®

Field Devices For

Measurement & Instrumentation

Analytical

Optimize your plant performance with a reliable partner you can trust

FoxboroElectrochemical Sensors

Bring us your most difficult electrochemical measurement challenges. We have theintelligent Foxboro® analyzers, transmitters, sensors and solutions you need. Our 50year analytical history displays an entire galaxy of significant technical firsts. Today,
we supply more than just quality instrumentation. Our expert application specialists
tackle challenges from feasibility studies for new processes to fine-tuning your existing
application. We offer the widest array of innovative sensor technologies, materials, sizes
and geometries in the business. From ultrapure water to the most aggressive acids andbases, we can handle your process solution.
Operator safety is paramount in our facility. We have to find ways
to reduce operator exposure to hazardous fluids like strong acids.

The Foxboro 871FT Flow-through Conductivity Sensor is equipped with acalibration port on the outside of the sensor body. When the sensor needs to becalibrated, you can access the calibration port without breaking the process line,
thereby eliminating the risk to your operators from exposure to dangerous fluids.

We’re being driven to reduce inventory.
Unfortunately, when a pH sensor fails, we need areplacement right away. I can’t live with delivery times of 4 weeks or more.

Foxboro’s factory provides shipment within 24 hours for a long
list of measurement equipment, including several types of pHsensors. This service, referred to as “Rocket Delivery”, is provided
to our customers at no extra charge. All elements of sensor
manufacturing are performed in the Foxboro factory, allowing us
to provide rapid delivery and predictable high quality.

I have to decrease costs associated with maintenance of pH sensors. The constant cleaning and replacement ofsensors is eating up our maintenance budget.
Foxboro pH sensors are designed to reduce maintenance. Our patented DolpHin® sensor provides a Nafion ion
barrier which protects the internal reference electrode and reduces clogging of the outer junction due to silver
ion migration. Its nonmetallic solution ground allows for sensor diagnostics and provides excellent chemicalcompatibility. Its unique glass pH electrode provides long life in high temperature and temperature cycling
applications. All of these design features have been carried through to our new 12mm PH12 sensor as well.
“We can now complete a
pH adjustment in 3 hours
rather than the 18 to 24
hours it previously took.”
Senior TechnicalSupervisor
Gilead Sciences

fielddevices.foxboro.com

We have some very aggressive chemicals where we need to measure conductivity
and concentration. Most of the sensors we have tried only last a few months
before they fail due to chemical attack from the process.

Foxboro offers the broadest range of electrodelessconductivity sensors on the market. Our PEEK body sensors
use a proprietary sealing technique that eliminates theneed for internal seals. With no metallic wetted parts, thePEEK sensors do not suffer from leakage due to different
coefficients of thermal expansion, a weakness often seen inother suppliers’ sensors.

I’d like
to be able to tell when
the pH or reference electrode isin need of maintenance, before it
is too late.
Foxboro’s 875PH and 876PH Analyzers areequipped with a host of diagnostics for pHsensors. In addition to failure diagnostics, theseanalyzers include predictive diagnostics for reference
fouling, low slope and electrode aging. By monitoringthese diagnostics, the pH sensor can be scheduled formaintenance before failure occurs.

Analytical measurements are a problem for us
because we don’t have our own experts. I am
looking for a partner who can provide reliable
technical support and help us select the correctequipment for the application.
Foxboro’s Technical Assistance Center isstaffed 24/7 with experts in analytical products
and applications. We also have an analyticallaboratory where we can accept customer
samples to perform analyses such as conductivity
temperature compensation profiling.

fielddevices.foxboro.com

Success stories commercial benefits
Our pH sensors cut costs & optimize operations at Eastman Chemical company“Eastman’s equipment and maintenance costs were eight times lower than with previous
sensors, and efficiency of our scrubber operation was optimized.”
Wyatt Partney Senior Control Systems Technician

Chemical industry

Customer Challenge•
Existing sensors had to be replaced every 2 weeks-often 3 times a week. Inaccurate
readings meant unacceptably high manufacturing and maintenance costs
Solution•
Foxboro DolpHin pH sensors
Customer Benefits•
New sensors gave improved stability, accuracy, performance with up to fivefold increase
in sensor response speed while measuring 8.8 million pounds of chemicals per day•
Our pH glass formulation increased sensor life to six months; this longevity reduced
equipment and related maintenance/replacement costs eightfold•
Increased accuracy also meant operators reduced caustic, slashing caustic use levels bya remarkable 50%

Foxboro 871PH sensor improves pharmaceutical product, process and profits for Raylo Gilead

Pharmaceutical industry“We found many vendors offered quality sensors, Foxboro was the only one that could provide
a robust design that could stand up to all the reagents and solvents in our solutions.”
Rob Pastushak Snr Technical Supervisor of Pharmaceutical Manufacturing
Customer Challenge•
Improve efficiency of manufacturing process, specifically pH measurement in caustic
solutions, without impacting company bottom lineSolution•
Foxboro 871PH Sensor
Customer Benefits•Accurate pH measurement in demanding application, accurate to ±0.03 pH units•cGMP and FDA compliance & certification•
Less time for pH adjustment, three hours rather than the 18 to 24 it took before•
Less sampling - no longer need 40 samples to confirm measurement accuracy, only one
is needed now, as a matter of quality assurance protocol

Foxboro conductivity sensing sparks automated, efficient biodiesel fuel processing“..Conductivity sensing is really ideal for this application. A conductivity measurement system
is relatively inexpensive, very clean, and maintenance free. We brought in Invensys to discuss
its Foxboro products and decided these were the solutions we needed.”Scott Nisula Chief Technical Officer Delta BioFuels Inc

BioFuels industry

Customer Challenge•
To ensure that the production process of Delta BioFuel’s biodiesel would not beinterrupted during the fuel separation process. Sustainable alternative energy sourcesdemands an immediate technology solution that would produce a very pure biodiesel
product quickly and efficiently
Solution•
Foxboro 871EC Series Electrodeless Conductivity Sensors
Customer Benefits•The 871EC sensor enabled production of between 80-100 million gallons of biodiesel
per year, making it one of the largest biodiesel plants in the country•
Delta BioFuels achieved the production goals of its four 20,000-gallon reactors andcontrols the delicate separation process through accurate conductivity measurements•
By implementing a reliable and accurate process automation system, Delta BioFuels has
been able to eliminate human error and enhance overall product quality

fielddevices.foxboro.com/successReal-world applications
Chemical Industry: Sulfuric Acid Production
benefits with our conductivity sensor/analyserAIRCOOLERS

OLEUM TOWER

H2 SO4 TANKS

SULPHUR
SULPHUR
BURNERCATALYST TOWERCIRCULATIONOLEUM CIRCULATION TANKSTORAGEPower Generation: Recycling Emissions Control
by-products with DolpHin pH Sensor

FLUE
GAS

CLEANEDGAS TOATMOSPHERELIMESTONE
CaCO3

HYDROCLONE

STACK

HOT
WATER
WASH

MILL
BELT FILTERWATERLIMESTONESLURRYTANKCOMPRESSEDAIRThe demand for upgrading paper quality and uniformity
has introduced tougher challenges to on-line sensors withhundreds of hours spent each year cleaning pH sensors in thisvery aggressive process area. Between the thick consistency
stock and the periodic cleaning process, known as a boil-out,
pH electrodes typically have a very short life. The Foxboro
pH sensor range ensures longer sensor life due to a flat
ruggedized pH electrode. A retractable sensor installation
isolates the sensor during boil-out. Resistance to coatings
allows longer intervals between cleanings and improved
maintenance efficiency due to predictive sensor diagnostics
such as coated reference or low slope.

98% H2 SO4 TANKS

Producing sulfuric acid is a particularly demanding application.
The closer you come to 100 percent, the more difficult it is toaccurately measure acid strength: The higher the strength of
sulfuric acid, the greater its market value. The Electrodelesssensor design significantly minimizes the difficulties of buildup of process material. This provides an invasive sensor ofextraordinary integrity, which is robust even in this aggressive
application. This means improved process efficiency and lower
production expenses plus reduced material and maintenancecosts. In addition, precise and reliable measurement of highstrength sulfuric acid means consistent high-end productquality for improved profitability.

ABSORBER &OXIDIZER UNIT

Pulp & Paper Industry:
Paper Machine Wet End pH Control

INERTS TODISPOSALGYPSUM
BY-PRODUCTCaSO4HEAD
BOX
TRAYS
PUMP

WIRE
PITFANPUMP

CLEANERS& SCREENSALUMSTOCK FROM MACHINE CHEST

Pulp & Paper Industry: White Liquor Strength
production
The primary measurement challenge is holding tight,
temperature-compensated conductivity accuracy as thismeasurement has a direct effect on white liquor strength which
is used as a control parameter in the digester charging process.
Inaccuracy will occur due to electrode corrosion, polarizationor the conductivity sensor itself can become fouled. Foxboro
871FT offers longer sensor life due to corrosion resistant
PEEK material and coating effects are minimized due tothe use of electrodeless conductivity technology. Longer
intervals between calibrations are possible and they are
faster and safer due to the built-in calibration port. In addition
improved accuracy is possible due to optimized temperaturecompensation.

WHITE LIQUOR CLARIFIER

In gypsum production sensors are exposed to thousands oftons of flowing sludge, which is maintained at temperaturesof approximately 160°F (71°C). Gypsum forms as a crystalline,
abrasive substance, adding additional wear and tear. One
power facility tested our rugged pH sensors that can last up to
four times longer than conventional sensors, and became oneof the first sites in the world to implement a prototype. Other
advantages include accurate, reliable pH measurement indemanding applications, improved production and operational
efficiency, reduced waste disposal costs for environmental
compliance and the extended service life reduces maintenanceand materials costs.

WHITE LIQUOR
MUD MIXTANK

SURGE
CAUSTICIZERS

fielddevices.foxboro.com/applications

LIME
MUD
WASHER

Selection guide
FoxboropH and ORP Electrochemical Sensors

Model

PH DolpHin

ORP10 DolpHin

PH12871A

871PH

EP462A

Sensor Type

pH

ORP

pH/ORP

pH/ORP

pH/ORPpH low
conductivity

pH Range

0 - 14

N/A

0 - 142 - 120 - 140 - 14

Max Temperature

121 C

121 C

140 C

85 C

121 C

100 C

Installation Type

Universal slip fit,
Universal slip fit,
PG13 connection
Twist-lock,
Submersion,
Submersion,
Submersion,
Submersion,to accessories,
Submersion,
In-line, Retractable In-line, Retractable
In-line, Retractable In-line, Retractable In-line, Retractable
In-line, Retractable

Electrode Type

Domed or flat

Flat

Domed or flat

Flat

Selectable

Domed

Maintenance Type

Disposable

Disposable

Disposable

Disposable

Rebuildable

Disposable

Integral Pre-amp

Yes

Yes

No

Yes

Yes

NoFeatures

High performanceHigh performance

12mm form factor,
available lengths
120mm - 425mm

Totally flat sensing
surface

Small, inexpensiveplug-in electrodes

Stablemeasurements inhigh purity water

FoxboroElectrodeless and Flowthrough Conductivity Electrochemical Sensors

Model871ECEP307B

EP307G

871FT

EP402

FT10Sensor Type

Small andlarge bore

Barrel geometry

Borosilicate
glass

FlowthroughFlowthroughFlowthroughInstallation TypeInvasive, Insertion,
Immersion,
Retractable

Invasive, Insertion,
Immersion,
Retractable

Non-invasive, Inline, Threaded

Non-invasive, Inline, Flaretek tube,
NSP300 tube

Line Size

3” min3” min3” min0.5 to 4”

3/32 to 5/8”

1/2, 3/4 and 1”

Calibrate In-line

No

No

No

Yes

Yes

Yes

All Thermoplastic

Yes

Yes

NoNo

No

Yes

Non-invasive,
Invasive, Insertion,
In-line, Sanitary
Submersiontri-clamp, Industrial
flangefielddevices.foxboro.com

Selection guide
FoxboroContacting Conductivity and Resistivity Electrochemical Sensors

Model871CR

871CC

Mounting

Insertion, Immersion, Retractable

Insertion, Immersion, Retractable

Installation Type

Universal slip fit

Fixed installation type dictated by model code selection

Temperature
Compensation

1000 ohm 3-wire platinum RTD

100 ohm 2-wire platinum RTD or 100 kohm
2-wire thermistor

Accuracy

0.1 % of 0.1 cm-1 cell factor

2 % of 0.1 cm-1 cell factor

Insertion Lengths

Model code selectable

Fixed length

FoxboroTransmittersModel

875PH *876PH

875EC *876EC

875CR

876CR

Measurements

pH, ORP, ISE

pH, ORP, ISE,
Combination pH/ORP

Conductivity,Concentration

Conductivity,Concentration

Conductivity andResistivity

Conductivity andResistivity

2 or 4 wire

4-wire2-wire4-wire2-wire4-wire2-wirePower

V ac, 24 V dc

12.8 to 42 V dc

V ac, 24 V dc

14.7 to 42 dc

V ac, 24 V dc

12.8 to 42 V dc

Menu Driven with
Help Text

Yes

Yes

Yes

Yes

Yes

Yes

Inputs1 Sensor, 1 Temp

1 Sensor, 1 Temp
Combination pH/ORP

1 Sensor, 1 Temp

1 Sensor, 1 Temp

2 Sensor, 2 Temp

1 Sensor, 1 Temp

Alarms202020

Safety Certs

Class 1, Div 2 Non- Class 1, Div 1 and 2 Class 1, Div 2 Non- Class 1, Div 1 and 2 Class 1, Div 2 Non- Class 1, Div 1 and 2
Intrinsically safe
incendive
Intrinsically safe
incendive
Intrinsically safe
incendiveOutputDual 4 - 20 mA, HART4 - 20 mA, HART

Dual 4 - 20 mA, HART4 - 20 mA, HART

Dual 4 - 20 mA, HART4 - 20 mA, HART

Multi-application

--Yes

Yes

Yes

Yes

Custom curve--Multiple,auto-switching

Multiple,auto-switching

Multiple,auto-switching

Multiple,auto-switching

fielddevices.foxboro.com* 875CR version shown

Your Foxboro representative:

Invensys Operations Management
10900 Equity Drive
Houston, TX 77041 U.S.A
1.713.329.1600
iom.invensys.com

Invensys Foxboro
33 Commercial Street
Foxboro, Massachusetts 02035-2099 U.S.A
1.866.746.6477 Toll-free within U.S.A
1.508.549.2424 Global

Invensys, the Invensys logo, ArchestrA, Avantis, DolpHin, Eurotherm, Foxboro Eckardt, Foxboro, IMServ, InFusion, SimSci-Esscor, Skelta, Triconex,and Wonderware are trademarks of Invensys plc, its subsidiaries or affiliates. All other brands and product names may be the trademarks orservice marks of their representative owners.
© 2013 Invensys Systems, Inc. All rights reserved. No part of the material protected by this copyright may be reproduced or utilized in any
form or by any means, electronic or mechanical, including photocopying, recording, broadcasting, or by any information storage and retrieval
system, without permission in writing from Invensys Systems, Inc.

Part No. HA031609USA. Issue 1. 04/13
fielddevices.foxboro.com