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WIKA · Pressure measurement · Family BA

Bourdon tube pressure switch

Bourdon tube pressure switch with flameproof enclosure Ex d, suitable for safety-critical applications in chemical, petrochemical, oil and gas, power generation, and water/wastewater industries.
Range
-1…1000 bar
Accuracy
≤ 0.5 % of span
Protection
IP66
RoHSPEDLow voltage directiveUKCAEACEx UkraineCCCINMETROKCsECASCENACEII 1/2 GD (model BAX)II 2 GD (model BA)Ex db IIC T6/T4Ex tb IIIC T85/T135GbGa/GbDbATEXIECEx
Price
On request
Depends on configuration
Request a quote
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Description

These high-quality pressure switches have been developed especially for safety-critical applications. The high quality of the products and manufacturing in accordance with ISO 9001 ensure reliable monitoring of your plant. In production, the switches are traced by quality assurance software at every step and subsequently are 100 % tested. All wetted materials are from stainless steel as a standard.

In order to ensure as flexible operation as possible, the pressure switches are fitted with micro switches, which enable the switching of 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 micro switches with gold-plated contacts can be selected.

for further approvals, see page 5

Process Performance Series

Bourdon tube pressure switch, model BA

Depending on the application, the appropriate variant for the contact version and the electrical connection can be selected; e.g. adjustable dead band instead of fixed dead band is often a feature necessary for control processes.

For applications with special requirements on the wetted parts, a version with Monel  is available.

By using a Bourdon tube measuring system, the model BA and BAX pressure switch is extremely robust and guarantees optimal operating characteristics and the highest measuring performances, with repeatability lower than 0.5 % of span.

For safety applications, the pressure switch is optionally available in a SIL 2-qualified or a SIL 3-qualified version.

Special features

  • No supply voltage needed for the switching of electrical loads
  • Robust switch enclosure from 316L, IP66, NEMA 4X
  • Setting ranges from 0 ... 2.5 bar up to 0 ... 1,000 bar, vacuum ranges
  • Switch point repeatability < 0.5 %
  • 1 or 2 independent set points, SPDT or DPDT, high switching power up to AC 250 V, 20 A
Identification
ModelBA, BAX
Product familyBA
SubcategoryPressure switch
Measuring range
Pressure ranges-1…1.5 bar · -1…5 bar · -1…15 bar · 0…2.5 bar · 0…6 bar · 0…16 bar · 0…40 bar · 0…100 bar · 0…160 bar · 0…250 bar · 0…400 bar · 0…600 bar · 0…1000 bar
Accuracy
Accuracy class≤ 0.5 % of span
Accuracy standardIEC 61298-2:2008
Safety integrity level (SIL)SIL 2-qualified, SIL 3-qualified
Process conditions
Process connection
¼ 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 adapter1/4 NPT, female thread1/2 NPT, female thread via adapter1/2 NPT, male thread via adapterG1/4, female thread via adapterG1/2A, male thread via adapterG1/4A, male thread via adapter
Process temperature−40…+85 °C
Electrical characteristics
Electrical connection½ NPT female
Switching functionSPDT, DPDT
Switching contacts2
Materials
Case materialAluminium alloy, copper-free, painted with acrylic paint
Wetted parts materialStainless steel AISI 316L, Inconel 718 (2.4668), Monel 400, 17-4PH (1.4542), Stainless steel 17-4PH (1.4542), Stainless steel 17-4PH® (1.4542), Monel®400
Operating environment
Ambient temperature−60…+85 °C
IP ratingIP66
Weight2.4 kg
Certifications and approvals
Certifications
RoHSPEDLow voltage directiveUKCAEACEx UkraineCCCINMETROKCsECASCENACE
Explosion protection
II 1/2 GD (model BAX)II 2 GD (model BA)Ex db IIC T6/T4Ex tb IIIC T85/T135GbGa/GbDbATEXIECExEx db IIC T6/T4 Ga/Gb, Ex tb IIIC T85/T135 Db (model BAX)Ex db IIC T6/T4 Gb, Ex tb IIIC T85/T135 Db (model BA)
Additional details
Datasheet languagesEN, DE
Tables from datasheet
Basic information
VersionBourdon tube pressure switch, flameproof enclosure Ex d
Special design feature■ 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 for hydrogen (H 2 ) applications ■ 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
Contact version→See table &#x27;Contact version&#x27;
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 strengthSafety class I (IEC 61298-2: 2008)
Switch enclosure
DesignHousing cover can be secured against unauthorised access with screw locking. Laser-engraved product label from stainless steel.
MaterialAluminium alloy, copper-free, painted with acrylic paint
Mounting 2)■ Direct mounting ■ Mounting bracket for 2" pipe mounting from stainless steel AISI 304 ■ Wall mounting (only available for model BA) ■ Wall bracket from stainless steel AISI 304 (only available for model BAX)
Contact versionElectrical rating (resistive load)
ACDC
With fixed dead band
UN1 x SPDT, silver250 V, 15 A24 V, 2 A, 125 V, 0.5 A, 220 V, 0.25 A
US1 x SPDT, silver, hermetically sealed, argon gas filling 1)250 V, 15 A24 V, 2 A, 220 V, 0.5 A
UO1 x SPDT, gold-plated, hermetically sealed, argon gas filling 1)125 V, 1 A24 V, 0.5 A
UG1 x SPDT, gold-plated125 V, 1 A24 V, 0.5 A
DN2 x SPDT or 1 x DPDT, silver250 V, 15 A24 V, 2 A, 125 V, 0.5 A, 220 V, 0.25 A
DS2 x SPDT or 1 x DPDT, silver, hermetically sealed, argon gas filling 1)250 V, 15 A24 V, 2 A, 220 V, 0.5 A
DO2 x SPDT, or 1 x DPDT gold-plated, hermetically sealed, argon gas filling 1)125 V, 1 A24 V, 0.5 A
DG2 x SPDT or 1 x DPDT, gold-plated125 V, 1 A24 V, 0.5 A
With adjustable dead band
UR1 x SPDT, silver250 V, 20 A24 V, 2 A, 220 V, 0.5 A
RR 2)2 x SPDT or 1 x DPDT, silver250 V, 15 A24 V, 2 A, 220 V, 0.5 A
With fixed dead band and adjustable dead band
DR 2)2 x SPDT, silver (1 x UN + 1 x UR)250 V, 15 A24 V, 2 A, 220 V, 0.5 A
Accuracy specifications
Set point repeatability≤ 0.5 %of span of setting range
Dead band→See table &#x27;Setting range&#x27;
Setting range
ModelSetting range (=working range)Proof pressureFixed dead bandAdjustable dead band
in barin bar1 contact, UN, US, UO, UG in bar2 contacts, DN, DS, DO, DG in bar1 contact, UR in bar
Model BAModel BAX
BA-1 ... +1.54.5≤ 0.15≤ 0.30-0.35 ... 1.10
-1 ...+512≤ 0.20≤ 0.30-0.55 ... 1.70
-1 ...+1530≤ 0.30≤ 0.40-1.40 ... 3.10
0 ... 2.54.5≤ 0.15≤ 0.30-0.35 ... 1.10
0 ... 612≤ 0.20≤ 0.30-0.55 ... 1.70
0 ... 1630≤ 0.30≤ 0.40-1.40 ... 3.10
BA, BAX0 ... 4075≤ 0.80≤ 0.70≤ 1.22.10 ... 6.00
0 ... 100160≤ 2≤ 2≤ 56 ... 17
0 ... 160210≤ 3≤ 3≤ 713 ... 35
0 ... 250330≤ 5≤ 5≤ 1021 ... 65
0 ... 400480≤ 8≤ 8≤ 1226 ... 93
0 ... 600720≤ 12≤ 12≤ 2040 ... 115
BAX0 ... 1,000 1)1,200≤ 20-≤ 5075 ... 190
View all (13)
Process connection
Standard■ ANSI/ASME B1.20.1 ■ DIN EN ISO 228
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
Material (wetted)
Sensor elementDepending on the selected version
Process connection→See table &#x27;Wetted parts&#x27;
Wetted parts
VersionBourdon tubeProcess connection
StandardStainless steel AISI 316L
Setting range: 0 ... 1,000 barStainless steel 17-4PH  (1.4542)Stainless steel AISI 316L
NACE Setting range: 0 ... 40 to 0 ... 400 barMonel  400Stainless steel AISI 316L
Monel  Setting range: 0 ... 40 to 0 ... 400 barMonel  400
Electrical connection
Connection type■ ½NPTfemale (standard) ■ ¾NPT, Gk ½, Gk ¾, M20 x 1.5 female ■ Cable gland non-armoured, Ex d, nickel-plated brass ■ Cable gland non-armoured, Ex d, AISI 304 ■ Cable gland armoured, Ex d, nickel-plated brass ■ Cable gland armoured, Ex d, AISI 304
Wire cross-sectionUse 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 assignmentConnection details are given on the product label of the instrument. Connection terminals and the ground terminal are appropriately marked.
Operating conditions
Medium temperature range-40 ...+85 °C
Ambient temperature rangeT6/T85°C T a -60 ...+60
T4/T135°C T a -60 ...+85
Ingress protection of the complete instrumentIP66 per EN/IEC 60529 (NEMA 4X)
WeightApprox. 2.4 kg for model BA Approx. 3.7 kg for model BAX
LogoDescriptionRegion
EU declaration of conformity Pressure equipment directive PED, annex 1, category IV, safety accessories, module B + D Low voltage directive RoHS directive ATEX directive 1)European Union
IECEx 1) Ex db IIC T6/T4 2) Ga/Gb, Ex tb IIIC T85/T135 2) Db (model BAX) Ex db IIC T6/T4 2) Gb, Ex tb IIIC T85/T135 2) Db (model BA)International
LogoDescriptionRegion
UKCAUnited 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 Hazardous areas 1)Eurasian Economic Community
Ex Ukraine Hazardous areas 1)Ukraine
CCC Hazardous areas 1)China
INMETRO Hazardous areas 1) (only available for model BA)Brazil
KCs Hazardous areas 1)South Korea
-ECAS Hazardous areas 1)United Arab Emirates
LogoDescription
SIL3 IEC 61508 / IEC 61511SIL 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 interval1 year (dependent on conditions of use)
ModelDescription
910.15Syphons →See data sheet AC 09.06
910.13Overpressure protector →See data sheet AC 09.04
IV10, IV11Needle valve and multiport valve →See data sheet AC 09.22
IV20, IV21Block-and-bleed valve →See data sheet AC 09.19
IVMMonoflange, process and instrument version →See data sheet AC 09.17
BVBall valve, process and instrument version →See data sheet AC 09.28