Thermo Fisher Scientific
Waltham, MA 02454
Sep 02, 2008 Featuring refillable epoxy body design, ROSS Ultra Triodes offer precision of 0.01 pH unit, accuracy within 0.03 pH units when using automatic temperature compensation, and fast temperature response within 1°C. Units are compatible with samples containing TRIS, proteins, and sulfides. Available in 4 different models depending on which meter customer has, all electrodes have waterproof BNC connectors for pH measurement.

GF Piping Systems
Tustin, CA 92780-7258
Aug 01, 2008 Featuring foul-proof DryLoc connector and Ryton® sensor body to provide chemical compatibility for use in wide range of applications, Models 2724-2726 Signet DryLoc pH/ORP Sensors can mount into standard Signet 0.50-4 in. fittings as well as Georg Fischer tees and off-the-shelf reducing tees ¾ in. or larger. Retrofitting into existing ¾ or 1 in. tees can be done by using reducer bushing. Sensing elements are available in various configurations, and all provide 4-20 mA output.

Emerson Process Management / Process Liquid Division / Uniloc Division
Irvine, CA 92606
Nov 02, 2007 Featuring plastic-threaded connections, Rosemount® Analytical PERpH-X(TM) 3500 can handle aggressive fouling applications. Double junction AccuGlass pH glass electrode is resistant to thermal and caustic degradation, and removable slotted tip protects glass bulb from direct impacts. Replaceable porous Teflon liquid junction has surface area optimized to maintain steady reference signal, and potassium-chloride-based reference electrolyte is unaffected by thermal/pressure cycling.

SpectrEcology, LLC
Dunedin, FL 34698
Oct 17, 2007 Embedded in wall of standard 1 cm cuvette, pHuvette is optical pH sensor that traps bromcresol green pH indicator ions in hydrophilic sol-gel cage, and can be used with any spectrophotometer to provide accurate stable measurements of pH of fluid contained in cuvette. Including embedded oxygen sensor, pHoxyvette smart cuvette detects O₂ by using phase fluorimetry to measure fluorescence quenching, while pHoxyvette cuvette comes with both pH and pO₂ sensors.

Thermo Electron Corp.
Waltham, MA 02454
Jan 12, 2007 At less than 3 mm in diameter, ROSS Micro pH Electrode (Model 8220BNWP) can be used with Orion PerpHecT® meters to enable measurement of pH while allowing for direct temperature measurement and compensation without separate ATC probe. Used independently or in conjunction with Orion meters, Micro Automatic Temperature Compensation Probe (Model 928007MD) features SS sensing tip measuring less than 1 mm in diameter, allowing users to obtain temperature of samples as small as 10 µL.

Analytical Technology, Inc.
Oaks, PA 19426
Dec 20, 2006 Available in several mounting configurations, pH/ORP sensor utilizes sealed reference design where second glass pH electrode acts as reference element to protect sensor from chemical poisons. Electrode used for ORP measurement can be platinum or gold depending on process solution. Pre-amplifier encapsulated in body ensures stable readings in harsh environments, while sensor diagnostics alerts user in event of electrode breakage, or integral temperature sensor failure.

Norcross Corp.
Newton, MA 02458 1829
Sep 13, 2006 Installed directly in fluid line, In-Line pH Sensor incorporates transmitter, which converts mV signal to 4-20 mA for transmission to controller. Featuring flat tip probe with glass insert, sensor has integral reservoir, which traps fluid to keep probe tip wet during job changes and to prevent drying out. Applications include liquid chemical processes such as water-based printing inks, food production, pharmaceutical, and general manufacturing.

Emerson Process Management / Process Liquid Division / Uniloc Division
Irvine, CA 92606
Sep 11, 2006 Models 3300HT and 3400HT pH sensors handle pressures of 100 psig at 145°C or 250 psig at 100°C. Model 3400HT retractable design allows removal for calibration and maintenance without process shutdown, while 3300HT insertion/submersion design allows variable insertion depths and removal without twisting. Sensors feature pH-resistant glass formulations, replaceable Teflon® reference junction, and chemically resistant Ryton(TM) body. Several mounting and cabling options are available.

Emerson Process Management / Process Liquid Division / Uniloc Division
Irvine, CA 92606
Oct 12, 2005 Model 398 TUpH® pH/ORP Sensor employs PEEK plastic helical reference pathway that protects reference element from chemical attack. Resistant to oxidants and organic solvents, sensor integrates AccuGlass pH electrode to resist cracking and SILCORE triple-seal contaminant barrier to protect integrity of pH measurement. Product is constructed of chemical-resistant titanium and Tefzel® and suited for applications in pulp and paper, chemical, and plastics manufacturing.

Honeywell
Golden Valley, MN 55422 3935
May 13, 2004 Durafet III pH electrode, featuring IP68-rated Vario Pin watertight connection, delivers response times that allow real-time pH control. Non-glass, unbreakable sensor is also available in sanitary version to meet 3A standards for food and dairy, pharmaceutical, and biotech applications. Additional industrial and sanitary applications include wastewater influent/effluent monitoring, neutralization, reagent addition control, and plating.

Thermo Electron Corp.
Waltham, MA 0245-11105
Apr 01, 2004 Orion ROSS Ultra screw-cap electrodes are available in standard glass-bulb, flat-surface, semi-micro, and epoxy-bodied styles to best determine pH of variety of sample types. Screw-capped electrodes accommodate applications such as titrations. ROSS Ultra half-cell reference electrode is available for applications where separate sensor and reference electrodes are preferred.

Walchem Corp.
Holliston, MA 01746 1460
Mar 04, 2004 Constructed with glass electrode that is not prone to chemical attack, WDS Series differential pH and ORP sensors transmit signals up to 3,000 ft and are resistant to ground loop problems. Sensors can be replaced if reference solution becomes contaminated or salt bridge becomes clogged. Reference electrode is constructed from pH glass and is embedded in pH 7 buffer within sensor behind porous, replaceable salt bridge.

Emerson Process Management / Rosemount Div.
Chanhassen, MN 55317
Jul 08, 2003 Rosemount Analytical TUpH pH sensors feature SILCORE(TM) technology, a triple-seal contaminant barrier that hinders moisture and material impurities from migrating to pH electrode's metal lead wire. Secondary helical reference pathway hinders reference poisoning, while ACCUGLASS(TM) pH glass formulations minimize glass cracking. Predictive sensor diagnostics alert user to need for calibration, maintenance, and replacement before failure occurs.

Orion Research, Inc., A Sub. Of Thermedics, Inc., A Thermo Electron Co.
Beverly, MA 01915-6199
Feb 19, 2003 Available in rugged and standard glass bulb, flat-surface, semi-micro, and epoxy-bodied styles, ROSS Ultra™ pH electrodes use virtually drift-free reference system that is unaffected by temperature or composition. ROSS Ultra half-cell reference electrodes are also available for applications where separate sensor and reference electrodes are preferred.

Hach Company
Loveland, CO 80539-0389
Jan 28, 2003 pHD™ series uses 3 measuring electrodes. Process electrode and standard electrode measure pH differentially with respect to third ground electrode. Technique provides reduced reference junction fouling and virtually eliminates ground loops.

Mettler-Toledo Process Analytics
Bedford, MA 01730
Oct 23, 2002 With application field including suspensions, solvents, acids, and alkalis, InPro® 4250 electrode offers 0-14 pH range and integral temperature sensor. Its XEROLYT®PLUS reference system consists of solid polymer, which does not require refilling of electrolyte. Pressure resistant for operation pressures up to 232 psig, XEROLYT®PLUS is in direct contact with measuring media using open junction (no diaphragm). Electrode is resistant to sulfide contamination.

Mettler-Toledo Process Analytics
Bedford, MA 01730
Oct 23, 2002 InPro 4800, with gel electrolyte, provides resistance towards oxidizing media, solvents, and acid or alkali solutions, with operating pressures to 188 psi at 266°F. Offerings include pressure-compensated reference system, diffusion path in 2 separated, reference electrolyte chambers, and dirt-repellant, annular PTFE reference junction. Unit also includes integral temperature sensor and watertight VarioPin plug connector.

AquaMetrix Inc.
Markham, ON L4B 3N4  Canada
May 08, 2002 AquaMetrix P65 has built-in, 2-wire, 4 to 20 mA transmitter and replaceable, double-junction, salt bridge for extended service life. It is available in 1 1/2 in. threaded body and 1 1/4 in. variable insertion depth models. Probe provides true, 3-electrode, differential pH measurement, which reduces ground loop interference.

GLI International, Inc.
Milwaukee, WI 53224
Mar 12, 2002 pHD(TM) electrode sensors use 3 measuring electrodes. Process and reference electrodes measure pH differentially, with respect to third ground electrode, reducing reference junction fouling and minimizing ground loops. Preamplifier boosts electrodes' mV signals for transmission up to 3,000 ft. PEEK(R) and Ryton(R) bodies provide chemical resistance in aggressive process solutions. Convertible, insertion, and sanitary mounting styles are available.