Foxboro Eckardt SRI986-BIDS7EBBNA - Image 1

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Foxboro Eckardt SRI986-BIDS7EBBNA

Product Introduction: The SRI986 is a microprocessor-based, two-wire electro-pneumatic positioner for mounting on pneumatic linear or rotary actuators. It converts a 4–20 mA control signal into a pneumatic output, with auto-calibration, split-range capability, and optional analog position feedback (BIDS7E… variants include 4–20 mA feedback; ZZZ variants omit extra options).

Category: FOBORO

Description

Technical Specifications:

Input Signal: 4–20 mA DC (two-wire loop powered), also accepts 0–20 mA or 2–10 V on request
Input Impedance: ≈200–300 Ω
Supply Air Pressure: 1.4–6 bar (20–90 psig); filtered and regulated air recommended per ISO 8573-1
Output Action: Single-acting (B = single-acting, D = double-acting; these codes are single-acting)
Stroke Range: Linear 8–260 mm (standard linkage); angular 30–120°
Position Feedback (BIDS7E…): 4–20 mA DC isolated output; (ZZZ) = no feedback / standard config
Accuracy: ≤ ±0.5% FS; hysteresis ≤ 0.3% FS; repeatability ≤ ±0.2% FS
Response Time: < 1 s typical (depends on actuator volume)
Explosion Protection: Ex ia IIC T6 / T5 (ATEX II 2G), FM, CSA Intrinsic Safety; some variants Flameproof (Ex d)
Mounting: NAMUR VDI/VDE 3845 / IEC 60534-6standard; 120° rotary adapter available
Ambient Temp: −40 to +80 °C
Housing Material: Die-cast aluminum, epoxy painted; stainless steel hardware
Ingress Protection: IP65 (E-suffix variants); IP54 standard
Weight: approx. 1.8 kg

Features & Working Principle:

Microprocessor compares setpoint (4–20 mA) with actual valve stem position sensed by Hall-effect or conductive plastic sensor; PID-type I/P converter modulates pilot valve to minimize error.
Zero and span independently adjustable via local pushbuttons or infrared handheld communicator; auto-calibrate function.
Split-range (3-way) and characterization (linear, equal %, custom cam) supported.

Applications: Oil & gas upstream/downstream, petrochemical plants, power generation (boiler feedwater, steam dump), pulp & paper, pharmaceutical batch reactors.

Installation & Notes:

Mount on actuator per NAMUR orientation; verify feedback linkage does not exceed sensor travel limits.
Always install a 5-micron air filter regulator upstream. Perform auto-calibration after mechanical installation.
For intrinsic safety loops, confirm zener barriers / IS interfaces are correctly specified.

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