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This vessel is one that performs the role of the liquid/vapor separation and storage of liquids. The dotted lines in Fig. 10.13 to look at five different levels of liquid interest. At the controller level, whether it is the capacitance sensor level, as shown in Fig. 10.13, or float switch, regulates the solenoid valve in the liquid line. If the level in the tank falls below the point of control, solenoid valve on the liquid line power opens. When the liquid level reaches the setpoint, the solenoid valve is closed. Volumes above and below this a controlled level of accommodation surge volume and volume of ballast. Splash volume serves for placing of liquid, which can be replaced by the evaporators during defrost. Another source of liquid splash in some of the plants from the liquid/vapor line when smashed down to the low-pressure receiver. If the electrical capacity of the plant will be interrupted, the liquid continues to consume liquid/vapor lines.

Controlled level lowest level of control because some of the fluid must be available between the controlled level and to operate with a low level signal.
Reason for the need for this volume of ballast is that when you start or resume one or more evaporators, the pump can reach the refrigerant from the vessel to a greater extent than arrives at that moment, a combination of supply and controlled fluid from the return of the liquid/vapor lines. If the ship containers of low level alarm condition, the operation continues, but the operator or system security informed. The further decline to the level of low level cutout is reached, which is usually set to stop the pump.

There are two control levels higher than the managed level: high signal level and high-level switch. Signal simply notify the operator or security, to invoke the on-site investigation. If the fluid level reaches the high-level tools, compressors stopped for their protection.

Several electric current values can be thwarted 420 mA capacitive level sensor, which correspond to a controlled level of high anxiety level and low level alarms. To ensure independent backup, the ultimate safety provisions, high level and low level cutouts are controlled by separate float switches...

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