Called Hanna Instruments today about the pump melting. They were polite and friendly, but didn't totally set my mind at ease. They were willing to send me a new pump, but I explained that it appeared the fittings were the problem, not the pump itself. They took a look at the picture in the previous post and are sending me a new pump head with the fittings. I'll give it a shot.
However, these fittings are the only ones they have, and if the new ones start to melt, there is no other option available from them. I'll get the new ones, install them, and see what happens. It's not a comfortable feeling knowing that I could be looking at another failure in a couple of months.
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