Do you feel your PO4 readings are high, low, or just inaccurate?
My HI713 always gave higher readings but consistent so I never really questioned. Finally checked against another kit and it was reading way high. Tried my next box of reagent and everything tested at 0.00ppm. Even tap water and rejected water from RODI.
I went back to Hanna support with a couple questions and this was their response. Not designed for salt water and non-repairable.
"Hello,
The HI 713 is not designed to test salt water but fresh water.
I’m not sure what kind of readings should be expected with RO/DI water, but if the readings are constantly high even with fresh water, you might look at cuvet condition or dirt in the optical cell that could be interfering.
It would be also possible to test the instrument with HI 713-11 which is a CalCheck standard kit used to test the accuracy of the instrument. Have you tried another lot of reagents to see if it would make a difference?
As the warranty on these Checkers is 6 months, this meter could not be covered under warranty, and in the case it would really be faulty, such instruments are not repairable and simply needs to be replaced.
Regards
François Coulombe
Spécialiste au support technique / Technical support specialist
Hanna Instruments Canada Inc.
1-800-842-6629"
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