the pressure in the circuit up to the desired set point

value for the first microswitch. Use a wide bladed screwdriver, as

indicated on the label, turn the screw until the relative lamp turns

on (or turns off).

- If the instrument is equipped with only one contact the

calibration is complete.

- If it is equipped with two contacts continue in the following

manner. Vary the pressure until the desired set point value for

the second microswitch is reached. Act on the adjustment screw

of the second contact.

Repeat calibrating operations on the first contact, then on the

second contact, until the required set point accuracy is obtained.

This is necessary due to the reciprocal influence which the

microswitches have on the sensitive element of the instrument.

CAUTION: if the two set point are different theymust be different

for much of 5% of the adjustable span.

6.3CHECK OF SET POINT

Generate the normal working pressure and wait the pressure

stabilisation. Vary the pressure into the circuit and record the set

point value. Write the set point values on the adhesive label.

Note: the repeatability should be checked verifying for three

times the set point (Pi) starting always from the same pressure

value (Pw). The pressure cycle should be slowly to give the

possibility to record the set point with accuracy.

6.4CALIBRATION CIRCUIT FOR INSTRUMENT WITH

ADJUSTABLE RANGE LESS TO 60 mbar

The calibration circuit used for the calibration of these

instruments must be:

- of big internal volume (5 liters or bigger) in order to reduce the

effect of volumetric variation (and therefore of pressure) caused

by the sensing element of the pressure switch during the snap

action.

- in a thermally stable place in order to guarantee stability to the

pressure inside the circuit used for the calibration.

Have to be considered that in a closed circuit with the internal

pressure equal to the atmospheric pressure, the variation of

temperature of 1°C causes in the circuit a pressure variation of

3,4 mbar.

The maximum inlet pressure must not exceed the lesser of

overpressure allowed by the pressure switch and the test gauge.

The test instrument should have a measurement range

approximately equal to or slightly wider than the pressure switch

range and should have an accuracy consistent with the accuracy

required to calibrate the set point.

For example DW10 range 0..16mbar the accuracy of the test

gauge must be ± 0,04 mbar to calibrate the set point with an

accuracy of ± 0,16 mbar (1% of the adjustable span).

INSTRUCTION MANUAL

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Rev. 8 12/16

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Fig. 6 –Calibration circuitfor instrumentwith adjustablerange less

than 60 mbar

1- Pressure switch

2- Test gauge

3- Inlet valve

4- Volumetric pump

5- Capacity

6- Outlet valve

6.5ADJUSTMENT OF DEAD BAND (LETTER R ON

THE MODEL CODE)

The dead band can be adjusted only on the instrument is

equipped with a microswitch, which allows adjusting (Letter R on

the model code). Adjustment may be obtained by rotating the

wheel placed on the microswitch (Fig. 7).

In order to carry out this operation it is advisable to use a blade

screwdriver.

Fig. 7 –Adjustment of dead band

Set point calibration screw

Dead band adjustment wheel

WARNING: rotate the wheel without pushing too much the blade

against it.

The instrument is normally delivered adjusted on the minmum

value of its range (factory calibration).

Calibration of dead band

The calibration of the dead band is obtained using the following

procedure:

1 - Raise pressure in the circuit until reaching the set point and

record its value (Pi).

2 - Reduce pressure in the circuit until reaching the reset point

and record its value (Pr).

3 - The difference Pi - Pr = Va represents the dead band factory

adjusted value.

4 - Rotate the adjustment wheel in the sense shown in Fig. 6

placing the red notch in horizontal position

5 - Repeat operations 1 and 2 and measure the new dead band

Vb.

6 - By comparingthe values Vaand Vb approximately determine

the color of the wheel notch to be placed on the mark.

7 - Place the notch and measure the obtained dead band.

8 - Proceed by successive approximations until reaching the

desired dead band value with enough accuracy.

9 - Then proceed with the set point calibration

Example: The dead band increase corresponding to the rotation

from A to B is given by: Vb - Va =I

The desired dead band V will be approximately in the position

indicated by the value

IVK 

which expresses:

- By units, the wheel notches (1=one black notch, 2=one red

notch, 3=one yellow notch, 4=one blue notch, 5=one green

notch, 6=two black notches).

- By decimal digits, the percentage middle position between

the located notch (of units) and the following one.

6.6FINAL OPERATIONS

Disconnect the instrument from the calibration circuit.

1.1.1 Weatherproof pressure switches (Models DW)

Take the cover, ensure that the sealing gasket is correctly fitted

into its seat, and insert the cover onto the case, with the blocking

gap positioned in correspondence to the blocking bracket.

Turn the cover clockwise closing it tightly. Mount the blocking

device as in Fig. 4. Mount on pressure connection and cable

entry the protection caps supplied with the instrument.

1.1.2 Flameproof pressure switches (Models DA).

Insert the closure plugs of the adjustment screw access holes,

block them using the internal device and if necessary seal them

with plumbing. Screw on the cover and block it using the

headless screw with which it is equipped (Fig. 5)

1.1.3 Final operations

Mount on pressure connection and cable entry the protection

caps supplied with the instrument.

Caution: The protection caps should only be definitively

removed during the connection steps (see § 7).

7. MOUNTING AND CONNECTIONS

7.1MOUNTING

Surface mount the instrument by means of the holes provided,

or pipe mount using the appropriate bracket (see Fig. 14,15 e

16). In case of surface or panel or rack mounting the instruments

can be mounted side by side (see Fig.19).

The chosen position must be such that vibrations, the possibility

of shocks ortemperature changes are within tolerable limits.With

gas or vapour process fluid, the instrument must be positioned

higher than the pipe inlet (see Fig.18). With a liquid process fluid,

the instrument can be positioned higher or lower, indifferently

(see Fig.17 e 18).

7.2INSTRUMENT WITH DIAPHRAGM SEALS

When the pressure switch is mounted on diaphragm seal with

capillary and the set point is less than 10 bar, the gap (distance

h) between one diaphragm seal and instrument or between the

two diaphragm seals generates a column of liquid, whose

pressure equivalent constitutes a drift of set point. The set point

has to be adjusted consequently.

7.3PRESSURE CONNECTIONS

Connecting lines are an integral part of the instrument in

transmitting the measured variable from the measuring point to

the instrument.

For a correct installation it is necessary to:

Mount a shut-off valve with drain (root valve) on each process

pipe inlet to allow the instrument to be excluded and the

connection tubing to be drained. It is recommended that said

valve has a capstan blocking device aimed at preventing it being

activated casually and without authorisation.

Mount a 3 valve manifold near the instrument to permit possible

functional verification on site and removal of the instrument. It is

recommended that the manifold is made up of two service valves,

one by-pass valve and two suitably connected drain plugs. The

three valves with the drains can be reunited by a single device

called a “Three valve manifold” (see fig.21 for flanged manifold

valve and fig.22 for direct manifold valve).

Mount a three piece joint onto the threaded attachment of the

instrument to permit the easy mounting or removal of the

instrument itself.

Carry out the connection using a flexible tube in such a way that

variations in the temperature of the tube itself do not force the

instrument attachment.

Ensure that all the pressure connections are airtight. It is

important that there are no leakage in the circuit.

Close root valves, the two service valves, drain plugs and open

the by-pass valve.

NOTE: if the instrument is used for level control in tanks under

pressure it is recommended that installation is carried out

according to the diagram in figure 23 and 24

In case of installation as per fig 23 ensuring that the seal pot B

has a sufficient capacity to maintain the liquid level at the

maximum height over time.

V = 5 l

INSTRUCTION MANUAL

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Rev. 8 12/16

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7.4INSTRUMENTS WITH PROCESS CONNECTION

COATED WITH PTFE

The pressure connection must be made in such a way that the

part protruding from the instrument have to be used as a sealing

ring.

Fig.8 - Instrument with process connection coated with PTFE

7.5ELECTRICAL CONNECTIONS

It is recommended to carry out the electrical connections

according to the applicable standards. In case of flameproof

instrument see also the Standard IEC-60079-14. If the electrical

connection is carried out in a protected tube, it shall be made so

that condensate is prevented from entering instrument enclosure

To guarantee the ingress protection IP66 and prevent loosening

of the blocking joint or cable glands, it is prescribed to seal the

threads with an anaerobic sealant. For example, use a sealant

like Loctite ® 542.

CAUTION: fittings used for the electrical connection of the

flameproof instruments shall be certified according theIEC or EN

standards and shall guarantee instrument degree of protection

(IP66).

In the case of Gk threads, this is made in accordance with

standard UNI-EN 60079-1 (Italian national variant).

The installation of the cable gland or three-piece joint should be

as per fig 9.

Fig. 9 –Installation of electrical connection

With the instrument into the final position provided that the

electric line is not energize, remove the cover and make the

electrical connection to the terminal block (see Fig. 2).

If the ambient temperature exceeds 60 °C is recommended to

use cables suitable foroperating temperatures of at least 105 °C.

Flexible cables with a maximum section of 1,5 mm2(16AWG) are

recommended using the pre-insulated crimp ring terminal.

Do not touch the adjustment screws and do not bend the

elastic microswitch supports in order to prevent the instrument

calibration being altered. Ensure that no deposits or wire ends

remain inside the case.

Warning: The instrumentmay be equipped with one or twomicro

switches SPDT type. All the electrical connection must be part of

intrinsically safe circuits. The relevant parameters for intrinsic

safety are listed on the nameplate of the instrument.

The tightening of the cable gland or the three-piece joint must be

performed as shown in Fig. 10.

Fig. 10 –Installation of the cable gland

As soon as connection steps are completed, mount the cover on

and make sure it is tight and blocked See fig 4 and 5.

7.5.1CONNETTOR 7 POLES TYPE MIL-5015 FOR WEATHER

PROOF INSTRUMENT

The free connector, supplied with the instrument, is able to

accept multicore cables with maximum outer diameter 11 mm. It

is recommended flexible cables with single-conductor with a

maximum section of 1.5 mm2 (16AWG).

The cable have to be prepared as per fig. 12

Fig. 12 –Cable preparation

A= 53mm

B= 30mm

C= 6,5 mm

The single stripped conductor has to be crimped with each

contact pin. For the electrical connections and for the assembly

follow Fig.13.

Fig. 13 –Free connector assembly

1- Cable

2- Heat Shrink Boot

3- Clamp

4- Extender

5- Ferrule

6- Insulator for pin

contacts

7- Pin contacts

8- Shell

The wiring diagram is according Fig.14.

Fig. 14 –Wiring diagram MIL C-5015

CONTACT

FUNCTION

1-NA

Micro 1: Normaly open

1-NC

Micro 1: Normaly closed

1-C

Micro 1: Common

2-NA

Micro 2: Normaly open

2-NC

Micro 2: Normaly closed

2-C

Micro 2: Common

Ground

Internal grounding connection

Once the crimping and assembly activities of the free connector

are finished, make sure that all the parts are tight. Screw the

INSTRUCTION MANUAL

NI-209WE

Rev. 8 12/16

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bayonet and tighten it to assure the instrument degree of

protection

7.6GROUNDING CONNECTIONS

The instrument is supplied with two grounding connections, one

external and one internal. The connections are suitable for a

earthing wires of 4 mm2section (fig. 2).

8. INSTRUMENT PLUMBING

Weatherproof pressure switches (Models DW)

The plumbing, aimed as a guarantee against possible tampering

of the calibration and electrical connections, can be carried out

using a flexible steel wire (a) inserted into the holes in the locking

nut (c) and the bracket (d) provided for this purpose (see Fig. 4).

Flameproof pressure switches (Models DA)

Plumbing is not necessary as the cover is blocked with a

headless screw, the closure plugs of the adjustment screw

access holes are blocked by means of the internal blocking

device and the instrument does not have to be opened when

installed (see Fig. 5).

9. SAFETY INTEGRITY LEVEL (SIL) INSTALLATION

REQUIREMENTS

The pressureswitch has been evaluated as TypeA safety related

hardware. It has an hardware fault tolerance of 0 if it is used in

one out one configuration (1oo1). The installation has to be

designed to allow a proof test to detect dangerous undetected

fault using, as example, the following procedure:

- Take appropriate action to avoid a false trip

- Force the switch to reach a define max or min threshold

value and verify that output goes into the safe state.

- Force the switch to reach a define normal threshold value

and verify that output goes into the normal state.

- Repeat the check two times evaluating average set point

value and repeatability,

- Restore the loop to full operation

- Restore normal operation

10. PUTTING INTO OPERATION

The instrument comes into operation as soon as the root valves

are opened and then, afterwards, the service valve attached to

the instrument + (H) inlet pipe is opened, the by-pass valve

closed and the service valve attached to the instrument –(L) inlet

pipe is opened. Any possible drainage of the connection tubing

can be carried out by opening the drains positioned on the

instrument.

Do not dispose of the process fluid into the environment, if this

can cause pollution or damage to people

NOTE: if the instrument is used for level control in tanks under

pressure and is installed according to the diagram in Fig. 23

proceed as follows:

Close the root valves V1 and V2 open the valves V3 V4 V5 (the

service and by-pass valves). Fill with the process fluid, from plug

S positioned on the seal pot B, bleeding air from the plug S

positioned on the seal pot near the V2 valve. Then close S and

top up the liquid in B. Remove air from the breather plug S+ and

S- positioned on the instrument, topping up the liquid in B. Close

the plug SB and the by-pass valve V5 and open the root valves

V1 and V2. The instrument is ready for use.

If the instrument is installed according to Fig. 24 close the

root valves V1, V2 and V5, open the valves V3 and V4. Open the

draining D. Fill with the process fluid, from plug B bleeding air

from the plug S+. Vent carried out, the instrument will read

pressure





• h1 corresponding to zero level in the vessel.

Close plugs S and D. First open valve V2 slowly, then V1. The

in-strument is ready to operate.

11. VISUAL INSPECTION

Periodically check the external condition of the enclosure. There

should be no trace of leakage of process fluid outside the

instrument.

In case of flameproof or intrinsic safety instruments, inspections

of the electrical installation are to be carried out also according

to customer procedures and at least in accordance with Standard

EN-60079-17.

The flameproof and the intrinsic safety instruments installed in

explosive atmospheres for the combustible dust presence, must

be periodically cleaned up externally in order to avoid dust

accumulating.

11.1INSTRUMENTS WITH PROCESS CONNECTION

COATED WITH PTFE

These instruments are usually installed on process with high

corrosion resistance requirements. To verify the condition of

PTFE the process connection is equipped with an inspection

hole. During the visual inspection check the absence of fluid. On

the contrary the instrument have to be replaced.

12. FUNCTIONAL VERIFICATION

This will be carried out according to the Customer’s control

procedures and because of their particular operating principle,

have to be functional inspected every year as minimum if used

as an alarm of max pressure

Models Dinstruments can be verified on the plant if installed as

illustrated in Fig. 17 or 18.

To avoid any risk it is recommended check the set point on site

without open the cover, without dismount the cable gland and

without unplugging the power cable.

The flameproof or intrinsic safety instruments may be checked

on site only if the apparatus used are suitable for explosive

atmosphere.

If this is not the case it is necessary remove the instrument from

the plant, and carry out the verification in a testing room.

If the verification of the set point is performed unplugging the

power cable from the terminal block it is recommended de-

energize the instrument to avoid any electrical hazard.

WARNING: Instrument models DA, flameproof.

Before open the cover or the cable gland check the absence of

explosive atmosphere and check that the instrument is not

energized.

Verification consists in check the calibration value and possibly

regulating the adjustment bush (see §5).

13. STOPPING AND DISMOUNTING

Before proceeding with these operations ensure that the plant or

machines have been put into the conditions foreseen to allow

these operations.

With reference to Figures 17 e 18

Remove the power supply (signal) from the electrical line. Close

the root valve (6) and open the drain. Remove the plug (2), open

the valve (3) and wait until the process fluid has drainedfrom the

tubing through the drain.

Do not dispose of the process fluid into the environment, if this

can cause pollution or damage to people.

Unscrew the three-piece joint (1).

WARNING: Instrument models DA, flameproof.

Before open the cover or the cable gland check the absence of

explosive atmosphere and check that the instrument is not

energized.

Unscrew the three-piece joint (11) (electrical cable tubing).

Remove the instrument cover and disconnect the electrical

cables from the terminal block and earth screws.

Remove the screws fixing the case to the panel (or pipe) and

remove the instrument, taking care to slide the electrical

conductors out from the case.

Mount instrument cover. Insulate and protect cables around, if

any. Temporarily plug pipes not connected to the instrument.

In case of flameproof instruments or intrinsic safetyit is

recommended to follow - at least –the standard IEC-60079-17

for the withdrawal from service of electrical apparatus.

14. DISPOSAL

The instruments are mainly made of stainless steel and

aluminium and therefore, once the electrical parts have been

dismounted and the parts coming into contact with fluids which

could be harmful to people or the environment have been

properly dealt with, they can be scrapped.

INSTRUCTION MANUAL

NI-209WE

Rev. 8 12/16

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15. TROUBLESHOOTING

IMPORTANT NOTE: operations involving replacement of essential components must be carried out at our workshop, especially for

instruments with flameproof certificate; this is to guarantee the user the total and correct restoration of the product original characteristics.

MALFUNCTION

PROBABLE CAUSE

REMEDY

Set point shift

Air bubbles in the connection lines (condensation in

the case of use of gas; excluding versions DW10

and DA10)

Solid particles deposited inside the measurement

chambers of the instrument (excluding versions

DW10 and DA10)

Permanent deformation of the sensitive element

due to fatigue or non-tolerated over-ranges

Variation of the elastic features of the sensitive

element due to its chemical corrosion.

Leakage of filling fluid (excluding versions DW10

and DA10).

Drain using the appropriate plugs

Dismount the measurement chambers and clean

them (during the mounting phase the screw locking

couple is 80 N/m)

Recalibrate or replace the sensitive element.

Recalibrate or replace the sensitive element with

another made of a suitable material. If necessary

apply a fluid separator

Send to the constructor for checking

Slow response

Clogged or obstructed connection line.

Root or service valve partially closed.

Too viscous fluid.

Check and clean line.

Open valve.

Provide instrument with suitable fluid separator.

No actuation or

undue actuation

Root or service valve closed.

By-pass valve open.

Microswitch contacts damaged.

Loosened electrical joints.

Interrupted or short-circuited electrical line.

Open the valve.

Close the valve.

Replace the microswitch.

Check all electrical joints.

Check the conditions of the electrical line.

Undue actuation

Accidental shocks or excessive mechanical

vibrations.

Modify the mounting.

Fig.14 –DW-DA –Mounting

of the brackets for 2” pipe

Fig.15 –DW10-DA10- Mounting

of the brackets for 2” pipe

Fig. 16 - Example of mounting

Wall installation

Installation on 2” pipe

INSTRUCTION MANUAL

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Rev. 8 12/16

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Fig. 17 - Example of connections -

Fig. 18 - Example of connections -

1 - Three pieces fitting

2 - Three valves manifold

3 - Three pieces fitting

4 - Piping

5 - Three pieces fitting

6 - Root valve with drain

7 - Filter or nozzle

8 - Check inlet and drain plug

9 - Blocking joint

10 - Curve

11 - Three pieces fitting

12 - M6 screws (N°4)

13 - Bracket for 2” pipe

14 - Vertical pipe

15 - Horizontal pipe

NOTE With gas or vapour process fluid, the instrument must be positioned higher than the pipe inlet (seeFig. 18). With a liquid process

fluid, the instrument can be positioned higher or lower, indifferently (see Fig. 17 e 18).

Fig. 19 - Rack mounting

Fig. 20 –Instrument with diaphragm seals version

DW496/DW197 and DA496/DA197

Fig. 21 –Mounting of flanged manifold valve

Fig. 22 –Mounting of direct manifold valve (½ G threads)

INSTRUCTION MANUAL

NI-209WE

Rev. 8 12/16

WIKA Alexander Wiegand SE & Co. KG

Alexander-Wiegand-Straße 30

63911 Klingenberg • Germany

Tel. +49 9372 132-0

Fax +49 9372 132-406

[email protected]

www.wika.de

Fig. 23 –Level control wet leg condition

Fig. 24 - Level control dry leg condition

Annex 1 –Model code

MODEL CODE

For further

information see

datasheet

1.1

Ignition protection mode

Weather proof

Ex d

1.2

Sensor code

Low differential pressure

Medium differential pressure

High differential pressure

1.3

Line (static) pressure

Max line pressure 10 bar

Max line pressure 40 bar

100

Max line pressure 100 bar

160

Max line pressure 160 bar

1.4

Electric Contacts

One

Two

1.5

Type of Electric Contact

Silver

Silver + Argon sealed

Gold

Gold + Argon sealed

Silver adjustable dead band

Options

Example: Intrinsic Safety execution

12/2018 WIKA based on 12/2016 CELLA

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