I just set up my new PM2 Everything is working firmware up dated both probes calibrated
now in the temperature compensation is saids select the temperature compensation in %/c, press OK
ok but what value goes in there?
thanks
I just set up my new PM2 Everything is working firmware up dated both probes calibrated
now in the temperature compensation is saids select the temperature compensation in %/c, press OK
ok but what value goes in there?
thanks
From the PM2 manual: Seawater typically has a temperature correction factor of 2.1 to
2.3 %/C
2.2 is a good staring point. You maybe end to adjust it a bit, but start there.
Please do not send me PMs with technical questions or requesting assistance - use the forums for Apex help. PM me ONLY if the matter is of a private or personal nature. Thanks.
that is what I did
why will I change it?
Thanks
If you find that it's over- or under-compensating.
Please do not send me PMs with technical questions or requesting assistance - use the forums for Apex help. PM me ONLY if the matter is of a private or personal nature. Thanks.
ok but how do I know if it is over or under compensating
Test the tanks salinity with a refractometet and see I'd it matches your probes number
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that make sense thanks
Except that the response given doesn't correctly answer your question. Temp compensation, if set properly, will result in little to no variation in the salinity reading in relation to a temp change. If you see the salinity reading changing along with temperature, then the temp comp value is not right and needs to be adjusted up or down accordingly.
Does it need a temp probe connected? I thought it did
Only works with temp probe connected
My next oversea order will include another temp probe, as I rather keep the one I have to the main unit
You can use your temp probe from the controller but you have to move it to the PM2. That's the only way the PM2 will recognize it for temp comp. Remember when you do that the temp probe name will change. Regardless of where the temp probe is connected, you can still use it to control your heater and chiller. So there's really no downside to having it connected to the PM2 instead of controller.
Al
I do not work for Neptune. Please do not send me PMs with technical questions or requesting assistance - use the forums!
For Neptune support send an email (don't call) to: [email protected] .
Manuals for all products including the Comprehensive Reference Manual can be found here.
Well the downside is that the PH can not be linked to temp anymore if I am not mistaken
Doing temp compensation on pH is totally worthless IMO. The difference in pH between say 79 and 81 takes you out 3 decimal places...well beyond the accuracy of these probes.
Al
I do not work for Neptune. Please do not send me PMs with technical questions or requesting assistance - use the forums!
For Neptune support send an email (don't call) to: [email protected] .
Manuals for all products including the Comprehensive Reference Manual can be found here.
So I see my ppt changing slightly with temp. 32.8 to 32.2 so how is the compensation done. In other words do you increase the compensation in a particular direction based on how the ppt changes etc. I understand the chemistry of why ppt changes but how does it relate to the compensation value set in the probe menu?
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Last edited by iamchadster; 02-28-2014 at 22:09.
Chad
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