WIKA 891.34 Manual de usuario

Testing Instructions

Prüfanleitung

Instructions de vérification

Instrucciones

Pressure Gauges

Mechanische Druckmessgeräte

Manomètres mécaniques

Manómetros mecánicos

Examples/Beispiele/Exemples/Ejemplos

2061744 09/2009 GB/D/F/E

WIKA Testing Instructions for Pressure Gauges

Testing Instructions for Pressure Gauges Page 3-8

Prüfanleitung für mechanische Druckmessgeräte Seite 9-14

Instructions de vérification pour Manomètres mécaniques

Page 15-20

Instrucciones para Manómetros mecánicos Página 21-26

1. Safety instructions 4

2. Testing the display 4

2.1 Process for display testing 5

3. Testing of switch contacts 6

4. Testing for transmitters 8

5. Repairs 8

WIKA Testing Instructions for Pressure Gauges 3

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Contents

Caution

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WIKA Testing Instructions for Pressure Gauges

1. Safety instructions / 2. Testing the display

1. Safety instructions

The appropriate national safety regulations (i.e. VDE 0100 /

EN 837-2) must be observed when installing, commissioning and

operating these instruments.

Only appropriately qualified personnel should work on these instruments

Pressure gauges may only be removed once they are free from pressure

Any residual pressure medium contained in the pressure element may be

hazardous or toxic. This should be taken into account when handling and

storing pressure gauges which have been removed.

Serious injuries and/or damage can occur should the appropriate regulations

not be observed

2. Testing the display

Basic testing principles

The accuracy class is tested in accordance with EN 837

The display is always tested in accordance with the operational error limit

The test is carried out with rising and falling pressure. With gauges that have

a free zero point the lower limit and the upper limit of the scale range are

used as the measuring points.

The pressure gauge used as a measuring standard must be at least four

times as accurate as the device to be tested:

e.g.: Device under test = Class 1.6 ⇒Test variable ≤Class 0.25

The measured values indicated are recorded after gently knocking on the

case

For pressure gauges with electrical alarm contacts, the set point indicator(s)

should be set so that any load on the actual value pointer is eliminated as

far as possible. The test of the scale range when the alarm contacts are

change-over contacts is carried out with the contacts at 12 o‘clock (both

contact arms load the actual value pointer).



WIKA Testing Instructions for Pressure Gauges 5

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Examples of the calculation of the permissible deviation

(linearity and hysteresis):

Scale range: 0 ... 10 bar (measuring span = 10 bar)

Class 1.6 (error limit = 1.6 %)

Permissible deviation: = ± 0.16 bar

Scale range: -1 ... +25 bar (measuring span = 26 bar)

Class 1.0 (error limit = 1.0 %)

Permissible deviation: = ± 0,26 bar

2.1 Process for display testing

The accuracy class is always determined at the reference standard, i.e. the

measuring point to be tested must be generated at the test specimen and the

deviation of the value measured at the measuring point is to be recorded from

at the reference standard.

The following test features must always be tested prior to the actual display

testing:

Pointer movement (smooth)

Zero error (after running through the entire scale range)

Static pressure test (differential pressure gauges) with a pressure load of the

max. overload capacity:

The zero error must not exceed the operational error limit.

Free movement of the pointer beyond the upper limit of the scale range,

however up to a max. of the 6 o'clock position.



2. Testing the display

Pressure gauge

Class

Error limit Number of measuring

points

0.1 0.1 % at least 10

0.2 0.2 % at least 10

0.3 0.3 % at least 10

0.6 0.6 % at least 10

1.0 1.0 % at least 5

1.6 1.6 % at least 5

2.5 2.5 % at least 5

4.0 4.0 % at least 5

Error limits for the display (per EN 873-1 / EN 837-3)

10 x 1.6

100

26 x 1.0

100

1. 2.

3. 4.

1. 2.

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WIKA Testing Instructions for Pressure Gauges

3. Testing of switch contacts

Basic testing principles

The correct pin assignment and the permissible contact rating must be taken

from the product label on the exterior of the housing.

Versions

Switch contacts are classified as follows:

Sliding contacts Model 811

Magnetic snap-action contacts Model 821

Inductive contacts Model 831

Fail-safe inductive contacts Model 831 SN and 831 S1N

(special designs)

The design and construction of these switch contacts and their function are

described in Data Sheet AC 08.01 "Electrical Switch Contacts".

Contact function index

The contact function is indicated in the clockwise direction of the instrument

pointer rotation. The contact function is indicated by a code to the right of the

full stop which follows the respective model code, e.g. 821.2. The contact type

(single - double - triple contact) can be seen from the number of indices which

follow the corresponding model code, e.g. 821.212 = triple inductive contact.



2. Testing of the display / 3. Testing of the switch contacts

Examples of the measured value registration:

Scale: 0 ... 10 bar Scale: -1 bar ... +10 bar

Measu- Rising Falling Measu- Rising Falling

ring point pressure pressure ring point pressure pressure

1. 0 bar 0 bar 8. -1 bar -1 bar

2. 2 bar 2 bar 7. -0.5 bar -0.5 bar

3. 4 bar 4 bar 1. 0 bar 0 bar

4. 6 bar 6 bar 2. 2 bar 2 bar

5. 8 bar 8 bar 3. 4 bar 4 bar

6. 10 bar 10 bar 4. 6 bar 6 bar

5. 8 bar 8 bar

6. 10 bar 10 bar

WIKA Testing Instructions for Pressure Gauges 7

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Meaning of the codes

Index 1: Contact makes when the instrument pointer approaches

the set point in a clockwise direction ⇒NO contact

Index 2: Contact breaks when the instrument pointer approaches

the set point in a clockwise direction ⇒NC contact

Index 3: Contact breaks one circuit and makes a second circuit when the

instrument pointer approaches the set point in clockwise

direction ⇒SPDT contact. (not with Model 831)

Example of the contact model, contact type and function index

Model 821. 21 2 means:

821. = Magnetic snap-action contact

21 2 = Triple inductive contact (because of 3 digits)

2 = 1st contact breaks when pointer reaches set point (NC)

1 = 2nd contact makes when pointer reaches set point (NO)

2 = 3rd contact breaks when pointer reaches set point (NC)

Contact accuracy

The accuracy of the contacts is tested in accordance with EN 837 and DIN

16 085. The contacts are generally tested in ranges of 25 %, 50 % and 75 %

of the full scale value, provided that no other values or switching points are

specified.

Error limits

The deviation of the switching point from the set limit value must not exceed

the 1.5-fold value of the error limit of the pressure gauge.

The switching hysteresis may be:

With sliding contacts: max. 1 %

With magnetic snap-action contacts: between 2 % and 5 %

With inductive contacts: max. 1 %

of the measuring span.



3. Testing of switch contacts

10 x 1.6

100

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WIKA Testing Instructions for Pressure Gauges

4. Testing for transmitters / 5. Repairs

4. Testing for transmitters

Transmitter versions

Standard Model 891.34

Ex-version Model 892.34

The design and construction of the transmitters and their function is described

in Data Sheet AC 08.02 "Transmitters to combine with pressure gauges" and

the operating instructions are included with the instrument.

Connection details

2-wire 4 ... 20 mA

Clip 1: Earth power supply / earth signal

Clip 2: Power supply 10 ... 30 V / plus signal

Clip 3: Test minus

Clip 4: Test plus

3-wire 0 ... 20 mA

Clip 1: Earth power supply / earth signal

Clip 2: Power supply 14 ... 30 V

Clip 3: Test plus

Clip 4: Signal plus / test minus

Accuracy of the output signal

The accuracy of the output signal is stated with reference to the measuring

span, e.g.:

Output signal: 0 ... 20 mA Measuring span: 20 mA

Output signal: 4 ... 20 mA Measuring span: 16 mA

For the permissible error limits the accuracy class of the base instrument

applies, e.g.:

Base instrument: Class 1.5 Permissible deviation: ±1.6 %

Output signal: 4 ... 20 mA Measuring span: 16 mA

Permissible deviation of the output signal: = ± 0.256 mA

Please note:

With regard to the measuring error the transmitter should always to be consi-

dered separately, i.e. the measurement error of the output signal must always

be separately tested in comparison with the reference standard.

5. Repairs

Repairs are only to be carried out by the manufacturer or appropriately trained

personnel.



1. Sicherheitshinweise 10

2. Prüfung der Anzeige 10

2.1 Ablauf der Anzeigeprüfung 11

3. Prüfung des Schaltkontaktes 12

4. Prüfung bei Ferngebern 14

5. Reparaturen 14

WIKA Prüfanleitung für mechanische Druckmessgeräte

2061744 09/2009 GB/D/F/E

Inhalt

Vorsicht

2061744 09/2009 GB/D/F/E

WIKA Prüfanleitung für mechanische Druckmessgeräte

1. Sicherheitshinweise / 2. Prüfung der Anzeige

1. Sicherheitshinweise

Beachten Sie unbedingt bei Montage, Inbetriebnahme, Betrieb und

Demontage dieser Geräte die entsprechenden nationalen Sicher-

heitsvorschriften (z. B. VDE 0100 / EN 837-2).

Nur entsprechend qualifiziertes Personal darf an diesen Geräten arbeiten

Druckmessgeräte nur im drucklosen Zustand demontieren

Messstoffreste in ausgebauten Druckmessgeräten können zur Gefährdung

von Menschen, Umwelt und Einrichtung führen.

Ausreichende Vorsichtsmaßnahmen sind zu ergreifen.

Bei Nichtbeachten der entsprechenden Vorschriften können schwere Körper-

verletzungen und / oder Sachschäden auftreten

2. Prüfung der Anzeige

Arbeitsgrundsätze

Prüfung der Anzeigegenauigkeit erfolgt nach EN 837

Prüfung der Anzeige erfolgt immer nach Verkehrsfehlergrenze

Prüfung erfolgt bei steigenden und bei fallenden Druck. Anfang und Ende

der Skale sind Messpunkte bei Geräten mit freiem Nullpunkt

Für die Prüfung muss als Normal ein Druckmessgerät verwendet werden,

dessen Messgenauigkeit mindestens viermal besser ist als die des zu

prüfenden Gerätes

z. B.: Prüfling = Klasse 1,6 ⇒Prüfnormal ≤Klasse 0,25

Die angezeigten Messwerte werden nach leichtem Klopfen am Gehäuse

abgelesen

Bei Druckmessgeräten mit elektrischen Grenzsignalgebern ist der/die

Sollwertzeiger so zu stellen, dass eine Belastung des Istwertzeigers

möglichst ausgeschlossen ist.

Die Prüfung des Anzeigebereiches mit Grenzsignalgebern als Wechsler

erfolgt bei Wechslerstellung 12 Uhr (beide Kontaktarme belasten den

Istwertzeiger).



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