Question about apex salinity probe

[recess62]

Hi all,

Is is normal to have the salinity value show so much variability. It seems to oscillate in correlation the temperature changes

 

[vic5hands]

Mine does the same thing . Depends on time of day. Lighting ect.

 

[recess62]

Was wondering if I have some EM interference. I have the probes zip tied together with the heater

 

[vic5hands]

 

[Breadman03]

Was wondering if I have some EM interference. I have the probes zip tied together with the heater

I bet that is part of the issue. My PM2 disconnected last night so I don't have much of a graph right now, but here is one that shows when I hooked up my ATO. The dips don't correlate to my heater which is about 18" away. Also, my temp probe wasn't connected to the PM2 at that time, so the salinity isn't temperature compensated.

 

[Reflective]

Hi all,

Is is normal to have the salinity value show so much variability. It seems to oscillate in correlation the temperature changes

Did you hook your temp probe up to the PM2 module and temp calibrate the conductivity probe?

 

[vic5hands]

Look at your Salinity. Aren't you running kind of high. Recommended Salinity is a target of 35

 

[Randy Holmes-Farley Verified Community Expert]

Conductivity does change a lot with temperature, and all devices should be automatically correcting the reading to a 25 deg C equivalent.

Perhaps yours is not presently doing that correctly.

 

[recess62]

Did you hook your temp probe up to the PM2 module and temp calibrate the conductivity probe?

How do I do this??

 

[recess62]

Look at your Salinity. Aren't you running kind of high. Recommended Salinity is a target of 35

Well according to my hydrometer and refractometer the salinity is 1.025. I have calibrated the salinity probe several time but it is reading high. Also of interest is that it does read my ro water at 0. Any thoughts?

 

[jduck]

Make sure tank water is 35 and calibrate probe in tank/sump

 

[recess62]

Make sure tank water is 35 and calibrate probe in tank/sump

Ok I can do this. What do I set the calibration standard too on the apex?

 

[vic5hands]

Your hydrometer is a reference. My hydrometer is ..003 off.

 

[Reflective]

How do I do this??

http://www.neptunesystems.com/downloads/docs/PM2_manual.pdf
In the Probe Setup section there is instructions for temperature compensation.

 

[recess62]

http://www.neptunesystems.com/downloads/docs/PM2_manual.pdf
In the Probe Setup section there is instructions for temperature compensation.

OK I found this. Do I leave the temp probe connected to the pm2 module? If I do does the controller still display the temperature?

Thanks for your help

 

[Reflective]

How do I do this??

If you only have one temp probe, you can just move it from the base module. You just have to fix your APEX Fusion dashboard to start tracking the new probe name. Mine went from TEMP to TMPX4

 

[Reflective]

OK I found this. Do I leave the temp probe connected to the pm2 module? If I do does the controller still display the temperature?

Thanks for your help

Yes, you will have to leave it there.

 

[recess62]

Ok this now makes sense. Thanks a bunch

 

[Breadman03]

If you only have one temp probe, you can just move it from the base module. You just have to fix your APEX Fusion dashboard to start tracking the new probe name. Mine went from TEMP to TMPX4

And remember to change which probe your heaters use

 

[Randy Holmes-Farley Verified Community Expert]

Make sure tank water is 35 and calibrate probe in tank/sump

IMO, it would be better to calibrate with a true 35 ppt standard rather than assuming some other measurement of the tank water is accurate.