Which of the following statements is INCORRECT about the high - pressure and low - water safety alarm in a steam boiler ?
1
The high - pressure and low - water safety alarm is a safety mounting against high pressure and low water levels.
2
The high - pressure and low - water safety alarm is suitable for a locomotive boiler.
3
The high - pressure and low - water safety alarm operates with loud noise.
4
The high - pressure and low - water safety alarm has two valves.