Calibrate Pinpoint pH Controller

[dave168]

I bought a used pinpoint pH controller, try to calibrate it. (previous owner cant find the instruction) Any one konw how to calibrate pinpoint pH Controller? I got my calibrate sloution 7 and 10. and I am having a hard time to set them right. The controller is about one yr. old and the probe is about 3 months old.
Thanks
David

 

[JenDub]

http://www.americanmarineusa.com/phcontroller.html

Here's the manual =)

 

[dave168]

Thank you very much. I am able to get the 7 down. When I adjust the slope for the 10, highest i got is 9.72. I try two different times (calib. soultion package) What did I do wrong? or I bought a junk?

 

[glaudds]

I would suspect the probe, even if it's three months old. Did it dry out in the sale?

 

[NicoleC]

Keep switching back and forth from solution to solution, readjusting each time, until you get it calibrated. The longer this takes, the worse condition the probe is in.

 

[JenDub]

make sure to dip in di water between packets

Also-once you adjust to 7 and turn the slope up as far as it will go- rinse and recheck the 7-it will need to be readjusted - then back to ten and so on-it usually takes 4-5 cycles to get it dead on.

Also-be sure to keep the probe wet at all times!!!

 

[dave168]

Thank you everyone for your help. The trick is like JenDub said "adjust to 7 and turn the slope up as far as it will go"
I did that, now is all good.
Thank you for your help. Hope everyone have a happy and safe 4th.

 

[dave168]

Hello, It is me again, here is what bother me,I just calib my pinpoint pH controller. 7 and 10 but when I put my probe in the tank (not sump or should I put it in the sump?). It reads 7.66.
I use quick dip test kit, it says 8.4.
I then use the ph high range (7.4-8.6) test byNutrafin, it reads 8.6.
Can anyone tell me what I should do?
this is a 75g fish with live rock and some corals (7/5/06)
temp-77
Mg-1320
CA-214
KH-15
NO3-0
NO2-0

Test the water again 7/6/06
pH 7.66
temp 77.
temp-77
Mg-1300
CA-212
KH-15
NO3-0
NO2-0
I test in the sump, tank, and in a cup. Not much of difference.

Thank you
David

 

[dave168]

Another theory I am thinking is it might be the probe? according to the saler it was only 3 months old. ( maybe this is why he sold it) is there anyway to check out the probe. or could it be the controller?

 

[pookstreet]

Call American Marine and see what they can do for you. I bought a used PinPoint pH monitor from the sales forum and then bought a new probe from Premium Aquatics but it just wouldn't calibrate. I called them and they said to ship it in and they'll take a look. They ended up replacing some circuit item that was fried even though it was not under warranty. I only had to pay for Priority Mail shipping to them. Great service IMO. HTH.