YSI pH and pH/ORP sensors have been carefully designed to perform under all ionic strength conditions, from seawater with a conductivity of 53,000 μS/cm, to "average" freshwater lakes and rivers with conductivities of 200 to 1500 μS/cm, to pure mountain streams with conductivities as low as 15 μS/cm, which has historically been the most difficult medium with respect to accuracy, quick response to pH changes, and minimal flow dependence.
ORP is determined by measuring the potential of a chemically-inert (platinum) electrode which is immersed in the solution. The sensing electrode potential is read relative to the reference electrode of the pH probe and the value is presented in millivolts.
6554 pH Sensor:
The YSI 6554 is a replacement pH sensor for use with YSI 600R and 600QS multi-parameter water quality. 65581 pH Probe and 6580 pH Reference also available.
This sensor requires service center installation – contact us to schedule your sonde for servicing.
Sensor is installed on the following sondes:
- 600R and 600QS
- Only the 6580 pH reference is user-replaceable
Range: 0 to 14 units
Resolution: 0.01 unit
Accuracy: ±0.2 unit
U.S. EPA ETV