Samson Valve Positioner 3730-0

Samson Valve Positioner 3730-0, brand new, genuine product, model number 3730-01000000000000000.04. The Samson 3730-0 electric valve positioner is an important accessory for pneumatic control valves. It is mounted on the pneumatic control valve and used to accurately position the valve according to the input control signal.

The DC input control signal from the control system or controller is used as the setpoint w, the valve position as the adjusted parameter and feedback quantity x.

The valve positioner compares these two and then outputs a signal y to the pneumatic actuator to adjust the valve position according to a certain rule. The required air supply pressure is between 1.4 and 6 bar.

The current input signal as a reference variable should be between 4 and 20 mA. The positioner can be directly mounted on a 3277 actuator or mounted on a corresponding actuator conforming to IEC60534-6 (NAMUR) standard. Each method has corresponding mounting hardware.

The Samson 3730-0 positioner mainly consists of a valve position sensor (valve position-resistance linear converter), an analog-to-electric converter, a pneumatic amplifier, and an analog controller. The pneumatic control valve position x is converted into an electrical signal by the feedback rod and the valve position sensor

• and transmitted to the analog PD controller
• . the input signal. One external air source supplies the pneumatic amplifier
• , and the other is adjusted by the pressure setter
• to a working air source suitable for the electric converter
• . An overpressure and flow setter
• is installed on the output air path of the pneumatic amplifier, which can be used for purging the pneumatic amplifier air path, with a fixed set point and a certain amount of exhaust, to ensure the normal operation of the pneumatic amplifier. limited by using DIP switch S5. Output air volume adjustment
• and switch S6 are used to adapt the positioner to actuators of different sizes and change the gain to optimize the positioner. (adjustable): Direct mounting to 3277 type actuator: 5.3 to 30mm Connection according to IEC 60534-6 standard: 5.3 to 200mm Stroke range: Adjustable within the rated stroke range, the maximum adjustable stroke ratio is 1:5 Reference variable w: Signal range: 4 to 20mA;
• Split range: 4 to 12mA / 12 to 20mA;
• selectable by DIP switch. Two-wire system with reverse protection, static damage limit 100mA. Minimum current: >3.6mA Load impedance: Non-explosion-proof type: ≤6V (equivalent to 20 mA at 300Ω). Explosion-proof type: ≤6V Gas supply: Supply pressure: 1.4 to 7 bar (20 to 105 psi). Air quality (according to ISO 8573-1): Maximum particle size and density: Class 4 Oil content: Class 3, Dew point: Class 3 or at least 10K below ambient temperature Output signal pressure: 0 bar to maximum gas supply pressure, limited to approximately 2.4 bar via DIP switch. Characteristics: Linear;
• Basic deviation ≤1%;
• Hysteresis: ≤1%;
• Sensitivity: ≤0.1%;
• Direction of action: Selectable air consumption via DIP switch;
• Static: independent of air source pressure, approximately 120 ln/h;
• Permissible ambient temperature: -20 to +80℃, -45 to 80℃ with metal cable seal;
• Protection rating: IP66;
• Housing material: Die-cast aluminum EN AC-AL Si12(Fe) (EN AC-44300) according to DIN 1725 standard, chrome plated and painted;
• External parts: Stainless steel 1.4571 and 1.4301. Our company offers Samson valve positioners 3730-0, directly sourced from the manufacturer, brand new and genuine. For product details, please contact our sales department.

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