Welker ESSENTIALS AD681BK User manual

INSTALLATION, OPERATION, ANDMAINTENANCEMANUAL
WELKER ESSENTIALS™ GAS SAMPLER
DRAWING NUMBERS
AD681BK
AD681BV

MANUAL NUMBER
IOM-222

REVISION
Rev. A, 3/29/2019

TABLEOFCONTENTS
2IOM-222 MODEL: ESSENTIALS™ GAS SAMPLER REV: A 13839 West Bellfort Street, Sugar Land, TX 77498 welker.com Service Department 281.491.2331
Copyright © 2019 Welker, Inc. All rights reserved. Welker®, W Welker®, W logo, WelkerScope®, WelkerJet®, and OdorEyes® are registered trademarks of Welker, Inc.
 SAFETY 3
1. PRODUCT INFORMATION 4
1.1 Introduction 4
1.2 Product Description 4
1.3 Specifications 5
1.4 Equipment Diagrams 6
  
2. INSTALLATION & OPERATION 8
2.1 Before You Begin 8
2.2 Preparing for Installation 8
2.3 Installation 12
2.4 Start-Up Procedures 13
2.5 Sampling Procedures 16
  
3. MAINTENANCE 17
3.1 Before You Begin 17
3.2 Maintenance 18
3.3 Adjusting the Inline Relief 18
3.4 Troubleshooting 21
  
 APPENDIX 22
 A: Referenced or Attached Documents 22
 B: Quick-Start Quide 23


IMPORTANTSAFETYINFORMATION
READALLINSTRUCTIONS
Notes emphasize information and/or provide additional information to assist the user.
Caution messages appear before procedures that could result in damage to equipment if not observed.
Warning messages appear before procedures that could result in personal injury if not observed.
This manual is intended to be used as a basic installation and operation guide for the Welker Essentials™ Gas Sampler. For comprehensive instructions, please refer
to the IOM Manuals for each individual component. A list of relevant component IOM Manuals is provided in Appendix A of this manual.
The information in this manual has been carefully checked for accuracy and is intended to be used as a guide for the installation, operation, and maintenance of
the Welker equipment described in this manual. Correct installation and operation, however, are the responsibility of the end user. Welker reserves the right to make
changes to this manual and all products in order to improve performance and reliability.
BEFOREYOUBEGIN
Read these instructions completely and carefully.
IMPORTANT - Save these instructions for local inspector's use.
IMPORTANT - Observe all governing codes and ordinances.
Note to Installer - Leave these instructions with the end user.
Note to End User - Keep these instructions for future reference.
Installation of this Essentials™ Gas Sampler is of a mechanical and electrical nature.
Proper installation is the responsibility of the installer. Product failure due to improper installation is not covered under the warranty.
If you received a damaged Essentials™ Gas Sampler, please contact a Welker representative immediately.
Phone: 281.491.2331
Address: 13839 West Bellfort Street
Sugar Land, TX 77498
SAFETY
3IOM-222 MODEL: ESSENTIALS™ GAS SAMPLER REV: A 13839 West Bellfort Street, Sugar Land, TX 77498 welker.com Service Department 281.491.2331

1.1 Introduction
We appreciate your business and your choice of Welker products. The installation, operation, and maintenance liability for this
equipment becomes that of the purchaser at the time of receipt. Reading the applicable Installation, Operation, and
Maintenance (IOM) Manuals 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 Welker at 1-281-491-2331.
*The following procedures have been written for use with standard Welker parts and equipment. Assemblies that have been modified may have additional
requirements and specifications that are not listed in this manual.
1.2 Product Description
The Welker Essentials™ Gas Sampler is a low-cost sampler designed to extract samples from the center one-third (¹⁄₃) of a
pressurized gas pipeline and collect them in a connected sample cylinder. Its high durability and low maintenance requirements
make it the ideal sampler for remote field locations.
The Essentials™ Gas Sampler is comprised of a sample probe, Welker IR-7 Instrument Regulator, Welker MPS-2 Micropurge
Sample Pump, and solenoid. The compact design of this probe mounted sampler eliminates long tubing runs and sample lag
time. By minimizing the distance between the product source and the MPS-2, the Essentials™ Gas Sampler ensures quality
sample grabs. With every actuation, pressure is applied to the top of the MPS-2 piston, fully displacing the trapped sample into
the sample cylinder.
The Essentials™ Gas Sampler can be connected to a Programmable Logic Controller (PLC) or other signal control system to
operate the solenoid. Alternatively, the Essentials™ Gas Sampler can be supplied with a Welker 6Tc Timer/Controller, which is
capable of operating the solenoid for timed or proportional to flow sampling.

For this manual, the term "PLC," or Programmable Logic Controller, will be used to refer to the PLC, EFM, flow computer, or
other signal control system used by the customer to activate and operate the solenoid.
Welker may custom design the Essentials™ Gas Sampler to suit the particular application and specifications of each customer.
SECTION 1: PRODUCTINFORMATION
4IOM-222 MODEL: ESSENTIALS™ GAS SAMPLER REV: A 13839 West Bellfort Street, Sugar Land, TX 77498 welker.com Service Department 281.491.2331

1.3 Specifications

The specifications listed in this section are generalized for this equipment. Welker can modify the equipment according to your
company's needs. Please note that the specifications may vary depending on the customization of your equipment.
Table 1: Essentials™ Gas Sampler Specifications
Products Sampled Natural Gas and Other Gases Compatible With the Materials of Construction
Materials of Construction 316/316L Stainless Steel (Wetted Parts), Anodized Aluminum
(Non-wetted Parts), Polycarbonate (Enclosure), PTFE, Teflon®, and Viton®
Maximum Allowable Operating Pressure 1440 psig @ -20 °F to 120 °F (99 barg @ -28 °C to 48 °C)
Connections Pipeline: ¾" MNPT
Sample Outlet: ¼" MNPT
Regulator Output Range 50–100 psig (3–6 barg)
Insertion Length 8"
Insertion Diameter ³⁄₈"
Electrical Connection
DC 6 V
DC 12 V
DC 24 V(Standard)
Sample Volume 0.25 cc
Operation Piston-Operated Pump
Enclosure Dimensions 10" x 8" x 4" (Height x Width x Depth)
Features
Polycarbonate Enclosure With Clear Cover
Purge Manifold
Solenoid
Welker IR-7 Instrument Regulator With Relief and Pressure Gauge
Welker MPS-2 Micropurge Sample Pump
Option Welker 6Tc Timer/Controller
5IOM-222 MODEL: ESSENTIALS™ GAS SAMPLER REV: A 13839 West Bellfort Street, Sugar Land, TX 77498 welker.com Service Department 281.491.2331

1.4 Equipment Diagrams
Figure 1: Standard Essentials™ Gas Sampler Diagram
6IOM-222 MODEL: ESSENTIALS™ GAS SAMPLER REV: A 13839 West Bellfort Street, Sugar Land, TX 77498 welker.com Service Department 281.491.2331

Figure 2: Essentials™ Gas Sampler With Optional Welker 6Tc Timer/Controller
7IOM-222 MODEL: ESSENTIALS™ GAS SAMPLER REV: A 13839 West Bellfort Street, Sugar Land, TX 77498 welker.com Service Department 281.491.2331

2.1 Before You Begin

After unpacking the unit, check the equipment for compliance and any damage that may have occurred during shipment.
Immediately contact a Welker representative if you received damaged equipment.


When sealing fittings with PTFE tape, refer to the proper sealing instructions for the brand used.


All electrical connections must meet local and national electric codes, and excessive weight added to the conduit run must be
supported.

1. Welker recommends that the probe be installed in the top of the pipe and inserted into the center one-third (¹⁄₃) of the
pipeline in a location where the product is well-mixed and will yield an accurate and representative sample.
2. The sample probe should be located in the least turbulent area of the flowing stream (i.e., not in a header or
blow-down stack and away from obstructions, elbows, and partially closed valves).
2.2 Preparing for Installation

To watch a short video of these instructions, scan the QRcode below or go to welker.com/videos/EssentialsGasSampler_
AssemblyInstructions.mp4.

1. Prior to installing the Essentials™ Gas Sampler to the pipeline, the gauge assembly and sample outlet tubing must be
installed (Figure 3).

Figure 3: Gauge and Tubing Assemblies

SECTION 2: INSTALLATION&OPERATION
8IOM-222 MODEL: ESSENTIALS™ GAS SAMPLER REV: A 13839 West Bellfort Street, Sugar Land, TX 77498 welker.com Service Department 281.491.2331

2. Lay the Essentials™ Gas Sampler on a smooth, clean surface.
3. Undo the enclosure clasps and open the enclosure door (Figure 4).

Figure 4: Opening the Enclosure

4. If applicable, turn the knobs on the front panel counterclockwise to loosen them, and then open the front panel (Figure
4).
Gauge Assembly
5. Wrap the exposed threads on the gauge assembly with PTFEtape (Figure 3).
6. Install the gauge assembly to purge valve B (Figure 5).

Figure 5: Installing the Gauge Assembly

7. Using a crescent or pipe wrench, tighten the gauge assembly. Ensure that the pressure gauge face is upright and that
the tube elbow is on top.
9IOM-222 MODEL: ESSENTIALS™ GAS SAMPLER REV: A 13839 West Bellfort Street, Sugar Land, TX 77498 welker.com Service Department 281.491.2331

Tubing Assembly
8. Thread the tubing assembly through the open port in the bottom of the enclosure (Figure 6). Note the straight run of
the tubing should exit the bottom of the enclosure, as this end of the tubing connects to the gauge assembly.

Figure 6: Installing the Tubing Assembly

9. Fit the grommet of the tubing assembly firmly in the port in the bottom of the enclosure to seal the port.
10. Insert each end of the tubing assembly into the appropriate tube elbow.

The bottom of the tubing assembly should connect to the tube elbow in the gauge assembly.
The top of the tubing assembly should connect to the tube elbow at the sample outlet of the Welker MPS-2 Micropurge
Sample Pump.

11. Use a wrench to tighten the ends of the tubing into the tube elbows.
10 IOM-222 MODEL: ESSENTIALS™ GAS SAMPLER REV: A 13839 West Bellfort Street, Sugar Land, TX 77498 welker.com Service Department 281.491.2331

Determining Insertion Depth
12. Prior to installation, the length the sample probe will need to travel inside the pipeline must be determined. Measure
the distance from the top of the pipeline threadolet to the desired insertion depth (e.g., the center one-third (¹⁄₃) of the
pipeline) (Figure 7). This will be the insertion length.

Figure 7: Determining the Insertion Depth

13. Beginning at the tip of the sample probe, measure along the probe to the desired insertion depth (Figure 1 or Figure 2).
Use a felt tip pen to mark this point.
14. Using tubing cutters, remove the excess tubing at the marked point, and then file and smooth the cut edge of the
sample probe.
15. The Essentials™ Gas Sampler is now ready to be installed to the pipeline.
11 IOM-222 MODEL: ESSENTIALS™ GAS SAMPLER REV: A 13839 West Bellfort Street, Sugar Land, TX 77498 welker.com Service Department 281.491.2331

2.3 Installation
1. Depressurize the pipeline.

The pipeline must be depressurized prior to installing and removing the unit.

2. Ensure that product inlet valve A and purge valve B are closed (Figure 1 or Figure 2).
3. Wrap the threads of the threaded pipeline connection with PTFEtape.
4. Install the Essentials™ Gas Sampler to the mating connection on the pipeline and tighten.
5. If a timer or controller will be used to operate the solenoid, connect from the customer-supplied timer or controller to
the solenoid.
6. If a Programmable Logic Controller (PLC) will be used to operate the solenoid, make the appropriate electrical
connections between the PLC and the solenoid.

For this manual, the term "PLC," or Programmable Logic Controller, will be used to refer to the PLC, EFM, flow computer, or
other signal control system used by the customer to activate and operate the solenoid.

7. The Welker IR-7 Instrument Regulator comes factory-set to 50 psig and is equipped with a relief valve pre-set to 85 psig
to relieve pressure and protect the equipment in the case of a seal leak or regulator failure. To adjust the regulator
setting, loosen the jam nut, and then loosen or tighten the adjusting screw until the regulator pressure gauge reads the
desired outlet pressure (Figure 8). Holding the adjusting screw with a wrench, tighten the jam nut to secure the
adjusting screw at the desired outlet pressure.

Figure 8: Regulator Outlet Pressure Adjustment

8. The sample cylinder may now be installed.
12 IOM-222 MODEL: ESSENTIALS™ GAS SAMPLER REV: A 13839 West Bellfort Street, Sugar Land, TX 77498 welker.com Service Department 281.491.2331

Installing the Sample Cylinder

A Welker SCSingle Cavity Cylinder is recommended for use with this unit.

9. Ensure that the inlet and outlet valves on the sample cylinder are closed.
10. Install the inlet valve of the sample cylinder to the sample outlet on the Essentials™ Gas Sampler (Figure 1 or Figure 2).
11. Installation is now complete.
2.4 Start-Up Procedures
1. Ensure that all valves on the Essentials™ Gas Sampler and sample cylinder are closed.
2. Pressurize the pipeline.
Testing the Essentials™ Gas Sampler
3. Open product inlet valve A on the sample probe (Figure 1 or Figure 2). Check for leaks and repair as necessary.
4. Verify that the outlet pressure gauge reads zero (0) psig (Figure 1 or Figure 2). This reading indicates that the inline relief
is holding and that sample cannot flow to the sample cylinder. If the inline relief does not need to be adjusted,
continue to step 5. If the inline relief requires adjustment, proceed to Section 3.3, Adjusting the Inline Relief.

The inline relief comes factory-set to 1100 psig. The inline relief should not require adjustment unless pipeline pressure drops
below 400 psig or maintenance is performed on the inline relief.

When sampling into a Welker SC Single Cavity Cylinder, the pressure gauge should read 0 psig at start-up.

5. Verify the setting of the regulator. The regulator should be set to approximately 50 psig.
6. Open purge valve B and the inlet valve on the sample cylinder (Figure 1 or Figure 2). Check for leaks and repair as
necessary.
7. Close purge valve B and the inlet valve on the sample cylinder (Figure 1 or Figure 2).
13 IOM-222 MODEL: ESSENTIALS™ GAS SAMPLER REV: A 13839 West Bellfort Street, Sugar Land, TX 77498 welker.com Service Department 281.491.2331

8. Using a flat head screwdriver, press and release the solenoid test button eight to ten (8–10) times to actuate the MPS-2
and build pressure (Figure 9). With each actuation, a slight pressure increase should be observable on the outlet
pressure gauge.
Figure 9: Solenoid Diagram
Do not leave the solenoid test button in the locked position, as this will prevent the controller from actuating the solenoid.
Do not actuate the solenoid too rapidly, as it requires enough time to actuate and reset.
9. Open purge valve B and allow the MPS-2 to build pressure (Figure 1 or Figure 2).
10. Once pressure on the outlet pressure gauge has risen to pipeline pressure, close purge valve B (Figure 1 or Figure 2).
11. Using a flat head screwdriver, press and release the solenoid test button every 5 seconds to actuate the MPS-2 and
build pressure (Figure 9). With each actuation, a pressure increase should be observable on the outlet pressure gauge.
12. If pressure is holding, continue to step 13. If pressure has dropped, check for leaks and repair as necessary. If an
increase in pressure is observed without manually actuating the solenoid, the inline relief may need to be adjusted;
proceed to Section 3.3, Adjusting the Inline Relief. If pressure has increased up to pipeline pressure without actuating
the solenoid, the O-ring in the inline relief may have failed; proceed to Section 3.2, Maintenance.
13. Open the outlet valve on the sample cylinder to relieve test pressure, and then close the outlet valve.
14 IOM-222 MODEL: ESSENTIALS™ GAS SAMPLER REV: A 13839 West Bellfort Street, Sugar Land, TX 77498 welker.com Service Department 281.491.2331

Purging the Sample Cylinder

Welker recommends that the sample cylinder be cleaned or purged prior to each sample batch to remove any air and/or old
product from the system and prevent cross-contamination between samples.

14. Purge the sample cylinder using the fill and empty method or the continuous purge method as described in Gas
Processors Association (GPA) Standard 2166-86, Obtaining Natural Gas Samples for Analysis by Gas Chromatography.
15. Once the sample cylinder has been purged using the chosen method, ensure that there is no pressure in the sample
cylinder and that the outlet valve on the sample cylinder and purge valve B are closed.
Preparing for Sampling
16. As necessary, program the Welker 6Tc Timer/Controller (Figure 2). Refer to the Installation, Operation, and Maintenance
(IOM) Manual for the 6Tc for instructions on setting the 6Tc.
17. As necessary, set the PLC to the desired sampling frequency based on the sampling actuation equations provided
(Figure 10).

Figure 10: Gas Sampling Equations

Note that the sample volume of the Essentials™ Gas Sampler is 0.25 cc.

18. Prior to beginning sampling procedures, ensure that purge valve B is closed and that the sample cylinder is empty.
19. The Essentials™ Gas Sampler is now operational.
15 IOM-222 MODEL: ESSENTIALS™ GAS SAMPLER REV: A 13839 West Bellfort Street, Sugar Land, TX 77498 welker.com Service Department 281.491.2331

2.5 Sampling Procedures
1. Ensure that the outlet pressure gauge reads zero (0) psig (Figure 1 or Figure 2). As necessary, open purge valve B to
relieve test pressure.
2. Ensure that purge valve B is closed (Figure 1 or Figure 2).
3. Ensure that the inlet valve on the sample cylinder is open and that the outlet valve on the sample cylinder is closed.
4. Close the enclosure door and secure it using the clasps.
5. Activate the controller to begin sampling.
6. Continue sampling until the desired volume of sample has been obtained.
Removing the Sample Cylinder
7. De-energize the solenoid to stop actuating the MPS-2 and halt sampling.
8. Close the inlet valve on the sample cylinder.
9. Loosen the tube fitting on the inlet of the sample cylinder to allow the trapped gas to vent, and then tighten the tube
fitting.
10. Disconnect the sample cylinder from the sample outlet.
11. Tag the samplecylinder and prepare it for transportation to the testing laboratory in accordance with company policy.
16 IOM-222 MODEL: ESSENTIALS™ GAS SAMPLER REV: A 13839 West Bellfort Street, Sugar Land, TX 77498 welker.com Service Department 281.491.2331

3.1 Before You Begin
1. Welker recommends that the unit have standard maintenance every year or after 15,6000–24,000 strokes
under normal operating conditions. In cases of severe service, dirty conditions, excessive usage, or other unique
applications that may lead to excess wear on the unit, a more frequent maintenance schedule may be appropriate.
2. Prior to maintenance or disassembly of the unit, it is advisable to have a repair kit available for repairs of the system in
case of unexpected wear or faulty seals.

New seals supplied in spare parts kits should be lightly lubricated before being installed to ease the installation of the seals and
reduce the risk of damage when positioning them on parts. Wipe excess lubricant from the seals, as it may adversely affect
analytical instrument results.

For sample-exposed seals, Welker recommends non-hydrocarbon-based lubricants, such as Krytox®.
For non-sample-exposed seals, Welker recommends either non-hydrocarbon-based lubricants or silicone-based lubricants, such
as Molykote® 111.

After the seals are installed, the outer diameter of shafts and inner diameter of cylinders may be lubricated to allow smooth
transition of parts.

3. All maintenance and cleaning of the unit should be performed on a smooth, clean surface.
4. Welker recommends having the following tools available for maintenance. Please note that the exact tools required may
vary by model.
a. Adjustable Wrench
b. Hex Key Set
c. Seal Pick
SECTION 3: MAINTENANCE
17 IOM-222 MODEL: ESSENTIALS™ GAS SAMPLER REV: A 13839 West Bellfort Street, Sugar Land, TX 77498 welker.com Service Department 281.491.2331

18 IOM-222 MODEL: ESSENTIALS™ GAS SAMPLER REV: A 13839 West Bellfort Street, Sugar Land, TX 77498 welker.com Service Department 281.491.2331
3.2 Maintenance

If maintenance on the valves or probe is required, the Essentials™ Gas Sampler must be isolated from pipeline pressure and
removed from the pipeline before maintenance can be safely performed.


Prior to performing maintenance, the Essentials™ Gas Sampler must be isolated from pipeline pressure. However, the Essentials™
Gas Sampler does NOT need to be removed from the pipeline to perform standard maintenance.

1. Close product inlet valve A and purge valve B to isolate the Essentials™ Gas Sampler from pipeline pressure (Figure 1or
Figure 2).
2. Turn OFF electrical power to the system and carefully remove all electrical connections.
3. Depressurize and disconnect the tubing from all components requiring maintenance.
4. For complete and proper maintenance on system components, refer to their respective Installation, Operation, and
Maintenance (IOM) Manual. A list of components is available in Appendix A, Referenced or Attached Documents, in this
manual.
5. After performing necessary maintenance on system components, reconnect all instrument tubing.
6. Maintenance is now complete. See Section 2.3, Installation, and Section 2.4, Start-Up Procedures, for instructions on
returning the Essentials™ Gas Sampler to operation.

If maintenance is performed on the MPS-2, the inline relief needs to be reset. Welker recommends setting the inline relief to 1100
psig unless pipeline pressure drops below 400 psig. See Section 3.3, Adjusting the Inline Relief, for instructions on setting the inline
relief.
3.3 Adjusting the Inline Relief

The inline relief is designed to allow product to flow in one direction only. Acting as a check valve, the inline relief will ensure
that sample pumped into the sample cylinder cannot flow back to the pipeline even if pipeline pressure drops.

The inline relief comes factory-set to 1100 psig. The inline relief should not require adjustment unless pipeline pressure drops
below 400 psig or maintenance is performed on the inline relief.

To increase spring tension and raise the relief set point, turn the spring adjuster clockwise.
To decrease spring tension and lower the relief set point, turn the spring adjuster counterclockwise.

Each full clockwise turn of the spring adjuster increases spring tension approximately 100 psig.


19 IOM-222 MODEL: ESSENTIALS™ GAS SAMPLER REV: A 13839 West Bellfort Street, Sugar Land, TX 77498 welker.com Service Department 281.491.2331
When sampling into a Welker SC Single Cavity Cylinder, the inline relief must be set to approximately 100 psig above pipeline
pressure.

If the inline relief will be adjusted using pipeline product, continue to step 1.
If the inline relief will be adjusted using an auxiliary gas supply, proceed to step 9.

Figure 11: Inline Relief Adjustment Diagram
Using Pipeline Gas
1. Close product inlet valve A and depressurize the Essentials™ Gas Sampler (Figure 1 or Figure 2).
2. Disconnect tubing from the outlet of the MPS-2.
3. Open product inlet valve A to pressurize the Essentials™ Gas Sampler (Figure 1 or Figure 2).
4. If pressure is leaking past the inline relief, insert an L-shaped hex key through the relief cap, and then turn the spring
adjuster clockwise until no gas bleeds through.
5. Turn the spring adjuster counterclockwise until some gas bleeds through.
6. Turn the spring adjuster clockwise until no gas bleeds through, and then turn the spring adjuster clockwise another full
turn.

Ensure that at least half a turn remains on the spring adjuster, as too much tension will prevent the spring from contracting and
releasing when the MPS-2 is actuated. To ensure at least half a turn remains on the spring adjuster, Welker recommends turning
the spring adjuster clockwise and counting each turn until the spring adjuster can no longer be turned; the spring adjuster can
then be turned counterclockwise the appropriate number of turns.

7. Verify that the outlet pressure gauge reads zero (0) psig. This reading indicates that the inline relief is holding and that
sample cannot flow to the sample cylinder. If the outlet pressure gauge reads partial pressure, the inline relief requires
further adjustment; return to step 4. If the outlet pressure gauges reads pipeline pressure, purge valve B and/or the
inline relief requires maintenance; see Section 3.2, Maintenance, for instructions on maintaining the inline relief.
8. Reconnect the tubing to the outlet of the MPS-2.

20 IOM-222 MODEL: ESSENTIALS™ GAS SAMPLER REV: A 13839 West Bellfort Street, Sugar Land, TX 77498 welker.com Service Department 281.491.2331
Using Auxiliary Gas
9. Ensure that a sample cylinder is installed to the Essentials™ Gas Sampler.
10. Remove the tubing connection on top of the gauge assembly (Figure 3).
11. Connect a customer-supplied auxiliary gas supply to the elbow on top of the gauge assembly.
12. Close product inlet valve A (Figure 1 or Figure 2).
13. Disconnect the tubing from the outlet of the MPS-2.
14. Open purge valve B (Figure 1 or Figure 2).
15. Adjust the auxiliary gas supply pressure to the desired inline relief setting, and then open the supply. This will
pressurize the Essentials™ Gas Sampler.
16. If pressure is leaking past the inline relief, insert an L-shaped hey key through the relief cap, and then turn the spring
adjuster clockwise until no gas bleeds through.
17. Turn the spring adjuster counterclockwise until some gas bleeds through.

Ensure that at least half a turn remains on the spring adjuster, as too much tension will prevent the spring from contracting and
releasing when the MPS-2 is actuated. To ensure at least half a turn remains on the spring adjuster, Welker recommends turning
the spring adjuster clockwise and counting each turn until the spring adjuster can no longer be turned; the spring adjuster can
then be turned counterclockwise the appropriate number of turns.

18. Turn the spring adjuster clockwise until no gas bleeds through.
19. Verify that the outlet pressure gauge reads zero (0) psig. This reading indicates that the inline relief is holding and that
sample cannot flow to the sample cylinder. If the outlet pressure gauge reads partial pressure, the inline relief requires
further adjustment; return to step 16.
20. Reconnect the tubing to the outlet of the MPS-2.
21. Disconnect the customer-supplied auxiliary gas supply from the elbow on top of the gauge assembly, and then
reconnect the tubing connection (Figure 3).