Samson 2439, Монтаж и эксплуатация

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12 EB 2185 EN
Design and principle of operation
3 Design and principle of oper-
ation
See Fig. 2.
The safety temperature limiter limits the tem-
perature by closing and locking a valve con-
nected to the thermostat. The safety tempera-
ture limiter works according to the adsorp-
tion principle (gas expansion). The tempera-
ture sensor (12), capillary tube (10) and op-
erating element (8) of the set point adjuster
are filled with an expansion gas.
The temperature-dependent change in vol-
ume of the gas in the bulb sensor (12) caus-
es the piston in the operating element (8) of
the set point adjuster to move. As a result,
the pin of the operating element moves the
plug stem (4) with the plug (3).
The temperature limit can be adjusted by
turning the set point adjuster (8). This limit
value is indicated on the scale (11).
The valve is locked by a spring mechanism
when the temperature reaches the adjustable
limit, when the capillary tube ruptures or
there is a leak in the sensor system.
The device can only be reset and put back
into operation when the fault has been reme-
died and the temperature has fallen below
the limit (approx. 15 K below the adjusted
temperature limit).
Fail-safe position
The spring mechanism in the operating ele-
ment is released when the capillary tube
breaks or when there is a leak in the sensor.
It moves the plug stem (4) with the plug (3)
over the pin of the operating element and
closes and locks the valve. It is not possible
to unlock the valve if the capillary tube has
ruptured or there is a leak in the sensor sys-
tem.
The adjusted limit temperature must have a
minimum temperature difference of 15 K to
the set point of the temperature regulator.
Note