Datasheet

SINEAX TI 816
Passive DC Signal Isolator
Camille Bauer Data sheet TI 816-5 Le – 08.07 1
without power supply,
in carrying rail housing
Application
The signal isolator SINEAX TI 816 (Fig. 1) serves to electrically
insulate an analog DC signal in the range 0...20 mA which depen-
ding on version is then converted to a current or voltage signal
(0…20 mA or 0…10 V). It operates passively and does not require
a separate power supply, but derives the little auxiliary energy it
needs from the DC signal.
Its narrow casing is designed for mounting on different types of
standard rails. A number of signal isolators can be mounted im-
mediately next to each other and where there are many DC signals
to be isolated can form a compact isolator block.
Features / Benefits
● Electrically insulated analog DC signals 0…20 mA / Prevents the
transfer of interference voltages and currents. Solves grounding
problems in meshed signal networks
●
Highly accurate / Performs its isolating function with negligible
transmission error
●
No power supply needed / Saves wiring costs and is easy to install
in existing plants
●
The device fulfils the protection requirements of the EMC guidelines
(89/336/EWG) / The device bears the CE symbol for EMC. See “Table 2:
Electromagnetic compatibility”
●
Small and compact / Makes best use of the available space
Fig. 1
Layout and mode of operation
The DC signal isolator comprises a DC chopper Z, an isolating
stage T, a rectifier G and an oscillator O.
The chopper converts the DC input signal E to an AC signal which
is transformed with electrical insulation, rectified, smoothed and
appears at the output as a DC current signal A (Fig. 2, left). Ver-
sions with a DC output voltage signal A have a resistive burden
through which the current flows (Fig. 2, right).
The chopper is controlled by the oscillator which obtains its power
from the DC signal.
O
T G
Z
+
–
+
–
E
A
G
+
–
A
Fig. 2. Schematic diagram.