Why is temperature important?

The rates of biological and chemical processes depend on temperature. Aquatic organisms from microbes to fish are dependent on certain temperature ranges for their optimal health. Optimal temperatures for fish depend on the species: some survive best in colder water, whereas others prefer warmer water. Benthic macroinvertebrates are also sensitive to temperature and will move in the stream to find their optimal temperature. If temperatures are outside this optimal range for a prolonged period of time, organisms are stressed and can die. Temperature is measured in de-grees Fahrenheit (F) or degrees Celsius (C).

For fish, there are two kinds of limiting temperatures the maximum temperature for short exposures and a weekly average temperature that varies according to the time of year and the life cycle stage of the fish species. Reproductive stages (spawning and embryo development) are the most sensitive stages. Table 5.5 provides temperature criteria for some species.

Temperature affects the oxygen content of the water (oxygen levels become lower as temperature increases); the rate of photosynthesis by aquatic plants; the metabolic rates of aquatic organisms; and the sensitivity of organisms to toxic wastes, parasites, and diseases.

Causes of temperature change include weather, removal of shading streambank vegetation, impoundments (a body of water confined by a barrier, such as a dam), dis-charge of cooling water, urban storm water, and groundwater inflows to the stream.

Model : ETS-40 series

Shown as the figure, it is the temperature sensor
– Outer tube material: Glass
– Plug-in Type Connector
– Measurement range: 2~90℃
– Selection of model:
•ETS-401(Pt100)
•ETS-402(Pt1000)
•ETS-403(NTC10K thermistor)
•ETS-404(NTC 2.252K thermistor)
– Size : Diameter 12mm – Length 161mm

[技 术 参 数] – 测量原理：Pt1000(STD), or Other
– 温度范围：2～90℃
– 电极尺寸：直径12mm,长度161mm – 电极材质：玻璃

Model : ETS-10 series

Shown as the figure, it is the temperature sensor
– Outer tube material: SS316
– Measurement range: -50～ +150℃
– Selection of model:
•ETS-101(Pt100)
•ETS-102(Pt1000)
•ETS-103(NTC10K thermistor)
– Size : Diameter 6.5mm – Length 120mm

[技 术 参 数] – 测量原理：Pt1000(STD), or Other
– 温度范围：50～150℃
– 电极尺寸：直径6.5mm,长度120mm – 电极材质：SS316