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.
6561 pH Sensor:
The YSI 6561 pH sensor features a 'long-life' sealed gel reference, eliminating the need to refill. For high-fouling applications, the 6561FG'flat glass' sensor is available for wiped antifouling protection on the 6600EDS V2. 6565 pH/ORP Probe also available.
- Produces very stable readings.
- Rugged and guarded.
- Not wipeable; not ideal for high-fouling environments.
Sensor is available for use on the following sondes:
- 600XL & 600XLM and 600XL & 600XLM V2
- 600DW & 6920DW
- 6820 V2 & 6920 V2
- 6600 V2 & 6600EDS V2
Range: 0 to 14 units
Resolution: 0.01 unit
Accuracy: ±0.2 unit
U.S. EPA ETV