Camille Bauer KINAX SR 709 Betriebsanleitung Seite 15

KINAX SR 709
Transmitter for position feedback
Position transmitter with NAMUR valve fitting
Application
The position feedback transmitter KINAX SR 709 (Fig. 1 and 2) is
used to measure and transmit linear displacement (stroke) on various
types of control valves and other control devices. The output is a
load independent DC signal. The position feedback transmitter
consists of a KINAX angle transmitter and a reduction gear which
converts a linear movement into an angle of rotation of
0 ... 90°. Both parts are contained in a robust cast aluminium
housing. The mounting part to the control valve is based on NAMUR
recommendations, (standards working group for measuring and
process control in the chemical industry).
Features / Benefits
● Measuring input: Movement, stroke
Measured variable
Movement, stroke
● Setting of the measuring range is achieved via adjusting the lever
system pivot point. More precise calibration is via zero and span
potentiometers / Optimum adjustment of zero and span can be made
to meet individual requirements
● Measuring output: DC current signal (load-independent, 2, 3 or 4-wire
connection)
● Capacitive scanning system / Non-wearing
● Unit in field type housing in cast aluminium with NAMUR mounting
part for fitting to control valve
●
Available in type of protection «Intrinsic safety» EEx ia IIC T6 / Can
be mounted within the hazardous area (see "Table 3: Data on explosion
protection")
Description
The pick-up of the stroke movement is made by means of a slotted
lever. The adaption to strokes between 10 and 140 mm is made
with an external lever transmission and by an internal gear ratio.
The external lever transmission can be adjusted in such a way, that
Fig. 3. Operating lever set for minimum operating angle
Camille Bauer
Measuring range limits
0 ... 10 to 0 ... 140 mm
Transmitter for position feedback
0102
Fig. 1. Position feedback transmitter KINAX SR 709 showing the operating
lever in the lower zero position, corresponding output current 0/4 mA.
Fig. 2. Position feedback transmitter KINAX SR 709 showing the operating
lever in the upper zero position, corresponding output current 0/4 mA.
the internal cam shaft makes an angle of rotation of approx. 90° for
a full stroke. The measuring range of the built-in angle transmitter
KINAX 3W2 then corresponds with this angular rotation of 90°.
Fig. 4. Operating lever set for maximum operating angle.
KINAX SR 709
II 2 G
1