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The TC 225 Temperature Controller provides a pair of up and down settings to set individual target temperature for the two cuvettes. Two buttons are provides to turn temperature control on or off for each cuvette, and a single knob sets the same variable speed in both cuvettes.
Temperatures for each cuvette holder may be independently controlled from -55 °C to + 105 °C, although special provision must be made to work below about -10 °C (see ). While the temperature of the cuvette holder changes rapidly, the actual temperature in the sample lags behind the temperature of the sample holder. To measure the actual sample temperature, a thermistor probe may be plugged into the back of the controller and inserted into the sample. The TC 125 accepts standard Series 400 or 500 thermistor probes available from a number of manufacturers. We prefer the model 423 or model 555 from Yellow Springs Instrument Company. The 423 is 1/8-inch diameter and can be used in a 10 mm square cuvette, whereas the 555 is only 0.030 inches in diameter and may be used in microcuvette or in short path length cuvettes.
The TC 225 has a USB connector on its back panel and may accept instructions from a computer. Please see the description of the , for more information about remote control.
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TC 225™
