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Lake Shore Temperature Transmitters

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Lake Shore Temperature Transmitters

LakeShore

Model 231
The Model 231 operates with either silicon diode or gallium-aluminium-arsenide (GaAlAs) diode sensors. Excited with a 10µA current source from the Model 231, the sensors produce a voltage that depends on temperature. A microcontroller reads the voltage through an A/D converter and translates it into temperature using a temperature response curve. The Model 231 includes two standard curves for DT-470 and DT-670 diode sensors. It also supports a single CalCurve option for calibrated sensors (TG-120 diodes require a CalCurve).

Model 231P
The Model 231P uses a PT-100 Series platinum sensor. The Model 231P excites the sensor with a 500µA current to produce a measureable signal. Either the standard platinum curve (IEC 751) or a CalCurveTM is used for temperature conversion.

Model 234
The Model 234 operates with CernoxTM, garbon-glass, germanium, or other negative temperature coefficient (NTC) resistance temperature sensors. The Model 234 excites the sensor with a constant voltage of 10mV or less to minimise the effects of sensor self-heating at low temperatures. The Model 234 employs an analog control circuit to maintain a constant voltage signal across the sensor. A series of reference resistors convert the resulting sensor current to a voltage. A microcontroller reads the voltage with an A/D converter, calculates sensor resistance, and converts the resistance to temperature by table interpolation (requires a CalCurveTM for temperature conversion). The sensor excitation voltage is reversed each reading to compensate for thermal voltage and offsets.

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