700 ULTRA-D pH/ORP digital sensor

The ultimate rechargeable sensor for demanding ultra-pure water pH accuracy

Featuring a rechargeable reservoir-fed design, the 700 ULTRA-D with EZLinkTM technology is capable of extended operation in ultrapure applications down to 0.2 μS/cm.



Enhanced with a triple ceramic junction design, the 700 ULTRA-D has improved speed of response while maintaining measurement stability in the most demanding high purity applications.

The 700 ULTRA-D sensor provides:

EZLink™  connectivity

  • Plug-and-play technology makes sensor integration fast and easy
  • Advanced diagnostics offering end-of-life indication and fault analysis
  • Improved measurement accuracy with digital communication

Increased efficiency

  • Propriety high performance glassware formulations provide the highest level of reliability and responsiveness
  • Close-coupled temperature measurement ensures high accuracy even with rapid temperature changes

Measurement confidence

  • Refillable KCl reservoir offering maximum usability and extended operation in high purity applications
  • Triple ceramic junction reduces plugging while providing improved measurement stability and speed of response
  • Each electrode is manufactured to the highest quality standards and provided with a calibration certificate

Modular design

  • 12 mm sensor paired with intelligent accessories provides simplified mounting
  • Optional 700 ULTRA sampling panel provides a complete system for simple integration
  • Available in a range of detached or integral cabling options


Measurement range
pH 0 to 14 pH
Redox (ORP)  –2000 to 2000 mV
Process temperature 
–5 to 100 °C (23 to 212 °F)

Pressure range

Recommended minimum sample conductivity

0.055 μS/cm

pH glass
High performance (S) glass (bullet)
Low temperature (LT) glass

Redox (ORP)

Reference system

Flowing KCl electrolyte with Ag/AgCl double junction

Reference junction

Connection type

Process connections
PG 13.5 

Approvals, certification and safety

  • CE Mark
    Covers EMC+LV directives (including latest version of EN61010)
  • Regulation 31
    Drinking water approval: Complies to DWI Regulation 31(4)(b)
    Additional tests: BS6920 parts 2.2 and 2.4 on all wetted parts
  • EMC
    Meets requirements of IEC61326 for an industrial environment


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