Eckardt SRI986 Intelligent Valve Positioner

Eckardt SRI986 Intelligent Valve Positioner

Eckardt SRI986 is an intelligent electrical valve positioner launched by the Eckardt brand under Emerson. It is designed specifically for pneumatic actuators in industrial process control and achieves high-precision adjustment of valve opening through precise electrical pneumatic signal conversion and closed-loop control. This product integrates non-contact position detection, modular structure, and intelligent diagnostic functions, and is compatible with industrial communication protocols such as HART and PROFIBUS PA. It is widely used in industries such as petrochemicals, power, water treatment, and pharmaceuticals, and is suitable for both linear and rotary pneumatic actuators. Its core advantages lie in high adjustment accuracy, low maintenance requirements, and strong environmental adaptability.

Core positioning and technological advantages of the product

1. Core functions and applicable scenarios

High precision positioning control: using non-contact Hall effect position sensors, the adjustment accuracy reaches ± 0.5% of the full range (Span), and the repeatability accuracy is ± 0.1%. It is suitable for scenarios that require strict flow/pressure control, such as chemical reactor feed valves and power plant steam control valves.

Intelligent diagnosis and communication: Supports HART 7.0 (standard) and PROFIBUS PA (optional) protocols, and can remotely read valve operation data (such as opening, gas supply pressure, fault codes) through a handheld device (such as Rosemount 475) or control system to achieve predictive maintenance.

Wide range adaptation: compatible with single acting (Spring Return) and double acting (Double Acting) pneumatic actuators, with a gas source pressure range of 0.2-1.0 MPa (2-10 bar), and output force/torque covering multiple actuator specifications (maximum linear thrust of 40 kN, maximum angular torque of 500 N · m).

Environmental tolerance: Protection level IP66/IP67 (standard), IP68 (optional), temperature range -40~+85 ℃ (conventional), -55~+100 ℃ (high temperature option), certified by ATEX, IECEx, CSA and other explosion-proof certifications, can be used in Zone 1/2 (Class I hazardous areas) and corrosive environments (optional corrosion-resistant coating).

2. Key technological highlights

Non contact position detection: Abandoning traditional mechanical linkage detection, adopting Hall sensor+magnetic ring structure, no mechanical wear, with a lifespan of over 1 million cycles, reducing maintenance frequency.

Adaptive control algorithm: Built in "Auto Tune" function, automatically recognizes the characteristics of the actuator (such as stroke and response speed) after power on, optimizes PID control parameters, eliminates the need for manual debugging, and shortens installation time.

Modular design: divided into control unit (electronic module), pneumatic module (solenoid valve+air circuit) and connecting components, each module is independently disassembled and can be replaced separately in case of failure, reducing maintenance costs and downtime.

Hardware structure and technical specifications

1. Core components and functions

Component Category Key Component Function Description

Electronic control unit Hall position sensor, microprocessor, communication chip 1. Receive 4-20mA/HART/PROFIBUS PA input signals;

2. Check the actual position of the valve (resolution 0.01% of full range);

3. Execute PID control algorithm and output control signal to pneumatic module;

4. Store operational data and diagnostic information, and support remote communication.

Pneumatic module piezoelectric valve, pressure sensor, pneumatic block 1. Convert electronic signals into pneumatic signals (output pressure 0.2-1.0 MPa);

2. Single acting mechanism: controls the "on/off" side pressure (spring reset);

3. Double acting mechanism: independently controls the pressure on both sides of "on" and "off";

4. Built in pressure sensor, real-time monitoring of gas supply and output pressure.

Connecting and installing component brackets, connecting shafts, explosion-proof enclosures. 1. The bracket is compatible with straight stroke (ISO 5211 standard flange) and angular stroke (shaft diameter 10-30mm) actuators;

2. The connecting shaft supports ± 5 ° angle deviation compensation, simplifying installation alignment requirements;

3. The shell is made of aluminum alloy (conventional) or stainless steel (corrosion-resistant option), with an explosion-proof rating of Ex d IIC T6 (ATEX).

2. Key technical parameters

(1) Control performance

Parameter linear actuator angular actuator

Travel range 2-100 mm (standard), 100-300 mm (extended), 0-90 ° (standard), 0-180 °/0-360 ° (optional)

Adjustment accuracy ± 0.5% full range ± 0.5% full range

Response time ≤ 0.3 seconds (step signal 10% -90%) ≤ 0.5 seconds (step signal 10% -90%)

Dead zone ≤ 0.1% of full range (adjustable through software) ≤ 0.1% of full range

(2) Electrical and Pneumatic Parameters

Input signal:

Standard: 4-20 mA DC (load resistance 250-600 Ω)+HART 7.0;

Optional: PROFIBUS PA (IEC 61158-2, transmission rate 31.25 kbps).

Power requirements: