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Barnstead Nanopure D4751 Meter Calibration Issues

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Barnstead Nanopure D4751 Meter Calibration Issues

Date : 4/10/2014
From : Alan

Question

Hello, I have a question regarding an older Barnstead Nanopure D4751 unit. The resistivity calibration check reading is 11.0 megohm-cm, outside the recommended 9.7-10.3 range. Can this be reset or replaced, and if so should it be? Thanks, Alan

Answer

That would definitely show the meter is out of calibration. The problem is that it is not calibratable. Also since the system have not been made in over 25 years, there are no parts available to fix the reading.

We do have a manual available here :

https://www.apswater.com/article.asp?id=145&title=Manuals+for+Barnstead+Brand+Water+Systems

You do have a few options

You could note the resistivity after a new set of filters and assume that 18.2 megohm. As it starts to drop, then you would know you had to change the filters.

You could retrofit a new meter and cell.

https://www.apswater.com/shopexd.asp?id=6213&Product=752-II+Myron-L+750+II+Analog+Resistivity+Monitor-Controller

You could buy a new system. You would find those here:

https://www.apswater.com/shopdisplayproducts.asp?id=1109&cat=Barnstead+MicroPure+Water+Purification+Systems



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