The DT233 model is a dual two-wire transmitter that isolates and converts millivolt or thermocouple sensor inputs to proportional 4-20mA control signals. Power is received from the output loop current.
The ST132 is a low-cost two-wire transmitter that converts a millivolt or thermocouple sensor input to a proportional 4-20mA control signal. Power is received from the output loop current. The transmitter performs signal linearization, cold-junction compensation, and lead-break detection functions.
TC type J, K, T, R, S, E, B, and N or ±100mV input
4 to 20mA DC output
The ST133 is a low-cost two-wire transmitter that isolates and converts a millivolt or thermocouple sensor input to a proportional 4-20mA control signal. Power is received from the output loop current. The transmitter performs signal linearization, cold-junction compensation, and lead-break detection functions.
Points of Consideration When Using Thermocouples to Measure Temperature
Thermocouples work by the temperature difference between one end of a conductor and the other end that produces the small electromotive force (emf), or charge imbalance, that leads us to the temperature difference across the conductor.
Since accuracy will ultimately play a significant role in selecting a sensor type, we should be familiar with potential sources of error when making temperature measurements with thermocouples. Some of these considerations may steer us from one T/C type to another, or perhaps to another sensor type, like RTD transmitters for example.
12 Points to Consider When Using Temperature Thermocouple Transmitters
Thermocouple Sensor Inaccuracy
Thermocouple Sensor Non-Linearity
Thermocouple Sensor Sensitivity
Sensor Drift, Aging, and De-Calibration
Choice of Extension Wire
Cold Junction Compensation
Thermal Shunting and Immersion Error
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