When To Call a Doctor. Call or other emergency services immediately if you have vertigo (a spinning sensation) and: 1  You passed out (lost consciousness). 2  You have symptoms of a stroke, such as:  Sudden numbness, tingling, weakness, or loss of movement in your face, arm, or leg, especially on only one side of your body.
High quality deionized water has a conductivity of about 5.5 Î¼S/m, typical drinking water in the range of 5-50 mS/m, while sea water about 5 S/m (i.e., sea water's conductivity is one million times higher than that of deionized water).n alternating voltage is used in order to avoid electrolysis. The resistance is measured by a conductivity meter. Typical frequencies used are in the range 1â3 kHz. The dependence on the frequency is usually small, but may become appreciable at very high frequencies, an effect known as the DebyeâFalkenhagen effect.
For PTCâs barium, strontium or lead titanates are commonly used. NTC thermistor The NTC type is used when a change in resistance over a wide temperature range is required. They are often used as temperature sensors in the range of -55Â°C to 200Â°C, although they can be produced to measure much lower of higher temperatures.