Product Overview

The Emerson 38B5786X132 is a high-precision pneumatic relay engineered specifically for the Fisher™ FIELDVUE™ DVC6000 series of digital valve controllers. This component serves as the power amplification stage within the positioner, converting low-volume pneumatic signals into the high-volume air flow required to actuate industrial control valves. Featuring a single-acting, direct-control architecture and a standard bleed configuration, the 38B5786X132 ensures deterministic and stable valve positioning in complex process environments.

This relay is critical for maintaining the high-speed response and accuracy expected from FIELDVUE™ instrumentation. By managing the airflow to the valve actuator, it facilitates precise modulation in applications across the oil and gas, chemical processing, and power generation sectors. Its design is optimized for low air consumption without sacrificing the dynamic performance necessary for tight process control.

Technical Performance and Operational Efficiency

The 38B5786X132 is built to handle a broad supply pressure range of 20 to 100 psig (1.4 to 6.9 bar), providing versatile compatibility with standard instrument air headers. With a high flow capacity (typically exceeding 5 Cv), the relay allows for rapid actuator movement, achieving full-stroke response times in under one second. This rapid adjustment capability is essential for mitigating process upsets and maintaining steady-state accuracy.

Environmental durability is a core feature, as the module is rated for operation in extreme temperatures ranging from -40°C to +85°C. Furthermore, the unit is optimized for energy efficiency, with a steady-state air consumption rate of less than 5 SCFH. This combination of robust construction and low operational overhead makes the 38B5786X132 an ideal solution for critical turbomachinery and process control loops.

Technical Specifications

• Manufacturer: Emerson (Fisher)

• Model Designation: 38B5786X132

• Component Type: Single-Acting Direct Pneumatic Relay

• Bleed Configuration: Standard

• Compatible Hardware: Fisher™ FIELDVUE™ DVC6000 Series

• Supply Pressure Range: 20–100 psig (1.4–6.9 bar)

• Output Pressure Range: 0–100% of supply

• Flow Capacity: > 5 Cv

• Max Steady-State Air Consumption: < 5 SCFH

• Response Time: < 1 second (full stroke)

• Operating Temp Range: -40°C to 85°C (-40°F to 185°F)

• Dimensions: 12.1 x 5.2 x 16.6 cm

• Net Weight: 0.34 kg

Key Functional Advantages

• Optimized Signal Gain: Specifically tuned for DVC6000 controllers to provide linear and repeatable valve positioning.

• Rapid Response: Minimizes dead time in the safety or control loop through high-volume air delivery.

• Resilient Construction: Designed to withstand the vibration and corrosive atmospheres typical of offshore and refinery installations.

• Efficiency Focus: Low air bleed rates contribute to reduced plant-wide instrument air costs and compressor wear.