627 Quick Union In-line pH Sensor, resistant to Sulfide Cyanide and Ammonia

/627 Quick Union In-line pH Sensor, resistant to Sulfide Cyanide and Ammonia

627 Quick Union In-line pH Sensor, resistant to Sulfide Cyanide and Ammonia

Quick-Union In-line pH Sensor

The model 627 quick-union in-line pH sensor is offered in an easy-to-install configuration for insertion or submersion applications. The union-style threaded fitting locks in the sensor for extra safety and very easy removal. This sensor is designed to survive in cyanide, sulfides and ammonia environments often found in mines, concentractors and refineries.

It is bigger and more rugged than a conventional pH sensors.  The patented ‘solid polymer’ pH reference design is used to give fast response and long life even with constantly fluctuating temperature, pressure, oily coatings  and poisoning ions.   The sensor body is CPVC (or optional PVDF) with the sensing electrode encapsulated with a PPS liner for prolonged reliability.


Installation & Maintenance – easy and safe!

  • This sensor in offered in an easy to install configuration for submersion or insertion applications.
  • Recommended for applications where frequent removal in tough application for calibration, cleaning or quality control checks is required.
  • For in line installation, the threaded fitting locks in the sensor for extra safety and easy removal. No twisted leads.
  • For submersion installation, it mounts on a 3/4″ FNPT thread in the end of a support pipe or it can be suspended from it’s lead.
  • Cleaning and calibration supplies available in kits or sold individually.
  • Free How-to procedures to install, clean, calibrate and troubleshoot your sensor.
  • Free Application Development, Customer Satisfaction, Technical Support and Field Service teams to support you before and after installation.
  • Free Technical Articles and maintenance tips to keep you current.



  • Signficant savings are realized from ‘no pH error’ and sustainable recoveries at lower cost.
  • This sensor is not affected by hydrogen sulfide, cyanide, ammonia, nictric acid, strongs acids or high chlorides.
  • The ‘soild junction’ stops ion flow and it’s resulting drift.  The reference can not be poisoned.
  • It is not affected by flotation chemical filming agents that clog or plug proous junctions.
  • The sensor is big and rugged to survive shocks, sharp rock abrasions, being dropped in a chemical cleaner bucket and possibly even being run over by a truck.
  • Union fittings allows the sensor to rotate so the body flutes deflect abrasive particles.
  • No maintenance pH reference.
  • Reduced environmental waste due to the operating life of the sensor typically lasting 3 – 5 times longer than conventional pH sensors.
  • Reduced inventory, universal
  • Complete encapsulated design allows total submersion.
  • Compatible with all pH analyzer brands.  Some brands may require an interface component.


Selection Guide
User Manual
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pH Theory and Measurement

pH Measuring techniques, the sensing versus the reference electrode, etc
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pH/ORP Sensors in Metallurgical Applications

Critical Elements of the Sensor, Material Selection, Sensor Size Matters, Keeping Contaminants Out, Taking the Heat, Direct Connect versus Preamp.
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Download Questionnaire (PDF)

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Wiring Diagram

pH Sensor to Analyzer Connection

Electrical Schematic for Model 602, 605, 606, 607, 614, 615, 617, 625, 627, 642, 643 and 648
Wiring Diagram