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Automatic change-over unit (three independant supply sources)

Automatic change-over unit (three independant supply sources)

SWISS optio change-over unit

The change-over unit at a glance:

  • for an uninterrupted gas supply from liquid gas tank and single cylinders or cylinder racks
  • reduces the pressure of the various gas sources to the required pipeline pressure
  • the electronic control monitors the gas pressure and, if necessary, switches between the gas sources
  • forwarding of the alarm to secondary warning device by potential-free contacts or bus system
  • feed for manually connectable emergency supply
  • very easy to service due to the in-built shut-off and non-return valves

The change-over unit ensures the continuous supply of the gas network with medical gases from three independent sources of supply, i.e. from liquid gas tank and on both sides from individual cylinders, cylinder racks or batteries. The change-over unit which operates with an electronic control, regulates the supply of the gas supply system and reduces the pressure of the liquid gas tank and of the individual cylinders and/or cylinder batteries to the required network pressure. The change-over unit has a safety valve and an inlet for an emergency supply. Upon request, the change-over unit is also available with only two supply sources (i.e. without liquid gas tank infeed).

The pneumatic part and the electronic control of the change-over unit are mounted in a lockable switch cabinet. The operating conditions and the prevalent pressures are shown on the display of the closed cabinet. The messages of the operating status can be forwarded via potential-free contacts to a control centre.

The pressure is regulated in two stages. The two low-pressure regulators are connected in parallel, i.e. one acts as a reserve. When the pressure of the liquid gas tank is higher than 10 bar, the version of the changeover unit with additional tank pressure regulator must be chosen.

The change-over unit is certified according EN ISO 7396-1. The integrated pressure regulators are certified according EN ISO 10524-2 (low pressure regulators only ignition test). CE marking according to Guideline for Medical Products 93/42/EEC

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SWISS optio change-over unit

Technical data:

  • Classification

    equipment class according to CE Guideline 93/42 EEC annex IX, class II b

  • UMDNS-Code

    18-046 (change-over unit) / 15-824 (alarm system)

  • Inlet pressure

    200 bar

  • Outlet pressure

    1st stage max. 10 bar, pipeline pressure 4-5 bar (option 7-10 bar for AIR and N2)

  • Flow

    60 Nm3/h / 100 Nm3/h (PInlet = 21 bar, PMedium = 10 bar, PPipeline = 5 bar, AIR)

  • Gas

    AIR, O2, CO2, N2O, N2

  • Supply voltage

    230 V 50 Hz AC (integrated power supply) / internal voltage : 24 V AC

  • Electronic outlets

    potential-free contacts (one contact per gas source), for secondary warning device

    bus system CMS K-DATA with Interface for RS 232 (optional)

  • Inlet

    liquid gas tank : soldering fitting inner- Ø22 mm, cylinder connection : G 3/4“,

    emergency supply feeding : soldering fitting inner-Ø22 mm

  • Outlet

    soldering fitting inner-Ø22 mm

  • Material

    brass, copper, stainless steel, aluminium, cabinet : sheet steel powder coated

    RAL 7035

  • Sealing material

    POM, EPM, NBR, PA 6, CR, PPS, PEI, PTFE, copper

  • Operating temperature

    + 10° to + 40ºC

  • Dimensions

    W x H x D: 700 x 930 x 225 mm

  • Weight

    66 kg

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