4.4 Micro calibration bath
ATTENTION! Safety valve!
The transport cover is equipped with a safety valve, which is activated once the
pressure reaches approx. 2.5 bar. This can result in hot steam being released.
Always unscrew the transport cover before putting the micro calibration
bath into service, in order to avoid excessive pressure.
The micro calibration bath is used for calibrating sensors with special shapes or dimensions.
Direct contact between the sensor and the calibration liquid ensures excellent heat transfer.
The magnetic stirrer ensures a uniform temperature distribution in the calibration liquid.
The calibration liquid is poured directly into the tank or into a tub insert.
Tub insert:
We recommend using a tub insert if you:
frequently change between dry block, infrared, surface and micro cali-
bration bath configurations;
frequently work with different calibration liquids.
Use the sleeve changing tool, fit the tub insert in the block.
Just like the tank, the tub insert can be closed with the associated cover. Both
threaded covers are leakproof, so the calibration liquid can be left in the tank
or the tub insert during transport.
4.4.1 Characteristics of the calibration liquids
Different calibration liquids supply varying calibration results due to their specific characteris-
tics. Adjustment to the respective calibration liquid has to be carried out by the manufacturer.
In order to achieve the best possible accuracy of a micro calibration bath, it has to be filled
with a suitable calibration liquid.
We recommend the following calibration liquids for the various temperature ranges:
Calibration liquid
Calibration Range
Ignition Temperature
Distilled water
0°C
95°C
not any
Dow Corning 200 fluid with 5 CS
-40°C 123°C
133°C
Dow Corning 200 fluid with 10 CS
-35°C 155°C
165°C
Dow Corning 200 fluid with 20 CS
7°C 220°C 230°C
Dow Corning 200 fluid with 50 CS
25°C 270°C 280°C
When using water as the calibration liquid:
Only use distilled water, otherwise excessive limescale and soiling will build up in the ca-
librator tank.
