Budget price for four-channel thermocouple amp
An
Audon Electronics product story
Edited by the Engineeringtalk editorial team
May 26, 2003
The TCA-4 is a budget-priced four-channel thermocouple amplifier unit.
The TCA-4 is a budget-priced four-channel thermocouple amplifier unit.
This compact DIN-rail mounted unit has been designed to interface thermocouples, low level sensors and 4-20mA signals to data acquisition and process control systems.
The TCA-4 features four independent precision instrumentation amplifier channels, a thermocouple cold-junction compensation circuit and a wide input range power supply.
Channel gain and offset can be user adjusted via multiturn presets; a gain range from 20 to over 1000 is achievable.
Alternatively the TCA-4 can be ordered with precalibrated gains to suit any thermocouple type, giving a nominal output of 10mV per degree.
An onboard temperature sensor mounted close to the input terminals can be used to apply cold junction compensation on a channel-by-channel basis.
It is therefore possible to mix-and-match thermocouple and low-level voltage signal types.
The TCA-4 can be used with 4-20mA process control signals too.
A burden resistor is used to convert the 4-20mA current into a voltage, and the amplifier offset control is used to trim out the static 4mA voltage component.
Hence it is possible to convert the 4-20mA signal to a zero to full scale voltage signal.
The TCA-4 can be powered from a single 5V supply or a 9-28V supply.
An onboard DC/DC convertor provides a +/-15V supply to the amplifiers, giving a usable amplifier output range of over +/-13V.
The TCA-4 is reverse-polarity and overvoltage protected in case of power supply or wiring errors.
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