Water level alarm
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A British patent has been granted to Thomas Electronics Ltd. for Radolarm, a device for indicating the loss of water from the cooling system of commercial vehicles. A further model for sealed radiator systems in vans and cars has also been introduced.
The device acts in accordance with the coolant level and gives immediate warning when it reaches a pre-determined danger level, which cannot be detected by a temperature sensitive device.
The first model, Rad/1, works on a completely isolated electrical system and has a flashing light unit on the dashboard. The transistorized electronic unit, which is mounted on a six-point plug and potted in vibration-resistant compound, is fitted in the cab, along with a warning buzzer. The electrode is fitted to the cooling system.
With a sealed cooling system, regular checks on the water level are unnecessary so the problems of hose leakage may be amplified. For smaller vehicles the circuits are modified to work without a buzzer on a 12V supply, but with a continuous warning light similar to ignition warning systems. Known as Rad/2, this unit is situated behind the dashboard.
Made by: Thomas Electronics Ltd., Electronic Centre. Deansgate Lane, Timperley, Cheshire.