Praxis shows that many BOSMA Liquid Level Controllers installed in +/- 25 years up to 2013 are still functioning but clearly need revision or replacement. Among other problems it sometimes occurs for example that the old fashioned needle indicator on the frontplate “hangs”. When customers request a replacement, in many cases the old models are specified because of reading the old tagplate or frontplate. Our answer to this is that our new Liquid Level Controller Model LLC-D3 is the perfect replacement for all old Bosma Liquid Level Controllers.

Old Models:

NCA, with 1 to 3 relais-outputs and optional mA-output produced until the 1980’s
LLC-221, LLC-222, LLC-223 with respectively 1 to 3 relais outputs, produced until 2013
The extension “-4” stands for a 4-20mA output. This mA-output was load dependent and so had to be adjusted for a load 100Ω, 250Ω or 400Ω.

As an example Model LLC-223-4/700/NH3-250Ω stands for a unit with 3 relais + the optional mA-output adjusted for 250Ω . This controller only works properly together with a 700mm NH3 measuring probe.


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