Conductivity reading?

[WY_REEFER]

I have a new foxboro conductivity transmitter. I have calibrated it at 10.5 mS and 50 mS. It calibrated perfectley and reads what it should when you put the probe in the CAL fluid.

When the probe is reading aquarium water I get 83 mS. I dont think there is any way it could be that high. I get 1.024 with a refractometer. It also reads zero in DI water and I believe that.

Is there a chance the cal fluid from marine depot could be wrong?
Thanks.

 

[WY_REEFER]

Just seen your Homemade Calibration Standard article, it was very helpful I will make a calibration standard tonight.
Thanks.

 

[Randy Holmes-Farley]

I agree that something is way off. The DIY fluid will easily be able to suggest which is off (the sg= 1.024 or the 83 mS/cm).

Check also to be sure there isn't electrical interference from lights and such when near the tank.

 

[WY_REEFER]

Thanks for the advice.

 

[Randy Holmes-Farley]

:thumbsup:

Good luck.