Description; Application; Principle Of Operation - Samson 6000 Series Mounting And Operating Instructions

Description

2 Description

2.1 Application

The devices are used to convert a direct cur-
rent input signal into a pneumatic output sig-
nal for measuring and control tasks. They
are particularly suitable as intermediate ele-
ment between electric measuring devices
and pneumatic controllers or between elec-
tric control devices and pneumatic control
valves.
The input is a load-dependent direct current
from 0/4 to 20 mA or a DC voltage signal
from 0/2 to 10 V with an auxiliary power of
24 V DC. The output is, for example, a
pneumatic signal of 0.2 to 1 bar (3 to
15 psi) or 0.4 to 2 bar (6 to 30 psi) or spe-
cial ranges up to 5 bar (75 psi).

2.2 Principle of operation

The device consists of an i/p converter module and a downstream volume booster.
When operated, the supplied direct current i flows through the plunger coil (2) located in the
field of a permanent magnet (3). At the balance beam (1), the force of the plunger coil,
which is in proportion to the current, is balanced against the force of the dynamic backpres-
sure. The backpressure is produced on the flapper plate (6) by the air jet leaving the nozzle
(7).
The supply air (SUPPLY 8) flows to the bottom chamber of the volume booster (8). A certain
amount of air determined by the diaphragm position flows past the sleeve (9) and leaves
through the output (OUTPUT 36).
EB 6126 EN 5