Safety Devices to DIN12876
- Low-liquid level protection
- Adjustable over-temperature protection
Table 2 – Classification of laboratory circulators and laboratory baths
Class
designation
Heat transfer
liquid
Technical requirement Marking
d
I non-flammable
a
overheating protection
c
NFL
II adjustable overheating protection
flammable
b
FL
III
adjustable over-temperature
protection and additional low-liquid
level protection
a
Usually water; other liquids only if they are non-flammable within the temperature range
in single fault condition
b
Bath liquids shall have a flash point ≥ 65 °C, this means if ethanol is used, only
supervised operation is possible.
c
Overheating protection can be by using for example a suitable liquid level sensor or
a suitable temperature limiting device.
d
Optional at the manufacturer`s discretion.
Your temperature control unit is designated a Class III FL.
The type and function of the over-temperature protection and low-level protection is
dependent on the temperature control unit.
Monitoring of the over-temperature is the same for all CC-Thermostats. As, there are
models with two sensors and models with only one sensor.
Two diferent types of low-level protection are available (depending on the model):
1. Temperature control machines with classical float (e.g. ministats)
2. Temperature control machines with an electronic low-level protection (e.g. K6-
cc-NR)
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