Air Temperature Control Unit (ATCU) Overview 

Praecis offers air temperature control units (ATCU) accommodating a range of enclosure sizes and conditions.

All Præcis ATCU systems provide:

• Praecis’ proprietary actuation and multi-loop control implementation strategy to control the temperature at the user-selected critical point, while maintaining high bandwidth and excellent disturbance rejection.

• Critical point temperature stability to 0.004 p-v (± 0.002) °C.

• Long-term temperature stability without operator intervention.

As an alternative to compressor-based systems., Praecis has introduced Praecis-SS ATCUs, solid state (thermo-electric) systems The Praecis SS series relies on Peltier cells as sources of hot and cold air, thereby replacing the conventional compressor-based heat pumps.

solid-state Air temperature control.

The Praecis ATCU Solid State (SS) units offer the following benefits:

• The Praecis ATCU Solid State (SS) units offer the same or better temperature control than the Praecis compressor-based systems. Lack of internal disturbances making +/- 0.002 °C stability at the critical point a reasonable expectation when installed in an appropriate environment (+/- 0.5 °C) with no rapid disturbances.

• Long MTBF (mean time between failure). The life expectancy of the solid state Peltier cells is close to infinite, and the fans are the only electro-mechanical components in the system and have a mean life expectancy of 70,000 continuous hours (eight years) at full power.

• Reduced noise (less than 61 dB), equivalent to normal conversation.

• Non-polluting, no liquid or gaseous hazardous waste.

Cooling Using Refrigerant:
Praecis Air temperature control

Praecis’ original ATCU’s use liquid refrigerant and compressed air as the basis of temperature control. Praecis offers the following four models: