This Multi-channel single zoned Controller utilizes a multiplexer that is great for car parks and jobs where you only need to read a room value and are utilizing multiple sensors all of the same gas type. The number of sensors attached to this controller can be increased to 15. For your car park needs this controller has the functionality to control your ventilation fans by either Relay’s or ramping according to gas concentration. We also have our 660 version which enables you to control 3 extra fans giving you a total of 6. Although this controller looks basic it is packed with lots of features to assist in your daily operations.