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Series 1001/1001A/1001XL Pneumatic Liquid Level Controller

Reliable, versatile and economical pneumatic liquid level controllers with no-bleed, forced-balanced operation. Available with patented Envirosave snap pilot to prevent fugitive emissions and reduce bleeding of valuable gases.


Series 1001
Economical level controller with a non-weatherproof case/cover

Series 1001A
Features a a weather-resistant sealed case and a manifold-style pilot assembly

Series 1001 XL
Designed with a back-mount connection

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Series 1001/1001A/1001XL Pneumatic Liquid Level Controller


  • No-bleed pilots
  • Snap (On/Off) or throttle (proportional) control
  • Right- or left-hand mount
  • Field-configurable direct or reverse action
  • Removable door
  • Various arm lengths, displacer sizes, diameters, connections and body materials
  • Options include SPDT or DPDT electric switches
  • Weather-resistant sealed case (1001A & 1001XL)
  • Built-in filter


Body Materials

  • Throttle: Aluminum w/Aluminum Seat
  • Snap: Aluminum w/Aluminum Seat
  • Envirosave: Aluminum w/Elastomeric Seat
  • Gasket/diaphragm: Nitrile
  • Internal Valving: 302 SST
  • Filter Element: 40 Micron SST
  • Screws & Nuts: SST

Electric On/Off Switch

  • Micro-Switch Enclosure: Cast aluminum
  • Junction Box: Cast aluminum

Temperatures (Body)

  • 1001/1001A:
    ASTM A696/A105 (std)
    -20 to+600°F (-29 to+316C°)
    ASTM A351 CF8M/A182
    -70 to+600°F (-57 to+316C°)
  • 1001XL
    ASTM A216 WCC/A105 (std)
    -20 to+600°F (-29 to+316C°)
    ASTM A351 CF8M/A182
    -70 to+600°F (-57 to+316C°)

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