281.491.2331 13839 West Bellfort Street Sugar Land, TX
281.491.2331 13839 West Bellfort Street Sugar Land, TX
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inFlow™ ACE Crude Oil Sampler

WELKER > Crude Oil Sampling > Crude Oil Composite Samplers > inFlow™ ACE Crude Oil Sampler

Top of the Line Sample Extractor

When you transmit crude oil, you never know what you’ll have in your line. Variations in product characteristics and batch size and delivery make selecting the right sample extractor a challenge. Take the guesswork out of the equation with the Welker inFlow™ ACE Crude Oil Sampler. This patented main line isokinetic sample extractor covers all conditions you might encounter, whether you’re sampling condensate, crude oil, or other liquid hydrocarbons. With an adjustable insertion length and sample volume, fast sample speeds, shaft and seal protection, purge tube, and optional insertion tool, adapt the inFlow™ ACE to meet your changing needs and maintain sample integrity.

inFlow ACE
API Chapter 8.2
ASTM D4177
ISO 3171
.02 cc
in 2 seconds
Outpacing the Competition

More Sample in Less Time

When you’re sampling short batches, you need a fast, reliable sampler. The inFlow™ ACE gives you the speed and repeatability you need to get the most representative sample possible. Whereas other samplers put out 2 cc in a sample cycle, the inFlow™ ACE is capable of collecting up to 8 cc in 2 seconds*.

*Depending on product viscosity, operating pressure, tubing size, and electronics

At a Moment's Notice

External Sample Volume Adjustment

If you frequently transport product from different customers or storage tanks, changing the sample volume often typically involves removing your sample extractor from the pipeline—a time-consuming, laborious task. With the external adjustment, you can quickly change the sample volume of the inFlow™ ACE without interrupting normal operations, no collection head disassembly required.

External Adjustment
Piston Motor
Power Up

Double-Acting Piston Motor

The inFlow™ ACE is a reciprocating positive displacement probe sampler. The pumping power of the piston motor is enough to overcome the reliefs to push the full sample volume through to the container every time. High-viscosity products won’t get left behind—the pneumatic or hydraulic pressure on the piston generates enough force to sample thick oils.

Insertion Style & Length

Insertion Options

Install the inFlow™ ACE to a 2” pipeline isolation valve to insert and retract the shaft without draining your pipeline.


Hands On

When pipeline depressurization isn’t an option, manually insert the inFlow™ ACE against line pressures up to 40 psig. Lower the line pressure to safely retract the inFlow™ ACE.

Insertion Tool

The optional insertion tool ensures safe, smooth automatic insertion and retraction of the probe at full pipeline pressure. Remove the insertion tool to use on your other inFlow™ ACE samplers or leave it attached to the installed unit without adding bulk.

It's What's On the Inside That Counts

Clearing the Way

Contamination Prevention

Plug & Purge

A complete composite sample is key to sample representativeness and cross-contamination prevention. The inFlow™ ACE comes standard with a Welker Purge Tube, which allows you to purge trapped liquid product from the collection head to the sample container. Be assured your composite sample is representative of the entire batch and that no samples remain to contaminate subsequent batches. Achieve a proper purge and automate the purge process with a Welker Plug & Purge™ Automatic Purging System.

Inner Strength

Improved Shaft Integrity

Made from 316/316L stainless steel solid bar, the inner shaft reinforces the strength of the inFlow™ ACE. The proprietary S9 coating won’t crack or break, even under the harshest of conditions. This added protection from basic sediment and water (BS&W) extends seal life.

Buffer Zone

BS&W Protection

The Welker Great Barrier Sealant™ filling the outer shaft of the inFlow™ ACE keeps the sample extractor stroking smoothly for longer. Trapped between seals, this lubricant sealant prevents crude oil from entering the outer shaft and protects the primary seals from wear caused by basic sediment and water (BS&W).

Different Strokes

Piston-Style Collection Heads

D-Style Collection Head

0.5–10 cc

The standard collection head offers a wide adjustable sample volume range to cover a variety of sample batch sizes and frequency. Adjust the sample volume and actuation speed as necessary. Use the Welker Checkpoint™ Sample Bite Verification Panel to confirm your collection head setting and actual grab volume.

C-Style Collection Head

3–24 cc

If you need an even larger sample volume range, the C-Style Collection Head is the option for you. Set your inFlow™ ACE from 3–24 cc to suit your sampling requirements. Capable of collecting such large sample grabs, the C-Head is a fitting choice for sampling small volume batches delivered at high flow rates. Use the Welker Checkpoint™ Sample Bite Verification Panel to confirm your collection head setting and actual grab volume.

Point of No Return

Backflow Protection

A companion to the collection head, the inline relief protects sample representativeness during fluctuations in pipeline pressure. Acting as a check valve, the inline relief keeps your samples in the sample container. If pipeline pressure drops, rest assured sample won’t flow from your container back to the pipeline. With the optional sand reliefs, you can sample product containing basic sediment and water (BS&W) without putting extra wear and tear on your sampler.


inFlow ACE Crude Oil Sampler
 inFlow ACE
Materials of Construction316/316L Stainless Steel Wetted Parts, Anodized Aluminum Upper Housing, Carbon Steel Lubricator Body, PTFE, Viton® Wetted Seals, Buna and Viton® Non-Wetted Seals
Pipeline ConnectionSize: 2" (Standard) or 3"
Rating: 150, 300, or 600 ANSI RF
Sample Outlet Connection¼" FNPT
Insertion Length Options24" Manual Insertion With Insertion Tool
Motor Housing Actuation Parts¼" FNPT


³⁄₈" FNPT (Standard)
Insertion Length0–24"
Utility RequirementsHydraulic or Pneumatic Supply for Motor Operation: 100–150 psig
Inert Gas Supply for Purge Operation: ¼" FNPT Connection
Sample VolumeD-Style Collection Head: 0.5–10 cc (Standard)
C-Style Collection Head: 3–24 cc
Maximum Allowable
Insertion/Retraction Pressure
(Manual Insertion)
40 psig
Operating Pressure150 ANSI Carbon Steel: 285 psig @ -20 °F to 100 °F
300 ANSI Carbon Steel: 740 psig @ -20 °F to 100 °F
600 ANSI Carbon Steel: 1480 psig @ -20 °F to 100 °F