WIKA MA1 膜片式壓力開關 EEx-d 防爆
IP65 過壓100bar PED證書
Diaphragm pressure switch
Ex protection Ex-d, IP 65
Model MA1
              Diaphragm pressure switch model MA1
 
     Applications
      ■ Pressure monitoring and direct switching of electrical loads
      ■ For measuring points with increased overpressure
      ■ For gaseous and liquid, aggressive and highly viscous or contaminated media, also in aggressive ambience
      ■ Process industry: Chemical/petrochemical, on- and offshore, technical gases, environmental technology,machine building and general plant construction, water treatment, pharmaceutical industry

      Special features
     ■ Case flameproof enclosure
     ■ Ingress protection IP 65, NEMA 4
     ■ Ambient temperature -40 ... +85 °C
     ■ 1 or 2 independent switch points, high contact rating up to 15 A / AC 220 V
     ■ Setting ranges from 200 mbar, max. test pressure up to 40 bar
 
    
    Description
     These high-quality pressure switches have been developed especially for safety-critical applications. The high quality of the products ensures reliable monitoring of your plant. The manufacturer Cella is certified to ISO 9001. In production, the
switches are traced by quality assurance software at every step and subsequently are 100 % tested.
     All wetted materials are made from stainless steel as a standard. Each switch family is available in IP65, Ex-ia or Ex-d versions.
     In order to ensure as flexible operation as possible, the pressure switches are equipped with micro switches, whichmake it possible to switch an electrical load of up to 15 A / AC 220 V directly. For smaller contact ratings, such as for PLC applications, Argon gas-filled micro switches with gold-plated contacts can be selected as an option.
     By using a diaphragm measuring system, the model MA1 pressure switch is extremely robust and guarantees optimal operating characteristics. For applications requiring particularly high corrosion protection, variants with PTFE or
Monel wetted parts are available.
    
 
       Switch points
     The switch points can be set to your requirements, free-ofcharge.
     Please specify:
     Switch point, switching direction for each contact (e.g. switch point 1: 0.5 bar, falling, switch point 2: 3 bar, rising)
     With two micro switches, the switch points can be set independently of each other.
    
     After unscrewing the case cover, switch point adjustment can be made using the adjustment screw. The switch point is settable within the entire measuring range with the following
    general rule:
     ■ Define the value A = 2 x 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 female, cable connection using internal terminal block, protective conductor connection using internal and xternal 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 or wall mounting
     Preferred connection location of the process connection should be below. Alternatively the instrument can be installed so that internal access is from the front of the enclosure and the electrical connection is located on the side.

 
     Weight
     approx. 3.1 kg


 
 
     Options
     ■ Other process connection, also with adapter
     ■ Electrical connection 3/4 NPT, G 1/2 or M20 x 1.5 (female)
     ■ Cable gland on request
     ■ 2"; pipe-mounting kit (with clamping element)
     ■ Version for off-shore or tropicalised application 9)
     ■ Version for applications to NACE 9) 10)
     ■ Version for ammonia applications 9)
     ■ 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
 
 
 
     9) Inert gas filled contacts required
    10) Max. test pressure 100 bar only with setting ranges 0 ... 16 bar and 0 ... 25 bar
    11) Max. 1 switch contact

 
   Approvals and certificates
    ■ SIL 2 version 9) 11)
    ■ 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
 
   Ordering information
    Model / Wetted parts / Switch contacts with version / Setting range / Process connection / Electrical connection / Switch point(s) / Switching direction(s) / Options
    Example: MA1 - TX - U1 - 0/6 bar - 1/4";NPT-F - 1/2";NPT-F 
 
 
歡迎致電咨詢訂購WIKA MA1 膜片式壓力開關 EEx-d 防爆 IP65 過壓100bar PED證書
電話:010-51669912 56291930 
傳真：010-51669912
QQ：823377546 1491421115 2636968574
郵箱：sales@
公司官網  

加工定制 : 是 ;
產品認證 : CE ;
最大工作壓力 : 100bar（Pa） ;
機械壽命 : 100（萬次） ;
額定電流 : 15（A） ;
額定電壓 : 220（V） ;
類型 : 機械壓力開關 ;
型號 : MA1 ;
品牌 : WIKA/威卡 ;

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