positioner is a loop powered instrument. As a control part of the pneumatic valve set, this positioner is widely used in petroleum, chemical, electric generation, metal production, light industry and other fields of automation systems.
The maxsti intelligent electro-pneumatic valve positioner accepts 4-20 mA valve setting signal from the control system; at the same time, it receives the actual valve signal through the local sensors; the two signals are compared by control software in order to control the feeding and exhaust of the air to the actuator, driving the valve to reach the set point.
sti positioner is based on microprocessor technology. It can overcome friction and the imbalance power on the control valve well, and improve the response speed of the control valve. This sets the position rapidly and accurately.
Autotuning system for calibration
Auto-diagnosis system
Compact design
Display for calibration
Heavy duty design
High reliability
Integrated fail in place on loss of signal device
Integrated position transmitter
TECHNICAL DATA
Input Signal
4-20 mA
Signal Standard operating temperature
-20¡ãC to 70¡ãC
CV max low flow
ND 1/4¡± Inlet = 0.12 ; ND 1/4¡± Outlet = 0.12
Air consumption
0.036 Nm3/h (0.02 SCFM) at 400kPa (60 psi)
Feeding connection
ND 1/4¡±
Electrical connection
ND 1/2¡± NPTF
Supply pressure
1.4¡Â7 bar
Hysteresis
0.2% of full stroke
Accuracy
0.5% of the full stroke
Sensitivity
0.1% of signal range
Accessories available
Remote mounting
