Schubert & Salzer – Type 8049 Digital Positioner

Overview

The Schubert & Salzer Type 8049 is a compact digital positioner designed for mounting on pneumatic linear and quarter-turn control valve actuators. It features a top-mounted, direct-attachment design that eliminates external stroke linkage components, and delivers near-zero stationary air consumption in the regulated state — minimizing ongoing compressed air costs.

Configuration, diagnostics, and live monitoring are handled through the “DeviceConfig” PC software, which enables self-adapting stroke and zero point calibration without manual adjustment. The Type 8049 is available in 2-wire, 4-wire, and ATEX/FM-certified intrinsically safe versions, with optional IO-Link communication and an integrated process controller variant.

Features & Benefits

• Direct “top-mounted” attachment to the valve actuator — no external stroke linkage exposed to the environment, improving reliability in harsh conditions
• Self-adapting stroke and zero point adjustment eliminates manual calibration and reduces commissioning time
• Near-zero stationary air consumption (less than 0.06 Nl/min for 4-wire version; less than 0.4 Nl/min for 2-wire) — significantly reduces compressed air operating costs
• Compatible with linear actuators (3–28 mm standard stroke, up to 50 mm optional) and quarter-turn rotary actuators, single- or double-acting
• Input signal options include 0/4–20 mA, 0/2–10 V, and IO-Link for flexible integration with modern control systems
• DeviceConfig PC software provides live monitoring, diagnostic data, stroke history, error messages, cycle counts, and operating hours
• Reverse hysteresis as low as 0.2% (standard 0.4%) for precision flow control
• IP 65 protection class for use in wet, dusty, or outdoor industrial environments
• Available in ATEX (Zone 0, 1, 2) and FM-certified intrinsically safe versions for hazardous area installations
• Multiple body material options including standard aluminum/polymer, stainless steel ground plate, or fully stainless steel construction
• Optional integrated process controller (IPC) version eliminates the need for a separate external controller

Technical Specifications

• Input signal: 0/4–20 mA; optional 0/2–10 V; IO-Link
• Nominal stroke: 3–28 mm standard (optional up to 50 mm); 0.12–1.1 in. (optional up to 2 in.)
• Supply air (max): 85 psi (4-wire & 2-wire); 90 psi (ExPro versions)
• Unrestricted air capacity: 40 Nl/min (4-wire); 24 Nl/min (2-wire & ExPro)
• Stationary air consumption: <0.06 Nl/min (4-wire); <0.4 Nl/min (2-wire & ExPro)
• Leakage: <0.01 Nl/min
• Auxiliary power (4-wire version): 24 VDC, max 10 W
• Voltage of working resistance: 2.5 V / 125 Ω @ 20 mA (4-wire); 6.5 V / 325 Ω @ 20 mA (2-wire); 8 V / 400 Ω (ExPro)
• Ambient temperature: 14°F to +167°F (–10°C to +75°C)
• Protection class: IP 65 per DIN 40050
• Air supply port connection: G 1/8″ or NPT 1/8″
• Max. connection section: 1.5 mm²
• Air quality per ISO 8573-1: Class 5 particle / Class 4 oil / Class 3 dew point (4-wire); Class 3 particle / Class 2 oil / Class 3 dew point (2-wire & ExPro)
• Actuation gas: compressed air or non-flammable gases (nitrogen, CO₂)
• Approvals: EU Declaration of Conformity; UKCA Declaration of Conformity; ATEX II 2G Ex ia IIC T4 Gb (ExPro-1) / II 1G Ex ia IIC T4 Ga (ExPro-0); FM IS.CL.I, DIV.1, GP.A,B,C,D T4 entity; IECEx BVS 17.0080
• Mounting: standardized mounting kits for linear and quarter-turn actuators (with optional optical position indicator)

Applications

• Pneumatic control valve automation in process industries including chemical, food & beverage, pharmaceutical, and water treatment
• Linear globe valve positioner applications requiring precise stroke control
• Quarter-turn actuator control for ball-sector, segmented disc, and rotary valve types
• Hazardous area installations requiring ATEX Zone 0/1/2 or FM Division 1 intrinsic safety certification
• Applications where compressed air conservation is critical — near-zero steady-state air consumption
• Systems requiring digital diagnostics, asset management, or IO-Link integration with modern PLCs and DCS platforms
• OEM valve packages requiring compact, top-mounted positioner integration

Models / Configurations

• 8049-4 – 4-wire version; input 0/4–20 mA or 0/2–10 V; 24 VDC auxiliary power; highest air flow capacity (40 Nl/min)
• 8049-2 – 2-wire version; loop-powered; input 4–20 mA; no auxiliary power supply required
• 8049-ExPro-1 – ATEX / IECEx intrinsically safe; rated for Zone 1 and Zone 2 hazardous areas (II 2G Ex ia IIC T4 Gb)
• 8049-ExPro-0 – ATEX / IECEx intrinsically safe; rated for Zone 0, Zone 1, and Zone 2 hazardous areas (II 1G Ex ia IIC T4 Ga)
• 8049-ExPro-FM – FM-certified intrinsically safe version; IS.CL.I, DIV.1, GP.A,B,C,D T4 entity; also available NIFW CL.I, DIV.2
• 8049-IPC – Version with integrated process controller (IPC); eliminates need for a separate external controller
• 8049-IO1 – IO-Link communication version for integration with IO-Link master devices and Industry 4.0 architectures

Type 8049 Accessories

• RM-4 Feedback Module – Analog position feedback module for the 2-wire (8049-2), 8049-ExPro, and 8049-ExPro-FM versions; provides 4–20 mA feedback output and two NAMUR-compatible limit signal transmitters with 0–100% adjustable switching range via DeviceConfig software
• RM-5 Feedback Module – Analog position feedback module for the 4-wire (8049-4) version; includes two electrically isolated limit signal transmitters and a binary input at 24 V; adjustable 0–100% via DeviceConfig software
• Gauge Block – Installs between the positioner and connection block; provides local pressure indication (0–87 psi / 0–6 bar); field-retrofittable
• Optical Position Indicator – Visual position indicator for quarter-turn actuator installations; available as part of standardized mounting kit
• DeviceConfig Software – Free PC configuration and diagnostics software; enables self-adaptation setup, live monitoring, stroke history, error logging, cycle counts, and operating hour tracking

Documentation