Temperature Probes

The 6507, 6508 and 6535 temperature probes are designed for many applications of temperature measurement like air, water, soil, snow, ice, etc. They are fully sealed and can be used in fresh and seawater to a depth of 30 meters.

The 6507 thermistor temperature probes use a negative temperature coefficient (NTC) thermistor as their temperature sensor. The NTC thermistor is a high quality, precision curve matched element. Its operating temperature is from -100°C to 150°C.

Due to the type of cable being used, the measurement range of the standard thermistor temperature probe is from -30°C to 100°C. Accuracy of these probes is ±0.1°C making them ideally suited to measuring temperature profiles in water.

The 6508 very low power, precision SDI-12 temperature sensor is used for measuring temperatures between -20°C and 70°C. It is submersible, stable, 24-bit digital sensor ideal for measuring water, soil and ambient temperatures.
SDI-12 Version: V1.3, SDI-12 Command support: a! acknowledge, aI! return identification, aAb! change address, aM! aMC! start measurement and aD! return measurement data.

The 6535 linear temperature probe is used for measuring temperatures between -17.8°C and 100°C. It outputs a DC voltage, the value of which is directly proportional to temperature.
The linear temperature probes integrate the LM34 precision Fahrenheit temperature sensor whose output voltage is linearly proportional to the Fahrenheit temperature. The probe operates from 5V to 30V, does not require any external calibration or trimming to provide typical accuracies of ±11/2°F(°C) over a full -40°F (-40°C) to 240°F(115.5°C) temperature range. Due to the type of cable being used, the measurement range is ~-17.8°C to 100°C.

The LM34 draws only 75µA from its supply so it has very low self-heating; furthermore it has low output impedance and linear output making interfacing of this probe very easy.