The Intelligas 100 S and 100 CS are the simplest, most economical systems that we offer. They meet the requirements of BS 6173 and are easy to install – even if you’re not the most technical of installers, our clear instructions and 24 hour help line will guide you through to completion. The 100 S system has been designed for use with air differential pressure switches. The 100 CS system has 2 on board current sensors as an alternative interlock method to air differential pressure switches. The 100 CS system is a perfect unit to have on a service van. It can replace units that are using current sensors but also has terminals to connect air differential pressure switches.