Milwaukee SMS122 pH Controller questions

fsn77 · 12/03/2009, 09:38 AM

I picked up a used Milwaukee SMS122 pH controller a little while back and just stored it knowing I'd need it in the near future. I pulled it out last night and was looking at the manual online to get the details about calibrating it. I get to the part where it says to adjust the slope while the probe is the pH 4 standard by turning the screw in the center on the back of the unit, only to flip over the unit I have and not see a screw, only a very small hole. Not having used this particular brand before, I'm looking to verify if the screw on the back is visible (and to see if the unit I have is now missing this screw), or is it just recessed that far into the case that I cannot see it?

Also... Is the battery cover suppose to be incredibly difficult to remove? I have the AC adapter, so this isn't a real issue, it just seems odd that I couldn't get the cover off. I tried several different times to slide it off, but it doesn't budge at all.

Haksar · 12/03/2009, 09:52 AM

You can use adaptor instead of battery,never used it.I use the screw in front to adjust the ph while calibrating.But now that I am having ph fluctuations(may be the probe is faulty) I need to check if the back screw if its there is also used for calibrating.

NCNBilly · 12/03/2009, 10:15 AM

Been awhile since I checked mine, but yes - the rear screw is tiny and recessed pretty far.

Roy Arena · 12/03/2009, 10:32 AM

Yes there is a small hole in the back to adjust. If the unit has not been used for a while maybe pick up a new probe and some calibration packets and you'll be good to go.

Haksar · 12/03/2009, 12:14 PM

So while calibrating should we use both the screws back and front.Like say back screw for ph 7 and front screw for ph 9.

fsn77 · 12/03/2009, 02:43 PM

Thanks for the help! I'll need to find a smaller screwdriver to fit in that hole.

I'll definitely pick up a new probe and some fresh calibration solutions. The last thing I want to do is complicate setting up my new calcium reactor by using a faulty probe.

Based on the manual, yes, calibration does use both screws, although I've yet to actually do it myself with this particular controller.

From the manual:

Quote:

CALIBRATION PROCEDURE:
• Remove the protective cap from the electrode.

• Immerse the electrode tip into a new sachet of pH 7 calibration solution and allow the reading to stabilize.

• Adjust the OFFSET calibration trimmer (on the front) to display "7.0 pH".

• Open a new sachet of pH 4 calibration solution and use a small quantity to rinse the electrode.

• Immerse the electrode tip into the pH 4 sachet and allow the reading to stabilize.

• Adjust the SLOPE calibration trimmer (on the rear) to display "4.0 pH".

• The calibration is now complete and the meter is ready to take measurements.

• It is suggested to recalibrate the meter at least once a month, after a prolonged stocking time and after pH-electrode replacement.

12/03/2009, 09:38 AM	#1
fsn77 Registered Member Join Date: Mar 2006 Location: SC Posts: 777	Milwaukee SMS122 pH Controller questions I picked up a used Milwaukee SMS122 pH controller a little while back and just stored it knowing I'd need it in the near future. I pulled it out last night and was looking at the manual online to get the details about calibrating it. I get to the part where it says to adjust the slope while the probe is the pH 4 standard by turning the screw in the center on the back of the unit, only to flip over the unit I have and not see a screw, only a very small hole. Not having used this particular brand before, I'm looking to verify if the screw on the back is visible (and to see if the unit I have is now missing this screw), or is it just recessed that far into the case that I cannot see it? Also... Is the battery cover suppose to be incredibly difficult to remove? I have the AC adapter, so this isn't a real issue, it just seems odd that I couldn't get the cover off. I tried several different times to slide it off, but it doesn't budge at all.

12/03/2009, 09:52 AM	#2
Haksar Registered Member Join Date: Sep 2007 Location: Dubai Posts: 1,041	You can use adaptor instead of battery,never used it.I use the screw in front to adjust the ph while calibrating.But now that I am having ph fluctuations(may be the probe is faulty) I need to check if the back screw if its there is also used for calibrating. __________________ Haksar

12/03/2009, 12:14 PM	#5
Haksar Registered Member Join Date: Sep 2007 Location: Dubai Posts: 1,041	So while calibrating should we use both the screws back and front.Like say back screw for ph 7 and front screw for ph 9. __________________ Haksar

12/03/2009, 10:15 AM	#3
NCNBilly Black thumb reefer Join Date: Jan 2004 Location: Harrisburg, PA Posts: 1,043	Been awhile since I checked mine, but yes - the rear screw is tiny and recessed pretty far.

12/03/2009, 10:32 AM	#4
Roy Arena Registered Member Join Date: Aug 2003 Location: Chandler AZ. Posts: 202	Yes there is a small hole in the back to adjust. If the unit has not been used for a while maybe pick up a new probe and some calibration packets and you'll be good to go.