Bulk Solid Samplers for Representative Dry Material Sampling

Improve Sample Accuracy | Automate Quality Control | Increase Process Confidence

We help identify and implement the right Sentry bulk solid sampling solution for powders, pellets, granules, seeds, flakes, grains, and other dry bulk materials. From gravity chutes and hoppers to screw conveyors, drag conveyors, and pneumatic conveying systems, Sentry samplers deliver representative samples that improve quality control and process reliability.

Get a Bulk Solids Sampling Recommendation

Automatic and manual bulk solid samplers for powders, granules, pellets, grains, plastics, food ingredients, chemicals, minerals, cement, agriculture, and dry bulk material handling applications.

Sentry Model RB Sampler

Take a strip sample and convey it out with an auger.

Discuss My Application Download Product PDF Technical Information

Take a strip sample and convey it out with an auger.

Does the material need help travelling from the probe to the container?

The Sentry RB moves a sample tube through the product flow while a motor-driven auger carries the collected material to the discharge point. Sentry offers this strip-sampling design for suitable free-flowing and non-free-flowing dry materials.

Typical application
Review a powder stream where gravity transfer through a sample tube is unreliable.

Also known as: Automatic strip sampler, retracting auger sampler, bulk-powder sampler.

What this sampler can help you do

Add positive sample transfer

The auger moves collected material toward the discharge point.

Sample across the stream

Review the strip method where segregation makes point sampling less suitable.

Retract the probe

The tube withdraws from the line between sampling cycles.

How the sampling cycle works

Move through the flow

A pneumatic cylinder inserts the sample tube into the product stream.

Convey the collected material

The auger runs while the tube collects the sample.

Discharge and retract

Material exits to the collection point and the probe returns out of the line.

Materials & industries to review

Food powders & flour

Review flow behaviour, cohesion, moisture, and whether the auger transfers the sample consistently.

Granules, flakes & pellets

Check aperture clearance and assess any risk of attrition during transfer.

Chemical & mineral products

Discuss non-free-flowing dry materials, abrasion, adhesion, and the correct contact and seal materials.

Sampling-method overview

Understand the sampling method before selecting the RB

Sentry’s official solid-and-powder range overview provides context for comparing sampling methods. The RB’s retracting tube and auger arrangement should then be reviewed against the specification sheet. This is not a dedicated RB video.

Watch on Sentry Equipment’s official YouTube channel

Review the sampling point and collection path

Confirm why the material needs an auger rather than gravity transfer alone. Include cohesion, build-up, and fragility in the review, then check whether the tube and sample route can be accessed between products.

Dimensional inspection of a Sentry bulk-solids sampler component — Sentry manufacturing: dimensional inspection of a bulk-solids sampler component. Photo: Sentry Equipment.

Document your material properties, process conditions, and required sample quantity with Sentry’s application worksheet.

Open Application Worksheet PDF

Configuration & selection

Sampling method: Retracting strip sampler with motor-driven auger transfer.
Process location: Gravity chutes, bins, hoppers, and suitable dilute-phase pneumatic conveying systems.
Published particle range: 10 µm to 6 mm for the standard arrangement.
Stroke options: 102, 152, or 203 mm (4, 6, or 8 in).
Utilities & layout: Review compressed air, motor electrical supply, stroke clearance, discharge route, and maintenance access.

Options to discuss with RTS

Stroke and custom mounting adapter
Sample-tube purge or exterior purge ring
Release coating or QPQ hardening
Stainless housing and rails
Motor arrangements for the site requirements
Pre-plumbed air preparation, containers, and controller

Send a line sketch, material description, particle-size range, bulk density, flow rate, pressure or vacuum, temperature, and cleaning requirements. Include the sample quantity, collection interval, and laboratory test you need to support.

Review My Sampling Requirements

Questions to settle before selection

Does the auger eliminate the need for cleaning?

No. Sentry describes close auger-to-tube clearances that help reduce retained material. Changeover, allergen, contamination, and maintenance requirements still need an application-specific cleaning procedure.

How often should we take a sample?

Base the plan on the lot or batch, how the material varies over time, the test method, and the required composite quantity. Share the production pattern and analysis requirements so RTS can review the interval and collection arrangement with Sentry.

Can the sample be collected automatically?

Discuss sampler controls, the container location, and individual or composite collection. Confirm the controller and any indexing or collection equipment as part of the quotation; those accessories are not assumed to be included.

PDF Literature & Technical Resources

Use the literature to plan the discussion. Final materials, operating limits, controls, mounting, and installation drawings are confirmed for the selected application.

Compare the Sentry sampler range

Conveyor point sampling

Model A Sampler >>

Take repeatable point samples from a conveyor or gravity chute.

Example: Collect routine quality-control increments from a well-mixed dry ingredient stream.

Also known as: Automatic point sampler, conveyor sampler, sliding-gate sampler.

Free-flowing strip sampling

Model RX Sampler >>

Collect a strip sample across a free-flowing material stream.

Example: Review a flour, granular ingredient, grain, or seed stream where segregation could bias a point sample.

Also known as: Automatic strip sampler, retracting-tube sampler, pneumatic-line sampler.

Gravity-flow point sampling

Model RPG Sampler >>

Automate point sampling from a gravity chute or hopper.

Example: Take scheduled increments from a well-mixed granular ingredient leaving a hopper.

Also known as: Automatic point sampler, rotating-chamber sampler, gravity-chute sampler.

Retracting strip sampling with an auger

Model RB Sampler >>

Take a strip sample and convey it out with an auger.

Example: Review a powder stream where gravity transfer through a sample tube is unreliable.

Also known as: Automatic strip sampler, retracting auger sampler, bulk-powder sampler.

Low-height strip sampling

Model D2 Sampler >>

Sample across a gravity stream with a rotating slotted tube.

Example: Review a gravity chute carrying powder, granules, or suitable kibble where material can segregate.

Also known as: Automatic strip sampler, slotted-tube sampler, D2 SSD sampler.

Fixed-volume point sampling

ISOLOK SAK Sampler >>

Collect fixed-volume increments of powder, flakes, or granules.

Example: Build a composite sample from repeated increments of suitable salt, cement, fertilizer, or food product.

Also known as: ISOLOK automatic point sampler, fixed-volume sampler, plunger sampler.