The Isotech Hydra 798 Liquid Bath features good immersion depth, parallel tube action, giving the best uniformity and smallest
calibration uncertainties, and wide temperature ranges.
The immersion depth of 300mm allows the requirements of “Supplementary Information to the ITS-90” to be met. This publication
from BIPM recommends immersion depths of 15 to 20cm from -50°C to 50°C, and from 20 to 27cm at 200°C. Many baths in this price
range are simply not deep enough to meet this requirement. Rather than simply stirring a square tank of liquid the Hydra uses
parallel tube action for superior temperature uniformity. Like other Isotech liquid baths the calibration volume is cylindrical
to suit thermometers, not a large square tank. The bath is filled with just 5 litres of liquid reducing filling and ongoing cost
of ownership as liquids are replenished. The 798H and 798EHT feature a cooling coil which can be attached to an external source
of either cold water or gas to further reduce cool down times.
