ATMI manufactures float level switches for narrow access tanks, which are ideal for companies that require a device that can be used in hard to reach areas.
The Tuba 1" float level detector is suitable for use with liquids in tanks, cisterns and reservoirs. It can also provide automatic pump regulation and alarm level detection. Those float level switches for narrow access tanks, have got a maximum temperature threshold of 85ºC & comes with varying cable lengths. They have silver/nickel contacts and the float weighs just 60 grams (without the cable).
There is also a one and one-quarter inch version of the switch, which is shorter and wider than the one-inch product.
For more information about the float level switches for narrow access tanks download the following datasheet: