manufacturer :       Agilent

model :                   G2880A

annotation :           Dokumente engl .

The Agilent Technologies 6850 Automatic Liquid Sampler (ALS) is specifically designed for use with your 6850 Gas Chromatograph (GC). The sampler consists of an injector module with a high sample vial capacity turret. It mounts directly onto your 6850 GC and is controlled by your Agilent G2629A Control Module, Agilent Cerity NDS system, or Agilent ChemStation .

The 6850 ALS requires a 6850 GC with firmware revision A.03.xx or higher.

6850 ALS Capabilities

Your 6850 ALS comes with a turret that holds up to 27 2-mL sample vials. Also available is an optional turret holding up to 22 4-mL sample vials. With either turret, the 6850 ALS can use up to two bottles each of two solvent types, and uses three bottles for waste collection.

6850 Automatic Liquid Sampler Capabilities

General Options

Syringe size                             5, 10, 25, 50, and 100 µL

Injection volumes                    2%, 10%, 20%, 30%, 40%, or 50% of syringe volume

Syringe rinse solvents            Solvent A: two 4 mL bottles

Solvent B: two 4 mL bottles

Injection Parameter Control

Parameter                                         Range                                                Benefits

Variable sampling depth                     –2 to +30 mm above               Accesses very small

sample volumes

default position                        Accesses a specific layer in

a two-phase sample

Avoids aspirating sample

particulates

Pre-injection syringe                           0–15 rinses using                    Minimizes sample

carryover

rinsing and post-                                 solvent A and/or                      A pre-injection rinse wets

the syringe

injection syringe rinsing                      solvent B                                  without consuming sample

Sample prewashes                             0–15 prewashes                     An additional way to

minimize sample carryover

Injection Parameter Control

Parameter                                         Range                                                 Benefits

Viscosity delay, top of                         0–7 seconds                            Improves sampling plunger stroke                                                                                                   accuracy of viscous

samples

Pre-injection sample                           0–15 pumps                            Ensures accurate and

pumps                                                                                                reproducible sample

volume

Removes bubbles

Minimum sample                                0.1 µL (5-µL syringe)               Prevents overloading the

Injection volume                                                                                 column when using

( single injection)                                                                                 concentrated More information

For more detailed information, including operating procedures, general troubleshooting, and maintenance procedures, see your 6850 GC User Information CD-ROM.

13

  samples , on-

                                                                                                          column injections, or small-

                                                                                                          diameter columns

Maximum sample                               50 µL (100-µL                         Supports ambient

Injection volume                                  syringes)                                 headspace analysis

using gas-tight syringe

Injection plunger speed                       Fast/ Slow                                Fast plunger minimizes

needle

discrimination (see injection flow in vaporizing inlets rate table)

Slow plunger mimics manual techniques

Pre-injection dwell time                       0–1 minute                               Automatically fills needle

with 1 µL of air

after sampling            

Automates “hot needle” injection technique

Post-injection dwell                             0–1 minute                               Mimics manual injection

Time    

Injections per vial                                 1–99 injections                        For replicating sample

analysis

Injection Flow Rates

Syringe Size              Plunger Parameter (µL/min)

(µL)                              Fast                              Slow

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5                                   3,000                            150

10                                 6,000                            300

25                                 15,000                         750

50                                 30,000                          1,500

100                               60,000                         3,000