Agilent Technologies 6850 GC Manuale utente

Agilent Technologies

Agilent 6850 GC

Sampling Valves

G2654A - G2659A

G2667A - G2672A

Installation

2Installing Sampling 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

G2630-90160

Edition

Second edition, May 2012

First edition, November 2003

Printed in USA

Agilent Technologies, Inc.

2850 Centerville Road

Wilmington, DE 19808-1610 USA

Warranty

The material contained in this docu-

ment is provided “as is,” and is sub-

ject to being changed, without notice,

in future editions. Further, to the max-

imum extent permitted by applicable

law, Agilent disclaims all warranties,

either express or implied, with regard

to this manual and any information

contained herein, including but not

limited to the implied warranties of

merchantability and fitness for a par-

ticular purpose. Agilent shall not be

liable for errors or for incidental or

consequential damages in connec-

tion with the furnishing, use, or per-

formance of this document or of any

information contained herein. Should

Agilent and the user have a separate

written agreement with warranty

terms covering the material in this

document that conflict with these

terms, the warranty terms in the sep-

arate agreement shall control.

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 6850 GC Sampling Valves

Installation

Agilent Technologies

Installing Sampling Valves on an

Agilent 6850 Gas Chromatograph

G2654A -G2659A

G2667A - G2672A

Installation Kits 4

Tools required 5

Safety information 5

Part Identification 6

Common parts 6

Sampling valves 7

Air control valves 8

Installing a Sampling Valve 9

Installing an Air Control Valve for a Diaphragm-Type Control Valve 15

Installing an Air Control Valve for a Rotary-Type Sampling Valve 17

This document describes installation of a gas or liquid

sampling valve on an Agilent 6850 gas chromatograph

already equipped with either a packed or capillary inlet.

4Installing Sampling Valves

Installing Sampling Valves on an Agilent 6850 Gas Chromatograph

Installation Kits

Six installation kits are available (Table 1).

Except for the sampling valve itself, which is different for

each kit, all kits contain the same items (Table 2).

Table 1 Valve installation kits

Description Inlet Assessory number rotary Accessory number diaphragm

Gas sampling valve, 6-port Packed G2667A G2654A

Gas sampling valve, 6-port Capillary G2668A G2655A

Liquid sampling valve, 4-port, 0.5 µL Capillary G2669A G2656A

Liquid sampling valve, 4-port, 1.0 µL Capillary G2670A G2657A

Liquid sampling valve, 4-port, 0.5 µL Packed G2671A G2658A

Liquid sampling valve, 4-port, 1.0 µL Packed G2672A G2659A

Table 2 Kit contents

Description Qty

Gas or liquid sampling valve and heated valve box 1

Modified lid top cover 1

Lid cam, valve box version 1

Air control valve assembly 1

Air control valve cover plate (diaphragm only) 1

Air control valve torque plate (diaphragm only) 1

10-feet plastic actuator tubing 1

Screw, M4 x 0.7, 12 mm length, pan head 9 (diaphragm)

5 (rotary)

Screw, M4 x 12, T-20 Torx 8

Installation sheet (this document) 1

Installing Sampling Valves on an Agilent 6850 Gas Chromatograph

Installing Sampling Valves 5

Tools required

•Torx T- 10 driver

•Torx T- 20 driver

•Open- end wrenches

•Inlet wrench (for capillary inlet)

Safety information

Before continuing, read the safety information on your

Agilent 6850 Gas Chromatograph User Information

CD- ROM.

WARNING

Before proceeding, turn off the oven and any heated zones and let

them cool down. Turn off all gases at their source, then turn off the

main power switch and unplug the power cord.

6Installing Sampling Valves

Installing Sampling Valves on an Agilent 6850 Gas Chromatograph

Part Identification

Common parts

These are parts that are used with all gas and liquid

sampling valves (Figure 1).

Figure 1 Common parts

Counterbalance cam

Torque plate (diaphragm only)

Cover plate (diaphragm only)

Screws, pan-head

Screws, Torx, for lid

Modified lid top cover

Plastic tubing for

actuator air

Installing Sampling Valves on an Agilent 6850 Gas Chromatograph

Installing Sampling Valves 7

Sampling valves

Parts for liquid and gas sampling valves are shown below.

See Figure 2 and Figure 3.

Figure 2 Valves with capillary inlet

Heated sampling valve

Heater/Sensor cable

To air control valve

Sample in/out ports Gang block fitting

Split trap fitting

Valve insert weldment

This is a liquid sampling valve. Gas sampling valves do not

have the adjustable restrictor between the sample ports.

Figure 3 Valves with packed inlet

Heated sampling valve

To air control valve

Packed inlet

Heater/Sensor cable

Gang block fitting

Heater/Sensor cable

Sample in/out ports

This is a gas sampling valve. Liquid sampling valves have an

adjustable restrictor in the hole between the sample ports.

8Installing Sampling Valves

Installing Sampling Valves on an Agilent 6850 Gas Chromatograph

Air control valves

Parts for the air control valves are show below. See Figure 4

and Figure 5.

Figure 4 Air control valve for a rotary sampling valve

Figure 5 Air control valve for a diaphragm sampling valve

Air control valve

Air control cable

To heated sampling valve

Air control valve

Air control cable

To heated sampling valve

Installing Sampling Valves on an Agilent 6850 Gas Chromatograph

Installing Sampling Valves 9

Installing a Sampling Valve

The sampling valve is installed in a heated valve box on top

of the GC. See Table 3. The box and valve is a

factory- assembled and leak- tested unit. Installation does not

require any disassembly of the unit. See the 6850 Gas

Chromatograph User Information CD- ROM.

The valve is plumbed through an existing inlet, either

capillary or packed.

Table 3 Installing a sampling valve

Step Action Notes

1Remove the lid top cover. aRemove vent tubing, if present.

bRemove detector cover.

cRemove 8 T-20 Torx screws.

dRemove top cover.

2If the valve is to replace a capillary

inlet, remove the insert weldment

and split vent trap.

If the valve is to replace a packed

inlet, continue at Step 3.

aUse the inlet wrench to release the

large nut on the inlet insert weldment.

bLift the inlet insert weldment clear of

the inlet.

Detector cover

T-20 Torx screw

(1 of 8)

Vent tubing,

if present

10 Installing Sampling Valves

Installing Sampling Valves on an Agilent 6850 Gas Chromatograph

cRemove the gang block fitting from the

inlet flow module.

•Be very careful not to lose the small

O-rings.

dRemove the split vent trap bracket

using a T-20 Torx driver.

Table 3 Installing a sampling valve (continued)

Step Action Notes

Large nut

Inlet insert weldment

Inlet flow module

Gang block fitting

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