WIKA DE 紧凑型差压开关 EEx-d防爆 IP65 相对压力 差压和温度

WIKA DE 紧凑型差压开关 EEx-d防爆

IP65 相对压力 差压和温度

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

Compact differential pressure switch model DE

      Applications
      ■ Differential pressure monitoring and direct switching of electrical loads
      ■ 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
      ■ Pump monitoring and control / filter monitoring, level measurement in closed tanks
      ■ 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 -30 ... +85 °C
      ■ 1 switch point, SPDT or DPDT with a high contact rating of up to 15 A / AC 220 V
      ■ Working pressure （static pressure） up to 160 bar

     Description
      These high-quality differential 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 parts materials are from stainless steel or Inconel 718, depending on the measuring range. Each switch family is available in IP 65, Ex-ia or Ex-d versions （Ex-ia see model DC, data sheet PV 35.40）.
      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. A DPDT switch is realised through 2 SPDT switches, which switch simultaneously within 2 % of the full scale value.
      By using a liquid-filled diaphragm measuring cell with fulcrum lever transmission, the model DE pressure switch 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 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, 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 or wall mounting
    Preferred connection location of the process connection should be below.

   Weight
    approx. 5.4 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 3） or tropicalised application 3）
    ■ Version for applications to NACE 3）
    ■ Version for ammonia applications 3）
    ■ Oil and grease free version for oxygen applications
    ■ Wetted parts made of Monel
    ■ Accessories:
    Three-way or five-way valve

    3） Inert gas filled contacts required

   Approvals and certificates
   ■ SIL 2 version 3）
   ■ 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 / Max. working pressure （static pressure） / Sensor code / 2 / Switch contact with version / Setting range / 2 x process connection / 2 x electrical connection / Switch point / Switching direction / Options

       Example: DE - L - H - 2 - 1 - 0/600 mbar - 2 x 1/4“ NPT-F - 2 x 1/2“ NPT-F