Retractable probe housing EXtract 821

pneumatic

Overview
EXtract 821 is a pneumatically operated retractable probe housing in plastic, designed for installation on process tanks and piping. It provides an extended immersion length up to 194 mm and enables automatic insertion of Ø12 sensors into the process medium and retraction into a cleaning chamber. Final positions (“measuring” / “service”) are signalled pneumatically. Cleaning, rinsing and calibration can be performed while the process remains running.

Your advantages

• Robust design with integrated scraper
• Extends sensor service life and reduces maintenance effort
• Automatic safety lock when sensor is removed
• Plug & play installation with colour- and size-coded connections
• Integrated limit switches / position feedback
• Suitable for use in ATEX areas
• Materials for wetted parts: PVDF or PEEK (PVDF option with Alloy C22 protection cage)
• Immersion length up to 194 mm
• Wide range of process connections and sealing materials
• Rated for up to 10 bar and 140 °C
• Can be automated with electropneumatic control unit EXmatic 470
• Drive unit free of maintenance

Configuration options (examples)

• Wetted materials: PVDF, PEEK
• Sealing materials (wetted): EPDM (FDA/USP VI), FPM (Viton), FFKM (Kalrez)
• Sensor types: 325 mm Ø12 PG13.5 (gel-filled), 380 mm Ø12 PG13.5 (liquid-filled)
• Process connection: Flange DN50 PN16, Flange ANSI 2" 150 lbs
• Cleaning ports: G 1/8" female, G 1/4" female, 1/4" NPT female
• Position feedback: pneumatic or electrical (NAMUR)
• Operating power for pneumatic actuation: compressed air 4...6 bar

Applications

• For all Ø12 sensors (325 mm gel-filled or 380 mm liquid-filled, PG13.5 thread) including pH glass and ISFET sensors, conductivity, temperature, turbidity and other optical sensors
• Chemicals and process industry
• Water and wastewater treatment
• Abrasive or harsh processes
• Processes requiring automated sensor cleaning or calibration

Characteristics / Technical specifications

• Process pressure: 0…10 bar
• Process temperature: -10…140 °C
• Ambient temperature: -10…70 °C
• Immersion length: up to 194 mm
• Sensors: 325 mm Ø12 PG13.5 (gel-filled) / 380 mm Ø12 PG13.5 (liquid-filled)
• Materials: PVDF / Alloy C22 / PEEK
• Sealings: EPDM, FPM (Viton), FFKM (Kalrez)
• Process connections: Flange DN50 PN16 / ANSI 2" 150 lbs
• Cleaning ports: G1/8", G1/4", FNPT 1/4"
• Operating power: compressed air 4...6 bar
• Limit switches / feedback: pneumatic / electrical (integrated)