K61 Series stirred liquid metrology baths
The K61 Series is a modular platform of stirred liquid calibration baths designed to deliver precise, repeatable temperature calibrations across a wide operating range. Multiple configurations are available to optimize performance for specific calibration workloads, while maintaining a common control architecture, user interface, and fluid-based metrology approach.
Wide Temperature Coverage
Configurations available from −80 °C to +300 °C, including low-, mid-, and high-temperature systems, as well as a dual-well wide-range configuration.
High Stability and Uniformity
Actively stirred liquid environment with continuous circulation minimizes spatial gradients and supports high stability over defined measurement intervals.
Precision PRT-Based Control
24-bit AC-excited, ratiometric measurement system using platinum resistance thermometers for accurate and stable control.
Configurable System Architecture
Available as K61L, K61M, K61H, and K61 Wide Range, with optional deep-well (“D”) variants for increased immersion depth.
Low Maintenance, High Reliability
Seal-less stirring system and integrated fluid management features reduce maintenance and support long-term operation.
Automation-Ready Operation
Optional remote interfaces enable integration into automated calibration systems, increasing throughput and reducing operator involvement.
Key Features
(see numbered callouts in image)
1. Well Opening 2.6″ (65 mm)
Provides ample working diameter to accommodate a wide range of probes and sensors, including liquid-in-glass thermometers.
Coaxial Counter-Flow Design
Thermally conditioned fluid circulates upward through the inner work zone and returns through an annular channel, providing continuous mixing and supporting stability better than ±0.003 °C over 30 minutes.
3. Bottom-Stirring Wet Rotor Impeller
Integrated brushless DC motor with wet rotor design eliminates dynamic shaft seals while providing excellent axial and radial uniformity (better than ±0.005 °C).
User-Controlled Motor Speed
Adjustable stirring speed allows optimization of flow conditions for different fluids, loads, and calibration requirements.
Integrated Expansion Volume
Accommodates fluid expansion and contraction across operating temperatures, reducing overflow risk and minimizing user intervention.
Elevated Fluid Level Above Work Surface
Bath fluid level is maintained above the cabinet top, enabling convenient calibration of liquid-in-glass thermometers and other immersion devices.