Agilent Technologies 4890 Manuale utente

Agilent Technologies

Agilent 4890, 5890, 6890

Gas Chromatograph

Rotary Valves

Installation Guide

2Installing Rotary Valves

Notices

No part of this manual may be reproduced in

any form or by any means (including elec-

tronic storage and retrieval or translation

into a foreign language) without prior agree-

ment and written consent from Agilent

Technologies, Inc. as governed by United

States and international copyright laws.

Manual Part Number

G2739-90107

Edition

First edition, April 2002

Printed in USA

Agilent Technologies, Inc.

2850 Centreville Road

Wilmington, DE 19808-1610 USA

Safety Notices

CAUTION

A CAUTION notice denotes a haz-

ard. It calls attention to an operat-

ing procedure, practice, or the like

that, if not correctly performed or

adhered to, could result in damage

to the product or loss of important

data. Do not proceed beyond a

CAUTION notice until the indicated

conditions are fully understood and

met.

WARNING

A WARNING notice denotes a

hazard. It calls attention to an

operating procedure, practice, or

the like that, if not correctly per-

formed or adhered to, could result

in personal injury or death. Do not

proceed beyond a WARNING

notice until the indicated condi-

tions are fully understood and

met.

Agilent Technologies

Installing Rotary Valves

These instructions describe how to use the hardware kits to

install a new valve in your Agilent Technologies’ 4890, 5890, or

6890 series Gas Chromatograph (GC).

Table 1 Parts supplied

Description

Kit G2739A

(Liquid sample)

Kit G2740A

(Gas sample)

Metering valve 1/16-inch 1

Screw, M3 x 8 mm 2 1

Screw, M3 x 30 mm, chrome-plated 2 1

Label 1 1

Screw, thread-cutting 4

Screw, M4 x 12 mm, Torx™ T-20 4

Fitting, column bulkhead 1 4

Nut, 5/16-inch 1 4

Restrictor bracket 1

1/16-inch SS tube, 102 mm long 1 1

1/16-inch SS tube, 203 mm long 1

1/16-inch SS tube, 360 mm long 1 2

1/16-inch SS tube, 400 mm long 1 1

1/16-inch SS tube, 560 mm long 1 5

1/8-inch nut and ferrule set 1 1

Filter union, reducing 1

Reducer/restrictor, SS 1

Actuator limiter, 36 degrees 0 1

Installation sheet (this document) 1 1

2Installing Rotary Valves

Installing Rotary Valves

Part Identification

Figure 1 Kit G2739A, Liquid Sample Valve

Figure 2 Kit G2740A, Gas Sample Valve

Tubing

Nut and ferrule set

Screws

Restrictor bracket

Metering valve

Nut

Tubing

Reducer/restrictor

Nut and ferrule set

Actuator

Screws

Filter

olumn bulkhead fittings

Nuts

limiter

union

Installing Rotary Valves

Installing Rotary Valves 3

If you purchased a heated valve box (19238A/B, G1580A, or

G1581A), or a side mount kit (G2748A or G2749A), install it

before installing your valve.

To install a valve in a heated valve box, see page 3.

To install a valve on a side mount bracket, see page 8.

Tools needed

Torx T-10 and T-20 drivers

Flat blade screwdriver

Needle-nose pliers

3 mm hex key wrench

Installing a valve in a heated valve box

1If the detector top cover is installed, remove it.

2Remove the upper valve box. Remove the two mounting

screws using a T–20 Torx screwdriver and lift off the upper

valve box. Set it aside.

WARNING Do not install a liquid sampling valve (LSV) in the valve box if you

plan to heat the box above 75°C. Heating an LSV over 75°C can cause

a leak and subsequent explosion. Liquid sampling valves should be

mounted in the side location to avoid potential explosions.

The oven, inlet, detector, and valve box may be very hot. Before

proceeding, turn off the oven and all other heated zones and let them

cool down.

Harmful gases may be present. Hydrogen (if used) can present an

explosion hazard. Before proceeding, turn off all supply gases at

their sources.

Shock hazard. Before proceeding, turn off the GC and disconnect the

power cord.

4Installing Rotary Valves

Installing Rotary Valves

Figure 3 Opening the valve box

3Remove the heater block mounting screw in the lower valve

box.

Figure 4 Removing the heater block screw

4Place the valve in the desired position in the valve box. The

valve rotor index pin of a 6–port valve points toward the

Mounting screws

Upper valve box

Heater/sensor wires

Lower valve box

Valve 4

Valve 1

Valve 2

Valve 3 Remove the screw in

the heater block at the

position where you

will install the valve.

Installing Rotary Valves

Installing Rotary Valves 5

back of the GC if installed correctly. This is the ON position.

Tighten the two screws with a Torx T-10 screwdriver. If this

is the last valve to be installed in the heated zone, make sure

the screws that secure the heater block to the lower valve box

are tight.

Figure 5 Installing the valve

5Use needle-nosed pliers to move the valve rotor index pin of

the valve counterclockwise until the pin touches the valve

stop (OFF position).

Figure 6 Index pin and stops

Tighten these screws

Valve stop OFF position

Valve rotor index pin

6Installing Rotary Valves

Installing Rotary Valves

6Use the tubing and fittings in the hardware installation kit to

plumb the valves. See “Common valve configurations" on

page 11.

Reinstall the upper valve box

1Verify that all valve rotors are in the full counterclockwise

position.

2For each actuator, loosen the link arm lockscrew in the barrel

of the shaft that links the valve and actuator about 1/4 turn.

You may have to apply significant pressure.

Figure 7 Loosening the lockscrew

3For each actuator, use a flat blade screwdriver to turn the

actuator coupling/shaft assembly counterclockwise until

snug.

Figure 8 Setting the coupling shaft

Hex key wrench

Turn counterclockwise

Installing Rotary Valves

Installing Rotary Valves 7

4Locate the two half–moon cutouts at the bottom back of the

upper valve box. Place the upper box on top of the lower

valve assembly, routing the heater/sensor wires through the

cutouts. Secure with two T-20 Torx screws.

5For each actuator, push the coupling/shaft assembly

downward with a flat blade screwdriver until the slot on the

coupling engages the valve rotor index pin.

If the coupling and valve do not engage, check that both are

fully counterclockwise and try again. If necessary, turn the

shaft slightly to engage the coupling.

6Continue to turn the shaft counterclockwise until snug, to

ensure that the valve and actuator are both in the OFF

position.

Figure 9 Turning the valve OFF

7Tighten the link arm lockscrew firmly.

Turn counterclockwise

8Installing Rotary Valves

Installing Rotary Valves

Installing a valve on a side mount bracket

1Secure the clamp ring to the side mount bracket with two

Torx T-20 screws.

Figure 10 Attaching the clamp ring

WARNING The oven, inlet, and detector may be very hot. Before proceeding,

turn off the oven and all other heated zones and let them cool down.

Harmful gases may be present. Hydrogen (if used) can present an

explosion hazard. Before proceeding, turn off all supply gases at

their sources.

Shock hazard. Before proceeding, turn off the GC and disconnect the

power cord.

Mounting screws

Set screw

Clamp ring

Valve

Actuator

Side mount bracket

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