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pH/ORP Sensors

Our range of pH and ORP sensors are designed for a wide range of applications. At one end of the spectrum are sensors suitable for use in clean processes while at the other end, a range of highly robust sensors to suit tough and extreme measuring conditions.

DISCUSS SOLUTIONS WITH OUR EXPERTS

OUR pH AND ORP ELECTRODES PROVIDE THE VERY BEST READINGS IN MOST APPLICATIONS

There are so many different pH and ORP probes on the market, each with their own features and advantages. While it’s necessary to get a specific probe with specific features for some applications, the reality is that the majority of process pH and ORP measurements can be made with just a few different types of probe. Here at South Fork Instruments, we have distilled down our offering to just a few different models that will cover the vast majority of inline process measurements. Having a limited set of probes that adequately and reliably covers so many applications makes for lower maintenance costs and reduced spare parts holding.

We’ve also taken advantage of the latest Memosens™ digital technology, bringing even more cost savings to users through easier handling, more accurate calibration and expanded data and diagnostics availability. For users that haven’t upgraded to Memosens™, we have analog versions that will connect to just about any analog pH transmitter/analyzer in the field.

For “difficult” applications, REFEX pH and ORP probes are available. The REFEX reference is a patented, highly stable, non-porous polymeric interface. The active reference area comprises the entirety of the outside surface of the electrode and this extremely large contact area means that electrode performance is supremely resistant to coating. Drift and premature “death” from the poisoning effects of substances such as cyanide, ammonia and sulfides are eliminated because the polymeric reference material is conductive to ions but being non-porous, does not allow process material to diffuse into the cell; the reference operates electrically, but electrolyte and process fluids are not exchanged. Highly resistant to poisoning and electrode dilution, REFEX sensors can be used with great success in applications with oily/fatty process water/wastewater as they are largely impervious to the greater pollution loads these applications carry.

Probes are available in both industry standard 12mm diameter and large volume NPT threaded packages. A variety of pH glass types are available to suit various application needs and available reference junctions include PTFE, Ceramic, and polymeric materials. Additional options of ion trap or salt reserve are available to combat poisoning and electrolyte dilution. The high reliability of our pH/ORP sensor range ensures that maintenance requirements and cost of ownership are kept very low.

Need help selecting the pH System/Sensor for your application?

Use our handy 5-question selector to narrow down you best options.

pH SYSTEM SELECTOR

pH System Selector

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My application is difficult eg. because of aggressive chemical composition, tendency to foul.
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  • OPGTDJ

  • OCPS11E

  • OPS71D

  • OCPS81/82/81E/82E

  • OCPS77E

OPGTDJ

OPGTDJ

Typical Applications: Fermentation, Cell culture, Chromatography, Filtration, Buffer preparation, CIP, Process water monitoring, Leak detection, more…

Datasheet Download

OPGTDJ pH/ORP Sensors

Process Footprint 12mm Diameter with Pg 13.5 Connector
Electrode Length 120mm
Measured Values pH: 0…14
ORP: -1500…+1500 mV
Temperature: Pt100 and Pt1000 options available
Process Temperature Range -5…135°C
Process Pressure Range 0 to 34.4 bar (0 to 500 psig) @ 25°C
pH Impedance 150 MΩ at 25°C / 77°F
Minimum Conductivity 10 μS/cm
Response Time 95 % of reading in 10 seconds (@ 25°C / 77°F)
Connectivity Analog to standard pH analyzer
Connector and Rating Fixed Nut and Swivel Nut
NEMA 6/IP68
Process Contact Materials pH - Lead-free glass
ORP - Platinum/Glass
Reference System - PTFE / saturated KCl / AgCl
Reference System Ag/AgCl with double Junction PTFE diaphragms, saturated (> 3M) KCl gel electrolyte and salt ring reserve

OCPS11E

OPS11D
memosens logo

Typical Applications: Potable water/well water, Waste water, Cooling water, Boiler feedwater, General processes, Chemical processes, Scrubbers, Pulp and paper applications, Hydrofluoric acid applications (max 1 g/l), more…

Datasheet Download

OCPS11E Memosens Digital pH Sensor

Process Footprint 12mm Diameter with Pg 13.5 Connector
Electrode Length 120, 225, 360mm
Measured Values pH: A: 1…12,
B: 0…14,
F: 0…10

Temperature: PT1000
Process Temperature Range A: -15 to 80°C / 5 to 176°F

B: 0 to 135°C / 32 to 275°F

F: 0 to 70°C / 32 to 158°F
Process Pressure Range A, B: 0.8…17 bara / 11.6…246.6 psia

F: 0.8…7 bara / 11.6…101.5 psia
Ambient Temperature Do not use below -15°C / 5°F (risk of damage).
Minimum Conductivity 50uS/cm (0.1uS/cm with salt ring option)
Connectivity Memosens™ to compatible pH analyzer
Connector and Rating Memosens™ plug-in, non-contact style, NEMA 6/IP68
Process Contact Materials Lead-free glass (type A, B or F)

PTFE
Reference System Options available:

Ag/AgCl with 3M KCl gel electrolyte, AgCl-free

Ag/AgCl with saturated (>3M) KCl gel electrolyte and salt rings, AgCl-free

Ag/AgCl with ion trap and 3M KCl gel electrolyte, AgCl-free

A, B, F refer to different pH versions of the OCPF11E

OPS71D

OPS71D
memosens logo

Typical Applications: Fermentation, Cell culture, Chromatography, Filtration, Buffer preparation, Pharmaceutical formulation, CIP, Chemical processes, more…

Datasheet Download

OPS71D Memosens Digital pH Sensors

Process Footprint 12mm Diameter with Pg 13.5 Connector
Electrode Length 120., 225mm
Measured Values pH: 0…14
Temperature: Built in Temperature Sensor
Process Temperature Range TB: 0 to 140°C / 32 to 284°F

TU: 0 to 100°C / 32 to 212°F (continuous) 0 to 140°C / 32 to 284°F (sterilization)
Process Pressure Range TB: 0 to 140°C / 32 to 284°F

TU: 0 to 100°C / 32 to 212°F (continuous) 0 to 140°C / 32 to 284°F (sterilization)
Ambient Temperature Do not use below -15°C / 5°F (risk of damage).
Minimum Conductivity 10uS/cm
Connectivity Memosens™ to compatible pH analyzer
Connector and Rating Memosens™ plug-in, non-contact style
NEMA 6/IP68
Process Contact Materials Lead-free glass
Reference system - ceramic / saturated KCl / AgCl
Reference System TB: Ag/AgCl reference with ion trap, acrylamide-free, non-cytotoxic 3M KCl reference electrolyte

TU: Ag/AgCl reference with ion trap, acrylamide-free, 3M KCl reference electrolyte

OCPS81/82/81E/82E

OCPF8_D
memosens logo

Typical Applications: Flotation, Leaching, Process Water, Coagulation Optimization, Neutralization, Wastewater Monitoring, more…

Datasheet Download

OCPF81/82/81E/82E pH/ORP Sensors

Process Footprint ¾” NPT Male Thread
Measured Values pH: L: 0…14,
N: 0…11 (11…14 w/reduced accuracy)

ORP: -1500…+1500 mV

Temperature: Std for 81E/82E, optional for 81
Process Temperature Range L: 0…110°C / 32 to 230°F

N, P: 0 to 80°C / 32 to 176°F
Process Pressure Range 81E/82E: 0.8...11 bara / 11.6...159.5 psia

81/82: 1...10 bara / 15...145 psia
Ambient Temperature Risk of freezing below 0°C / 32°F)
Connectivity Versions available for connection to Memosens™ and analog analyzers
Connector and Rating Memosens™: NEMA 6/IP68
Plug-in Cable: NEMA 6/IP68
Fixed Cable: NEMA 4/IP67
Insertion Length Short Shaft: 23mm / 0.91”
Long Shaft: 58.5mm / 2.3”
Flat pH Membrane: 12.5mm / 0.49”
Process Contact Materials Housing: PPS (Polyphenylene sulfide)

pH Sensor: Lead-free Glass

ORP Sensor: Platinum/Glass

Reference Junction: PTFE
Cable Length (fixed cable versions) Std: 15’, 30’

L, N refer to different pH versions of the OCPF81/81E
P refers to OCPF82/82E ORP probes

OCPS77E

OCPS77E Sensor
memosens logo

Typical Applications: Biotechnology, Food Applications, Brewing, Dairy, more…

Datasheet Download

OCPS77E Memosens Digital ISFET pH Sensors

Process Footprint 12mm Diameter with Pg 13.5 Connector
Electrode Length 120, 225, 360mm
Measured Values pH: 0…14
Temperature: -15…135°C
Process Pressure Range 0.8 to 11 bar / 11.6 to 159.5 psia
Process Pressure/Temperature Limits Max. Operating: 11 bar / 160 psia @ 100 °C / 212 °F
Max. Sterilization: 4 bar / 58 psia @ 135 °C / 275 °F, 1 hr maximum
Minimum Conductivity 50 μS/cm
t90 Response Time < 5 seconds (buffer change from 4 to 7)
Connectivity Memosens Digital Communication to Local Analyzer
Connector and Rating Swivel Nut
NEMA 6/IP68
Process Contact Materials PEEK / FFKM / AgCl / Ceramic – Zirconium Dioxide
  • 2001 pH Comb.

  • 2002 ORP

  • 5610 pH Separate

  • 5710 Ref. Separate

2001 pH Comb.

Probes-2001-pH-Comb

Typical Applications: Potable Water, Optimized Coagulation, Low Ionic Raw Water, Ultra-Pure Water (UPW), Oil & Gas Sour Water, Petrochemical Process Water, Chlor-Alkali - Chlorinated and Waste Brines, Industrial Waste Water, Waste Water Treatment, Heavy Metal Processes, Pulp and Paper, more…

DATASHEET DOWNLOAD 2001 12mm pH Combination Electrode
DATASHEET DOWNLOAD 2001 NPT Threaded pH Combination Electrode
REFEX Technology Overview
See Video Non Porous Reference

2001 pH Combination Electrodes

Process Footprint 12mm diameter (with free turning Pg 13.5 connector), ¾” and 1” NPT (with fixed cable)
Electrode Length 12mm: 120, 225, 325, 425mm
¾” NPT: 145mm / 5.7” (20mm / ¾” immersion)
1” NPT: 145mm / 5.7” (64mm / 2½” immersion)
Measured Values pH: 0…12
Temperature: Optional Pt100 or Pt1000 sensor
Process Temperature Range 0 to 100°C / 32 to 212°F
Process Pressure Range 0 to 20 barg / 0 to 290 psig @ 50°C / 122°F
E0 Point 6.8 pH (±20mV)
Liquid Earth Point Optional with ¾” and 1” NPT probes
Connectivity Analog to compatible pH/ORP analyzers (dual high impedance inputs recommended)
Rating IP69
Impedance Glass: 200MΩ Nom.
Reference: <100kΩ
Process Contact Materials Lead-free glass
PPS (¾” NPT version)
PVDF (1” NPT version)
Reference system: REFEX™ polymeric junction
Cable Length 1m, 3m, 5m, 10m

2002 ORP

2002 Combination Electrodes

Typical Applications: Potable Water, Optimized Coagulation, Low Ionic Raw Water, Ultra-Pure Water (UPW), Oil & Gas Sour Water, Petrochemical Process Water, Chlor-Alkali - Chlorinated and Waste Brines, Industrial Waste Water, Waste Water Treatment, Heavy Metal Processes, Pulp and Paper, more…

DATASHEET DOWNLOAD 2002 12mm REDOX-ORP Combination Electrode
DATASHEET DOWNLOAD 2002 NPT Threaded REDOX-ORP Combination Electrode
REFEX Technology Overview
See Video Non Porous Reference

2002 Combination Electrodes

Process Footprint 12mm diameter (with free turning Pg 13.5 connector), ¾” and 1” NPT (with fixed cable)
Electrode Length 12mm: 120, 225, 325, 425mm
¾” NPT: 145mm / 5.7” (20mm / ¾” immersion)
1” NPT: 138mm / 5.5” (60mm / 2.36” immersion)
Measured Values ORP: -1500…+1500mV
Process Temp. Range 0 to 100°C / 32 to 212°F
Process Pressure Range 0 to 20 barg / 0 to 290 psig @ 50°C / 122°F
Connectivity Analog to compatible pH/ORP analyzers (dual high impedance inputs recommended)
Rating IP69
Impedance Reference: <100kΩ
Process Contact Materials Lead-free glass
Platinum
PPS (¾” NPT version)
PVDF (1” NPT version)
Reference System – REFEX™ polymeric junction
Cable Length 1m, 3m, 5m, 10m

5610 pH Separate

5610 pH Separate

Typical Applications: Potable Water, Optimized Coagulation, Low Ionic Raw Water, Ultra-Pure Water (UPW), Oil & Gas Sour Water, Petrochemical Process Water, Chlor-Alkali - Chlorinated and Waste Brines, Industrial Waste Water, Waste Water Treatment, Heavy Metal Processes, Pulp and Paper, more…

DATASHEET DOWNLOAD 5610 12mm Glass pH Electrode

5610 12mm Glass pH Electrode

Process Footprint 12mm diameter with free turning Pg 13.5 connector
Electrode Length 120mm
Measured Values pH: 0…12
Temperature: Optional Pt100 or Pt1000 sensor
Process Temp. Range 0 to 100°C / 32 to 212°F
Process Pressure Range 0 to 20 barg / 0 to 290 psig @ 50°C / 122°F
E0 Point 6.8 pH (±20mV)
Connectivity Analog to compatible pH/ORP analyzers
Rating IP69
Impedance Glass: 200MΩ Nom.
Process Contact Materials Lead-free glass
Cable Length 1m, 3m, 5m, 10m, 15m

5710 Ref. Separate

5710_12mm_Reference_Electrode

Typical Applications: Potable Water, Optimized Coagulation, Low Ionic Raw Water, Ultra-Pure Water (UPW), Oil & Gas Sour Water, Petrochemical Process Water, Chlor-Alkali - Chlorinated and Waste Brines, Industrial Waste Water, Waste Water Treatment, Heavy Metal Processes, Pulp and Paper, more…

DATASHEET DOWNLOAD 5710 12mm Reference Electrode
REFEX Technology Overview

5710 12mm Reference Electrode

Process Footprint 12mm diameter with free turning Pg 13.5 connectorr
Electrode Length 120mm
Measured Values Separate reference cell (for pH or ORP sensor)
Process Temp. Range 0 to 100°C / 32 to 212°F
Process Pressure Range 0 to 20 barg / 0 to 290 psig @ 50°C / 122°F
Connectivity Analog to compatible pH/ORP analyzers
Rating IP69
Impedance <100kΩ
Process Contact Materials REFEX™ polymeric junction
Cable Length 1m, 3m, 5m, 10m, 15m

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