Memmert SLM 400, Operating Instructions Manual

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UM 200-800/SM 200-400, ULM/SLM 400-800 

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7  Safety devices  

The oven can be equipped with an adjustable overheat controller (TWW), class 3.1 or 
adjustable temperature limiter (TWB), class 2. Both work independently of the 
temperature control system according to DIN 12880. By different adjustments, those 
safety devices can have two different functions: 

Protection of oven and environment and additionally 

Protection of the load from excessive temperature 

The safety devices should be checked at regular intervals, e.g. once a month, once the 
oven has stabilised at the desired temperature. To perform this safety check, reduce the 
setting of the safety device until the red control light at the main switch module turns on. 
After that, the safety device can be set again.

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150°C

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Notice: 

During operation the safety device has to be set 
sufficiently higher than the maximum working 
temperature or at the maximum temperature of 
the oven.

 
7.1  Adjustable overheat controller (TWW), class 3.1 according to DIN 12880 

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Protection of oven and environment: 

Turn the adjustable overheat controller e.g. by 
 use of a coin to upper temperature limit. 

Protection of load:

First turn adjustable overheat controller to upper 
 limit. 

After the oven has stabilised, the setting of the 

 overheat controller should be moved down until 
 it  operates.

The red signal lamp in the main 
switch module turns on.

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Upper 
temperature 
limit:

Protection of 
oven and 
environment

Set close to 
the switching 
point: 

Protection of 
the load

Now turn back the overheat controller to nearly 

one digit higher.

Maximum temperature rating of oven 

220°C 

one scale line means approx.

15°C

safety temperature

working 
temperature