14
EB 5866 EN
Design and principle of operation
3.2 Versions
Intermediate insulating piece
An intermediate insulating piece is available
for insulated pipes.
Electric actuators
The electric actuators can be controlled ei-
ther using a three-step signal or, in the ver-
sion with positioner, with continuous signals
adjustable in the range from 0 to 20 mA or
from 0 to 10 V. Various electrical accessories
can be optionally installed.
Type 5825 Actuator is able to perform a fail-
safe action. Refer to Table 1.
Electric actuators with process controllers
Electric actuators with process controllers are
a combination of an electric actuator and a
digital process controller. The TROVIS 5757-
3, TROVIS 5724-3, and TROVIS 5725-3
Electric Actuators with Process Controller are
suitable for domestic hot water heating.
TROVIS 5757-7 and TROVIS 5725-7 are
suitable for heating and cooling applica-
tions.
TROVIS 5724-8 and TROVIS 5725-8 have
two PID control modules and are ready-
wired for heating and cooling applications.
TROVIS 5725-3, TROVIS 5725-7, and
TROVIS 5725-8 Actuators are able to per-
form a fail-safe action (see Table 1).
Pneumatic actuators
The Type 2780-1 Pneumatic Actuator uses a
control signal from 0.4 to 1 bar and
Type 2780-2 uses a control signal from 0.4
to 2 bar which is applied to the signal pres-
sure connection.
The pneumatic actuators require a supply
pressure of at least 0.2 bar above the maxi-
mum bench range. All actuators are avail-
able for fail-safe action "Actuator stem ex-
tends (FA)" or "Actuator stem retracts (FE)".
Summary of Contents for 3222/5857 series
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