Microbiological Environmental Monitoring Products

Surface Microbial Sampler

A sterilizable weighted contact-plate applicator that applies repeatable pressure and timed dwell to flat cleanroom surfaces.

Repeatable Contact Pressure
Timed Surface Application
55 mm Plate Compatibility
Sterilizable Stainless Construction

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Product Introduction

The Surface Microbial Sampler is a precision contact weight used with raised-agar contact plates. Its balanced stainless body seats over a standard plate holder and transfers a controlled vertical load to the agar while a small timer defines the dwell period. A spring-guided plunger helps the operator maintain even contact without rocking the plate or concentrating force at one edge. After sampling, the plate is removed and capped for incubation, leaving the applicator available for cleaning or steam sterilization.

Key Features

A defined weighted load reduces operator-to-operator variation in plate pressure.

The plate-retaining collar centers the contact dish beneath the applicator.

A pull-out timer standardizes the selected contact duration at each location.

Smooth stainless components tolerate repeated cleaning and sterilization.

Customer Product Concerns

Surface recovery varies when operators use different pressure, dwell time or plate angle on the same material.

Hand pressure differs between technicians and sampling rounds.A fixed applicator mass supplies the same nominal load without relying on operator force.

Tilting the plate traps air or contacts only part of the agar dome.A centered collar and guided vertical motion support even face-to-surface contact.

Short or inconsistent dwell time reduces comparability.The integrated timer gives a visible repeatable contact interval.

Complex joints retain disinfectant or surface residue.Removable smooth stainless parts simplify wiping and validated sterilization.

Typical Applications

Cleanroom workbench surfacesIsolator and RABS interiorsWalls, floors and equipment panelsCleaning-process verification

Technical Parameters

Typical construction values for a reusable contact-plate surface sampler are listed below.

Core Material	304 or 316 stainless weighted body with silicone grip and sealed electronic timer
Panel Thickness	55-90 mm weighted body height
Effective Width	55-70 mm contact-plate seat diameter
Maximum Length	Up to 180 mm overall height with plunger extended
Steel Facing Thickness	1.5-3.0 mm stainless outer shell and plate collar
Core Density	7900-8000 kg/m³ for stainless weighted components
Thermal Conductivity	14-17 W/(m·K) for stainless steel components
Surface Finish	Electropolished or fine satin stainless steel with blue silicone grip ring
Joint Type	Removable 55 mm plate-retaining collar with spring-guided plunger and pull-out timer
Customization	Available based on the intended application and operating environment.

Available Options

55 mm contact-plate collarAlternative application weightsDigital dwell timerAutoclavable timer-free configuration

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