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WIKA · Pressure measurement · Family MW

Diaphragm pressure switch

Name: Diaphragm pressure switch
Brand: WIKA

Diaphragm pressure switch for safety-critical applications in process industries, suitable for gaseous and liquid, aggressive and highly viscous or contaminated media.

Range

-1…600 bar

Accuracy

Set point repeatability ≤ 1 % of span

Protection

IP66

RoHSNACE MR0175/ISO 15156NACE MR0103/ISO 17945EN 1854EN 12952EN 12953PEDLow voltage directiveUKCAEACEx UkraineCCCKCs-ECASCEATEX: II 1 GDNACE MR0175 / ISO 15156NACE MR0103 / ISO 17945Ex iaEx ia I MaEx ia IIC T6/T4 GaEx ia IIIC T85℃/T135℃ Da IP66

Price

On request

Depends on configuration

Request a quote

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Description

These high-quality mechanical pressure switches have been developed especially for safety-critical applications. The great advantage of mechanical pressure switches is that no supply voltage is required for the switching process.

In production, the switches are traced by quality assurance software at every step and subsequently are 100 % tested. The robust switch enclosure from stainless steel 316L can withstand the rough and corrosive operating conditions of the process industry with working ranges of up to 600 bar. The pressure switch is fitted with 1 or 2 microswitches, which make it possible to switch an electrical load of up to

AC 250 V, 20 A directly.

For lower switching power ratings, such as for PLC applications, argon gas-filled microswitches with gold-plated contacts are available.

for further approvals, see page 6

Special features

Case from 316L, IP66, NEMA 4X
Setting ranges from 16 mbar to 600 bar, also all other equivalent vacuum or combined pressure and vacuum ranges
Intrinsic safety Ex ia available
1 or 2 independent switch points, high switching power up to AC 250 V, 20 A
Switch point repeatability < 1 %

Identification

Model	MW
Subcategory	Diaphragm pressure switch

Measuring range

Pressure ranges

0…100 mbar · 0…16 mbar · -100…0 mbar · -1…1.5 bar · -1…5 bar · -1…9 bar · -1…15 bar · 0…0.2 bar · 0…0.4 bar · 4…40 bar · 10…100 bar · 10…250 bar · 20…400 bar · 30…600 bar · 0…0.016 bar · 0…40 bar

Accuracy

Accuracy class	Set point repeatability ≤ 1 % of span
Accuracy standard	IEC 61298-2:2008
Safety integrity level (SIL)	SIL 2-qualified or SIL 3-qualified per IEC 61508 / IEC 61513

Process conditions

Process connection

M20x1.5¼ NPT, female thread½ NPT, female thread via adapter½ NPT, male thread via adapterG ¼, female thread via adapterG ½ A, male thread via adapterG ¼ A, male thread via adapterASME B16.5EN 1092-1¾ NPTG ½G ¾G 1/2 B1/2 NPTASME B16.5 Class 150/300/600EN 1092-1 PN10/401/4 NPT female1/2 NPT female (via adapter)1/2 NPT male (via adapter)G1/4 female (via adapter)G1/2A male (via adapter)G1/4A male (via adapter)ASME B16.5 flangeEN 1092-1 flange

Process temperature

−40…+85 °C

Electrical characteristics

Electrical connection	Internal terminal block, cable gland (nickel-plated brass or stainless steel), MIL connector 7-pin DTL 5015
Switching function	1 or 2 independent switch points, SPDT or DPDT, fixed or adjustable dead band
Switching contacts	2

Materials

Case material	Stainless steel 316L
Wetted parts material	Stainless steel 316, Stainless steel 316L, PTFE, Monel, Hastelloy C276, FPM, NBR
Sealing material	FPM, NBR, PTFE, welded diaphragm element

Operating environment

Ambient temperature	−60…+85 °C
IP rating	IP66
Weight	1 kg

Certifications and approvals

Certifications	RoHSNACE MR0175/ISO 15156NACE MR0103/ISO 17945EN 1854EN 12952EN 12953PEDLow voltage directiveUKCAEACEx UkraineCCCKCs-ECASCE
Explosion protection	ATEX: II 1 GDIECEx: Ex ia I Ma, Ex ia IIC T6/T42, Ex ia IIIC T85°C/T135°C2 DaNACE MR0175 / ISO 15156NACE MR0103 / ISO 17945EN 1854EN 12952EN 12953Ex iaEx ia I MaEx ia IIC T6/T4 GaEx ia IIIC T85℃/T135℃ Da IP66

Additional details

Datasheet languages

Tables from datasheet

Basic information
Version	Diaphragm pressure switch
Special design feature	■ Version for hazardous areas (Ex ia) ■ For oxygen, oil- and grease-free ■ Per NACE 1) MR0175 / ISO 15156, use in H₂S-containing environments in oil and gas production ■ Per NACE 1) MR0103 / ISO 17945, metals resistant to sulphide stress cracking ■ Version compliant with EN 1854, pressure sensing devices for gas burners and gas burning appliances ■ Version compliant with EN 12952 and EN 12953, limiting devices in water- tube and shell boilers ■ Drying of wetted parts ■ Offshore version ■ Tropical version (suitable for environments with increased air humidity) ■ Version for ammonia applications ■ Geothermal version ■ Low-temperature version to -60 °C ■ Assembled as a diaphragm seal system ■ Additional protection from stainless steel 316L or Hastelloy for setting ranges 2.5 ... 25 bar
Contact version	→See table 'Contact version'
Function	■ 1 x SPDT (single pole double throw) ■ 2 x SPDT (single pole double throw) ■ 1 x DPDT (double pole double throw) The DPDT function is realised with 2 simultaneously triggering SPDT microswitches, within 0.2 %of span.
Dead band	■ 1 or 2 contacts with fixed dead band ■ 1 or 2 contacts with adjustable dead band ■ 1 contact with fixed dead band and 1 contact with adjustable dead band
Dielectric strength	Safety class I (IEC 61298-2: 2008)
Switch enclosure
Design	Case cover with bayonet lock, protection against unauthorised access by lead sealing possible. Laser-engraved product label from stainless steel.
Material	Stainless steel 316L
Mounting 2)	■ Direct mounting ■ Wall bracket from stainless steel AISI 304 ■ Mounting bracket for 2" pipe mounting from stainless steel AISI 304

Contact version	Electrical rating (resistive load)	Suitable for
		AC	DC	Ex ia option
With fixed dead band
UN	1 x SPDT, silver	250 V, 15 A	24 V, 2 A, 125 V, 0.5 A, 220 V, 0.25 A	No
US	1 x SPDT, silver, hermetically sealed, argon gas filling 1)	250 V, 15 A	24 V, 2 A, 220 V, 0.5 A	Yes
UO	1 x SPDT, gold-plated, hermetically sealed, argon gas filling 1)	125 V, 1 A	24 V, 0.5 A	Yes
UG	1 x SPDT, gold-plated	125 V, 1 A	24 V, 0.5 A	Yes
DN	2 x SPDT or 1 x DPDT, silver	250 V, 15 A	24 V, 2 A, 125 V, 0.5 A, 220 V, 0.25 A	No
DS	2 x SPDT or 1 x DPDT, silver, hermetically sealed, argon gas filling 1)	250 V, 15 A	24 V, 2 A, 220 V, 0.5 A	Yes

Contact version	Electrical rating (resistive load)	Suitable for Ex ia option
		AC	DC
DO	2 x SPDT, or 1 x DPDT gold-plated, hermetically sealed, argon gas filling 1)	125 V, 1 A	24 V, 0.5 A	Yes
DG	2 x SPDT or 1 x DPDT, gold-plated	125 V, 1 A	24 V, 0.5 A	Yes
With adjustable dead band
UR	1 x SPDT, silver	250 V, 20 A	24 V, 2 A, 220 V, 0.5 A	Yes 2)
RR 3)	2 x SPDT or 1 x DPDT, silver	250 V, 15 A	24 V, 2 A, 220 V, 0.5 A	Yes 2)
With fixed dead band and adjustable dead band
DR 3)	2 x SPDT, silver (1 x UN + 1 x UR)	250 V, 15 A	24 V, 2 A, 220 V, 0.5 A	Yes 2)

Sensor element	Model	Wetted parts	Permissible medium 1)
			Sensor element	Process connection	temperature
Setting range 0 …16mbar to 0 …40bar
XX 2)	Diaphragm element	MWB,MW	Stainless steel 316 3)	Stainless steel 316L	-30 ...+85 °C
TX	Diaphragm element	MWB,MW	Stainless steel 316 3) + PTFE 4)	Stainless steel 316L	-30 ...+85 °C
TT	Diaphragm element	MWB,MW	Stainless steel 316 3) + PTFE 4)	Stainless steel 316L + PTFE	-30 ...+85 °C
KK 2)	Diaphragm element	MWB,MW	Monel 5)	Monel	-30 ...+85 °C
KX 2)	Diaphragm element	MWB,MW	Monel 5)	Stainless steel 316L	-30 ...+85 °C
Setting range 4 …40bar to 30 …600 bar
GXX 6)	Piston with welded diaphragm element	MWG	Hastelloy C276	Stainless steel 316L	-40 ...+85 °C
HXX 7)	Piston with O-ring sealing from FPM	MWH	Stainless steel 316	Stainless steel 316L	0 ... 85 °C
Piston with O-ring sealing from NBR	MWH	Stainless steel 316	Stainless steel 316L	-10 ...+85 °C

View all (20)

Accuracy specifications

Set point repeatability	≤ 1 %of span of setting range
Dead band	→See table 'Setting range'

Setting range for modelMWB Span of setting range from 16 mbar to max. 100 mbar

Standard	Variant 1	Variant 2	Dead band
Setting range (= working range)	Proof pressure	Working range	Proof pressure	Working range	Proof pressure	1 contact, fixed	2 contacts, fixed	1 contact, adjustable
in mbar	in bar	in bar	in bar	in bar	in mbar	in mbar	in mbar
0 ... 16	250	0 ... 8	10	-1 ... 8 1)	10	≤ 2.0	≤ 2.8	-
0…25	250	0 ... 8	10	-1 ... 8 1)	10	≤ 2.0	≤ 3	8 …18
0…40	300	0…8	10	-1 ... 8 1)	10	≤ 2.6	≤ 3.4	8…20

Setting range for modelMWB Span of setting range from 16 mbar to max. 100 mbar

Standard	Variant 1	Variant 2	Dead band
Setting range (= working range)	Proof pressure	Working range	Proof pressure	Working range	Proof pressure	1 contact, fixed	2 contacts, fixed	1 contact, adjustable
in mbar		in bar	in bar	in bar	in bar	in mbar	in mbar	in mbar
0 ... 60	300	0…8	10	-1 ... 8 1)	10	≤ 3.0	≤ 4.2	12…25
0 ... 100	600	0…8	10	-1 ... 8 1)	10	≤ 3.6	≤ 5	17…40
-16 ... 0	-21	-1…0 1)	0.25	-	-	≤ 2.0	≤ 2.8	-
-25 ... 0	-35	-1…0 1)	0.25	-	-	≤ 2.0	≤ 3	8…18
-40 ... 0	-55	-1…0 1)	0.30	-	-	≤ 2.6	≤ 3.4	8…20
-60 ... 0	-90	-1…0 1)	0.30	-	-	≤ 3.0	≤ 4.2	12…25
-100 ... 0	-150	-1…0 1)	0.40	-	-	≤ 3.6	≤ 5	17…40
-12.5 ... +12.5	-25 / 250	-	-	-	-	≤ 2.0	≤ 3	8…18
-30 ... +30	-60 / 250	-	-	-	-	≤ 3.0	≤ 4.2	12…25
-50 ... +50	-100 / 250	-	-	-	-	≤ 3.6	≤ 5	17…40

Setting range for modelMW Span of setting range from 0.2 bar to max. 40 bar

Standard	Variant 1	Variant 2	Dead band
Setting range (= working range)	Proof pressure	Working range	Proof pressure	Working range	Proof pressure	1 contact, fixed	2 contacts, fixed	1 contact, adjustable
in bar	in bar	in bar	in bar	in bar	in mbar	in mbar	in mbar
0 ... 0.2	0.4	0…32	40	-1…32 1)	40	≤ 10	≤ 13	30 …70
0 ... 0.4	1	0…32	40	-1…32 1)	40	≤ 15	≤ 20	40 ... 95
-0.2 ... 0	-0.3	-1…0 1)	-1	-1 ... 8	10	≤ 10	≤ 13	30…70
-0.4 ... 0	-0.6	-1…0 1)	-1	-1 ... 8	10	≤ 15	≤ 20	40…95
-0.1 ... + 0.1	-0.2 / 1	-	-	-	-	≤ 10	≤ 13	30…70
-0.5 ... 0.5	-1 / 4	-	-	-	-	≤ 15	≤ 50	75 ... 170
-1 ... 0	-1	-1…8	10	-	-	≤ 15	≤ 50	75 …170
-1 ... 1.5	2	-1…8	10	-	-	≤ 48	≤ 67	200 …500
-1 ... 5	12	-1…32	40	-1…80	100 2)	≤ 100	≤ 160	400 …1,000
-1 ... 9	20	-1…32	40	-1…80	100 2)	≤ 100	≤ 180	600 …1,400
-1 ... 15	25	-1…32	40	-1…80	100 2)	≤ 150	≤ 250	1,000 …2,400
0 ... 1	4	0…32	40	-1…32	40	≤ 15	≤ 50	75 …170
0 ... 1.2	4	0…32	40	-1…32	40	≤ 15	≤ 50	75 …170
0 ... 2.5	5	0…32	40	-1…80	100 2)	≤ 48	≤ 67	200 …500
0 ... 6	12	-1…32	40	-1…80	100 2)	≤ 100	≤ 160	400 …1,000
0 ... 10	20	-1…32	40	-1…80	100 2)	≤ 100	≤ 180	600 …1,400
0 ... 16	25	-1…32	40	-1…80	100 2)	≤ 150	≤ 250	1,000 …2,400
0 ... 25	40	-1…32	40	-1…80	100 2)	≤ 300	≤ 450	1,700 …4,000
0 ... 40	50	-	-	-	-	≤ 400	≤ 800	2,200 …5,800

Setting range for modelsMWGandMWH Setting range to 600 bar

Standard	Dead band
Setting range (= working range)	Proof pressure	1 contact, fixed	2 contacts, fixed	1 contact, adjustable 1)
in bar	in bar	in bar	in bar
4 ... 40	100	≤ 3	≤ 4	5…11to8…15
10 ... 100	200	≤ 4	≤ 6	10 …22to15…28
10 ... 250	400	≤ 10	≤ 13	15 …38to27…55
20 ... 400	600	≤ 10	≤ 25	35 …80to43…90
30 ... 600	700	≤ 20	≤ 25	45 ... 105 to 83 ... 155

Process connection
Standard	■ ANSI/ASME B1.20.1 ■ DIN EN ISO 228 ■ ASME B16.5 1) ■ EN 1092-1 1)
Size
ANSI/ASME B1.20.1	■ ¼NPT, female thread ■ ½NPT, female thread via adapter ■ ½NPT, male thread via adapter
DIN EN ISO 228	■ G¼, female thread via adapter ■ G½A,male thread via adapter ■ G¼A,male thread via adapter
ASME B16.5 1)	Flange variant 'S' :With fixed stud bolts and included nuts and washers
EN 1092-1 1)	Flange variant 'T' :With through-holes and extension pipe →See dimensions from page 9
Material (wetted)
Sensor element	Depending on the selected sensor element →See table 'Sensor element'
Process connection
Sealing	PTFE, FPM, NBR, without sealing: welded diaphragm element, depending on setting range and operating conditions. →See table 'Setting range'

Electrical connection

Connection type	■ Female thread½NPT ■ Female thread M20 x 1.5 ■ Female thread ¾NPT, G½, G¾, M20 x 1.5 ■ Cable gland non-armoured, nickel-plated brass ■ Cable gland non-armoured, stainless steel (AISI 304) ■ Cable gland armoured, nickel-plated brass ■ Cable gland armoured, stainless steel (AISI 304) ■ MIL connector, 7-pin, DTL 5015
Wire cross-section	Use 0.5 ... 1.5 mm² (20 ... 16 AWG) for internal terminal block (also suitable for cable lugs). For the grounding cable connection to the protective conductor use max. 4 mm² for the internal and external screw.
Pin assignment	Connection details are given on the product label of the instrument. Connection terminals and the ground terminal are appropriately marked.

Operating conditions

Medium temperature range	Depending on sensor element and sealing →See table 'Sensor element'
Ambient temperature range	T6/T85°C T a -60 ...+60 °C
	T4/T135°C T a -60 ...+85 °C
	Non-Ex versions ■ -40 ...+85 °C ■ -60 ...+85 °C
Ingress protection of the complete instrument	IP66 per EN/IEC 60529 (NEMA 4X)
Weight	Approx. 1.0 kg for modelsMW,MWG,MWH Approx. 1.5 kg for modelMWB

Description	Region
EU declaration of conformity	European Union
Pressure equipment directive PED, annex 1, category IV, safety accessories, module B + D
Low voltage directive
RoHS directive

Logo	Description	Region
	EU declaration of conformity ATEX directive 1) IM1	European Union
	II1GD IECEx 1)	International

Logo	Description	Region
	UKCA	United Kingdom
	Pressure equipment (safety) regulations
	Electrical equipment designed for use within certain voltage limits in support of the electrical equipment (safety) regulations
	Restriction of hazardous substances (RoHS) regulations
	Equipment and protective systems intended for use in potentially explosive atmospheres regulations 1)
	EAC	Eurasian Economic Community
	Low voltage directive (applies only for non-Ex versions)
	Hazardous areas 1)
	Ex Ukraine Hazardous areas 1)	Ukraine
	CCC Hazardous areas 1)	China
	KCs Hazardous areas 1)	South Korea
-	ECAS Hazardous areas 1)	United Arab Emirates

Logo	Description
SIL3 IEC 61508 / IEC 61511	SIL 3-capable (option) Functional safety per IEC 61508 Contains performance level calculation per ISO 13849-1

Certificates

Certificates	■ 2.2 test report per EN 10204 (e.g. state-of-the-art manufacturing, indication accuracy) ■ 3.1 inspection certificate per EN 10204 (e.g. indication accuracy)
Recommended calibration interval	1 year (dependent on conditions of use)

Safety-related characteristic values (Ex)

Voltage	Ui = DC 30V
Current	Ii = 100mA
Power	P i = 750mW
Effective internal capacitance	Ci = 0 μF
Effective internal inductance	Li=0mH

DN	Class	Dimensions in mm[in]
		D	b	a	P	L
½"	150	110 [43,31]	25 [9,84]	60,3 [23,74]	4 x M14	51 [20,08]
	300	110 [43,31]	25 [9,84]	66,7 [26,26]	4 x M14	51 [20,08]
¾"	150	110 [43,31]	25 [9,84]	69,8 [27,48]	4 x M14	51 [20,08]
1"	150	110 [43,31]	25 [9,84]	79,4 [31,26]	4 x M14	51 [20,08]
	300	150 [59,06]	25 [9,84]	88,9 [35]	4 x M16	54 [21,26]
1 ½"	150	150 [59,06]	25 [9,84]	98,4 [38,74]	4 x M14	51 [20,08]
	300	150 [59,06]	25 [9,84]	114,3 [45]	4 x M20	60 [23,62]
2"	150	150 [59,06]	25 [9,84]	120,6 [47,48]	4 x M16	54 [21,26]
	300	165 [64,96]	22 [8,66]	127 [50]	8 x M16	54 [21,26]

DN	PN	Dimensions in mm[in]
		D	b	a	P	L
15	10/40	110 [43,31]	25 [9,84]	65 [25,59]	4 x M12	48 [18,9]
20	10/40	110 [43,31]	25 [9,84]	75 [29,53]	4 x M12	48 [18,9]
25	10/40	110 [43,31]	25 [9,84]	85 [33,46]	4 x M12	48 [18,9]
40	10/40	150 [59,06]	25 [9,84]	110 [43,31]	4 x M16	54 [21,26]