Pressure

Compact differential pressure switch

Models DC, DCC
WIKA data sheet PV 35.40

Process Compact Series

Applications
■ Pressure monitoring and control of processes
■ Safety-critical applications in general process instrumen-
tation, especially in the chemical and petrochemical indus-
tries, oil and gas industries, power generation incl. nuclear
power plants, water/wastewater industries, mining
■ For gaseous,liquid and aggressive media, also in
aggressive ambience
■ Filter and level monitoring

Special features
■ No power supply needed for switching of electrical loads
■ Robust switch enclosure from aluminium alloy or stainless
steel 316L, IP66, NEMA 4X
■ Setting ranges from 0 ... 160 mbar to 0 ... 40 bar with high
static and high one-sided pressure up to 250 bar
■ Ex ia version available
■ 1 set point, SPDT or DPDT, high switching power up to Differential pressure switch, model DC
AC 250 V, 15 A

Description
These high-quality pressure switches have been developed All wetted materials are from stainless steel as a standard.
especially for safety-critical applications. The high quality of For applications with special requirements on the wetted
the products and manufacturing in accordance with ISO 9001 parts, a version with Monel is available.
ensure reliable monitoring of your plant. In production, the
switches are traced by quality assurance software at every By using a diaphragm measuring system, the model DC
step and subsequently are 100 % tested. differential pressure switch is extremely robust and guaran-
tees optimal operating characteristics and the highest
In order to ensure as flexible operation as possible, measuring performances, with repeatability lower than 1 %
the pressure switches are fitted with micro switches, of span.
which enable the switching of an electrical load of up to
AC 250 V, 20 A directly. The process connection with a centre distance of 54 mm
For lower switching power ratings, such as for PLC appli- lower mount allows an easy and comfortable mounting of a
cations, argon gas-filled micro switches with gold-plated standard valve manifold.
contacts can be selected.

WIKA data sheet PV 35.40 ∙ 03/2021 Page 1 of 6

Data sheets showing similar products:

Compact differential pressure switch, flameproof enclosure Ex d; models DE, DEC; see data sheet PV 35.41
Standard version Ignition protection type (option)
■ Ex ia I Ma (mines), only available for model DC with stain-
Measuring system less steel switch enclosure
Double diaphragm with transmission shaft, without sealing ■ Ex ia IIC T6/T4 1) Ga (gas)
elements ■ Ex ia IIIC T85/T135 1) Da (dust)
1) The temperature class is related to the ambient temperature range. See the type exami-
Switch enclosure nation certificate for further details.

■ Aluminium alloy, copper-free, epoxy resin coated

Safety-related maximum values
■ Stainless steel 316L (only available for model DC)
(only for optional Ex ia versions)
Tamper-proof Maximum values
Laser-engraved product label from stainless steel Voltage Ui DC 30 V
Current li 100 mA
Ingress protection
IP66 per EN/lEC 60529, NEMA 4X Power Pi 0.75 W
Internal capacitance Ci 0 μF
Permissible temperature Internal inductance Li 0 mH
Ambient Tamb: -30 ... +85 °C
Medium T M: -30 ... +85 °C

Switch contact
Micro switches with fixed dead band
■ 1 x SPDT (single pole double throw)
■ 1 x DPDT (double pole double throw)

The DPDT function is realised with 2 simultaneously trigger-

ing SPDT micro switches within 2 % of the span.

Contact version Electrical rating (resistive load) Suitable for

AC DC Ex ia option

A 1 x SPDT, silver 250 V, 15 A 24 V, 2 A, 125 V, 0.5 A, 220 V, 0.25 A No

B 1 x SPDT, silver, hermetically sealed, argon gas filling 2) 250 V, 15 A 24 V, 2 A, 220 V, 0.5 A Yes
C 1 x SPDT, gold-plated, hermetically sealed, argon gas filling 2) 125 V, 1 A 24 V, 0.5 A Yes
G 1 x DPDT, silver 250 V, 1 A 24 V, 0.5 A No

2) Permissible ambient temperature range: -30 ... +70 °C

Set point adjustment Example

The set point can be specified by the customer or factory-set Setting range: 0 ... 10 bar with one switch contact
within the setting range. Subsequent adjustment of the set Repeatability: 1 % of 10 bar = 0.1 bar
point on site is made using the adjustment screw, which is Dead band: (see table setting ranges)
covered by the access cover plate with lead seal option. 2 x repeatability + dead band = 2 x 0.1 bar + 0.3 bar = 0.5 bar
Rising pressure: Adjust set point between 0.5 ...10 bar.
Repeatability of the set point Falling pressure: Adjust set point between 0 ... 9.5 bar.
≤ 1 % of span
Process connection
Please specify: Stainless steel, lower mount (LM)
Set point, switching direction for the contact, e.g.: ■ ¼ NPT female (standard)
Set point: 5 bar, rising ■ ½ NPT, G ½ A, G ¼ A male via adapter
■ ½ NPT, G ¼ female via adapter
For optimal performance we suggest to adjust the set point ■ M20 x 1.5 male via adapter
between 25 ... 75 % of the setting range.

WIKA data sheet PV 35.40 ∙ 03/2021 Page 2 of 6

Electrical connection For cable connections to the internal terminal block use wire
■ ½ NPT female (standard) cross-sections between 0.5 ... 2.5 mm2.
■ ¾ NPT, M20 x 1.5, G ½, G ¾ female For the grounding cable connection to the protective conduc-
■ Cable gland non-armoured, nickel-plated brass tor screws use max. 2.5 mm2 for the internal screw and max.
■ Cable gland non-armoured, stainless steel (AISI 304) 4 mm2 for the external screw.
■ Cable gland armoured, nickel-plated brass
■ Cable gland armoured, stainless steel (AISI 304) Dielectric strength
■ MIL connector, 7-pin, DTL 5015 Safety class I (IEC 61298-2: 2008)

Wetted parts, model DC

Setting range Stainless steel version NACE version (option) 1) Monel version (option)
Diaphragm Process con- Diaphragm Process con- Diaphragm Process
nection nection connection
0 ... 160 mbar AISI 316 AISI 316L Monel® 400 AISI 316L Monel® 400
0 ... 250 mbar
0 ... 400 mbar
0 ... 600 mbar
0 ... 1 bar
0 ... 2.5 bar
0 ... 4 bar AISI 304
0 ... 6 bar
0 ... 10 bar
0 ... 16 bar Inconel® 718 Inconel® 718 -
0 ... 25 bar
0 ... 40 bar

1) NACE compliant to MR 0175, ISO 15156 and MR 0103

Wetted parts, model DCC

Setting range Diaphragm Process con-
nection
0 ... 160 mbar Inconel® 718 Aluminium alloy
(EN AW-5082 per
0 ... 250 mbar
EN 573-3)
0 ... 400 mbar
0 ... 600 mbar
0 ... 1 bar
0 ... 1.6 bar
0 ... 2.5 bar
0 ... 4 bar
0 ... 6 bar

Sealing material for all models and versions: NBR

Mounting
■ Mounting fixture from stainless steel (AISI 304)
■ Option: Mounting bracket for 2" pipe mounting (AISI 304)

Weight
■ approx. 5.4 kg, switch enclosure aluminium alloy
■ approx. 5.9 kg, switch enclosure stainless steel

WIKA data sheet PV 35.40 ∙ 03/2021 Page 3 of 6

Setting range, model DC

Δp-cell Setting range Fixed dead band Static / One-sided pressure

for contact version
in bar 1 contact 1 contact in bar
A, B, C G
in mbar in mbar
L 0 ... 0.16 ≤6 ≤ 12 ≤ 40, ≤ 100 or ≤ 160
0 ...0.25 ≤8 ≤ 20
H 0 ... 0.4 ≤ 20 ≤ 40
0 ... 0.6 ≤ 25 ≤ 50
0 ... 1 ≤ 40 ≤ 80
0 ... 2.5 ≤ 70 ≤ 170 ≤ 40, ≤ 100, ≤ 160 or ≤ 250
0 ... 4 ≤ 120 ≤ 200
0 ... 6 ≤ 180 ≤ 250
0 ... 10 ≤ 300 ≤ 400
0 ... 16 ≤ 480 ≤ 600
0 ... 25 ≤ 700 ≤ 1,000
V 0 ... 40 ≤ 1,200 ≤ 1,800 ≤ 40, ≤ 100 or ≤ 160

Other available setting ranges:

■ -40 ... +120 mbar, -60 ... +190 mbar, -200 ... +200 mbar, -300 ... +300 mbar, -500 ... +500 mbar
■ -1.25 ... +1.25 bar, -2 ... +2 bar, -3 ... +3 bar, -5 ... +5 bar, -8 ... +8 bar, -12.5 ... +12.5 bar

Setting range, model DCC 1)

Δp-cell Setting range Fixed dead band Static / One-sided pressure

for contact version
in bar 1 contact 1 contact in bar
A, B, C G
in mbar in mbar
L 0 ... 0.25 ≤5 ≤ 10 ≤ 25
H 0 ... 1 ≤ 30 ≤ 50
0 ... 1.6 ≤ 50 ≤ 110
0 ... 2.5 ≤ 80 ≤ 170
0 ... 4 ≤ 120 ≤ 200
0 ... 6 ≤ 120 ≤ 200

1) For clean gas or non-condensing vapour only

Other setting ranges on request.

Other Versions Assembly

■ Ex ia version ■ Valve manifold for differential pressure measuring
■ Cleaned for oxygen service instruments, models IV30, IV31 and IV50 und IV51
■ Drying of wetted parts see data sheet AC 09.23
■ Offshore version 2) ■ Diaphragm seals, see website
■ NACE compliant to MR 0175, ISO 15156 and MR 0103 2) ■ Differential pressure gauge
■ Wetted parts from Monel
2) WIKA recommends argon gas-filled contact versions
3) Only available for model DC

WIKA data sheet PV 35.40 ∙ 03/2021 Page 4 of 6

Approvals
Logo Description Country
EU declaration of conformity European Community
■ Pressure equipment directive
■ Low voltage directive
■ RoHS directive
■ ATEX directive 1) (option)
IM1
II 1 GD
IECEx 1) (option) IECEx member states
Ex ia I Ma
Ex ia IIC T6/T4 2) Ga
Ex ia IIIC T85/T135 2) Da

EAC (option) Eurasian Economic

Hazardous areas Community
Ex-Ukraine (option) Ukraine
Hazardous areas
CCC (option) China
Hazardous areas
KOSHA (option) South Korea
Hazardous areas

1) Double marking ATEX and IECEx on the same product label

2) The temperature class is related to the ambient temperature range

Manufacturer‘s information and certifications

Logo Description
SIL 2 rating (option), per IEC 61508
Functional safety
Only available with contact version B or C

Certificates (option)
■ 2.2 test report per EN 10204
■ 3.1 inspection certificate per EN 10204

Approvals and certificates, see website

WIKA data sheet PV 35.40 ∙ 03/2021 Page 5 of 6

 Dimensions in mm
Switch enclosure: Aluminium alloy Switch enclosure: Stainless steel 316L

Legend
A ⊖ Process connection C Electrical connection
B ⊕ Process connection V Vent

Assembly examples
Direct mounting with valve manifold Mounting via capillary to diaphragm seals

Ordering information
Model / Static - One-sided pressure / Δp-cell / Switch enclosure / Contact version / Setting range / Process connection /
Electrical connection / Options

© 12/2010 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.
03/2021 EN

WIKA data sheet PV 35.40 ∙ 03/2021 Page 6 of 6

WIKA Alexander Wiegand SE & Co. KG

Alexander-Wiegand-Straße 30
63911 Klingenberg/Germany
Tel. +49 9372 132-0
Fax +49 9372 132-406
info@wika.de
www.wika.de