WIKA PCA 紧凑型压力开关 EEX-d防爆 IP65 相对压力 差压 温度

WIKA PCA 紧凑型压力开关 EEX-d防爆

IP65 相对压力 差压 温度

Compact pressure switch
Ex protection EEx-d, IP 65
Model PCA

 
Compact pressure switch model PCA

      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
      ■ Ignition protection type GAS Ex-d DUST Ex-tD Gr. II Cat. 1/2 GD

     Special features
     ■ Case flameproof enclosure
     ■ Ingress protection IP 65, NEMA 4
     ■ Ambient temperature -40 ... +85 °C
     ■ 1 switch point, SPDT or DPDT with a high contact rating of up to 15 A / AC 220 V
     ■ Setting ranges from 200 mbar, max. test pressure up to 250 bar

    Description
    These high-quality pressure switches have been specifically developed for safety-critical applications with limited space. High quality and product manufacturing to ISO 9001:2000 nsures reliable monitoring of your plant. In production, the switches are traced by quality assurance software at every
step and subsequently are 100 % tested.
    The gauge adapters are made of stainless steel, the diaphragm is, depending on the measuring range and the sensor code, made of Inconel or coated with NBR or
PTFE. Each switch family is available in IP 65, Ex-ia or Ex-d versions （Ex-ia see model PCS, data sheet PV 33.30）.

    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 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. For two separate circuits the switches are also available in the version DPDT （double change-over contact）.
    By using a diaphragm with an antagonist spring, the model PCA pressure switch is extremely robust and guarantees optimal operating characteristics at very high pressures.

   
     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 = 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 female, cable connection using internal terminal block, ground connection using internal and external screw,max. ground 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 61 298-2: 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 access to internals is from front of the enclosure and the electrical connection is placed on side.
    

    Weight
     approx. 1.0 kg

    Options
    ■ Other process connection, also with adapter

    ■ Case made of stainless steel 316
    ■ Wiring 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 5） 6） or tropicalised application 5）
    ■ Version for applications to NACE 5） 6）
    ■ Version for ammonia applications 6）
    ■ 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

    5） Not in connection with sensor code V
    6） Inert gas filled contacts required

   Approvals and certificates
   ■ SIL 2 version 6）
   ■ 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 / Case / Sensor code / Switch contacts with version / Setting range / Process connection / Electrical connection / Switch point（s） / Switching direction（s） / Options
   Example: PCA 2 M1 - 4/25 bar - 1/4"NPT-F - 1/2"NPT-F