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Grab Sampling Systems

Realiable Solutions Built to Last.

Configurable, Local, Reliable Grab Sampling Panels for Gas and Liquid Service

We offer fully configurable, locally built and supported, and reliable grab sampling assemblies in a variety of configurations with advanced features intended to help you safely capture representative samples of liquid or gas from your process lines. Whether you want closed-loop sampling into pressure-rated sample cylinders or simply want to collect process fluid into lower-cost glass laboratory bottles for analysis, we offer ideal sampling panel options that are safe, intuitive, easy to maintain and can be ordered as a single part number.

Grab Sample Modules (GSM)

The Swagelok® grab sample module (GSM) is a closed-looped sampling system that pulls from a positive-pressure process and returns back to the process at a lower pressure location (e.g., upstream of a pump) by using differential pressure to drive the fluid through the system. Samples are deposited into durable, pressure-rated metal grab sampling cylinders (GSC) that prevent the sample from escaping, protecting operators.

A key feature of the GSM is the switching valve that directs flow. Using the Swagelok 40G series ball valve for this switching valve, configurations are available with either 2 or 3 valves. This allows for simultaneous control of fluid routing, reducing the number of steps required to draw a sample.


Grab Sample Liquid Systems (GSL)

The Swagelok® grab sample liquid (GSL) is a liquid-only sampling system for drawing fluid into a non-pressure-containing bottle with a self-sealing septum cap in applications where the process fluid is not at risk of fractionating when stored at atmospheric pressure.

Swagelok GSL systems use the same switching valve as a GSM system to provide simplified operation for complex tasks. The GSL systems also include Sentry Equipment’s Model MVS to draw a sample into a bottle. GSL systems are assembled with Swagelok tube fittings.

What to Expect When Ordering Grab Sampling Systems

The process of identifying, customizing, and maintaining the right grab sampling solutions for your facilities looks like this:

1. Assess

Our team of sampling specialists can evaluate your current sampling system and assess your needs as necessary. Or if you already have a specification or design in mind, you can skip this step.


2. Recommend

Our team will take you through a checklist of details to help you select a sampling panel that meets your needs. Based on the established parameters, our certified engineer will review your information and recommend the right panel for you. Installation location


3. Configure

Using our standard panel designs as a platform; our certified local engineer works with you to configure the system. This step includes tailoring to your unique needs.


4. Assemble

We take the work of sampling system assembly off your team, fabricating the system, and testing for reliability. Our local technicians, who undergo comprehensive training and certification build your sampling panels, and our certified engineers will monitor each step of the process.


5. Train

Once your grab sample panels are assembled, our Swagelok-certified trainer can provide hands-on training to your technicians on proper use and maintenance.


6. Support

With 100+ local associates, we are equipped to provide an exceptional customer experience.

Your local experts are always one call away.



An Introduction to Grab Sampling

Learn about grab sampling best practices for both gaseous and liquid fluid system media, the characteristics of well-designed and easily operable grab sampling systems, and how to reliably achieve grab sampling accuracy. Read More. 

A white paper by Matt Dixon, Senior Applications Engineer, Swagelok

Need more information, support, or quotation?

Give us a call at 603.8084.1818 or email us.