Welker ALS-1 Instruction manual

® Copyright 2009, Welker, Inc.
Installation,
Operation,
&
Maintenance
Manual
Welker® Analyzer Liquid Shutoff
Models
ALS-1
ALS-1HP
ALS-2
ALS-3
ALS-4HP
The information in this manual has been carefully checked for accuracy and is intended to be used as a guide to
operations. Correct operating and/or installation techniques, however, are the responsibility of the end user. Welker
reserves the right to make changes to this and all products to improve performance and reliability.
13839 West Bellfort
Sugar Land, Texas 77498-1671
U.S.A.
Tel.: [phone]
Tel.: [phone]
Fax: [phone]
www.welkereng.com

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TABLE OF CONTENTS
IOM-077 Page 3 of 10
ALS-1; ALS-1HP; ALS-2; ALS-3; ALS-4HP
Rev: B
Last updated: 9/8/2009
1GENERAL 4
1.1 Introduction........................................................................................................................................4
1.2 Product description & specifications..................................................................................................4
2INSTALLATION INSTRUCTIONS 5
2.1 General ...............................................................................................................................................5
2.2 Instructions.........................................................................................................................................5
2.3 Back purging ......................................................................................................................................5
3MAINTENANCE INSTRUCTIONS 7
3.1 General ...............................................................................................................................................7
3.2 Instructions.........................................................................................................................................8
Welker, Welker Jet®, and WelkerScope®are Registered Trademarks owned by Welker, Inc.

INTRODUCTION
IOM-077 Page 4 of 10
ALS-1; ALS-1HP; ALS-2; ALS-3; ALS-4HP
Rev: B
Last updated: 9/8/2009
1 GENERAL
1.1 Introduction
We appreciate your business and your choice of Welker products. The installation, operation, and
maintenance liability for this product becomes that of the purchaser at the time of receipt. Reading the
applicable Installation, Operation, and Maintenance (IOM) Manual prior to installation and operation of
this equipment is required for a full understanding of its application and performance prior to use. If you
have any questions, please call 1-800-776-7267 in the USA or 1-281-491-2331.
The following procedures have been written for use with standard Welker parts and equipment.
Assemblies hat have been modified may have additional requirements and specifications that are not listed
in this manual.
Notes, Warnings, and Cautions
Notes emphasize information or set it off from the surrounding text.
Caution messages appear before procedures that, if not observed, could result in
damage to equipment.
Warnings alert users to a specific procedure or practice that, if not followed
correctly, could cause personal injury.
1.2 Product description and specifications
The Welker Analyzer Liquid Shutoff is designed to be a final defense against liquid carryover into
injection valves, columns of gas chromatographs, and other analytical equipment. If liquids should enter
the device, it will push a ball against a seal, shutting off flow to the analyzer. The design of the unit allows
only gases to pass through freely. Table 1

INSTALLATION & OPERATION
IOM-077 Page 5 of 10
ALS-1; ALS-1HP; ALS-2; ALS-3; ALS-4HP
Rev: B
Last updated: 9/8/2009
2 INSTALLATION INSTRUCTIONS
2.1 General
After unpacking the unit, check it for compliance and for any damages that may have occurred during
shipment.
Claims for damages caused during shipment must be initiated by the receiver and directed to the
shipping carrier. Welker is not responsible for damages caused from mishandling by the shipping .
The ALS must be mounted vertically with the product outlet facing up (see Figure 1). The unit will
function properly only in a vertical position.
To install fittings in the NPT ports, first remove the cap on the device and then install the fittings.
Rotating the cap while it is connected to the device can cause damage to the unit. After installation,
hand tighten the cap back onto the device. Do not use a wrench to tighten the cap or body.
When sealing fittings with PTFE tape, refer to the proper sealing instructions for the tape used.
2.2 Instructions
2.2.1 Connect the product supply to the inlet port at the
bottom of the ALS.
It is recommended to install a Welker LE-2 Liquid
Eliminator upstream of the ALS.
2.2.2 Connect the outlet of the ALS to the analytical
instrument.
2.2.3 The ALS is now ready to be pressurized and put into
service.
Figure 1
2.3 Back purging
In the event that liquids enter the ALS and shut off the flow, a back purge is recommended to remove the
unwanted liquids from the sample line (see Figure 2).

INSTALLATION & OPERATION
IOM-077 Page 6 of 10
ALS-1; ALS-1HP; ALS-2; ALS-3; ALS-4HP
Rev: B
Last updated: 9/8/2009
FIGURE 2
Refer to this Figure throughout the following Section.
2.3.1 Install a valve both upstream and downstream of the ALS. The system should be purged from the
analyzer to the sample point.
2.3.2 Close both the back purge valve and the back purge drain valve.
2.3.3 Connect a safe auxiliary gas supply to the back purge valve located between the ALS and the
analyzer.
For the back purge to be most effective, helium should be used.
2.3.4 Make sure all outlet valves are open on the sample devices.
2.3.5 Open the back purge valve between the ALS and the analyzer. This will apply pressure to the ALS,
opening up flow. Any liquids and gases in the device will be forced back to the back purge drain
valve.
2.3.6 Open the back purge drain valve to drain liquid from the system.

MAINTENANCE
IOM-077 Page 7 of 10
ALS-1; ALS-1HP; ALS-2; ALS-3; ALS-4HP
Rev: B
Last updated: 9/8/2009
3 MAINTENANCE INSTRUCTIONS
3.1 General
Prior to maintenance or disassembly of the unit, it is advisable to have a repair kit handy for the system in
case of unexpected wear or faulty seals. All maintenance and cleaning of the unit should be done on a
smooth, clean surface.
We recommend that the unit have annual maintenance under normal operating conditions. In
the case of severe service, dirty conditions, excessive cycling usage, or other unique applications
that may subject the equipment to unpredictable circumstances, a more frequent maintenance
schedule may be appropriate.
New seals supplied in spare Parts kits are not lubricated. They should be lightly coated with
lubrication grease (Dow Corning 111 [DC 111] or equivalent lubricant) before they are installed into
the equipment. This helps with the installation of the seals while reducing the risk of damage when
positioning them on the parts.
The cap and body of the device should be hand tightened only.
FIGURE 3
Refer to this Figure throughout the entire maintenance process.
Recommended Tools
It would be advisable to have the following tools available for maintenance of
the unit; however, tools used will vary depending on model.
•6" Crescent wrench (2)
•Small screwdriver

MAINTENANCE
IOM-077 Page 8 of 10
ALS-1; ALS-1HP; ALS-2; ALS-3; ALS-4HP
Rev: B
Last updated: 9/8/2009
3.2 Instructions
3.2.1 Depressurize the ALS.
3.2.2 Disconnect all tubing from the ALS.
3.2.3 Remove the liquid shutoff glass assembly (Parts 6, 7, and 11) from its body (Part 10). If you have
the ALS-4HP model, simply remove the body (Part 10) from the cap (Part 4).
3.2.4 Replace all applicable seals (Parts 5, 1, 2, 3, and 9) in the device (also see Figure 4).
Do not lubricate Part 2.
Figure 4
Not applicable for the ALS-4HP model.
3.2.5 Remove the ball (Part 8) and examine it for scratches and wear. If deep scratches or excessive wear
exist, the ball will need to be replaced.
3.2.6 Reinsert the ball into the guide (Part 11). For the ALS-4HP model, reinsert the ball into the cap
(Part 4).
3.2.7 Reinstall the glass assembly inside the cap (Part 4). Not applicable for the ALS-4HP.
3.2.8 Hand tighten the cap (Part 4) to the body (Part 10).
3.2.9 Maintenance is complete. The unit is now ready for reinstallation.

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13839 West Bellfort, Sugar Land, Texas 77498-1671
Phone: [phone]
Fax: [phone]
Toll Free: [phone]
Web Page: www.welkereng.com