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WIKA PXA 迷您型压力开关不锈钢系列 EEx-d防爆 IP66 0-400bar

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联系人：仇立新（销售工程师）

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产品简介

WIKA PXA 迷您型压力开关不锈钢系列 EEx-d防爆 IP66 0-400bar
Mini pressure switch
Ex protection EEx-d, IP 66
Model PXA

详细介绍

WIKA PXA 迷您型压力开关不锈钢系列 EEx-d防爆 IP66 0-400bar

Mini pressure switch
Ex protection EEx-d, IP 66
Model PXA

Mini pressure switch model PXA

            Applications
      ■ Pressure monitoring and direct switching of electrical loads
      ■ For measuring points with limited space
      ■ For gaseous and liquid, aggressive and highly viscous or contaminated media, also in aggressive ambience
      ■ Process industry: chemical/petro-chemical, on- and offshore, technical gases, environmental technology,machine building and general plant construction, water treatment, pharmaceutical industry
      ■ Types of explosion protection
      GAS Ex-d DUST Ex-tD Gr. II Cat. 1/2 GD
      Ex-d IIC T6 and T4
      Ex-tD A21 IP66 T85 and T135

    Special features
     ■ Case made of stainless steel
     ■ Ingress protection IP 66
     ■ Ambient temperature -40 ... +85 °C
     ■ 1 switch point, high contact rating of up to 5 A / AC 220 V
     ■ Setting ranges 1 ... 2.5 bar to 50 ... 400 bar Description
     These high-quality pressure switches have been specifically developed for applications with limited space in hazardous zones.
     High quality and product manufacturing to ISO 9001:2000 ensures 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 parts materials are from Hasloy® C276 or stainless steel as standard. Each switch family is available in IP 66, Ex-ia or Ex-d versions （Ex-ia see model PXS, data sheet PV 34.36）.

In order to ensure as flexible operation as possible, the pressure switches are equipped with micro switches, which make it possible to switch an electrical load of up to 5 A /AC 220 V directly. For smaller contact ratings, such as for
PLC applications, hermetically sealed micro switches with gold-plated contacts can be selected as an option.
By using a disc spring with a prestressed snap-action spiral tube the pressure switch model PXA is extremely reliable and guarantees optimal operating characteristics.

   Switch points
    The switch points can be set to your requirements, free-ofcharge.
   Please specify:
    Switch point, switching direction （e.g. switch point: 0.5 bar,falling）

    After sliding the cover backwards, switch point adjustment can be made using the fine adjustment screw. The switch point is settable within the entire measuring range with the
   following general rule:
    ■ Define the value A = 2x repeatability + switch hysteresis
    ■ If the pressure is rising, the switch point should be set between （min. + value A） up to max. of the setting range.
    ■ If the pressure is falling, the switch point should be set between min. up to （max. - value A） of the setting range.

   Example:
    Setting range: 0 ... 1 bar with one switch contact
    Repeatability: 1 % of 1 bar = 10 mbar
    Switch hysteresis = 15 mbar （see table setting ranges）
    Value A = 2 x 10 mbar + 15 mbar = 35 mbar
    If the pressure is rising, the switch point should be set between 35 mbar up to 1 bar.
    If the pressure is falling, the switch point should be set between 0 up to 965 mbar.
    For optimal performance we suggest the switch point lies between 25 % and 75 % of the setting range.

   Electrical connection
    ½ NPT male, multi-core cable, length 1.5 m, 0.5 mm2,protective conductor connection using internal and external screw, max. earth cable cross-section 4 mm2

  Pressure switch certified per:
   ■ Pressure equipment directive 97/23/EC （PED, annex 1,category IV, safety accessories, module B + D）
   ■ Low voltage directive 73/23 EEC and 93/68 EEC

Dielectric strength
Safety class I （EN 61298-2: 1997-06）

Mounting
Direct mounting in any direction

Weight
approx. 0.6 kg

  Options
   ■ Other process connection, also with adapter
   ■ Electrical connection via terminal box with 3 connections 1/2 NPT female, ingress protection IP 65, permissible temperature -40 ... +60 °C
   ■ Electrical connection 1/2 NPT, 3/4 NPT or M20 x 1.5 （female）
   ■ 2" pipe-mounting kit
   ■ Other cable lengths （3 or 5 m）
   ■ External connection to earth, max. 4 mm2
   ■ Version for off-shore or tropicalised application
   ■ Version for applications to NACE
   ■ Version for ammonia applications
   ■ Oil and grease free version for oxygen applications
   ■ Accessories:
   Pressure gauge valves model 910.11, see data sheet AC 09.02
   Barstock valves model 910.81, see data sheet AC 09.18

Approvals and certificates

   ■ GOST-R certificate
   ■ Test certificate *CA* （confirmation of the switching accuracy）
   ■ Test report *CP* （3-time listing of the switch point, requires switch point specification）
   ■ Material certificate 3.1 per EN 10204

Dimensions in mm

   Ordering information
   Model / Sensor code / Switch contacts with version / Setting range / Process connection / Electrical connection / Switch point / Switching direction / Options
   Example:PXA4 - M - E - 2.5/10 bar - 1/4"NPT-F - 1/2"NPT-M