Image credit: Flir Commercial Systems | Kobold | ABB Measurement   A pH instrument is an electronic device used to measure the pH of a typically-liquid substance.   Basics of pH Measurement   pH is a measure of the acidity or alkalinity of a substance. While the exact abbreviation is disputed, pH is usually taken to stand for "power" or "potential" of hydrogen. Specifically, pH instruments measure the...
Learn More about pH Instruments


Q & A on pH Instruments

We asked our users for their input on pH Instruments. Here are the results of 57 users familiar with pH Instruments.

Who Took Our Poll? | Design Trends | Applications and Use | Features | Buying Advice

Who Took Our Poll?Top

Design TrendsTop

Q:
What new technologies are influencing pH instrument design?
8 answers
Answers:
1. Standard for Laboratory & field usage (incl. general purpose, and economical cost, with combination type for electrode structure and Epoxy body material, with BNC connector)
~Sodikin Sodikin Susaat, Faculty/Staff, Malang, East Jawa, Indonesia
The use of spectrophotometric dyes for accurate measurements of pH to study ocean acidification. In situ measurements for monitoring oceanic pH.
~Research & Development, Saint Petersburg, FL
None despite many trials. Technology currently in use is at least 8 years old.
~Greg De Nys, Facilities Manager, Townsville, Australia
Can the probe be re-vitalised?
~Alan F, Marketing/Sales, Middlesbrough, UK
Uncalibrated electrodes
~Tarek C, Purchaser, Beirut, Lebanon
Electrode structure
~Purchasing, Ankara, Turkey
Disposable sensors
~Azamat T, Process Engineer, Karshi city, Uzbekistan
ISFED
~Faculty/Staff, Lodz, Poland

Q:
From your perspective, which companies are creating the most innovative pH instruments?
8 answers
Answers:
1. Autonics, South Korea 2. Siemens, Germany 3. Lutron, Japan 4. General Electric, USA
~Sodikin Sodikin Susaat, Faculty/Staff, Malang, East Jawa, Indonesia
Endress-hauser, Emerson (Rosemount), Siemens, Nalco, Hach, Metler toledo
~Azamat T, Process Engineer, Karshi city, Uzbekistan
Mettler toledo
~Tarek C, Purchaser, Beirut, Lebanon
GF Signet
~Process Engineer, Charlton, MA
Rosemount
~Engineering, Design, Kaohuiung County, Taiwan
Yokogowa
~Greg De Nys, Facilities Manager, Townsville, Australia
Consort
~Purchasing, Ankara, Turkey
Hach
~Faculty/Staff, Lodz, Poland

Applications and UseTop

Q:
What are some of the applications you have used pH instruments for?
14 answers
Answers:
For all electronic equipment controllers i.e: 1. Humidity controller for agriculture plants in hidrophonic equipment system 2. Humidity and Temperature controller in wood dryer machine system 3. Humidity and Cooling controller in refrigerators or chiller system and fish hatcheries 4. Humidity sensor for food processing system
~Sodikin Sodikin Susaat, Faculty/Staff, Malang, East Jawa, Indonesia
I am greatly interested in continuous pH monitoring in industrial fluoride based systems. Glass bottom pH resistant electrodes similar to what can be purchased at Cole Parmer or others have a short life.
~General Corporate Mgmt, Rock Island, WA
PH of "black liquor" in wood digestors. pH in self cleaning & buffering applications for cyanide. pH at temperatures above 100oC. pH with the glass electrode vertical..looking up!
~Alan F, Marketing/Sales, Middlesbrough, UK
Here at my current work site, we use pH instruments for measurement and control of lime addition into our flotation circuits for metal recovery.
~Engineering, Process/Production, Tabubil, Papua New Guinea
Control and treatment of hazardous waste. Dosing pump process control to maintain pH.
~Process Engineer, Charlton, MA
I haven't used them myself. My customers use them mainly for water analysis.
~GlobalSpec Registered User
PH of sludges Pharmaceuticals Buffers Mobile phase preparation.... etc
~Pilar, Quality Control, Southampton, UK
Water treatment, mineralization, Soft drinks, and Dairy industry
~Engineering, Consulting, Baghdad, Iraq
On line continue monitor for process cooling water.
~Engineering, Design, Kaohuiung County, Taiwan
Empirical thermodynamic studies. Measure ocean pH.
~Research & Development, Saint Petersburg, FL
Research, industrial monitoring, medical labs
~Purchasing, Ankara, Turkey
Zinc refinery leaching reactors
~Greg De Nys, Facilities Manager, Townsville, Australia
Scientific research
~Faculty/Staff, Lodz, Poland
Milk testing
~Tarek C, Purchaser, Beirut, Lebanon

Q:
Please share with us any “non-standard” applications that pH instruments have been used for.
3 answers
Answers:
Electrode dry-out in partial filled pipe. Recovery of electrode from contaminate liquid junction. Steam cleaning of grease & wax from electrode.
~Alan F, Marketing/Sales, Middlesbrough, UK
Sludges with a ~20% solids
~Pilar, Quality Control, Southampton, UK
What are "standard" applications?
~Greg De Nys, Facilities Manager, Townsville, Australia

Q:
Do you know of any disastrous mistakes that occurred due to the incorrect usage of pH instruments?
5 answers
Answers:
Assumed that because the meter has temperature display the electrode already has a temperature probe incorporated. The readings taken were erroneous because the change of temperature were more than 10*C.
~Pilar, Quality Control, Southampton, UK
Yes, flow control was not there for measure pH of tank water with high temperature and pressure. After that all sensors and accessories had been damaged.
~Azamat T, Process Engineer, Karshi city, Uzbekistan
Not at my workplace. A good response plan and chem training are key to preventing disasters.
~Process Engineer, Charlton, MA
Operators watching a straight line recording of pH without field checking actual readings.
~Alan F, Marketing/Sales, Middlesbrough, UK
Frequent probe failure resulting in high maintenance cost and a process out of control.
~Greg De Nys, Facilities Manager, Townsville, Australia

FeaturesTop

Q:
What would your design or feature "wish list" be for this product?
7 answers
Answers:
Long life resistance to abrasion, scale buildup, high temperature (90degC), low pH (<2), repeatable, accurate, low maintenance, and importantly, cost effective.
~Greg De Nys, Facilities Manager, Townsville, Australia
Compensation pH reading for temperature Chemical resistance of the sensor Reading accuracy at broad pH range Immersion depth below 4 mm
~Faculty/Staff, Lodz, Poland
High measuring range, for example some sensors are having limitation for water conductivity and so on.
~Azamat T, Process Engineer, Karshi city, Uzbekistan
1. precision 2. validity 3. reliability 4. calibration 5. and marketable
~Sodikin Sodikin Susaat, Faculty/Staff, Malang, East Jawa, Indonesia
Truly HF resistant electrode. No requirement to be continuously wet.
~Process Engineer, Charlton, MA
Not yet, still we wait for feedback from our customers.
~Purchasing, Ankara, Turkey
More rough design for beginners.
~Pilar, Quality Control, Southampton, UK

Q:
Is there any advice you want to share with users to help them avoid common errors in selection or usage of pH instruments?
5 answers
Answers:
They must pay attention at temperature, pressure and flow of sample. It shouldn't increase or decrease as designed. And they have to use new buffer solution for calibration. And for storage of sensor they must store as procedure manufacturers.
~Azamat T, Process Engineer, Karshi city, Uzbekistan
Most HF resistant claims are only for a 2% solution, and even then the life of the electrode is short relative to a std electrode. Do not trust your probes in HF, always backup with paper strips, the danger is too great.
~Process Engineer, Charlton, MA
Consider it important to follow the instrument use and care, same people do not read the manuals well enough, or are using very old or contaminated buffers.
~Pilar, Quality Control, Southampton, UK
Not applying the scientific method in the trial process.
~Greg De Nys, Facilities Manager, Townsville, Australia
Select instruments that follow the NERST equaqtion.
~Alan F, Marketing/Sales, Middlesbrough, UK

Buying AdviceTop

Q:
Do you have any advice for people relative to buying or using pH instruments?
7 answers
Answers:
Shop around. Do rigorous trials. Determine most cost effective, long term solution for the application.
~Greg De Nys, Facilities Manager, Townsville, Australia
Always use passive methods like paper strips to verify your pH measures are what you think they are.
~Process Engineer, Charlton, MA
They must pay attention ordering information of this instrument. All information will be there.
~Azamat T, Process Engineer, Karshi city, Uzbekistan
Never buy a transmitter that limits you to original supplier's electrode only.
~Alan F, Marketing/Sales, Middlesbrough, UK
That depending on temperature, it's best to calibrate before use.
~Pilar, Quality Control, Southampton, UK
No advices except reading e.g. www.phmeters.com site
~Faculty/Staff, Lodz, Poland
No, I don't have
~Sodikin Sodikin Susaat, Faculty/Staff, Malang, East Jawa, Indonesia

pH Instruments Search Form

Related eNewsletters
See More

Also on GlobalSpec...
  • Receive email updates on new products and suppliers of interest to you
  • Online, interactive conferences / trade shows featuring latest news and industry trends
  • CR4
    Q&A and discussion for the engineering, scientific, and technical community
  • Engineering and scientific news from hundreds of sources
  • Industrial manufacturers and distributors