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Signet pH / ORP Electrodes for use with 5700, 8750,8900 and 9900 controllers

2724-2726 pH-ORP Electrodes - download tech sheet

The Signet 2724 & 2726 pH and 2725 ORP Electrodes features a patented reference electrode design and uses the unique foul-proof patented DryLoc® connector. The large area PE reference junction and pathway is constructed to increase the total reference effectiveness and ensures long service life.

The DryLoc connector with corrosion resistant gold plated contacts readily connects the sensor to the mating 2760 preamplifier or the 2750 sensor electronics. The robust Ryton® threaded sensor body and choice of flat pH, bulb pH, or flat ORP sensing elements provides broad range of chemical compatibility for a wide variety of applications.

There are two optional sensing versions, -HF and -LC, available. The quick temperature response is available in either a PT1000 or 3 KΩ temperature sensor and allows compatibility with all Signet pH/ORP instruments. The 2724-2726 electrodes are general-purpose sensors ideal for a wide range of applications. The sensors incorporate ¾” NPT or ISO 7-1 R¾ threads for installing into standard pipe-tees. They can also be mounted directly into Signet standard fittings.


Key Benefits and Features:



download 2724-2725-2726 tech sheet

See below for special purpose pH / ORP electrodes

2760 DryLoc® pH-ORP Preamplifiers and 2750 Connectors  

The Signet 2750/2760 pH/ORP Preamplifiers features the DryLoc® connector, providing a robust connection to Signet DryLoc® electrodes. The DryLoc® electrode connector system quickly forms a robust assembly for submersible and in-line installations. NEMA 4X junction enclosures are to extend the preamplifier cable to long distances.

Use 2760 with Signet pH or ORP instruments except 8900/9900 - The 2760 preamplifier allows any DryLoc® pH/ORP electrode to work with Signet ProcessPro® and ProPoint® pH/ORP instruments. It is also sold as a simple connector for use with other manufacturers’ instruments that do not require a pre-amplified signal.  The 2760 submersible preamplifier can also be used as an In-line preamplifier when used with the ¾ in. or 1 in. threaded sensors including the 2724, 2774 and 2764 series electrodes. The 2760 In-line preamplifier can be used with Signet fittings up to DN100 (4 in.) and wet-tap assemblies.  download 2760 tech sheet

Using the 2750 as a blind 4-20mA transmitter - additional details

Use 2750 for 4-20mA output or Signet 8900/9900 Multi-Parameter controller - The 2750 preamplifier for use with Signet 8900 (S3L) or 9900 output or 4-20mA output.  EasyCal provides for calibration of electrode when using to provide a 4-20mA signal for a PLC or other device. download tech sheet


Standards: CE                                download 2750 tech sheet      download 2760 tech sheet

3-2760-1 Pre-amp with 3/4" FNPT threads for NPT fitting - inline or submerged (gray body)
3-2760-11 Pre-amp for inline with Signet fitting or wet-tap Yellow body 
3-2750-1 Pre-amp for inline with 8900 / 9900 Yellow body
3-2750-2 Pre-amp for inline with EasyCal for 4-20mA output Yellow body
3-2750-3 Pre-amp with 3/4" FNPT threads for NPT fitting - inline or submerged (gray body)

3-2750 and 3-2760 are available with ISO R3/4 threads - contact KTH Sales.

2774-2777 Threaded DryLoc® pH-ORP Electrodes

The Signet 2774 - 2777 pH and ORP Electrodes feature a unique foulproof DryLoc® connector with goldplated contacts designed specifically for use with the Signet 2750 and 2760 preamplifiers, sensor electronics, and connectors. These dependable and highly responsive electrodes feature a PTFE double reference junction with KNO3 in the front chamber to block various poisoning ions. Embedded positioning of the temperature element in the pH sensing tip allows the temperature response to be quick and accurate.

The electrodes are offered with either flat or bulb style sensing elements. The flat versions allow sediment and particles to sweep past the measurement surface, minimizing risks of abrasion, breakage and coating. The bulb versions can be used for general purpose applications. Due to the specially designed chambers which keep electrolyte in place, all versions can be mounted at any angle, even inverted.

Fields of Application:

  • Water Treatment & Water Quality Monitoring
  • Demineralizer, Regeneration & Rinse
  • Cooling Tower and Boiler Protection
  • Aquatic Animal Life Support Systems
  • Pool and Spa Control
  • Neutralization Systems


  • Durable DryLoc connector with gold plated contacts
  • Special design allows mounting at any angle
  • Quick temperature response
  • High temperature versions available
  • Easy sensor replacement using DryLoc electrode connector
  • Mounts into standard 3/4 inch threads

Download tech sheet 2774-2777

2764-2767 Differential DryLoc® pH-ORP Electrodes

The Signet 2764-2767 Differential pH & ORP electrodes are built with the DryLoc® connector a Ryton® body and TeflonT reference junction to handle even the most extreme and harshest of chemical applications.

These differential electrodes use field-proven 3-electrode differential technique: the pH and reference electrodes are measured against a ground electrode, ensuring a steady and stable signal. A key feature is the reference electrode which is protected in a glass half-cell embedded in the reference chamber and is protected from compounds that may contain sulfides (S2-) and metals. To ensure long service life, the reference features a refillable electrolyte chamber and a replaceable equitransferant salt bridge. The patented porous PTFE reference junction resists fouling, clogging and chemical attack.

Other elements of the design are the solution ground, the pH/ORP electrodes, and the temperature element. The solution ground eliminates noisy measurements by draining electrical current away from the reference electrode. The pH/ORP electrodes are designed with a flat or bulb measurement surface, and a temperature device that is positioned at the tip of the measurement surface, making the temperature response of T95% less than 1 minute. Various temperature devices offered include 3 KΩ, 300Ω, or PT1000 RTD. The electrodes are used with the Signet 2750 Sensor Electronics, which provide a blind 4 to 20 mA output or use the digital (S3L) output to connect to Signet's 8900 Multi-Parameter Controller. The electrodes can also be used with the Model 2760 preamplifier to connect to the Signet's 5700 or 8750 instruments.

Fields of Application:

  • Plating Baths
  • Textile Dye Process
  • Harsh Chemical Applications
  • Heavy metal Removal and Recovery
  • Toxics Destruction
  • Surface Finishing


  • Field-proven differential design for stable measurements in the most aggressive applications
  • Water-tight DryLoc connector with foulproof gold contacts
  • PTFE reference junction
  • Rebuildable reference electrode
  • Solution ground
  • Integral temperature sensor. Quick temperature response
  • Easy sensor replacement using DryLoc electrode connector
  • Compatible with other suppliers' instruments

Download tech sheet 2764-2767

3719 pH-ORP Wet-Tap

The Signet 3719 pH/ORP Wet-Tap allows installation and removal of pH or ORP electrodes (2756 /2756) without the need for process shutdown during routine electrode maintenance and calibration. Process isolation is achieved with a double O-ring seal on a unique and compact retraction assembly; no separate valve is required. A camactivated automatic locking mechanism, SafeLoc™, and the short stroke design help to assure operator safety. The wet-tap unit can be mounted at any angle and can be used with the Signet DryLoc Wet-Tap electrode.

Fields of Application:

  • Aquatic Animal Life Support Systems
  • Recreational Water Monitoring
  • Water & Wastewater Treatment
  • Effluent Monitoring
  • Neutralization Systems
  • Sanitisation Systems
  • Pool and Spa Control


  • Removes electrodes from pressurized systems for routine service or replacement
  • Automatic process isolation upon electrode retraction - no separate valve required
  • Space saving 45 mm (1.75 in.) short-stroke design
  • Sealed pneumatic dampening for smooth and safe operation
  • SafeLoc™: Camactivated automatic locking mechanism (patent pending)
  • Compatible with DryLoc Electrodes for use with 2750 pH/ORP Sensor or 2760 DryLoc pH/ORP Preamplifiers and Connectors
  • Large reference volume for long electrode life
  • Protects electrode sensing surface from breakage
  • pH electrode includes integrated temperature sensor
  • Low profile Clamp-on Saddle Fittings for convenient installation in ASTM pipe sizes 2.5 to 12 in.

Download tech sheet 3719

Use 2756 pH electrode or 2757 ORP

2714 and 2716 CPVC body General Purpose Electrodes  (Obsolete)

NOTE2714-electrode.jpg (10473 bytes)

Model 3-2714 and 3-2716 pH electrodes should not be used except as replacements. Until 2015.

Model 3-2715 and 3-2717 ORP electrodes should not be used except as replacements. Until 2015

- the required 2-2720 pre-amp has been discontinued as is NOT available from the factory - March2010

pH Probe - requires Pre-Amp - see below

Model 3-2714 - flat surface resists fouling - for use in most industrial applications 

Model 3-2714-HF - flat surface in applications with trace hydrofluoric acid 

Model 3-2716 - bulb type provides the best choice for most applications for pool/spa and surface waters 

Model 3-2716-DI - bulb type for use with pure water 

Signet 2715 / 2717 ORP electrode


  • Twist and lock with Pre-Amp (Model 2720)
  • Double junction combination electrode
  • Reference: Ag/AgCl
  • Platinum sensing surface
  • Porous UHMW polyethylene ref. junctions
  • May be used inline or submerged
  • CPVC construction - Double Viton O-Rings seals

3-2715 Flat ORP electrode - resists fouling for most heavy industrial applications. 

3-2717 Bulb ORP electrode - for general service use.   

Dimensions and installation data

Instruction Sheets - All - PDF file format

Signet Index

KTH Sales, Inc - phone: 219-736-0060 - fax: 219-769-0263  - e-mail: sales@kthsales.com