Agilent Technologies 6850 GCs Instruction Manual

Installing an Auxiliary Pressure

Agilent 6850 GCs

Accessory G3349B

Control Module

This kit contains:

The module is factory-assembled. Do not disassemble it during installation.

Description Quantity

Cable tie .062-.625 diameter 2

Hex nut w/lockwasher 1

Disposable wrist strap 1

Minifold label 1

Restrictor kit 1

• FID air restrictor (brown) 3

• Blue dot restrictor 3

• O-rings (6 pk) 1

• Tube zero restrictor 3

• External H2flow limiter 2

• External Flow Restrictor Install Guide 1

Aux. press. control module assembly (with covers) 1

Back panel replacement for the GC 1

6850 GC user information CD 1

ChemStation software CD 1

Installation sheet (this document) 1

Installing an Auxiliary Pressure Control Module

Parts identification

Aux. pressure

assembly

Minifold label

Hex nut

w/lockwasher

control module

Installing an Auxiliary Pressure Control Module

Required tools

•Torx®T-20 screwdriver

• Needle-nose pliers

Overview

Caution Before starting, review the safety information listed at the end of this

document.

1. Disconnect the GC.

2. Install the new module.

3. Restore the GC to operating condition.

Installing an Auxiliary Pressure Control Module

Disconnect the GC

WARNING Hydrogen gas is flammable and potentially explosive. Before replacing the

module, turn off the hydrogen gas at the source.

1. Turn off the GC and unplug the power cord. Allow time for all heated

zones to cool.

2. Disconnect all cables from the GC.

3. Turn all gases off at their sources. Disconnect the carrier and detector

gas tubing from the back panel of the instrument.

Disconnect gas supply tubing

from these fittings

Installing an Auxiliary Pressure Control Module

Install the new module

4. Remove the seven T-20 screws on the back panel. Save the screws.

5. Tilt the top of the panel away from the GC.

If you have a Series II GC, save this panel. Otherwise, set this panel

aside because you will no longer use it. A new panel comes with the kit.

Install the new module

Caution Always hold the module by its support bracket to avoid damaging board

components.

1. Change one or more auxiliary channel frits, if needed. See “Changing

the flow restrictors (optional)” on page 8.

Remove

Installing an Auxiliary Pressure Control Module

Install the new module

2. If you will be using the back panel from the kit, use needle-nose pliers to

remove the knockouts for the ribbon cable and power cable slots.

3. Remove the tape from around the new control module and thread the

ribbon cable through the slot in the back panel.

4. Attach the ribbon cable to the pneumatics control board (at P9).

High voltage power

Low voltage power

Ribbon cable slot

Ribbon cable connector

Installing an Auxiliary Pressure Control Module

Install the new module

5. Gather the excess gas tubing from the gang fitting block in a loop and tie

it together with a cable tie.

6. Attach the control module to the back panel by hooking the tabs on the

module just inside the ribbon cable slot. Position it so you can insert the

threaded stud through the hole in the panel. On the inside, use the hex

nut with lockwasher to hold the stud in place.

7. Install the back panel.

Gas tubing

Cable tie

Control module

Nut holding stud in place

Installing an Auxiliary Pressure Control Module

Install the new module

Changing the flow restrictors (optional)

The auxiliary channels are controlled by a pressure setpoint. To work

properly, there must be adequate flow resistance downstream of the

pressure sensor. The auxiliary channel pneumatics manifold provides a frit-

type restrictor for each channel.

Four frits are available:

The red dot frit is in all three channels when the instrument is shipped.

Figure 1 and Figure 2 show approximate pressure/flow relationships for the

three dot frits, assuming there is no significant resistance downstream of the

frits.

If the Zero resistance frit is installed, the user must provide flow resistance

downstream and generate the pressure/flow relationships.

WARNING When hydrogen is used, dangerously high flows are possible if insufficient

flow resistance is provided downstream of the supply tube. Always use

either the High (blue dot) or Medium (red dot) frit with hydrogen. You may

also want to use the restrictor kit that comes with this accessory. Its

installation document describes using it for the 6890 GC, but still applies to

the 6850 GC.

Frit marking Flow resistance Agilent part number

Blue Dot High 19234-60660

Red Dot Medium 19231-60770

Brown Dot Low 19231-60610

None (brass tube) Zero G1570-20540

Installing an Auxiliary Pressure Control Module

Install the new module

Figure 1. Pressure requirements for AUX EPC flow restrictors

with air, nitrogen, or helium

19234-60660

(blue dot)

19231-60770

(red dot)

19231-60610

(brown dot)

Minimum

source

pressure

(psig)

0.1 100.0 1000.01.0 10.0

Gas Flow in mL/min

(Ambient conditions: 25°C, 14.7 psia)

Installing an Auxiliary Pressure Control Module

Install the new module

Figure 2. Pressure requirements for AUX EPC flow restrictors

with hydrogen

19234-60660

(blue dot)

19231-60770

(red dot)

19231-60610

(brown dot)

0.1 100.0 1000.01.0 10.0

(Ambient conditions: 25°C, 14.7 psia)

Gas Flow in mL/min

Minimum

source

pressure

(psig)

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