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Source: https://writers.stackexchange.com/a/23522
License name: CC BY-SA 3.0
License URL: https://creativecommons.org/licenses/by-sa/3.0/

Source: https://writers.stackexchange.com/a/23522
License name: CC BY-SA 3.0
License URL: https://creativecommons.org/licenses/by-sa/3.0/

I think you need to join them into a single step, or else there is a risk that the user will do the first step without paying attention to the indicator arm, and may thus hold the input vane open too long.

And I presume that there is a third step here, which is to close the input vane when the indicator arm reaches the set value.

You definitely need to join the first two parts of this, and the appropriate conjunction seems to be "until". You might also join the third with "then":

> Turn on the air pipeline input vane and keep it open until the indicator arm moves to the set value. Then close the input vane.

Or you can put the close instruction on a separate line:

> Turn on the air pipeline input vane and keep it open until the indicator arm moves to the set value. Close the input vane.

Or you can decide that it is implied by "keep open until".

> Turn on the air pipeline input vane and keep it open until the indicator arm moves to the set value.

If it is hard to locate the indicator arm, then it makes sense to tell people to locate it before they open the value.

> Locate the indicator arm by [how] Turn on the air pipeline input vane and keep it open until the indicator arm moves to the set value.

Since this sounds like a procedure that can affect both worker safety and protection of property, make sure you field test your instructions to make sure they result in correct action with your target audience.

Original score: 4