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Stirred Liquid Baths
-80 to 300°C
g
Four Models, -80°C to 300°C
g
Stability 0.01°C
g
Excellent Uniformity
Precision calibration of thermometers calls for the use of
stirred liquid calibration baths. The Hydra models set new
standards in terms of price to performance ratio. Now
Calibration Engineers and Metrologists can choose from
a range of baths that offer good immersion depth, parallel
tube action, giving the best uniformity and smallest
calibration uncertainties, and wide temperature ranges.
Hydra offers these features in a new price class, don’t
settle for a bath with shallow immersion or simple stirred
action when with these Isotech baths provide good depth
of immersion and good temperature uniformity along with
the other benefits Isotech baths offer.
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.
Hydra 798
Hydra benefits from Isotech’s experience, it drains faster,
is easier to use, is safer, and is more convenient.
Accessories allow a wide range of thermometers, for
example, to be readily clamped by the Sensor Support
and ITS-90 fixed points cells are accommodated with the
adjustable cell holder.
g
Parallel Tube Action...
Liquid flows up the rear volume of the
bath and down the working volume.
This action creates very small vertical
and axial gradients. This gives the
smallest overall uncertainties.
g
Heating...
All heating is outside the container. By
using a large area nickel foil heater the
complete bath wall is heated uniformly.
g
Fast Cool Down...
The Hydra cools from ambient to
-80°C in just 180 minutes.
g
Cooling...
The cooling is built-in and also
surrounds the calibration volume
creating a low temperature ambient in
which the heater can function
efficiently.
g
Wider Temperature Range...
A unique cooling system cools the
unit as well as enabling the bath to
heat up to 125°C (121°C is a key
sterilization temperature).
g
Commercial Grade Chillers...
The chillers are one third horse power
commercial grade units, not cheaper
domestic grade as used by some
manufacturers.
g
Calibration Depth...
Double the depth of some baths. The
Hydra Range has up to 300mm depth
of immersion.
g
Circular Design...
The circular design eliminates ‘cold
corners’ found in tank shaped
calibration baths.
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SOLUTIONS FOR PRIMARY & SECONDARY LABORATORIES
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SET / RESET POWERCONTROLLEROVER-TEMPERATURESET / RESET POWERCONTROLLEROVER-TEMPERATURESET / RESET POWERCONTROLLEROVER-TEMPERATURESET / RESET POWERCONTROLLEROVER-TEMPERATURESET / RESET POWERCONTROLLEROVER-TEMPERATURESET / RESET POWERCONTROLLEROVER-TEMPERATURESET / RESET POWERCONTROLLEROVER-TEMPERATURESET / RESET POWERCONTROLLEROVER-TEMPERATURESET / RESET POWERCONTROLLEROVER-TEMPERATURESET / RESET POWERCONTROLLEROVER-TEMPERATURESET / RESET POWERCONTROLLEROVER-TEMPERATURE
SET / RESET POWER CONTROLLER OVER-TEMPERATURE
Calibration
Volume
Drain
Overflow
Cooling
(798H and
798EHT only)
Temperature
Controller
Over
Temperature
Controller
Power
Set / Reset
Model 798L 798M 798H 798EHT
Temp Range -80°C – 125°C -40°C – 125°C 30°C – 200°C 30°C – 300°C
Volume 150mm Diameter, 300mm Deep (5 litres)
Absolute Stability ±0.030°C ±0.017°C ±0.015°C ±0.015°C
(Methanol, -80°C) (Methanol, -40°C) (Oil, 125°C) (Oil, 250°C)
Vertical Uniformity ±0.002°C ±0.002°C ±0.002°C ±0.005°C
(Oil, 50°C) (Oil, 50°C) (Oil, 125°C) (Oil, 200°C)
Heating time 25°C to 200°C < 60 minutes (C10 Oil)
Cooling time Ambient to -80°C < 130minutes (Methanol)
Communications Includes Serial Interface, PC Cable and Software
Dimensions 405mm Wide, 610mm Deep, 940mm High (870mm to Top Panel)
Weight 59kg 46kg 33kg 33kg
Safety Compliant to CE Regulations
Power 2.5kW 1.5kW 800W 800W
110V 50/60Hz or 110V 50/60Hz or 110V 50/60Hz or 110V 50/60Hz or
230V 50/60Hz 230V 50/60Hz 230V 50/60Hz 230V 50/60Hz
How to Order 798L 798M 798H 798EHT
Refer to Evaluation Report for Full Details
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Accesories - Refer to ‘Liquid Selection Guide’ on page 73 for information on liquids and important Health and Safety Information
Lid Liquid Volume Lid
Included
Equalizing BlockAluminium Equalizing
Block, 4 pockets,
8mm diameter,
160mm deep
Sensor Holder Thermometer
Support Kit
Holds up to 12 sensors
between 3mm diameter
and 8mm diameter
Dual Cell Holder Standard Dual
Cell Holder
Includes
interchangeable
Cell adaptors
Fixed Point Cells
Mercury
Triple Point Cell
-38.8344°C
Water
Triple Point Cell
0.01°C
Gallium
Melt Point Cell
29.7646°C
Indium
Freeze Point Cell
156.5985°C
Slim Gallium
Melt Point Cell
29.7646°C
Copper Equalizing
Block, 4 pockets,
8mm diameter,
160mm deep
Special Aluminium
Equalizing Block
To suit customer
requirements.
798-05-01
798-05-02A
798-05-04
798-05-03
17724
B12
17401
17668ML
17401M
798-05-02B
798-05-02C
798-05-02D Special Copper
Equalizing Block
To suit customer
requirements.
125°C
100°C
75°C
50°C
0°C
25°C
-25°C
-50°C
-75°C
-100°C
0
TIME (minutes)
TEMPERATURE (°C)
Cool Down Graph
30 60 90 120 150 180
125°C
100°C
75°C
50°C
0°C
25°C
-25°C
-50°C
-75°C
-100°C
0
TIME (minutes)
TEMPERATURE (°C)
Heat Up Graph
20 40 60 80 100 120
150mm
100mm
Calibration
Area
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