Dear :

I understand you have the latest system installed in your plant at [location]. We are considering installing a system like that in our own plant and would like to have a look at yours before making our selection.

I will be in [area] from to [date]. Would it be possible to visit your company then? I can arrange to come at any hour convenient for you. Even a short visit to your plant would be helpful, and greatly appreciated.

Hope to hear from you soon.

Sincerely yours,

[name]

[title]