Technical Bulletin 781101, c.1970s

A leaflet of the Type 'H' and Type 'L' Electronic Level Control Units, with control panel, c.1970s

Technical Bulletin_01
Gloucestershire Archives and John Bancroft copy
Technical Bulletin_02
Gloucestershire Archives and John Bancroft copy
Small control panel for Type 'H' & Type 'L' Electronic Relays
Gloucestershire Archives and John Bancroft copy

These electronic control units were designed to control the level of water in air/water hydraulic accumulator systems.  They were introduced in the 1970s and replaced all former mercury and search-coil type systems.

They were extremely reliable and robust in their construction, mostly employing solid-state components of the highest military-grade quality.

The inbuilt fail-safe characteristics of these control units offered significant improvements in the overall safety of accumulator control systems at a time when the new Health and Safety at Work Act (1974) was beginning to gain strength.

The units were designed by Peter Salter, formerly a Colonel in the army, who worked as a design engineer in the Electrical Department. He also developed the early closed-loop speed-control systems used on numerous copper and aluminium extrusion presses.

Click on the hyperlinks here and here to view examples of accumulator control systems employing these electronic control units.

Click on a photograph to enlarge an image.

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