YSI EXO Conductivity & Temperature Sensor
Features
- 0 to 200 mS/cm measurement range
- T63<2 sec response time
- ±0.5% of reading or 0.001 mS/cm accuracy from 0 to 100
| Image | Part# | Product Description | Price | Stock | Order | |
|---|---|---|---|---|---|---|
 | 599870 | EXO conductivity & temperature sensor | Request Quote | In Stock | ||
| Image | Part# | Product Description | Price | Stock | Order | |
|---|---|---|---|---|---|---|
 | 065270 | 3161 conductivity standard, 1,000 uS, 1 quart | $74.10 | In Stock | ||
 | 065272 | 3163 conductivity standard, 10,000 uS, 1 quart | $74.10 | In Stock | ||
 | 065274 | 3165 conductivity standard, 100,000 uS, 1 quart | $74.10 | Usually ships in 3-5 days | ||
 | 060907 | 3167 conductivity standard, 1,000 uS, 8 pints | $126.35 | In Stock | ||
 | 060911 | 3168 conductivity standard, 10,000 uS, 8 pints | $126.35 | In Stock | ||
 | 060660 | 3169 conductivity standard, 50,000 uS, 8 pints | $126.35 | Usually ships in 3-5 days | ||
 | 599867 | EXO anti-fouling copper screen kit, pack of 2 | $78.00 | In Stock | ||
 | 599470 | EXO conductivity/temperature sensor cleaning brush, pack of 2 | $12.00 | Usually ships in 3-5 days | ||
The EXO combination conductivity and temperature sensor should be installed in a sonde in nearly all sonde applications. Not only will this sensor provide the most accurate and fastest response temperature data, but it will also provide the best data for the use in temperature compensation for the other EXO probes. The conductivity data is used to calculate salinity, non-linear function (nLF) conductivity, specific conductance, and total dissolved solids, and compensate for changes in density of water (as a function of temperature and salinity) in depth calculations if a depth sensor is installed.
Temperature Thermistor
The temperature sensor uses a highly stable and aged thermistor with extremely low-drift characteristics. The thermistor’s resistance changes with temperature. The measured resistance is then converted to temperature using an algorithm. The temperature sensor receives a multi-point NIST traceable wet calibration and the accuracy specification of 0.01˚C is valid for expected life of the probe. No calibration or maintenance of the temperature sensor is required, but accuracy checks can be conducted.
Conductivity Electrodes
The conductivity sensor uses four internal, pure-nickel electrodes to measure solution conductance. Two of the electrodes are current driven, and two are used to measure the voltage drop. The measured voltage drop is then converted into a conductance value in milliSiemens (millimhos). To convert this value to a conductivity value in milliSiemens per cm (mS/cm), the conductance is multiplied by the cell constant that has units of reciprocal cm (cm-1). The cell constant for the conductivity cell is approximately 5.5/cm ±10%. For most applications, the cell constant is automatically determined (or confirmed) with each deployment of the system when the calibration procedure is followed.
Temperature Compensation
EXO sensors have internal thermistors for quality assurance purposes. Turbidity uses the internal thermistor for temperature compensation, while all other EXO sensors reference the C/T probe for temperature compensation. To display and log temperature, a C/T probe must be installed in an EXO sonde. Thermistor readings are logged in the sonde’s raw data–viewable in KOR software–but are not included in data exported to Excel.
In The News
Tides and microbes transform nitrogen where streams and the ocean meet
Enormous amounts of excess nitrogen hit water bodies all over the globe, including the U.S., due to runoff from agricultural and other human activities. This nitrogen can cause dead zones and harmful algal growth. Before it reaches the ocean, microbes can process and remove some of it from stream sediments, connected aquifers and tidal freshwater zones. Thanks to this process, coasts can have a decreased likelihood of harmful algal blooms. Keeping coastal waters clean is important for many reasons, including the fact that about 60% of the U.S. population lives on coasts. But despite the importance of these nitrogen processes, researchers have not fully investigated how they work.
Read More
Climate, nutrients and the future of hypoxia in a Chesapeake Bay tributary
The Chesapeake Bay is the site of recurring seasonal dead zones: areas of low dissolved oxygen where aquatic life struggles to survive if it can at all. In 2020, a dead zone in the Maryland portion of the bay was one of the smallest since 1985, when record keeping began. The hypoxic area in the Virginia portion of the bay was smaller and briefer than many years previous. But the problem isn’t gone yet, and looking forward, climate change will play a big role in determining the size and severity of dead zones throughout the bay. It could make it harder to get hypoxia under control in some places.
Read More
Fecal bacteria rises with sea level on Texas beaches
As climate change lifts the sea level in the Gulf of Mexico, it’s lifting levels of enterococci bacteria on Texas’s beaches, too. New research out of the Gulf shows that high levels of enterococci bacteria, which come from humans and other animals and can cause disease, are correlated with proximity to large human populations and sea level rise and are increasing over time. The research highlights an area of growing concern for public health and safety on popular recreational beaches. While sea level is projected to continue rising, it’s not a guarantee that bacteria levels will as well.
Read More
