Technical information

Switch contacts for pointer instruments■ Model 821, magnetic snap-action contact■ Model 831, inductive contact■ Model 830 E, electronic contact■ Model 851, reed contact
WIKA data sheet IN 00.48

Applications■ Control and regulation of processes■ Monitoring of plants and switching of circuits■ Indication of limit conditions■ Inductive contact for completely fail-safe switching, evenin explosion hazardous areas■ Machine building, general plant construction, chemicalindustry, petrochemical industry, power plants, mining,
on-/offshore and environmental technology

Special features

Contact pressure gauge with switch contact model 821■ High reliability and long service life

■ Can be incorporated within all relevant pressure andtemperature measuring instruments■ Up to 3 switch contacts per measuring instrument■ Optionally with liquid-filled case for high dynamic pressureloads and vibrations■ Inductive contact also available in safety version andelectronic contact for PLCs

Description
Switch contacts make or break circuits dependent upon the
pointer position of the indicating measuring instrument. The
switch contacts are mounted predominantly below the dial,
though also partly on top of the dial. DIN 16085 stipulates
that the setting range for a contact test is between 10 % and
90 % of the span. The instrument pointer (actual value pointer) moves freely across the entire scale range, independentof the setting. The set pointer for the switch point of circular
instruments and square panel-mounted instruments can be
adjusted using an adjustment key in the window. Contacts
in flush panel-mounted instruments are adjustable using ascrewdriver through the window.
WIKA data sheet IN 00.48 ∙ 04/2024

Bimetal thermometer with inductive
contact model 831

Contact actuation is made when the actual value pointertravels beyond or below the set switch point.
Instruments with electrical switch contacts can also bedelivered with optional special approvals. Depending on the
instrument model, e.g. approvals for hazardous areas areavailable.
Page 1 of 13

Model 821, magnetic snap-action contact
Application
These contacts can be used in almost all operating conditions, and even in liquid-damped instruments.
The set pointer has an adjustable permanent magnet
attached, giving a snap-action characteristic to the contacts,
which, furthermore, strengthens the contact pressure. Thissnap action widely protects the contacts against harmful arc
influences, but increases the switch hysteresis to 2 % up to
5 % of the measuring span. The hysteresis is the differenceof the displayed values, measured by reversing the direction of movement and leaving the switch point unchanged.
The signal output is achieved either ahead of or behind the
movement of the actual value pointer. The recommended
setting range of the contacts is 25 ... 75 % of the scale.
Specifications and loading tables
If the specified data are observed, the switch contacts ensure
perfect operation for many years. Since the switching powerof these contact types is limited, for higher loads (max. 2kVA) and for instruments with liquid filling, a model 905
contact protection relay must be used.
→ See data sheet AC 08.05.

For low switching voltages, to maintain reliability, thecurrent to be switched should not be less than 20 mA.
In order to ensure a high switching reliability of thecontacts, even taking ambient influences into account,the switching voltage should not be below 24 V.
In accordance with DIN 16085, requirements on pressure
measuring instruments with contacts for switching currents
less than 24 V should be agreed specifically between theuser and the manufacturer.
When switching inductive or capacitive loads, the usual
contact protection measures against contact erosion should
be made.
For programmable logic controllers (PLCs), the model 830 E
electronic contact is recommended; → See from page 12.

Specifications
Limit values for thecontact load withresistive load

Model 821, magnetic snap-action contact
Unfilled instruments

Switch version “S”

Switch version “L”

Switch-on current≤ 1.0 A

Switch-off current≤ 1.0 A

Continuous current≤ 0.6 A

Rated operating voltage Ueff
Rated operating current≤ 250 V

Filled instruments

Switch version “S”

Switch version “L”≤ 0.5 A≤ 1.0 A≤ 0.5 A≤ 0.5 A≤ 1.0 A≤ 0.5 A≤ 0.3 A≤ 0.6 A≤ 0.3 A

≤ 250 V1)

Switching power≤ 30 W / 50 VA

Contact material

Silver-nickel (80 % silver / 20 % nickel / gold-plated)

Ambient temperature-20 ... +70 °C [-4 ... +158 °F ]Number of contacts max.

4

≤ 20 W / 20 VA

1) Specification of the switch version in the data sheet of the instrument.

WIKA data sheet IN 00.48 ∙ 04/2024

Page 2 of 13

Recommended contact load with resistive and inductive loads
Voltage in V

(DIN IEC 38)
DC / AC

Model 821, magnetic snap-action contact

Unfilled instruments

Resistive load

Inductive
load

Filled instruments
Resistive load

Model 811, sliding contact

Inductive
load

Unfilled instruments
Resistive load

Inductive
load

Directcurrent

Alternating
current

cos ϕ > 0.7

Directcurrent

Alternating
current

cos ϕ > 0.7

Directcurrent

Alternating
current

cos ϕ >
0.7

mA

mA

mA

mA

mA

mA

mA

mA

mA

220 / 230

100

120

65

65

90

40

40

45

25

110 / 110

200

240

130

130

180

85

80

90

45

48 / 48

300

450

200

190

330

130

120

170

70

24 / 24

400

600

250

250

450

150

200

250

100

Contact materials
Depending upon the switching conditions, the switch
contacts are subjected to greater or lesser erosion due to theeffects of the unavoidable arcing and through mechanicalstress. As a result, when selecting the contact material, attention should be paid to the predominant operating conditions.
The following contact materials are available:

Platinum-iridium is exceptionally chemically resistant,and also hard and very resistant to erosion. It is used forhigh switching frequencies, high switching powers and inaggressive environments.

Silver-nickel composite material(80 % silver / 20 % nickel / gold-plated)
Material properties:■ Higher hardness and rigidity■ Good erosion resistance■ Low inclination to fuse together■ Low contact resistanceDue to its good balance of properties and wide application
possibilities, this composite is used as our standard material.
Platinum-iridium alloy(75 % platinum, 25 % iridium)

Other versions■ Contacts with separate circuits■ Change-over contacts (break or make simultaneously at

the set point)■ Contacts fixed■ Contacts with parallel resistance 47 kΩ for cable breakmonitoring■ Contact adjustment lock leaded■ Contact adjustment key fixed■ Connector (instead of cable or cable socket)■ Special contact material platinum-iridium alloy

WIKA data sheet IN 00.48 ∙ 04/2024

Page 3 of 13

Switching functions

For switch contacts with multiple contacts, the 1st contact isthe one closest to the left start of scale value.

The following applies, as a general rule, to the switching
functions of the model 821 magnetic snap-action contacts
with our standard settings:
Index 1
Index 2

Index 3Circuitdiagrambehind the contact model no. means:
Contact makes the circuit when the set point isexceeded.
behind the contact model no. means:
Contact breaks the circuit when the set point isexceeded.

behind the contact model no. means: When theset value is exceeded, one circuit breaks andone circuit makes simultaneously (change-overcontact).

The switching function, described in the following table,
follows the clockwise rotary motion of the instrument
pointer (actual value pointer).
If the actual value pointer moves anticlockwise, the reverse
switching function occurs!
Note: If the switch contacts are to be set (adjusted) anticlockwise, the index figures in brackets must be used in accordance with DIN 16085. Combinations are possible.

Switching function on pointer movement in a clockwise direction

Single contact 1)

Contact makes when the set point isexceeded1

Contact model with index of
the switching function
821.1
(.5)

4

Contact breaks when the set point isexceeded

1

821.2
(.4)

4

Contact changes over (change-overcontact), i.e. 1 contact breaks and 1
contact makes when the set point isexceeded2

1

4

Double contact 1)

1st and 2nd contact makes when theset points are exceeded

1

2

4

4

1st contact makes, 2nd contact
breaks when the set points are
exceeded

1

2

4

4

1st contact breaks, 2nd contact
makes when the set points are
exceeded

1

2

4

4

1st and 2nd contact breaks when theset points are exceeded

1

2

4

4

1

2

3

4

4

4

Triple contact 1)

1st contact breaks, 2nd contact
makes, 3rd contact breaks when theset points are exceeded

821.3
(.6)

821.11(.55)
821.12(.54)
821.21(.45)
821.22(.44)

821.212(.454)

1) When ordering, attach the corresponding index of the required switching functions (note order 1st, 2nd, 3rd contact) to the contact model no., see example 821.212.

The connection terminals and connection wires are marked in accordance with the table above. Protective conductors arealways yellow-green.
WIKA data sheet IN 00.48 ∙ 04/2024

Page 4 of 13

Model 851, reed contact
Application
Reed contacts are often used for switching small voltages andcurrents, since their hermetically sealed design, in combination with contacts in inert gas, cannot become corroded on
the contact surfaces. Their high reliability and low contact
resistance make them suitable for a large number of applications. They include, for example, PLC applications, signal
conversion in measuring instruments, signal lights, acoustic
signal transmitters and many more. Their hermetically sealed
design makes these contacts ideally suited for use at highaltitudes. Reed contacts need no auxiliary supply voltage andare very insensitive to vibrations, due to their low weight. For
2 contacts, the individual switches are galvanically separated
from each other.
Note
Due to its ability to simultaneously switch both the smallest
currents and voltages as well as powers of up to 60 watts,
this contact form is ideal for applications in which the signal
has not yet been exactly defined in the planning phase.
Design and function
A reed contact consists of three contact tongues (change-overcontact, SPDT), made of a ferromagnetic material, which are
fused in a glass body under an inert gas atmosphere.
To minimise wear and guarantee a low contact resistance,
the contact tongues are provided with a metal coating in thearea of the contact surfaces. The reed contact is actuatedby an external magnetic field, e.g. permanent magnet.
The switching status is maintained until the magnetic fieldstrength has fallen below a certain value.
Predominantly, WIKA uses mainly bistable and magneticallybiased reed contacts. The bias maintains the signal status
until a magnetic field having the opposite magnetic polarity
resets the contact.

If only signal loads or small loads are switched, then switching operations in excess of 108 are easily achievable. Withswitching voltages below 5 V (arcing limit), switching operations beyond 109 can be achieved. For capacitive or inductive loads, the use of a protective circuit is required since theresulting current, or voltage spikes would destroy the reed
contact or at least significantly reduce its service life. For this,see the chapter on contact protection measures on page 8.
If a magnetic field passes the reed contact, both contact
tongues attract each other and close the contact. The electrical current can flow.
If the magnetic field moves away, the field strength drops
with increasing distance. The contact remains closed throughthe bistability. Only a new traverse of the reed contact with amagnetic field in the opposite direction opens the two contact
tongues again. The electrical current is interrupted.
As with other mechanical switches, the reed contact is also
not bounce-free. However, the bounce times are shorter thanmost other mechanical contacts. Nevertheless, this physicalproperty should be considered, especially in PLC applications (keyword: software debounce / button debounce).
Example:If the switch point for a 10 bar switchGAUGE is set, forexample, to 1 bar and the instrument pointer sweeps thisvalue with the magnet in the positive direction, the reed
contact will change state and maintain it, even if the pointercontinues to 10 bar.
The reed contact will only further change its state if thepointer passes 1 bar in the direction of 0.

Due to the hard coating of the contact surface with, forexample, ferromagnetic rhodium, the reed contact achieves
a very long service life. The number of possible switchingcycles of a reed contact depends largely on the level of theelectrical load, but, based on experience, is in the range of
106 to 107.
Functionality
Reed contact SPDT (change-over contact) not activated

Reed contact SPDT (change-over contact) activatedContact tongue
Inert gas
COM

Glass bodyConnecting wireNO
NC

COM = Common contact
NC = Normally closed
NO = Normally open
WIKA data sheet IN 00.48 ∙ 04/2024

Page 5 of 13

Specifications for model 851, reed contact
Limit values for the contact load with resistive load
Contact version

Change-over contact

Max. switching voltage

AC 250 V / DC 250 V

Switching current≤1A

Transport current≤ 2A

Switching power

60 VA/W

Insulation resistance109 ΩType of contact

BistableMin. switching voltage

Not required

Min. switching current

Not required

cos ϕ

1

Contact resistance (static)

100 mΩ

Breakdown voltage

DC 1,000 V

Contact material

Rhodium

Switching time incl. contact
chatter

4.5 msSwitch hysteresis

3 ... 5 %■ The limit values presented here must not be exceeded independently of each other.

■ When using two contacts, these cannot be set to the same point. In this case, a minimum clearance of approx. 30° is

required.

■ The adjustment range of the contacts is 10 ... 90 % of the scale.

■ The switch hysteresis can be set in manufacturing such that the reed contact will actuate exactly at the required switch

point. For this, the switching direction is required on order.

■ In other pressure gauges, e.g. model 700.0x and 230.15 2", further reed contacts are used. For the specifications, pleaserefer to the respective data sheet.

WIKA data sheet IN 00.48 ∙ 04/2024

Page 6 of 13

Operating limits for magnetic snap-action or reed contacts
General information
Each mechanical switch has 4 physical limits.
■ Maximum electrical switching voltage■ Maximum electrical switching current■ Maximum electrical load to be switched■ Maximum mechanical switching frequency

Outside these specified physical limits, the switch should not be operated. Should even only one of these limits be exceeded
during operation, the service life of the switch will be shortened. The further that one or more limits are exceeded, the greater
the shortening of the service life of the switch, even as far as immediate failure.
Maximum electrical switching voltage
When switching an electrical load, an arc may arise, more orless visible, between the contact surfaces. Due to the resulting, locally limited, high heat, the contact material gradually
evaporates during each switching process (material loss,
erosion). The higher the voltage to be switched, the larger are
the arcs and thus the contact material evaporates more andfaster.
The contact will be permanently damaged.
Maximum electrical switching current
When switching an electrical current, the contact surface
will be heated through the charge carrier flow (contact
resistance). If the maximum permissible switching current isexceeded, the contacts begin to fuse together. This can leadto the welding or sticking of the two contact surfaces. The
contact will be permanently damaged.
Maximum electrical power
The maximum electrical power which a contact can switch isdefined as the switching voltage multiplied by the switchingcurrent. This electrical power heats the contact and should
not be exceeded (welding, sticking).
The contact will be permanently damaged.
Maximum mechanical switching frequency
The maximum possible switching frequency is dependent
upon the wear of the bearing points and also the material
fatigue.

WIKA data sheet IN 00.48 ∙ 04/2024

Minimum electrical values
Each mechanical contact has a contact resistance due toimpurity layers (impurity-film resistance RF). This impurityfilm resistance exists through oxidation or corrosion on thecontact surfaces and increases the electrical resistance ofthe switch. With switching of small loads, this layer is not
penetrated. Only by switching higher voltages and currents
is this destroyed. This effect is known as fritting, and therequired minimum voltage is the fritting voltage. If this voltage
is not reached when switching, the impurity-film resistancewill continue to increase and the switch will cease to work.
This effect is reversible.
Further notes
Such electrical overloads can be based, for example, on thefollowing:■ Filament lamps absorb up to 15 times more current at the

moment of switching-on than during operation (nominal
value).
■ Capacitive loads, at the moment of switching on, createa short-circuit (long control lines, lines running parallel toeach other).
■ Inductive loads (relay, fuse, solenoid valve, rolled cable
drum, electric motors) generate, on switching, very highvoltages (up to 10 times the rated voltage).

Page 7 of 13

Contact protection measures
Mechanical contacts must not exceed the specified electricalvalues for switching current and switching voltage, not evenfor a short time only.
For capacitive or inductive loads we recommend one of thefollowing protective circuits.

3. Capacitive load
With capacitive loads elevated switch-on currents arise.
These can be reduced by series-connecting resistors in the
supply line.
Switch contact

1. Inductive load with DC voltage
With DC voltage the contact protection can be achieved via
a free-wheeling diode, connected in parallel to the load. The
polarity of the diode must be arranged so that it closes when
the operating voltage is on.
Switch contact
Switch contact

Diode

Example: Contact protection measurewith free-wheeling diode2. Inductive load with AC voltage
With AC voltage, two protection measures are possible.
Switch contact

Example: Contact protection measure with voltagedependent resistor VDR

Example: Contact protection measure with currentlimiting resistor
Contact curve
The hatched area of the contact curve shows the permissible
electrical values for the respective contact.
The voltage to be switched must neither be above themaximum nor below the minimum switching voltage (Vmax ≤Us ≤ Vmin).
The current to be switched must neither be above themaximum nor below the minimum switching current(Amax ≤ Is ≤ Amin).
The power to be switched may only lie below the limit curve.

Switch contact

Vmax. voltage

Switching voltage

Vmax

Example: Contact protection measure with RC element

limit curve
allowed working range

Vmin
Amin

WIKA data sheet IN 00.48 ∙ 04/2024

max. current

Switching current

Amax

A

Page 8 of 13

Model 831, inductive contact
Application
Measuring instruments with WIKA inductive contacts may
be used in zone 1 and 2 hazardous areas. Provided that they
are supplied from a suitable and certified control circuit (e.g.
WIKA model 904.28 control unit).
Outside of hazardous areas, these WIKA inductive contacts
are primarily used where particularly safe switching at higher
switching rates is important. Since the contacts also workin liquid filling, such instruments can even be used in very
specific operating conditions. Some typical application areas
are in chemical, petrochemical and nuclear plants.
Functional principle
The WIKA inductive contact works in a non-contact way.
Essentially, it consists of the control head (initiator), attachedto the set pointer, with its fully potted electronics and themechanical assembly with the moving flag. The flag is movedby the instrument pointer (actual value pointer).
The control head is supplied with a DC voltage. When theflag enters the slot in the control head, this then increases
its internal resistance (= damped condition / the initiator has
high impedance). The subsequent change in the current acts
as the input signal for switching amplifiers of the control unit.

Advantages of the WIKA inductive contact■ Long service life due to non-contact switching■ Low influence on the display■ Universal application, even with filled instruments■ Insensitive to aggressive environments (potted electron-

ics, non-contact switching)■ Explosion-protected, can be used in zone 1 and 2

Design concept of the WIKA inductive system
The WIKA inductive system consists of the WIKA inductive contact built into the measuring instrument (as alreadydescribed) and a model 904 control unit; → See data sheet
AC 08.04.
The control unit consists of■ Power supply unit
■ Switching amplifier■ Output relay
The power supply unit converts the mains voltage for thecontrol unit. The switching amplifier supplies the control
head and switches the output relay. Via the output relay, highelectrical powers can be switched.
There are two versions of control unit:■ Non-intrinsically safe version (non-Ex version)■ Intrinsically safe version (Ex version)

Functional diagram
R < 1.7 kΩ

R=0

sw (-)
0801-A

8 V corresponds tored (+)

R=∞

R > 1.7 kΩ
sw (-)
8 V corresponds tored (+)

The control unit effectively works without influence on themeasuring system. The non-contact switching produces nowear within the electrical system. The assembly dimensions
correspond to the model 821 contacts. Setting of the set
points is carried out as for these contacts.
Ambient temperature: -25 ... +70 °C [-13 ... +158 °F ] 1)
Control head used (slot sensor): Model 831

1) With use in hazardous areas, the prescribed upper limit values for the ambient temperature must be observed! These are dependent upon the voltage, current, power andtemperature class.

WIKA data sheet IN 00.48 ∙ 04/2024

Page 9 of 13

Switching functions
The following applies, as a general rule, to the switching
functions of the model 831 inductive contacts in connection
with our standard settings:
Index 1behind the inductive contact model no. means:
Contact makes the control circuit when theset point is exceeded (flag moves out of thecontrol head).

Index 2behind the inductive contact model no. means:
Contact breaks the control circuit when the set
point is exceeded (flag moves into the controlhead).

Circuitdiagram 2)
Single contact 1)

For inductive contacts with multiple contacts, the 1st contact
is the one closest to the left start of scale value or end value(be careful with vacuum gauges).
The switching function, described in the following table,
follows the clockwise rotary motion of the instrument
pointer (actual value pointer). If the actual value pointermoves anticlockwise, the reverse switching function
occurs!
Note: If the inductive contacts are to be set (adjusted)
anticlockwise, the index figures in brackets must be used inaccordance with DIN 16085. Combinations are possible.

If the pointer of the measuring
instrument moves clockwise,
on exceeding the defined set
point, the flag is driven:

Switching function (illustrationof the principle)

Inductive contact model withindex of the switching function

out of the control headContact
makes

831.1
(.5)

2

1

into the control headContact
breaks

2

831.2
(.4)

1

Double contact 1)of the 1st and 2nd contact out of thecontrol head

1st and
2ndcontact
makes

2

4

1

3

of the 1st contact out of the control
head, the 2nd contact into the control
head

1st
contact
makes,
2nd
contact
breaks241

3of the 1st contact into the control
head, the 2nd contact out of thecontrol head

1st
contact
breaks,2nd
contact
makes

2

4

1

3

of the 1st and 2nd contact into thecontrol head

1st and
2ndcontact
breaks2

41

3

831.11(.55)

831.12(.54)

831.21(.45)

831.22(.44)

Triple contact 1)

A number of instruments can be fitted with up to 3 inductive contacts.
→ For technical notes, see page 11.
Switching and switch behaviour in principle as in the previous table.
1)
2)

When ordering, attach the corresponding index of the required switching functions (note order 1st, 2nd, 3rd contact) to the inductive contact model no.
Thin line means: Flag in control head, control circuit open. Thick line means: flag out of the control head, control circuit closed

The connection terminals and connection wires are marked in accordance with the table above.
WIKA data sheet IN 00.48 ∙ 04/2024

Page 10 of 13

Triple contact
With standard inductive contacts in the triple design, thesetting of all three contacts to the same set point is not
physically possible. Either the left (= 1st contact) or the rightcontact (= 3rd contact) must be separated by ≥ 30° to the leftor the right of the two set pointers, which may be set to thesame value:
Examples
1st contact
set to the left

≥ 30°

2nd and 3rdcontacts canbe set to thesame value

1st and 2nd
contacts canbe set to thesame value≥ 30°

3rd contact
set to theright

Safety inductive contacts
Safety inductive contact, model 831 SN and 831 S1N
For safety-critical applications, such as for the constructionof self-monitoring controls, type-tested components must be
used. Corresponding certifications are available for the model
831 SN and model 831 S1N safety inductive contacts. The
precondition is operation with a similarly certified fail-safe
control unit (isolating amplifier), e.g. model 904.30 KHA6-SHEx1; → See data sheet AC 08.04.
Measuring instruments with safety inductive contacts may be
used in zone 1 hazardous areas. Control head used (SN/S1N
slot sensor): Model 831 from Pepperl+Fuchs.
Switch behaviour, model 831 SN
If the flag is in the slot sensor, then the output of thedownstream control unit (0 signal) is inhibited, i.e. the output
relay is de-energised (= safe state).
For the index of the switching functions, the emergence ofthe flag out of or insertion into the control head and also
the installation options, the same information applies as formodel 831 inductive contacts.

Combination of all triple contacts
The 1st set pointer is set
approx. 30° to the left

The 3rd set pointer is set
approx. 30° to the rightModel
831.1.11
831.1.12
831.1.21
831.1.22
831.2.11
831.2.12
831.2.21
831.2.22

Model
831.11.1
831.11.2
831.12.1
831.12.2
831.21.1
831.21.2
831.22.1
831.22.2

Switch behaviour, model 831 S1N
If the flag is not in, but rather outside the slot sensor, thenthe output of the downstream control unit (0 signal) is inhibited, i.e. the output relay is de-energised (= safe state).
For the index of the switching functions, the same information
applies as for model 831 inductive contacts with the following
difference:
Index 1behind the inductive contact model no. means:
Contact makes the control circuit when theset point is exceeded in the clockwise direction(flag moves into the control head).

Index 2after the inductive contact model no. means:
Contact breaks the control circuit when theset point is exceeded in the clockwise direction(flag moves out of the control head).

Special version
Triple contact NS 160, settable to one set point
lf the setting of 3 contacts to a single set point is absolutely
needed, then this can be achieved with NS 160 throughthe use of a smaller control head. This must be defined onordering.

WIKA data sheet IN 00.48 ∙ 04/2024

Page 11 of 13

Model 830 E, electronic contact
Description, application
Direct switching of small capacities which are usuallyrequired in connection with a programmable logic controller(PLC) can be realised by this inductive contact with integrated switching amplifier model 830 E which is factory-installed
directly into the measuring instrument.
The usual advantages of inductive contacts, such as fail-safe
switching, no wear due to non-contact switching as well aspractically no effect on the measuring system, also apply
here.
No additional control unit is required.
The electronic contact can be selected with 2- or 3-wiredesign and is implemented with PNP output. The operating
voltage is DC 10 ... 30 V. The maximum switching current is
100 mA.

Electrical connection
Control and switching electronics in the sensor, electricalconnection via cable socket■ To connect a PLC control unit or for direct switching of

small capacities■ PNP transistor

With PNP switching apparatus, the switched output isa connection towards PLUS. The load RL between theswitched output and the MINUS should be selected in a
way not to exceed the maximum switching current of 100
mA.
■ Flag emerges from slot sensor: Contact open (output not
active)■ Flag retreats into slot sensor: Contact closed (output
active)2-wire system (standard)

The model 830 E electronic contact is not intrinsicallysafe and therefore not suitable for applications in hazardous
areas!

Measuring instrument

For the index of the switching functions, the same information
applies as for model 831 inductive contacts with the following
difference:

PNP

Index 1

Index 2behind the inductive contact model no. means:
Contact makes the control circuit when theset point is exceeded in the clockwise direction(flag moves into the control head).
after the inductive contact model no. means:
Contact breaks the control circuit when theset point is exceeded in the clockwise direction(flag moves out of the control head).

Note: The direction of the action of the flag is also reversible,
as with model 831!

4

PLC
+UB

1
RL (load)-

With double contact
2nd contact
2
RL (2nd load)

PNP

3-wire system
Measuring instrument

2

PLC
+UB

1

PNP

-

3
RL (load)

With double contact
2nd contact

PNP

4
RL (2nd load)

WIKA data sheet IN 00.48 ∙ 04/2024

Page 12 of 13

Specifications for model 830 E, electronic contact
Specifications
Supply voltage

DC 10 ... 30 V

No-load current≤ 10 mA

Residual current≤ 100 µA

Type of output

PNP transistor

Reverse polarity protection

conditional UB (the output 3 or 4 switch must never be set directly to minus)

Oscillator frequency

Approx. 1,000 kHz

Installation

Direct in measuring instrument, maximum 2 inductive contacts possible

Residual ripple

max. 10 %Switching current≤ 100 mA

Function of switching element

Normally open

Voltage drop (with Imax.)≤ 0.7 V

Anti-inductive protection

1 kV, 0.1 ms, 1 kΩ

EMC

Per EN 60947-5-2

04/2024 EN© 07/2022 WIKA Alexander Wiegand SE & Co. KG, all rights reserved.
The information provided in this document corresponds to the current state of the art and may vary slightly depending on the production site.
The information provided is for general information purposes only and is not legally binding. We reserve the right to make changes in individual cases or special versions.
In the event of a different interpretation of the translated and the English data sheet, the English wording shall prevail.

WIKA data sheet IN 00.48 ∙ 04/2024

Page 13 of 13

WIKA Alexander Wiegand SE & Co. KG
Alexander-Wiegand-Straße 30
63911 Klingenberg/GermanyTel.
+49 9372 132-0
info@wika.de
www.wika.com