Agilent Technologies G2743A Instruction Manual

Copyright© 1999 1
Agilent Technologies
Printed in USA 12/99
Part No. G27 5-90107
sa
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

2
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

3
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

5
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)

6
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.
1
2
3
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

7
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

8
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

9
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
sa
The actuator installation is complete.
To solenoid inside
fitting
To solenoid outside
fitting
Heater/sensor
cables
Solenoid outside fitting