Product Description; Construction; Function; Gemü 1250 Function - GEM 125 Series Operating Instructions Manual

4 Product description

4.1 Construction

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Fig. 1: Main components of limit switch
Item
1 Limit switch
2 Plug
3 Locking screw

4.2 Function

Fig. 2: Limit switch operating principle
The float, which is equipped with a permanent magnet, in the
flowmeter is pushed past the limit switch by the flow. This
magnetically trips the reed contact in the limit switch.
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4.2.1 GEMÜ 1250 function
Fig. 3: GEMÜ 1250 operating principle
The GEMÜ 1250 limit switch is equipped with a built-in
bistable change-over contact with two switch positions. The
limit switch changes to the "Maximum" switch position (posi-
tion B) when the float, which is equipped with a permanent
magnet, passes upwards past the limit switch. The limit
switch changes to the "Minimum" switch position (position A)
when the float, which is equipped with a permanent magnet,
passes downwards past the limit switch.
4.2.2 GEMÜ 1251/1256 function
Fig. 4: GEMÜ 1251/1256 operating principle
The GEMÜ 1251/1256 limit switches are both equipped with a
bistable reed contact and are signal generators for the max-
imum value. The contact is closed when the float, which is
equipped with a permanent magnet, passes upwards past the
limit switch (position A). The contact is opened when the
float, which is equipped with a permanent magnet, passes
downwards past the limit switch (position B). The status of
the limit switch is retained until the float passes by again.
4.2.3 GEMÜ 1252/1257 function
Fig. 5: GEMÜ 1252/1257 operating principle
4 Product description
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GEMÜ 125x