I have this sentence where I am not sure about two things:

  1. "after launch" – is that correct when I talk about a device?

  2. "since then" – is that correct with the past simple tense?

I'm sorry for the lack of the context. The values are provided to an upstream system, hence I used "provided". It is a device for measuring of the water pH - so I thought a device can be "launched". When you start it, it provides the upstream system with the first (or initial) value in 100-200 ms. After that, it continuously provides updates.

The first value is obtained 100-200 ms after launch and is continuously provided in the defined interval since then.

  • The example sentence is totally ungrammatical/non-idiomatic in so many ways I think this is really just proofreading by another name. – FumbleFingers Reinstate Monica Aug 6 '14 at 13:30
  • @FumbleFingers: what are the issues then? What is the purpose of this site if mistakes are not corrected and questions downvoted instead? ... – John V Aug 6 '14 at 13:34
  • @user970696: There are several "issues" (apart from the simple fist/first typo). ELL is not a proofreading service, and the OP has given so little context that I'm inclined to think even the use of words like launch and provided here is probably inappropriate. My point is the "sentence" is so bad it would be grossly misleading to simply replace the (definitely) inappropriate since then with something like thereafter. Just doing that wouldn't salvage the text. – FumbleFingers Reinstate Monica Aug 6 '14 at 14:14
  • @FumbleFingers: Would that be better? "The initial value is obtained in 100-200 ms after the start and is continuously updated in defined interval thereafter. – John V Aug 6 '14 at 14:21
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    @user970696: The first in there should be deleted. There's probably no elegant way to include a short and clause in exactly this context for the exact meaning I assume (now, after an edit) OP wants to convey. The mopst natural/common phrasing would probably be ...and is continuously updated at defined intervals thereafter, but that kinda fudges the issue as to whether it's always the same "defined interval" thereafter. Logically, it's almost bound to be the same, but one could speculate the instrument might thereafter update at, say, constantly doubling intervals. – FumbleFingers Reinstate Monica Aug 6 '14 at 14:36

Unless this is a technical term I don't know about, launch is used for the moment when a product goes on the market and is effectively launched by the manufacturer. Otherwise spacecraft are launched into space. Hard to tell without knowing what kind of device.

since then in that sentence is awkward as hell, if not downright incorrect.

I would use thereafter or from thereon in or from that point forward (in order of personal preference).

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  • Hmm, computer games often have that button in the installer -- "Launch".. As for the "since then"..does not sound incorrect to me but I am not a native speaker :) – John V Aug 6 '14 at 13:24
  • (1) Thank you, that may be the "technical term" I was talking about; (2) Bingo! – CocoPop Aug 6 '14 at 13:54
  • I would rather use "after the start" - IMHO that is clear enough. What other problems are there with the sentence as FumbleFingers mentioned in his comments to the OP's question? – John V Aug 6 '14 at 14:08
  • "After the start" is almost as bad as "since then." The sentence is dismal - I only addressed "after the launch" and "since then" because that's what the OP questioned specifically. – CocoPop Aug 6 '14 at 14:18
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    "The first value is obtained within 100-200 ms of the launch, and is updated at regular intervals from that point forward." to give one possibility. – CocoPop Aug 6 '14 at 14:22

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