Industrial online pH measurement

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Industrial on-line pH measurement control
The Easy Way!
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• Universal AnalyzersFounded 1985
• Ted Barben, President
• Jim Walden, CFO
• Bob Bertik, Sales Manager
• Stack gas sample conditioners
• Gas chillers
• PLC sample system controls

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• 1963 Invented double junction sensor,
  founding engineer Uni-Loc Corp.
• 1975 Invented wood-cored pH sensor, founding
  engineer TBI
• 1990 Founded Universal Analyzers
• 2001 Invented Axial Ion Path pH sensor,
  founder B.A.T.

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• Barben Analyzer Technology, LLCFounded 2001
• Don Peterson - Sales Marketing Harvey
  Mitchell - Operations
• pH/ORP/Conductivity sensors
• Transmitters / Analyzers
• Process control
• Installation accessoriesIntegrated systems

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pH - the Power of Hydrogen Yeah, but what does
itreallymean?
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A range of 10 trillion to 1
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Glass electrode
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0 828 mv
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0 828 mv
Reference cell
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414 mV nominal
0 828 mv
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414 mV nominal
0 828 mv
/- 414 mv
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0 pH 414 mV
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14 pH - 414 mV
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7 pH 0 mV
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Slope
1 pH unit 59.16 mv
100 efficient
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Offset
Reference mV drifts high or low
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Non-linearity
Errors at very high and very low pH values
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Temperature
Causes slope error due to glass electrode
impedance change.
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It requires 20 30 minutes for a good industrial
pH sensor to heat-soak and change temperature
from 950C to 250C or 250C to 950C.
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Temperature
Causes buffer pH to change from nominal value.
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What is the pH of 4 buffer? What is the pH of 7
buffer? What is the pH of 10 buffer?
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The illusion of accuracy
Buffer problems

• Aging oxidizing buffers
• Different temperature curves
• Mixing during calibration
• Contamination
• Changing junction potentials
• Streaming potential

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It requires 45 minutes to 1 hour for a good
industrial pH sensor to re-equilibrate from
buffer to process.
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The illusion of accuracy
pH is not a stable measurement

• Flow
• Pressure
• Temperature
• Meas Errors

• Oxidation
• Interferences (high-sodium)
• Mixing

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Issues and concerns - Lab

• Lab sample not taken at point of in-line
  measurement
• Temperature changes
• Oxidation
• Mixing
• Contamination
• Chemical reactions in sample
• The illusion of accuracy

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Issues and concerns - Lab
pH of pure water 18C 7.12 25C 7.00 50C 6.64 70C 6.
41 90C 6.23
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Issues and concerns - Process

• Measurement not stable drift
• Slow response time
• How do you know when the sensor is dying?
• Trusting the measurement

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Process Trace
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Issues and concerns E I

• Lab doesnt agree with calibration
• Too much time to clean calibrate
• Sensor repair maintenance difficult
• Transmitters hard to configure use

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How long does it take to buffer calibrate a hot
process sensor? 45 minutes to 2 hours if done
correctly
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Last step Argue with lab guys about why your
carefully done 2 point buffer calibration doesnt
agree with their lab sample!!!!
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The bottom line on buffer calibration
Buffer calibration of industrial process sensors
has a / - 0.2 pH unit error if done correctly.
If not done correctly, it is likely to be /- 0.5
pH units or more.
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Total time 30 sensors X 1 hour X
26 780 person-hours/year!!!
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Inadequate cleaning and calibrating pH sensors

• High use of caustic acid
• Poor product quality
• EPA violations
• Increased lab-sampling costs
• Increased pH sensor failures

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We need to make it simple, reliable, and
repeatable
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Single point standardization

• Accurate
• Repeatable
• Reliable
• Fast

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• Use good quality portable analyzer
• Buffer-calibrate portable in lab
• Clean sensor as required (brushing your teeth
  regularly is better than having them replaced)

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• Measure sample at in-line measurement point
• Standardize xmtr using 98 slope
• If sensor health is in doubt, buffer quick
  check with /- 3 buffer

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Perfection is the enemy of good enough
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30 sensors X 15 min X 26 195 person-hours/year
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A superior industrial pH sensor
Is not the same as a good lab sensor
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A superior industrial pH sensor

• Rugged body
• Toughened glass
• Poison resistant
• Tolerates Hi-temperature

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A superior industrial pH sensor

• Withstands Hi-pressure
• Tolerates fluctuating pressure
• Chemical resistance
• Easy to service

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• Temperature and Pressure
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• BAT offers sensors capable of temps to 2800F
  (1400C)
• BAT offers sensor systems capable of 2,500 psi
• Rugged Stable

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• Transmitters Analyzers
• 2 Wire 4 Wire
• Hazardous Duty Cl 1 Div 1 Div 2
• On-board process control
• HART Capability

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• Transmitters Analyzers
• Diagnostics
• Single and Multi-input models
• Profibus Foundation Fieldbus
• 3-year warranty

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Benefits of choosing BAT as your pH Partner

• Origin of most pH sensor technologies in use
  today

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Benefits of choosing BAT as your pH Partner

• Most experienced pH knowledge base

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Benefits of choosing BAT as your pH Partner

• Sensors designed to provide longest life in
  demanding applications

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Benefits of choosing BAT as your pH Partner

• Sensors designed for harsh process environments

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Benefits of choosing BAT as your pH Partner

• Wide range of sensor options, insuring
  performance and economy

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Benefits of choosing BAT as your pH Partner

• Wide range of installation accessories and
  options, insuring ease of use and maintenance

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Benefits of choosing BAT as your pH Partner

• Auto-Clean Auto-Calibrate systems improve
  sensor life and reduce maintenance hours

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Benefits of choosing BAT as your pH Partner

• Modern, durable, easy to use transmitters
  analyzers

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Benefits of choosing BAT as your pH Partner

• Cutting edge PLC technology allow multi-sensor
  analysis flexible control functions

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Benefits of choosing BAT as your pH Partner

• Quick order fulfillment

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Benefits of choosing BAT as your pH Partner

• Lowest overall cost due to longer life reduced
  man-hour requirements

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Thank you for choosing Barben Analyzer
Technology, LLC pH / ORP Conductivity Dissolved
Oxygen Turbidity Suspended Solids