FTS Systems FC100A01. A mechanically refrigerated immersion cooler enables directed cooling via a probe. A wide range of compatible probes are available for various industrial and laboratory applications. Direct expansion of refrigerant in probe creates temperatures of -50Â°C or -100Â°C at the probe. Temperatures to -50Â°C in 30 minutes or to -80Â°C in 50 minutes (2 L bath). Heat Removal: Up to 750 BTU (configuration and temperature dependent). Features RS232 interface for external control and PID control with external sensor. Temperature: Ambient to -100Â°C. Temperature Control Stability: Â± 0.5Â°C. Dimensions (Approx): 20â€ D x 10â€ H x 18.5 W.