WIKA Delta-comb, Delta-plus, Delta-switch Operating Instructions Manual

Model 851.02.100

Model 702.01.100 Model 702.02.100

sv

su st

Operating Instructions
Betriebsanleitung
Mode d'emploi

GB

D

F

Differential pressure gauges
Model 702.01.100, 702.02.100 and 851.02.100

Differenzdruckmessgeräte
Typ 702.01.100, 702.02.100 und 851.02.100

Manomètres pour pression différentielle
Type 702.01.100, 702.02.100 et 851.02.100

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WIKA Operating instructions DELTA-plus, DELTA-comb and DELTA-switch

GB

D

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Operating instructions
Model 702.01.100, 702.02.100 and 851.02.100 Page 1 - 10

Betriebsanleitung
Typ 702.01.100, 702.02.100 und 851.02.100 Seite 11 - 18

Mode d’emploi
Type 702.01.100, 702.02.100 et 851.02.100 Page 19 - 26

1. Safety instructions 4

2. General 4

3. Operating principle 4

4. Installation instructions 5

5. Measuring assembly 6

6. Comissioning 6

7. Options and accessories 8

8. Storage 10

9. Maintenance and servicing / cleaning 10

10. Repairs 10

11. Disposal 10

WIKA Operating instructions DELTA-plus, DELTA-comb and DELTA-switch

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Contents

Contents

WIKA Operating instructions DELTA-plus, DELTA-comb and DELTA-switch

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!

Caution

2122740.01

Illustration for example st

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1. Safety instructions ... 3. Operating principle

1. Safety instructions

The appropriate national safety regulations (i.e. VDE 0100 /
EN 60 079-14 / EN 837-2) must be observed when installing,

commissioning and operating these instruments.

Do not work on gauge while under voltage (applies to Model 702.02/03.100
and 851.02.100)

Serious injuries and/or damage can occur should the appropriate regulations
not be observed

Only appropriately qualified personnel should work on these instruments

2. General

These operating instructions are based on the following information:

EN 837-2: Selection and installation recommendations for pressure gauges
Data sheet PM 07.15: Differential pressure gauge with integrated working

pressure gauge

su Model 702.01.100

Data sheet PV 27.16: Differential pressure gauge with integrated working
pressure gauge and micro switch

T

Model 702.02.100
Data sheet PV 27.17: Differential pressure switch

sv

Model 851.02.100

3. Operating principle

The j and i measuring medium chambers
are separated by an elastic diaphragm.
The differential pressure causes an
axial movement (measured travel) in the
diaphragm against the measuring range
spring. The measured travel is proportional
to the differential pressure and is trans­mitted, „pressure sealed“ and with minimal
friction, via a connecting rod; for:

su to the movement
st to the movement

and in addition to the plungers
on the microswitches

sv to the plungers

on the microswitches

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WIKA Operating instructions DELTA-plus, DELTA-comb and DELTA-switch

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4. Installation instructions

4. Installation instructions

Installation of the differential pressure gauge should follow the installation
recommendations for pressure gauges according to EN 837-2 /7.

The maximum permissible medium / ambient temperature must not be
exceeded

Prior to the installation of the pressure gauge, the pipes should be
thoroughly cleaned by tapping, blowing or rinsing

The pressure gauges must be protected against contamination and high
temperature fluctuations!

The pressure gauges should be installed and operated such as to avoid
exposure to vibration. If the line to the pressure gauge is not robust enough
to prevent vibration it should be secured by means of brackets for wall
mounting.

Wall mounting

Installation using the three integral, cast mounting brackets

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2123541.01

WIKA Operating instructions DELTA-plus, DELTA-comb and DELTA-switch

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Contents of
tail pipe

Liquid media Gaseous media

Liquid Liquid with

vapour

Vapour
only

Gas only Wet gas Liquid gas

condensate

Typically

Condensate Boiling liquid LPG Dry air

Most air
Flue gas

Steam

Pressure
instrument
higher than
tapping point

Pressure
instrument
lower than
tapping point

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5. Measuring assembly

Proven measuring assemblies for various types of media. Recommended set­up for pressure measurement instruments are shown below.

5. Measuring assembly / 6. Commissioning

6. Commissioning

6.1 Mounting of the pressure connection

Pressure entries identified j and i j high pressure
i low pressure

6.2 Wiring details

(applies to Model 702.02.100 and 851.02.100)

The electrical connections should be made by qualified electricians

Connection details and switch functions are given on the instrument rating
plate. Connection terminals (1 ... 6) and the ground terminal are appropriately
marked.

The mains connection lines to be provided must be suitable for maximum
instrument power consumption and comply with IEC 227 or IEC 245

The instruments must be included in the equipotential bonding of the plant

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WIKA Operating instructions DELTA-plus, DELTA-comb and DELTA-switch

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st and sv:

Power ratings (see data sheet)

Precise wiring schemes can be seen in the following drawings.
In addition to the wiring details and required power supply are given on the type
plate.

Electrical connection is by means

of terminal box or L-plug per DIN 43 651

6. Commissioning

or electrical connection is by means

of cable gland and cable

2162679.01

M20 x 1,5

2157306.0X

Terminal box

850.33 2nd contact

850.3 1st contact

850.33

2nd contact

2162679.0X

2123568.0X

Cable gland
M20 x 1.5
with 1 m cable

850.3

1st contact

WIKA Operating instructions DELTA-plus, DELTA-comb and DELTA-switch

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Differential pressure
is zero

Differential pressure
is measured again

Released

Valve button

pushed

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6.3 Setting the switch point / checking the zero point

The switch points are set at the factory when the desired values are given. The
adjustment of the switch point is made by setpoint screws accessible from the
front. The assistant scales enable a relatively accurate adjustment of the switch
points over 270

p° and indicate the setpoint that is momentarily adjusted.

For contact re-adjustment the snap-fit window is to be lifted off using a screw
driver at the recess in the circumference. The desired switch point can be set
by turning the contact adjustment screws with a screw driver.

If a more accurate switch point adjustment is desired, a test variable should be
used.

Afterwards press the window back into the case.
To check zero point see below

7. Options and accessories

7.1 Integrated pressure equalising valve

The zero point check during the working
process is enabled by pushing the valve
button. The measuring medium flows from
the higher pressure side to the opposite
side and the differential pressure drops to
zero.

st and sv:

When the valve button is pushed, the differential pressure pointer must move
into the range of the zero point tolerance bar. As a consequence the function
of the instrument is in order. In the case of possible deviations beyond the
tolerance bar a zero point correction can be made via a standard integrated
adjustment pointer. For that purpose the snap-fit window
is to be lifted off using a screw driver at the impression/
recess in the circumference. The zero point is corrected
by turning the slotted screw at the adjustment pointer.
Afterwards the window is to be snap-fitted to the case
again. The differential pressure is indicated again, as soon
as the valve button is released.

6. Commissioning / 7. Options and accessories

Slotted
screw

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7. Options and accessories

7.2 Four-way valve manifold

Shut off j- and i process line for disassembling and testing of
measuring instrument without interrupting the process that is running.

Protect the instrument against inadmissible
overpressure loading, such as, for example, in
the case of pressure tests and undefined

operating conditions (also temporary shut down).

Pressure equalising for zero point check during
normal operation as well as equalisation of the
pressures at high pressure and low pressure
side during start-up and operation (with opened

pressure equalising valve).

Process line air bleeding for liquid measuring
media and purging the process line for removing

impurities.

7.2.1 Handling instructions

Work sequence to start measuring

1. Open pressure equalising valve (middle valve)

2. Open shut-off valve of the negative-pressure media chamber (

i right

valve) and the positive-pressure media chamber (

j left valve)

3. Close pressure equalising valve

Operating sequence for air bleeding/purging of piping

1. start: Open shut-off valve of the negative-pressure (

i) and positive-

pressure (

j) media chamber

Open pressure equalising valve and valve for purging or air bleeding

2. end: Close pressure equalising valve and valve for purging or air bleeding

Procedure at the end of the measuring operation
(also for partial system shut-down)

1. Open pressure equalising valve

2. Close shut-off valve of the negative-pressure (

i) and positive-pressure

(

j) media chamber

Task list for removing the transmitter during normal operation

1. Open pressure equalising valve

2. Close shut-off valve of the negative-pressure (

i) and positive-pressure

(

j) media chamber

3.

Open valve for purging or air bleeding

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Gauge valve,
low pressure
side i

Pressure
equalising valve

Gauge valve,
high pressure
side j

Valve for
purging or
air bleeding