Description

Foxboro SRI986-BIDS7ZZZNA Electro-Pneumatic Valve Positioner

Technical Specifications

• Product Model: SRI986-BIDS7ZZZNA
• Brand: Foxboro (Eckardt, Schneider Electric)
• Warranty: One Year
• Input Voltage: 12–36 V DC loop powered
• Operating Temperature: -20°C to +70°C
• Storage Temperature: -40°C to +85°C
• Response Time: ≤200ms full stroke positioning
• Protection Class: IP65 enclosure rating
• Accuracy Class: ±0.5% full stroke span
• Output Frequency: Continuous pneumatic proportional output
• Rated Current Range: 4–20 mA DC analog control input, input resistance ＜200Ω
• Communication Interface: Analog 4-20mA hardwired loop interface
• Supported Protocols: Analog 4-20mA standard process control signal
• Overload Capacity: Stable operation under 6 bar maximum supply air pressure
• Dimensions: 112mm (W) × 130mm (H) × 95mm (D)
• 

Product Overview

The SRI986-BIDS7ZZZNA is a single-acting direct-acting electro-pneumatic valve positioner designed to convert 4–20mA electrical control signals from DCS, PLC and distributed process controllers into proportional pneumatic output pressure for driving linear and rotary pneumatic valve actuators. This field instrument mitigates performance deviations caused by packing friction, actuator spring hysteresis and air supply fluctuation, locking valve trim at the exact commanded opening percentage to stabilize flow, pressure and temperature regulation loops.

Engineered with NAMUR standard mounting compliance per IEC 534 Part 6, the unit features an M20×1.5 single cable gland entry and no integrated limit switches or position feedback transmitters, delivering a streamlined cost-effective configuration for basic closed-loop process control. Process instrumentation technicians, system integrators and plant maintenance teams gain tangible benefits from its independent zero and span calibration, adjustable damping parameters and robust IP65 sealed housing that resists dust, moisture and corrosive ambient conditions in refineries, chemical plants, power generation stations and water treatment facilities. Its vibration-resistant internal mechanical structure reduces drift during long-term cyclic valve operation and cuts scheduled calibration frequency for critical control loops.