WIKA PS-21, PS-20 Operating Instructions Manual

2301300.07 EN/DE/FR 12/2017

WIKA Alexander Wiegand SE & Co. KG

Alexander-Wiegand-Straße 30
63911 Klingenberg/Germany
Tel. [phone]
Fax [phone]
[e-mail]
www.wika.de

Operating instructions
Betriebsanleitung
Mode d’emploi

PS-20, PS-21

Electronic pressure switch
Elektronischer Druckschalter
Pressostat électronique

PS-21

PS-20

Current terms and conditions apply.
Details are available on ...

Es gelten unsere aktuellen Verkaufs­und Lieferbedingungen siehe unter ...

Toute commande est assujettie à nos conditions
de ventes et de fournitures dans leur dernière
version en vigueur, voir sous ...

www.wika.com

PS-20

2301300.07 EN/DE/FR 12/2017

2

WIKA Operating instructions / Betriebsanleitung / Mode d'emploi PS-20, PS-21

Contents Page 3-15 EN

1. Important details for your information

2. A quick overview for you

3. Signs, symbols and abbreviations

4. Function

5. For your safety

6. Packaging

7. Starting, operation

8. Maintenance, accessories

9. Trouble shooting

10. Storage, disposal
Programming 41
Configuration Software EasySwitch 42

Inhalt Seite 16-28 DE

1. Wichtiges zu Ihrer Information

2. Der schnelle Überblick für Sie

3. Zeichenerklärungen, Abkürzungen

4. Funktion

5. Zu Ihrer Sicherheit

6. Verpackung

7. Inbetriebnahme, Betrieb

8. Wartung, Zubehör

9. Störbeseitigung

10. Lagerung, Entsorgung
Programmierung 41
Konfigurationssoftware EasySwitch 42

Contenu Page 29-41 FR

1. Informations inportantes

2. Aperçu rapide

3. Explication des symboles,abréviations

4. Fonction

5. Pour votre sécurité

6. Emballage

7. Mise en service, exploitation

8. Entretien, accessoires

9. Elimination de perturbations

10. Stockage, mise au rebut
Programmation 41
Software de configuration EasySwitch 42

Contents / Inhalt / Contenu FREN DE

2301300.07 EN/DE/FR 12/2017

3 WIKA Operating instructions / Betriebsanleitung / Mode d'emploi PS-20, PS-21

1. Important details for your information / 2. A quick overview for you

EN

1. Important details for your information

Read these operating instructions before installing and starting the pressure switch.
Keep the operating instructions in a place that is accessible to all users at any time.
The following installation and operating instructions have been compiled by us with great care but it is not
feasible to take all possible applications into consideration. These installation and operation instructions
should meet the needs of most pressure measurement applications. If questions remain regarding a specific
application, you can obtain further information:

■

Via our Internet address www.wika.de / www.wika.com

■

The product data sheet is designated as PE 81.28

■

Contact WIKA for additional technical support [phone]

With special model number, e.g. PS-20000 or PS-21000, please note specifications in the delivery note. If the
serial number on the product label gets illegible (e.g. by mechanical damage or repainting), the retraceability
of the instrument is not possible any more.
WIKA pressure switches are carefully designed and manufactured using state-of-the-art technology. Every
component undergoes strict quality and environmental inspection before assembly and each instrument is
fully tested prior to shipment. Our environmental management system is certified to DIN EN ISO 14001.

Use of the product in accordance with the intended use PS-20, PS-21

Use the pressure switches to transform the pressure into an electrical signal.

Knowledge required

Install and start the pressure switch only if you are familiar with the relevant regulations and directives of your
country and if you have the qualification required. You have to be acquainted with the rules and regulations

on measurement and control technology and electric circuits. Depending on the operating conditions of your

application you have to have the corresponding knowledge, e.g. of aggressive media.

2. A quick overview for you

If you want to get a quick overview, read Chapters 3, 5, 7 and 10. There you will get some short safety
instructions and important information on your product and its starting. Read these chapters in any case.

2301300.07 EN/DE/FR 12/2017

4

WIKA Operating instructions / Betriebsanleitung / Mode d'emploi PS-20, PS-21

3. Signs, symbols and abbreviations / 4. Function

GB

3. Abbreviations, signs and symbols

4. Function

PS-20: Pressure connection with internal diaphragm(standard version).
PS-21: Pressure connection with flush diaphragm for highly viscous or solids entrained media which might

clog the pressure port.

Function

The pressure prevailing within the application is transformed into a sensor signal through the deflection of
the diaphragm, which acts on the sensor element with the power supply fed to the transmitter. This electric
signal changes in proportion to the pressure. The electrical signal on the switching output is changed when
reaching the preset switching point.

Potential danger of life or of
severe injuries.

Notice, important information,
malfunction.

The product complies with the
applicable European directives.

Potential danger of life or of
severe injuries due to catapulting
parts.

Potential danger of burns due to
hot surfaces.

!

Warning

Caution

Warning

2301300.07 EN/DE/FR 12/2017

5 WIKA Operating instructions / Betriebsanleitung / Mode d'emploi PS-20, PS-21

5. For your safety

5. For your safety

GB

■

Select the appropriate pressure switch with regard to scale range, performance and
specific measurement conditions prior to installing and starting the instrument.

■

Observe the relevant national regulations and observe the applicable standards and
directives for special applications (e.g. with dangerous media such as acetylene,
flammable gases or liquids and toxic gases or liquids and with refrigeration plants or
compressors). If you do not observe the appropriate regulations, serious injuries and/or
damage can occur!

■

Open pressure connections only after the system is without pressure!

■

Please make sure that the pressure switch is only used within the overload threshold limit all the time!

■

Observe the ambient and working conditions outlined in section 7 „Technical data”.

■

Observe the technical data for the use of the pressure switch in connection with aggressive / corrosive
media and for the avoidance of mechanical hazards.

■

Ensure that the pressure switch is only operated in accordance with the provisions i.e. as described in
the following instructions.

■

Do not interfere with or change the pressure switch in any other way than described in these operating
instructions.

■

Remove the pressure switch from service and mark it to prevent it from being used again accidentally, if
it becomes damaged or unsafe for operation

■

Take precautions with regard to remaining media in removed pressure switches.Remaining media in the
pressure port may be hazardous or toxic!

■

Have repairs performed by the manufacturer only.

!

Warning

2301300.07 EN/DE/FR 12/2017

6

WIKA Operating instructions / Betriebsanleitung / Mode d'emploi PS-20, PS-21

6. Packaging / 7. Starting, operation GB

6. Packaging

Has everything been supplied?

Check the scope of supply:

■

Completely assembled pressure switches; with flush version PS-20 including pre-assembled
sealings and protection cap.

■

Inspect the pressure switch for possible damage during transportation. Should there be any
obvious damage, inform the transport company and WIKA without delay.

■

Keep the packaging, as it offers optimal protection during transportation (e.g. changing installation
location, shipment for repair).

■

Ensure that the pressure connection thread and the connection contacts will not be damaged.

In order to protect the diaphragm, the pressure connection of the instrument PS-21 is provided with a special
protection cap.

■

Remove this protection cap only just before installing the pressure switch in order to prevent any
damage to the diaphragm or the thread.

■

Keep the protection cap of the pressure connection thread and the diaphragm for later storage or
transport.

■

Mount the protection cap when removing and transporting the instrument.

7. Starting, operation

Required tools: wrench (flats 27 or 41), screw driver

Diaphragm test for your safety

It is necessary that before starting the pressure transmitter you test the diaphragm visually, as this is a safety­relevant component.

■

Pay attention to any liquid leaking out, for this points to a diaphragm damage.

■

Check the diaphragm visually for any damage (PS-21).

■

Use the pressure switch only if the diaphragm is undamaged.

■

Use the pressure switch only if it is in a faultless condition as far as the safety-relevant
features are concerned.

!

Warning

2301300.07 EN/DE/FR 12/2017

7 WIKA Operating instructions / Betriebsanleitung / Mode d'emploi PS-20, PS-21

P #

S #

I

S

Code

7. Starting, operation

GB

Sealing

Mechanical connection

Product label (example)

Fill in switching points with a waterproof pen

Signal
Switching current
Order code
Serial No.
Product No.
PIN assignment

Coded manufacturer date
Switching point configurations
S1 = making contact SP with hysteresis
S2 = breaking contact SP with hysteresis
S1 = default: normally open
S2 = default: normally closed
Filter = attenuation of pressure spikes

2301300.07 EN/DE/FR 12/2017

8

WIKA Operating instructions / Betriebsanleitung / Mode d'emploi PS-20, PS-21

■

Connect the instrument to earth via the pressure connection.

■

The instrument must be grounded via the process connection!

■

The power supply for the pressure transmitter must be made via an energy-limited electrical circuit in
accordance with section 9.3 of UL/EN/IEC 61010-1, or an LPS to UL/EN/IEC 60950-1, or class 2 in
accordance with UL1310/UL1585 (NEC or CEC). The power supply must be suitable for operation above
2,000 m should the pressure transmitter be used at this altitude.

■

Ingress protection per IEC 60529 (The ingress protection classes specified only apply while the pressure
switch is connected with female connectors that provide the corresponding ingress protection).

■

Ensure that the cable diameter you select fits to the cable gland of the connector. Ensure that the cable
gland of the mounted connector is positioned correctly and that the sealings are available and undama­ged. Tighten the threaded connection and check the correct position of the sealings in order to ensure the
ingress protection.

■

Please make sure that the ends of cables with flying leads do not allow any ingress of moisture.

■

Don’t connect lines within a building which are longer than 30 m, or leave the building (including lines of
outdoor installations).

Electrical connection

7. Starting, operation

GB

■

Remove the protection cap only just before installation and absolutely avoid any damage to the
diaphragm during installation as well (PS-21).

■

For Model PS-20 you have to provide for a sealing element; exceptions are instruments with self-sealing
threads (e.g. NPT thread). For Model PS-21 the sealing ring is included in delivery.

■

Please refer to our data sheet “Pressure gauge sealing washers AC 09.08” in WIKA’s product catalog
Pressure and Temperature Measurement or our website www.wika.de for details about sealing washers.

■

When mounting the instrument, ensure that the sealing faces of the instrument and the measuring point
are clean and undamaged.

■

Screw in or unscrew the instrument only via the flats using a suitable tool and the prescribed torque. The
appropriate torque depends on the dimension of the pressure connection and on the sealing element
used (form/material). Do not use the case as working surface for screwing in or unscrewing the instru­ment.

■

When screwing the switch in, ensure that the threads are not jammed.

■

For tapped holes and welding sockets please see Technical Information IN 00.14 for download at www.
wika.de-Service

2301300.07 EN/DE/FR 12/2017

9 WIKA Operating instructions / Betriebsanleitung / Mode d'emploi PS-20, PS-21

configuration flying leads L-connector circular connector M12x1

Power supply (UB+) brown 1 1
0 V green 2 3
Switch 1 (S1) white 3 4
Switch 2 (S2) yellow - 5

7. Starting, operation

GB

Power supply

UB+ Positive supply / measurement connection S1 Switching output 1
OV Negative supply / measurement connection S2 Switching output 2
US+ Positive switching voltage supply connection

Load

A (PNP)

C (PNP/PNP)

Circular connector M12x1, 5-pin

2301300.07 EN/DE/FR 12/2017

10

WIKA Operating instructions / Betriebsanleitung / Mode d'emploi PS-20, PS-21

(D) Mounting hole

1. Loosen the screw (1).

2. Loosen the cable gland (2).

3. Pull the angle housing (5), with the
terminal block (6) inside, away from the
instrument.

4. Using the head of a small screwdriver in
the mounting hole (D), lever the terminal
block (6) out of the angle housing (5).
In order not to damage the sealing of the angle housing, do not try to push the terminal block (6) out
using the screw hole (1) or the cable gland (2).

5. Ensure that the conductor outer diameter you select is matched to the angle housing’s cable gland. Slide
the cable through the cable gland nut (2), washer (3), gland seal (4) and angle housing (5).

6. Connect the flying leads to the screw terminals on the terminal block (6) in accordance with the
pin-assignment drawing.

7. Press the terminal block (6) back into the angle housing (5).

8. Tighten the cable gland (2) around the cable. Make sure that the sealing isn’t damaged and that the
cable gland and seals are assembled correctly in order to ensure ingress protection.

9. Place the flat, square gasket over the connection pins on the top of the instrument housing.

10. Slide the terminal block (6) onto the connection pins.

11. Secure the angle housing (5) and terminal block (6) to the instrument with the screw (1).

Assembly of L-connector DIN EN 175301-803

(6)

(5)

(1)

(2)

(3)

(4)

Clamping nut,
Male connector,
Case with
pressure connection

Sealing

Female connector

7. Starting, operation

GB

2301300.07 EN/DE/FR 12/2017

11 WIKA Operating instructions / Betriebsanleitung / Mode d'emploi PS-20, PS-21

Specifications Model PS-20 / PS-21

Pressure ranges bar

0.25 0.4 0.6 1 1.6 2.5 4 6 10 16

Over pressure safety bar

2 2 4 5 10 10 17 35 35 80

Burst pressure bar

2.4 2.4 4.8 6 12 12 20.5 42 42 96

Pressure ranges bar

25 40 60 100 160 250 400 600 1000

1)

Over pressure safety bar

50 80 120 200 320 500 800 1200 1500

Burst pressure bar

96 400 550 800 1000 1200 1700

2)

2400

2)

3000

{Vacuum, gauge pressure, compound range, absolute pressure are available}

1)

Only model PS-20.

2)

For model PS-21: The value specific in the table applies only when sealing is

realised with the sealing ring underneath the hex. Otherwise max. 1500. bar applies.
Materials
Wetted parts
Model PS-20

*)

Stainless steel

Model PS-21 Stainless steel {Hastelloy}

O-Ring: NBR {FPM/FKM or EPDM}
Case Stainless steel
Internal transmission fluid 3) Synthetic oil {Halocarbon oil for oxygen applications}

3) Not for model PS-20 with pressure ranges > 25 bar.

Power supply U

B

UB in VDC 10 (12) < UB ≤ 30 (using the programming module)
Type of switch A C
Number of switching points 1 2
Switching current (max. DC 30 V) 4 2
Mode of connection PNP PNP/PNP
Switch
Function NC or NO

■

Adjustment of switching points % of span 0 ... 100

■

Switching hysteresis % of span 1 ... 99

■

Switching window % of span 0 ... 100

■

Default values low / high are set at latest 20 ms after the instrument has been switched on

4)

4)

This guarantees a clear definition of the switching state, when the instrument is

switching on within the hysteresis pressure range.

7. Starting, operation

GB

2301300.07 EN/DE/FR 12/2017

12

WIKA Operating instructions / Betriebsanleitung / Mode d'emploi PS-20, PS-21

Specifications Model PS-20 / PS-21

■

Damping ms 0 ... 500

■

Manufacturer‘s settings when selected via the software the manufacturer‘s values are activated

■

Switching time ms < 6

Insulation voltage VDC 500
Accuracy adjustment of switching

points

6)

% of span ≤ 0.5 (BFSL)

≤ 1.0

5)

5) Including non-linearity, hysteresis, zero point and full scale error (corresponds to
error of measurement per IEC 61298-2).
Adjusted in vertical mounting position with lower pressure connection.

6) In individual cases equipment exposed to strong electromagnetic fields with

frequencies up to 2.7 GHz may show increased measurement errors of up to 3 %.
To avoid such influences on the measurement signal do not operate the equipment
in proximity to strong transmitters or radio installations, or use suitable sheath
current filters.

Non-repeatability % of span ≤ 0.25
1-year stability % of span ≤ 0.2 (at reference conditions)
Permissible temperature ranges

■

Medium *) -30 … +100 °C {-40 … +125 °C} -22 ... +212 °F {-40 … +257 °F}

■

Ambient -20 ... +80 °C -4 ... +176 °F

■

Storage -40 ... +100 °C -40 ... +212 °F
Compensated temp. range 0 ... +80 °C +32 ... +176 °F
Temperature coefficients in

compensated temp. range

■

Mean TC of zero % of span ≤ 1.0

■

Mean TC of span % of span ≤ 1.0
CE- conformitiy

■

Pressure equipment directive

■

EMC directive

EN 61326 Emission (Group 1, Class B) and Immunity (industrial
locations)

7. Starting, operation

GB

2301300.07 EN/DE/FR 12/2017

13 WIKA Operating instructions / Betriebsanleitung / Mode d'emploi PS-20, PS-21

Specifications Model PS-20 / PS-21

Shock resistance g 500 according to IEC 60068-2-27 (mechanical shock)
Vibration resistance g 15 according to IEC 60068-2-26 (vibration under resonance)
Wiring protection

■

Short-circuit proofness Sig+ towards U

B-

■

Reverse polarity protection UB+ towards U

B-

■

Overvoltage protection VDC 36
Weight kg Approx. 0.2

*) In an oxygen version model PS-21 is not available. In an oxygen version model PS-20 is only available with media temperatures between -4 … +140 °F / -20 … +60 °C and
using stainless steel or Elgiloy® wetted parts.
{ } Items in curved brackets are optional extras for additional price.

Functional test

■

Open pressure connections only after the system is without pressure!

■

Observe the ambient and working conditions outlined in section 7 „Technical data".

■

Please make sure that the pressure switch is only used within the overload threshold
limit at all times!

When touching the pressure switch, keep in mind that the surfaces of the instrument
components might get hot during operation.

When designing your plant, take into account that the stated values (e.g.burst pressure, over pressure
safety) apply depending on the material, thread and sealing element used.

7. Starting, operation

GB

Warning

Caution

2301300.07 EN/DE/FR 12/2017

14

WIKA Operating instructions / Betriebsanleitung / Mode d'emploi PS-20, PS-21

8. Maintenance, accessories / 9. Trouble shooting

GB

8. Maintenance, accessories

Accessories

For details about the accessories (e. g. connectors), please refer to WIKA‘s price list, WIKA‘s product catalog
on CD or or contact our sales department.

9. Trouble shooting

Open pressure connections only after the system is without pressure!

■

WIKA pressure switches require no maintenance.

■

Have repairs performed by the manufacturer only.

Do not insert any pointed or hard objects into the pressure port for cleaning to prevent damage to the
diaphragm of the pressure connection.

■

Take precautions with regard to remaining media in removed pressure switches.
Remaining media in the pressure port may be hazardous or toxic!

■

Remove the pressure switch from service and mark it to prevent it from being used
again accidentally, if it becomes damaged or unsafe for operation.

■

Have repairs performed by the manufacturer only.

Warning

!

Warning

2301300.07 EN/DE/FR 12/2017

15 WIKA Operating instructions / Betriebsanleitung / Mode d'emploi PS-20, PS-21

If the problem persists, contact our sales department.
USA, Canada
If the problem continues, contact WIKA or an authorized agent for assistance. If the pressure switch must be
returned obtain an RMA (return material authorization) number and shipping instructions from the place of
purchase. Be sure to include detailed information about the problem. Pressure switches received by WIKA
without a valid RMA number will not be accepted.
Process material certificate (Contamination declaration for returned goods)
Purge / clean dismounted instruments before returning them in order to protect our employees and the
environment from any hazard caused by adherent remaining media.
Service of instruments can only take place safely when a Product Return Form has been submitted and
fully filled-in. This Return Form contains information on all materials with which the instrument has come into
contact, either through installation, test purposes, or cleaning. You can find the Product Return Form on our
internet site (www.wika.de / www.wika.com).

9. Trouble shooting / 10. Storage, disposal

GB

10. Storage, disposal

When storing or disposing of the pressure switch, take precautions with regard to remai­ning media in removed pressure switches. We recommend cleaning the switch properly
and carefully. Remaining media in the pressure port may be hazardous or toxic!

Mount the protection cap when storing the pressure transmitter in order to prevent any damage to the
diaphragm (PS-21).

Dispose of instrument components and packaging materials in accordance with the respective waste
treatment and disposal regulations of the region or country to which the instrument is supplied.

Storage

Disposal

WIKA reserves the right to alter these technical specifications.

!

Warning