Help needed: pneumatic signal lines and IA instrument air
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I would like to ask the fellow sailors in the instrument panel area: 1. For the pneumatic signal lines shown in the diagram, are they actually electrical signals, or is signal transmission achieved through gas? 2. What does a box in the diagram with a horizontal line added and then IA mean? 3. What does the box +P connected to by the start signal line in the diagram mean? I’m really asking for help from all the sea friends here; I just don’t understand this
IA instrument air is supplied to the pneumatic actuators of valves (pneumatic; P likely refers to this). In general, the pneumatic actuators of on/off valves are equipped with solenoid valves to control the inflow and outflow of air, thereby regulating the operation of the actuators – that is, control is achieved through electrical signals
1. For the pneumatic signal lines shown in the diagram, are they actually electrical signals, or is signal transmission achieved through gas? Answer: Pneumatic signal lines certainly use gas to transmit signals. 2. What does a box in the diagram with a horizontal line added and then IA mean? IA stands for Instrument Air; that is, Instrument Air 3. What does the box marked +P, to which the start signal line is connected in the diagram, mean? P should represent a positioner, which is an abbreviation for Positioner.