PH measurement
PH measurement
(OP)
We are looking to replace a ph system that has three sensors ( triple validation ) on the suction side of a self priming pump. We have to replace the sensors due to drying out problems. for various operational reasons it will be difficult to re engineer the pipe work.
Any tips or advise on this application would be appreciated.
Regards
Bill
Any tips or advise on this application would be appreciated.
Regards
Bill





RE: PH measurement
Hope this helps.
saxon
RE: PH measurement
KInd regards
RE: PH measurement
m777182
RE: PH measurement
This link may give a further alternative, I havnt had a chance to read it properly yet so appologies if it is a wild goose chase.
http://www.socsa.org.uk/SONAR.htm
RE: PH measurement
Have a safe and healthy day.
J. Alvarez
RE: PH measurement
this link is to an alternative method using ultrasonic sensors.
Note: suitable for solids/bubbles at <10%volume and I understand surface coating may not be a problem as the coating layer is thought to be insignificant conmpared to the sensor gap (see their other data).
http://www.sensotech.com/sources/65_01.pdf
JMW
www.viscoanalyser.com
Eng-Tips: Pro bono publico, by engineers, for engineers.
Please see FAQ731-376 for tips on how to make the best use of Eng-Tips Fora.
RE: PH measurement
We use a sampling rack for all Ph-meters, it consist of reduce the pressure and cooling the sample until 25°C (cooler/heater), finally ph-meters cell is located which is cleaned and calibrated everyweek, but everyday laboratory people compares the values to assure water quality.
Bye There
RE: PH measurement
Having dealt with that issue, however, you still have to deal with a greater problem: placing pH probes on a pump suction is generally a bad idea.
RE: PH measurement
RE: PH measurement
Examples are TopHit from Endress + Hauser, Durafet II from Honeywell and TupHet from Emerson.
Alternatively an automatic system could be used that retracts the probe into an isolated (and wetted) standby position when the process line is shut down. These are available from Endress + Hauser, Knick, Mettler-Toledo, Emerson, and probably a few others.
RE: PH measurement
= = = = = = = = = = = = = = = = = = = =
Corrosion never sleeps, but it can be managed.
http://www.trenttube.com/Trent/tech_form.htm
RE: PH measurement
http://www.pfaudler.com/gle/instmnt.htm
The probe remains in place during batch operation or shutdown and can be stored dry ...
Regards,
CARF