Agilent Technologies G2743A Manuale di istruzioni

Agilent Technologies

Printed in USA 12/99

Part No. G27 5-90107

Installing the G2743A/G2745A

Valve Actuator Kits

This document describes the installation of a valve actuator on the

4890 Series, 5890 Series, and 6890 Series Gas Chromatographs GC).

The kits contain:

Description

G2743A kit

(6 90 GC)

G2745A kit

(4 90/5 90 GC)

Tubing connector 2 2

Screw, machine M ×8 mm 2

Screw, machine M ×12 mm 2

Actuator assembly 1 1

Solenoid valve* 1 1

Installation sheet (this document) 1 1

* Solenoid valve includes standoff screws and fittings

Figure 1. Part identification

Tools required

T-10 and T-20 Torx™ drivers

Flat-blade screwdriver

3 mm hex key

7/64-inch hex key

4 mm hex key

Screws (1 or 2)

Actuator

Hex wrench

Standoffs

Tubing connectors

Solenoid

Connector on 6890 GC;

pins on 890/5890 GCs

Installing the actuator on a heated valve box

WARNING The valve box is insulated with a fibrous material that can cause irritation to

the skin, eyes, and mucous membranes. Always wear gloves when working

with the insulation. If the insulation is flaky/crumbly, wear protective eyewear

and a respirator.

1. Install the heated zone kit if purchased) as described in the instructions

included with that accessory. Leave the GC covers off and the power cord

disconnected.

2. Hold the upper valve box over a trash can, then remove the pre-cut

insulation from the appropriate hole in the upper valve box. Remove any

excess or loose pieces from around the hole.

3. Close the valve box.

Valve 1 position

Valve 2 position

Valve 3 position

Valve position

4. Align the actuator assembly over the appropriate valve position. Note that

the cylinder always mounts away from the center of the valve box. Insert

the actuator drive shaft through the hole.

5. Fasten the actuator to the upper valve box with two T-20 Torx screws.

Cylinder away from

center of valve box

Front of GC

Back of GC

Installing the actuator on a side mount bracket

1. Install the side mount bracket on the left side of the GC using four

machine screws 6890 GC) or four self-tapping screws 4890/5890 GC).

2. Attach the clamp ring to the back of the bracket with two screws.

3. Align the actuator assembly with the upper or lower standoffs. The

cylinder must be down. Insert the actuator drive though the hole in the

bracket, and secure with two T-20 Torx screws.

Torx T-20 screw

Actuator, cylinder down

Side mount bracket

Valve (to be

installed later)

Installing the solenoid on a 4 90/5 90 GC

1. If they are not already removed, remove the electronics cover and the GC

right side cover.

2. Install the two tubing connectors into the new solenoid valve.

Caution Do not remove the air supply fitting shown below. This fitting is cemented in

place and must not be disturbed.

3. Remove the nuts that hold the existing solenoids to the solenoid bracket.

4. Separate the end solenoid with the air fitting from the others. Insert the

new solenoid between the end solenoid and the others. Be sure that there

are

O-rings on both sides of the solenoid.

5. Adjust the threaded rods and tighten the nuts.

O-ring

Air supply fitting, do not remove

To normally-actuated actuator port

To normally-relaxed actuator port

Threaded rod with

nut and washer

(1 of 2)

Bracket

Cables

9-pin connector

6. Insert the cable pins in the top wired side) of the connector. Press them

down until they lock.

7. Connect the tubing from the actuator to the solenoid.

Blue (SOLENOID 1) 1

Blue (SOLENOID 2) 2

Blue (SOLENOID 2) 3

Blue (SOLENOID 1) 4

Grn/Yel (GROUND) 5

Blue (SOLENOID 4) 6

Blue (SOLENOID 3) 7

Blue (SOLENOID 3) 8

Blue (SOLENOID 4) 9

123

456

789

AS SEEN FROM WIRED SIDE

Wire

color Controls Number

View the connector from the back (wired) side.

Pin 1 is farthest from the solenoid mount.

Normally-actuated port

Normally-relaxed port

90° max

Installing the solenoid on a 6 90 GC

1. If they are not already removed, remove the electronics cover and the GC

right side cover.

2. Install the two tubing connectors into the top of the new solenoid valve.

3. Use a 4 mm hex key to remove the two mounting screws that secure the

solenoid block to the bracket.

Mounting screws

Tubing connectors

4. Use a 7/64-inch hey key to remove the two screws that hold the end plates

and solenoids together.

5. Screw the two standoff screws supplied with your actuator kit into the

standoff screws in the existing solenoid valve, then install the new

solenoid valve. Be sure the O-rings are properly seated in the solenoid.

6. Re-assemble the end plates onto the solenoid assembly.

7. Re-install the assembly onto the bracket.

8. Cut the tie-wrap around the tubing leading from the actuator and route the

tubing as shown in the next figure. The tubing from the side of the actuator

connects to the outside fitting on the solenoid the fitting farthest from the

main board). Trim the tubing as needed to keep installation neat. See

page 10.

Standoff screws

10 Agilent Technologies

G27 5-90107

The actuator installation is complete.

To solenoid inside

fitting

To solenoid outside

fitting

Heater/sensor

cables

Solenoid outside fitting

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