Description
8200 series Electro-Pneumatic Valve Positioner
Product Introduction
The 8200 series electro-pneumatic valve positioner is a product introduced from Masoneilan in the United States, a new product launched in the 1990s. It is mainly used to improve the linearity of control valves, accelerate valve action speed, overcome the unbalanced force of the control valve core, and achieve split-range control. Its features are as follows:
Compact structure, lightweight, explosion-proof components consist of a torque motor and junction box.
Easy to maintain due to standardized structural parts. All screws are made of stainless steel.
Easy to adjust zero position and stroke.
The positioner can be mounted on the actuator from the back or side.
Easy to switch from automatic to manual operation.
Structural Principle
Structure: The positioner consists of a torque motor, armature, spring, zero-adjustment spring, nozzle baffle, amplifier, automatic/manual switching mechanism, feedback spring, feedback rod, etc.
Principle: When a signal current is input to the torque motor, the armature rotates clockwise around the spring. The baffle moves closer to the nozzle, increasing the pressure in the nozzle back pressure chamber. The diaphragm pushes the pilot valve, converting the air source pressure into output pressure, which then enters the actuator. The actuator's push rod moves downward, driving the feedback rod and feedback spring. When the force generated by the torque motor balances the pulling force of the feedback spring, a specific signal current corresponds to a specific push rod position.
Technical Parameters
Input Impedance: 250Ω±25Ω
Air Source Pressure: 0.14～0.7MPa
Explosion-proof Type: Flameproof (dⅡBT4), Intrinsically Safe (iaⅡCT4)
Basic Error: ±1.0%FS (±2.5%FS for cam type), FS is the full-range value (±2.5%FS for cam type)
Hysteresis: 1.0%FS (lever type), 1.5% (cam type)
Dead Zone: 0.2%FS
Air Consumption: 500L/h (at a standard air source pressure of 0.14MPa)
Product Introduction
The 8200 series electro-pneumatic valve positioner is a product introduced from Masoneilan in the United States, a new product launched in the 1990s. It is mainly used to improve the linearity of control valves, accelerate valve action speed, overcome the unbalanced force of the control valve core, and achieve split-range control. Its features are as follows:
Compact structure, lightweight, explosion-proof components consist of a torque motor and junction box.
Easy to maintain due to standardized structural parts. All screws are made of stainless steel.
Easy to adjust zero position and stroke.
The positioner can be mounted on the actuator from the back or side.
Easy to switch from automatic to manual operation.
Structural Principle
Structure: The positioner consists of a torque motor, armature, spring, zero-adjustment spring, nozzle baffle, amplifier, automatic/manual switching mechanism, feedback spring, feedback rod, etc.
Principle: When a signal current is input to the torque motor, the armature rotates clockwise around the spring. The baffle moves closer to the nozzle, increasing the pressure in the nozzle back pressure chamber. The diaphragm pushes the pilot valve, converting the air source pressure into output pressure, which then enters the actuator. The actuator's push rod moves downward, driving the feedback rod and feedback spring. When the force generated by the torque motor balances the pulling force of the feedback spring, a specific signal current corresponds to a specific push rod position.
Technical Parameters
Input Impedance: 250Ω±25Ω
Air Source Pressure: 0.14～0.7MPa
Explosion-proof Type: Flameproof (dⅡBT4), Intrinsically Safe (iaⅡCT4)
Basic Error: ±1.0%FS (±2.5%FS for cam type), FS is the full-range value (±2.5%FS for cam type)
Hysteresis: 1.0%FS (lever type), 1.5% (cam type)
Dead Zone: 0.2%FS
Air Consumption: 500L/h (at a standard air source pressure of 0.14MPa)