Technical information

Electrical mounting of pressure sensors and electronic pressure
switches
WIKA data sheet IN 00.50

Description
WIKA offers measuring instruments with a variety of electrical
outputs in order to meet diverse customer-specific application requirements.
Basically, electrical connections are divided into two categories: electrical connection using connectors and electricalconnection using cables with open stranded wires. Twovariants are possible for the latter - cable connected directly
to the pressure sensor or cable connected to the pressure
sensor using a connector.
In addition, for the electrical connections of pressure sensors,a basic distinction is made between the two characteristics of
2-wire and 3-wire connections. Electrical pressure switches
are available in versions with one or two switch contacts.
In the case of pressure sensors with a digital output signal, it
is also possible to duplicate the signal output and to separate
the signal output and the voltage supply.
Depending on the characteristics and detailed design of thecategory of electrical connection, there are different assignments of the stranded wires or the contacts of the respective
connector.
This document describes the basic steps and requirements
for electrical installation. Individual product information canbe found in the respective operating instructions.

WIKA data sheet IN 00.50 ∙ 03/2023

Requirements for the mounting point
The mounting point must meet the following conditions:■ Air humidity ≤ 80 % r. h. (non-condensing).
■ Protected from weather influences.
■ Sufficient space for a safe electrical installation.
■ Permissible ambient temperatures remain within theperformance limits of the measuring instrument. Consider
possible restrictions on the ambient temperature rangecaused by mating connectors used.

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Making the electrical connection
Preparation:■ Only use original accessories.

■ To connect the instrument, the mating connector or cable outlet must be assembled in advance.
■ Only use cables with suitable characteristics for the particular operating conditions.

■ Select a cable diameter that matches the cable bushing of the connector.
→ For accessories, see data sheet ofr the respective pressure sensors or electronic pressure switches.

Electrical mounting:
Mating connector
Make the connection to the mating connector, see „Fitting a DIN 175301-803 angular connector“ on pageSeite 3.
1. Make sure that the cable gland of the mounted plug has a tight fit.
2. Check existing seals for damage.
3. Establish the plug connection. Tighten any cable glands and check the correct seating of the seal, if present, to ensure theingress protection.
Only the correct combination of connector and mating connector will ensure the desired IP ingress protection.
Cable outlet
1. Select mounting option.
2. Cable with ventilation tubes must be vented to atmosphere.
3. If specified, with cable versions, attach strain relief.
4. For cable outlets, make sure that no moisture enters at the cable ends.
Fitting a DIN 175301-803 angular connector
1. Loosen the screw (1).

(D)

2. Loosen the cable gland (2).

3. Pull the angular connector (5) + (6) away from the instrument.
4.

CAUTION!
Improper mounting
The seal of the angle housing will be damaged.
▶ Do not try to push the terminal block (6) out using the screw hole (1) or thecable gland (2).

Via the mounting hole (D), lever the terminal block (6) out of the angle housing (5).
5. Slide the cable through the cable gland (2), the ring (3), the seal (4) and the angle housing(5).
6. Connect the cable ends to the terminal block (6) in accordance with the connection
diagram.
7. Press the angle housing (5) onto the terminal block (6).

8. Make sure that the seals are not damaged and that the cable gland and seals are correctlyseated in order to ensure ingress protection.
9. Tighten the cable gland (2) around the cable.

10. Place the flat gasket (7) over the instrument's connection pins.

(2)
(3)

(4)
(1)
(5)

(6)
(7)(8)

11. Push the angular connector (5) + (6) onto the instrument.
12. Tighten the screw (1).

WIKA data sheet IN 00.50 ∙ 03/2023

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Connection types: Example of M12 and DIN-A connector
Angled socket, DIN 175301-803 A
3-wire connection

2-wire connection

U+

U+

S+

1
3

1
32

2

U-

U-

Circular connector, M 12x1, 4-polig
2-wire connection

3-wire connection

U+

U+

2

12

1

3

4

34

U-Legend
U+
U-

S+

S+
U-

Positive power supply terminal
Negative power supply terminal
Analogue output
Voltage output
Load→ The pin assignment must be taken from the respective product label.

WIKA data sheet IN 00.50 ∙ 03/2023

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03/2023 EN© 03/2023 WIKA Alexander Wiegand SE & Co. KG, all rights reserved.
The specifications given in this document represent the state of engineering at the time of publishing.
We reserve the right to make modifications to the specifications and materials.

WIKA data sheet IN 00.50 ∙ 03/2023

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WIKA Alexander Wiegand SE & Co. KG
Alexander-Wiegand-Straße 30
63911 Klingenberg/GermanyTel.
+49 9372 132-0
Fax+49 9372 132-406
info@wika.de
www.wika.de