An On - Off signal for level control is the most common method of level controlling which is simply to start the feedpump at the low level and let it run until the high water level is reached within the boiler drum.
The SK-T-2400 Level Controller operates on conductivity principle for controlling the level in conductive liquids. The Level Controller with Probes are suitable for use with different qualities of liquids such as water, condensate and boiler water. On-Off Level Control Systems can be used in water with an electrical conductivity as low as 10 μS/cm at 25 ˚C.
With On-Off Level Control System, Level Probes detects the water level of boiler and therefore, the integrated level controller starts or stops the feedwater pump. Besides, two alarm relay outputs can be provided.
There is one fuction for each electrode. Each electrode can be cut to the required length to use on installation. Four different functions could be provided by Level Probe SK-T 2400:
• Pump On -Valve Open
• Pump Off -Valve Close
• 1st Alarm (Low or High)
• 2nd Alarm (Low or High)
By using alarm relays, it is also possible to stop burner.