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

Guardless Combination pH/ORP Sensor


Guardless Combination pH/ORP Sensor
'Guardless' pH and ORP for the 6600EDS

Simple, accurate pH and ORP (Oxidation Reduction Potential) measurement in a sensor designed for long-term deployment with the 6600EDS antifouling system.

The YSI 6566 guardless 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.

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 sonde:

  • 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