4551A Purge-and-Trap Water Autosampler

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Improve sample accuracy and save lab counter space with the Model 4551A Water Autosampler. Designed to work with our 4760 Eclipse Purge-and-Trap Autosampler, the 4551A automates VOC analysis for up to 51 clean or lightly particulated water samples.

  • Overview

    The extremely compact 4551A Water Autosampler fits strategically under the 4760 Eclipse to save bench space. The instrument precisely transfers water samples from standard 40-mL volatile organic analysis (VOA) vials to the sparge vessel of the 4760 Eclipse for purging. A removable spiral autosampler tray holds 51 sample vials for fully-automated operation. Our optional LV-20 Standards Addition Module adds internal standards, surrogate or matrix spike standards, and reduce the volume of standards used.

    Principle applications include: drinking water, wastewater, pharmaceutical, 16+ USEPA-approved methods, VPH and GRO, THMs, BTEX, Geosmin and 2-MIB.

    Model 4551 Features:

    • Automated VOC Analysis of up to 51 water samples
    • Compact! Fits directly under the 4760 Eclipse Sample Concentrator
    • Transfers water samples with light particulates (<100 µm) without clogging the system
    • LV-20 Standards Addition Module (optional) automates addition of internal or surrogate standards
    • Program multiple rinses and blanks for maximum sequence flexibility
    • Decrease maintenance downtime and costs – no XYZ arm
    • Peristaltic pump and sample loop eliminate slow syringe drives
    • Fastest VOC autosampler available

  • Specifications
    4551A 46 cm H x 40 cm W x 42.6 cm D
    (18.11 in H x 15.75 in W x 16.77 in D)
    4551A and Eclipse

    94.9 cm H x 40 cm W x 42.6 cm D
    (37.36 in H x 15.75 in W x 16.77 in D)

    Depth with Cover 53 cm (20.86 in)
    4551A 16.3 kg (36 lb)

    4551A and Eclipse
     32.6 kg (72 lb)
    Sample Loop  
    5 mL

    Glass loop (standard)

    Valve Six-port electrically actuated, 12 VDC, Valco® Cheminert®

    Sample Transfer Pathway


    Sampling Needle

    7", two-hole, stainless steel
    PEEK® Tubing 1/16" O.D. x 0.040" I.D. x 17" 
    Nickel Tubing 1/16" O.D. x 0.040" I.D. x 26"



    Directive 89/336/EEC:1989
    CISPR 11:1990/EN55011 (1991) Group 1 Class A
    IEC 801-2/EN61000-4-2
    IEC 801-3/EN61000-4-3
    IEC 801-4/EN61000-4-4

    12 months parts and labor

    Sample Transfer


    Accuracy Better than ±0.3%
    Power Requirements


    Voltage 100-230 VAC±10% (autoselecting)
    Frequency 50/60 Hz
    Gas Requirements


    Purity 99.999% (UHP) He or N2
    Pressure 50-125 psi
    Water Supply

    Clean water free of VOCs for rinsing the sample pathway and running blanks


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