"let us remind" is correct and usable in written English.
You can use it when you want to bring something back to someone's attention or to tell people to remember something. For example: Let us remind everyone that the meeting starts at 5 pm sharp.
Let us remind that we use the grid (S) step 0.25 nT for calculating hourly baseline values (see "Validation of the method on synthetic data" section), whereas INTERMAGNET requires daily values.
Let us remind ourselves what David Cameron said about people using Twitter.
Let us remind some basic facts about growth rates that will be used in the paper.
Let us remind that in our study the CW situation corresponds to the use of many detectors to resolve spatially a steady-state signal, while the ITD case corresponds to a time-resolved detection on a single extended detector.
And – let us remind ourselves – boxing is a sport.
"And let us remind ourselves why she is so well qualified.
Let us remind ourselves that Syria is suffering, most pressingly, a vast humanitarian problem.
Let us also remind that used surrogates have quite sound background: a) Latitudinal distribution proved to have very strong effect on sexuals, which is consistent with hypothesis of founder-flush events (see Results/Discussion, part 3.1, predictor 4).
Reminding Ourselves of Progress At the onset of this key event let us first remind ourselves of the progress that developing countries have made towards achieving Millennium Development Goals on education and gender (MDG 2 and 3).
Let us not remind New York what all the avid and demanding among us take for granted, that a volume of three novellas is more intriguing than one flabby novel.
Let us please remind ourselves: these are tools, not solutions.
