How do you Calibrate In-line TDS Meter

[griss]

Still solution with t-fitting submerged or recirculating system.

If recirculating system, how do you have that set up?

 

[cal_stir]

The sensor will pull out of the T, it's a john guest fitting.
It is important to put the sensor back in the T with the electrodes perpendicular to the water flow

 

[griss]

The sensor will pull out of the T, it's a john guest fitting.
It is important to put the sensor back in the T with the electrodes perpendicular to the water flow

Yes, I know that and that’s how I’ve always done it. But, HM Digital’s instructions specifically state NOT to remove the sensor from the T. I’m curious why they state that?

I was also just curious how others do their calibration.

 

[kharmaguru]

I've never calibrated a TDS meter. In my mind no conductivity = zero TDS. If I was growing hydroponics and I wanted to know the nurtient levels were correct then calibration would become important because now I want an accurate value that is not zero TDS.

 

[cal_stir]

I take the sensor out and place it in solution

 

[griss]

I've never calibrated a TDS meter. In my mind no conductivity = zero TDS. If I was growing hydroponics and I wanted to know the nurtient levels were correct then calibration would become important because now I want an accurate value that is not zero TDS.

I have a dual meter and I like to calibrate to make sure my RO membrane is still good. Agree on no conductivity = 0 TDS. If I were just measuring after the DI, I probably wouldn’t worry about calibrating either.

 

[kharmaguru]

I have a dual meter and I like to calibrate to make sure my RO membrane is still good. Agree on no conductivity = 0 TDS. If I were just measuring after the DI, I probably wouldn’t worry about calibrating either.

I have the same. I still don't calibrate lol. I do make sure the contacts are clean maybe once a year...

 

[griss]

The sensor will pull out of the T, it's a john guest fitting.
It is important to put the sensor back in the T with the electrodes perpendicular to the water flow

Finally got around to calibrating yesterday and, with my old meter, I was able to pull the probes out of the T. This one they are glued into the John Guest???? Weird. Anyway, my meter was actually reading slightly high. So, my product water is actually better than I thought.