The Isotech Model 18233 Water Triple Point Maintenance Bath is not an adaptation of general-purpose commercial equipment, but is specifically designed to maintain and safeguard 1 to 4 Water Triple Point Cells, for the calibration of thermometers on the International Temperature Scale of 1990.
It will maintain the water triple point for long periods of time (many months, with occasional attention) so that this fundamental fixed point of thermometry is continuously available.
It will ensure the integrity of the cells against catastrophic freezing, which can break the glass envelope.
1. The case of the bath is made of special-quality double-skinned laminated wood for best thermal resistance and stability.
2. Cooling is accomplished by efficient solid-state Peltier chilling modules, powered so that the rate of temperature change is very small.
3. Two safety circuits are provided to prevent cell breakage by excessive ice formation. The controls can be set to a resolution of better than 0.001°C. If control fails in such a mode that the Peltier chillers are full on, a warning light is lit to give the operator 20 minutes in which to take appropriate action. If no action is taken, the apparatus is automatically switched off and the cells are allowed to warm slowly.
4. Passive safety is provided by the physics of ice. If the Peltier chillers become too cold, the first ice which forms is on the water tank surfaces directly in contact with the chillers, effectively inhibiting further rapid transfer of freezing to the bath water.
5. A specific stirring rate of bath fluid is provided by bubble agitation which prevents the water from stratifying.
6. The bath is manufactured to the strict requirements of BS 5750 and ISO 9000. Each finished bath becomes part of the Isotech UKAS working calibration Laboratory for two weeks or more, during which use the control and alarm circuits are set and checked for optimum performance. It is released only when Isotech is entirely satisfied with its performance.
The bath has a long and successful history and is relied on by many National Laboratories throughout the world. This history of successful use is one of the most important reasons for choosing Isothermals' products.
7. Recent design changes mean that the bath will work in higher ambient temperatures and, if a chiller module fails, it can be replaced easily.
ITL-M-18233 WTP Bath Product Spec Sheet
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