Isotech 18233 Water Triple Point Maintenance Bath
- Maintains Four WTP Cells
- Solid State Vibration Free Cooling - Quieter Operation
- Lower Energy Consumption / Operating Costs
- Holds up to Four Cells
The Isotech 18233 Water Triple Point Maintenance Bath provides a highly stable and reproducible environment for realizing and maintaining Water Triple Point (WTP) cells. The Water Triple Point, defined at 0.01 °C, is the cornerstone of the ITS‑90 temperature scale and the most important fixed point for calibrating Standard Platinum Resistance Thermometers (SPRTs).
The 18233 is engineered to maintain WTP cells in an isothermal, controlled environment, giving laboratories a dependable reference for daily calibration and verification work.
An optimized environment for WTP cells
The Water Triple Point is extremely sensitive to temperature gradients, pressure variations and external disturbances. The 18233 addresses these challenges with a carefully regulated fluid column, high‑quality insulation and a stable temperature control system. This ensures that the cell remains in a quasi‑isothermal state, enabling sub‑millikelvin uncertainties.
Stable and repeatable performance
The bath provides the conditions necessary for forming and sustaining a clean, stable WTP plateau. Temperature control is precise, vertical gradients are minimal and the design shields the cell from external thermal influences. This makes the 18233 ideal for:
- > daily verification of SPRTs
- > periodic recalibration of reference sensors
- > ISO 17025‑accredited laboratories
- > national and secondary metrology institutes
Ease of use and practical features
Designed for routine operation, the 18233 offers:
- > a stable, low‑convection fluid column
- > easy access to the cell holder
- > a safe, controlled environment for long plateaus
- > compatibility with various WTP cell designs
- > quiet, low‑maintenance operation
Its compact footprint makes it suitable for standard laboratory setups while still delivering performance typically associated with larger, more complex systems.
Traceability and accuracy
When used with a microK thermometry bridge and a high‑quality SPRT, the 18233 enables a fully traceable measurement chain. The bath supports long, stable plateaus, allowing ratio measurements to remain exceptionally steady and uncertainties to be minimized.
The Isotech 18233 Water Triple Point Maintenance Bath offers a remarkably stable, accurate and user‑friendly solution for realizing and maintaining WTP cells. With its excellent thermal uniformity, reliable control and practical design, the 18233 is an essential instrument for laboratories requiring absolute accuracy at 0.01 °C.
