Hardware Overview > Sensors and Probes > CCA-S-20X & CCA-S-20X-SET > Temperature transients and gas flow rates

The CCA-S-20X sensor employs a pyroelectric detector, the output from which can be disrupted by sudden changes in temperature. If there is an excessive change in the ambient temperature, gas sample temperature or flow rate, then the output signal will be momentarily frozen. Correct operation is restored when the effects of the transient have settled. Rates of change in the ambient temperature should be restricted to 2 °C/minute and gas flow rates kept below 600 cc/minute.