1
TEROS 11/12
1.
INTRODUCTION
Thank you for choosing the TEROS 11 Soil Moisture and Temperature sensor and the
TEROS 12 Soil Moisture, Temperature, and Electrical Conductivity (EC) sensor from
METER Group.
The TEROS 11/12 sensors are designed to be installed in mineral soils, many types of
growing media, and other porous materials. This manual guides the customer through
the sensor features and describes how to use the sensor successfully.
TEROS 11/12 sensors are accurate tools for monitoring volumetric water content (VWC),
temperature in soil and soilless substrates, and
EC
(TEROS 12 only). The TEROS 11/12
determines VWC using capacitance/frequency-domain technology. The sensor uses a
70
-
MHz frequency, which minimizes textural and salinity effects, making the
TEROS 11/12 accurate in most mineral soils. The TEROS 11/12 uses a thermistor in the
center needle to measure temperature and
EC
(TEROS 12 only) using a stainless-steel
electrode array.
Prior to use, verify the TEROS 11/12 sensor arrived in good condition. METER
recommends testing the sensors with the data logging device and software before going
to the field.