Multiple Kansai Thru Passes

I'm a foreigner who will be visiting Japan in July. I understand I can purchase the 2- or 3-day Kansai Thru Pass either before I leave for Japan or I can purchase it once I'm in Japan. Is there a limit to how many 2/3 day passes I'm allowed to purchase? I thought I read somewhere that you can only purchase one JR Pass per trip (I may be mistaken). Just wondering if this is true for the Kansai Thru Pass also?

Thanks!

http://www.surutto.com/conts/ticket/3dayeng/
http://www.westjr.co.jp/english/travel/jrp/index.html
The Kansai Thru Pass you can buy several times, it is for non-JR transport.
The JR-West Rail Pass you can buy one time per trip in Japan.
You can buy as many 7 or 14 or 21 days JR Rail Pass vouchers ( nationwide for all JR trains ) as you like, but only outside Japan