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Home / WITT
6

Maximum Level Switches NGX

Category: WITT

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  • Description
  1. INTENDED USE
    The maximum level switch NGX with TÜV design approval (certificate No. 968/EL 743.00/11) is designed to protect compressors within a refrigeration plant against liquid hammer (e.g. to conform with TRAS110). The maximum level switch is not suitable to be used as a minimum level switch or level switch.
  2. RANGE OF OPERATION
    The mechanical operated NGX can be used on surge drums and liquid receivers and is suitable for all common refrigerants with a density ρ of at least 600 kg/m³. Even when electrical level switches are installed, the use of the design-approved NGX, to switch off the compressors, is mandatory.
    3. SCOPE OF DELIVERY (STANDARD)
    Sensor NGX with junction box
    Brackets to connect the NGX to the 1“ of the stop valve
    Stop valve EA 32 – G1“-I
    Relay BNRt (for installation in the switch gear, see installation instructions W 4651-6.11-)

         Optional
         Stop valve in stainless steel
Socket connection G 1“-NGX (when used with foreign valves)

  1. Detail
    A) Switch
    Housing material: 1.4571
    Balancing bar: PTFE/
    Connection: G 1“ outer thread
    Pressure- / Temp.-Range: PB 25 bar / +80°C to –50°C
    Weight: 0.6 kg
    B) Junction box
    Material: Aluminum
    Dimensions: 63 x 58 x 40 mm
    Protection Class: IP 65
    Connections: 2 x PG 9
    Weight: 0.36 kg (Junction box with brackets)
    C) Brackets
    Material: PP – black
    Dimensions: 60 x 71 x 30 mm, hole appr. ø 42 mm
    With EA 32 /G1” or EA 40/G1” valve
    D) Reed-Contact
    Voltage: 14 V AC/DC
    Current: max. 0.5 A
    Cycles: 1000 / s
    Contact: Rhodium
  1. DESCRIPTION OF OPERATION
    The switching activating point is located in the center line. Therefore the center line of the maximum level switch
    determines the maximum level in the vessel that is used for the control. In the NGX housing there is a balancing
    bar, which consists on one side of PTFE and on the other side there is a magnet fitted (these are the only
    materials in contact with refrigerant). When the refrigerant level rises within the surge drum to the connection of
    the NGX, the PTFE float will get in contact with refrigerant and start to drift up. The magnet on the other side of
    the balancing bar will move downwards. A reed-contact that is installed outside of the refrigerant surrounding will
    recognize the position of the magnet and will open when about 4mm are passed in the bottom position. The
    signal will be transferred through the relay BR-NWt and an auxiliary contactor within the switchgear to the compressor control.
    An LED display connected in series with the reed-switch is illuminated during normal operation. If the LED is not
    illuminated the following reasons might occur:
    The maximum level in the surge drum has been exceeded
    The power supply was interrupted (cable breakage or misconnected cable)
    The reed-contact is defect
    The magnet has been contaminated (with metal particles).

          Note: The NGX cannot be connected directly to a SPS control. (If the wiring diagram as shown on page 3 of the installation instructions of the BR-NWt W 4651-6.11 is modified, the design approval is void)

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CONTACT

A&E Commercial Service Engineering Co., Ltd

Head Office: 14 Tan Xuan Street, Ward 8, Tan Binh District, Ho Chi Minh City.

Trading Office: 270 – 272 Cong Hoa Street, Ward 13, Tan Binh District, Ho Chi Minh City.

(+84-28)3812 1970

info@aeco.vn

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