Actual position display can be provided by
digital remote position indicator, which
The position of the valve is indicated
continuously by adjustable discs having
symbols for OPEN and CLOSE. The discs can
be seen through an indicator glass on switch
compartment cover. The open-close discs can
be set to coincide with limit switching. The
mechanical position indicator requires
The position of the valve can be transmitted as
a continuous signal for remote indication. A
potentiometer mounted on RGU is used for
this purpose. A power supply unit provides
necessary voltage to the potentiometer. The
o
potentiometer rotates through 270 for one full
stroke of valve & output signal from
potentiometer is proportional to valve travel.
Thus the actual position of the valve can be
Reduction Gear Unit
Mechanical Position Indicator
Remote Position Indicator
Digital Remote Position Indicator
Position Indicators
Control Equipment
at site, variable ratio RGU is available which
allows simple modification at site depending
upon number of turns of output shaft for full
stroke of valve.
Reduction Gear Unit (RGU)
Mechanical Position Indicator
reduction gear unit for operation.
Remote Position Indicator
Potentiometer
Position
Meter
Power
Supply Unit
Std: 220 ohms, 3W, Linearity + 3%
Optional : 100, 560, 1000 ohms,
3W, Linearity + 3%
Precision : 200, 500, 1000 ohms,
1W, Linearity + 0.5%
PS01, input 220V, 50Hz, output
24V DC
0 - 100% in various sizes
Technical Data
A reduction gear unit (RGU) in the actuator is
used for mechanical position indication,
remote position indication & for operation of
intermediate switches. The output shaft of the
actuator drives final output shaft of RGU
through a series of reduction gears and final
o
shaft turns by approximately 270 while
actuator output shaft performs full number of
turns as set on two train or four train counter
gear unit. The reduction gear ratio needed for
each particular case is fitted at works if the
ratio is known. For this purpose fixed RGU
is supplied. If the ratio needs to be altered
read off continuously on position meter
calibrated & mounted on control panel.
displays open position in percentage.
12
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