Water Quality System (WQS)
Field & Laboratory Meters
  • pH, SCT, DO & BOD, Multi-parameter Testing
Environmental Monitoring Systems (EMS)
Multi-parameter Water Quality Sondes
  • Sampling, Logging& Profiling

Integrated Systems & Services (ISS)
Environmental Monitoring Modules
  • Buoy& Floating Platforms, Profiling Systems, EcoMapper AUV

EMS_6 Series and EXO Water Quality Sondes

Combination pH/ORP Sensor


Combination pH/ORP Sensor
Reliable pH and ORP in a Single Sensor

Simple, accurate pH and ORP (Oxidation Reduction Potential) measurement in a sensor designed for minimal maintenance.

The YSI 6565 combination pH/ORP sensor features a 'long-life' sealed gel reference, eliminating the need to refill. The ORP sensor features a platinum electrode for optimum performance. For high fouling applications, the 6565FG 'flat glass' sensor is available for wiped antifouling protection on the 6600EDS V2.

YSI pH sensors have been carefully designed to perform under all ionic strength conditions, from seawater with a conductivity of 53,000 uS/cm,to "average" freshwater lakes and rivers with conductivities of 200 to 1500 uS/cm, to pure mountain streams with conductivities as low as 15 uS/cm, which has historically been the most difficult medium with respect to accuracy, quick response to pH changes, and minimal flow dependence.

This sensor is available for use on the following sondes:

  • 600QS (non-field replaceable version, not shown)
  • 600XL & 600XLM
  • 600DW & 6920DW
  • 6820 V2 & 6920 V2
  • 6600 V2-2 & 6600EDS V2

pH Specifications
Range: 0 to 14 units
Resolution: 0.01 unit
Accuracy: ±0.2 unit

ORP Specifications
Range: -999 to 999 mV
Resolution: 0.1 mV
Accuracy: ±20 mV