Temperature Sensor with Wire Lead. Measures soil temperatureThe 200TS Temperature Sensor is a precision thermistor encased in epoxy potting compound for direct burial applications. It is ideally suited for measurement of soil temperature. If used for air temperature measurements, care must be observed to properly expose the sensor in a shaded housing, such as a solar radiation shield, to provide airflow around the sensor and minimize direct exposure to sunlight, rain and snow, so that the air temperature inside the shield is a good representation of the outside air. Also, the potting compound will have an insulating effect that will delay the sensor's response to temperature changes, which are more rapid in air environments than when buried.Features High Accuracy Fast Thermal Response Low Cost Small Size Epoxy Encapsulated High Stability Long LifeOperation Principle: The Model 200TS Temperature Sensor is a resistive device that responds to changes in temperature. As the temperature gets warmer, the resistance lowers. Once planted in the soil, it will change its resistive value as the soil temperature changes. The protective encapsulating material will tend to insulate and slow the response time if used for ambient measurements. The relationship of ohms of resistance to temperature is constant and built into the reading devices that are used to interrogate the sensor. The 200TS Temperature Sensor is a precision thermistor encased in epoxy potting compound for direct burial applications.Specification Information: The soil temperature measurement device, or sensor, shall represent temperature in degrees, using either the Fahrenheit or Celsius scale, when read with a compatible reading device. Its construction shall be durable, long-lasting, not subject to deterioration in a wet soil environment with an outer surface of epoxy potting and a corrosion resistant plastic sleeve. It shall be the Model 200TS as manufactured by the IRROMETER Company, Inc. of Riverside, California.