Agilent Technologies 4890 User manual

Agilent Technologies
Agilent 4890, 5890, 6890
Gas Chromatograph
Rotary Valves
Installation Guide

2Installing Rotary Valves
Notices
© Agilent Technologies, Inc. 2002
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
C
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