Stainless steel instrument test port with threaded sealing cap

Cleanroom Air Distribution Systems

Instrument Test Port for Air Duct

A compact sealed probe access point for repeatable pressure, temperature and airflow measurements without drilling new holes in the duct wall.

Reusable Probe Access
Threaded Sealing Plug
Low-Profile Duct Fitting
Stainless Hygienic Body

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Product Introduction

The instrument test port is a small stainless fitting installed through the duct wall at a defined measurement location. A threaded cap or tethered plug closes the opening between readings, while an elastomer grommet can seal around temporary probes. The flanged base spreads the load across thin sheet metal and is sealed to the external surface. Reusable ports prevent repeated drilling and foil-tape repairs during commissioning, filter checks and routine balancing.

Key Features

A removable threaded plug restores a defined sealed closure after each measurement.

The short smooth bore accepts pitot, pressure, temperature and air-quality probes.

A broad external flange stabilizes the fitting on thin rectangular or round duct walls.

Stainless construction tolerates repeated handling and cleanroom wipe-down chemicals.

Customer Product Concerns

Measurement access must be repeatable and sealed so that routine testing does not leave open holes or adhesive patches in the air path.

Each balancing visit drills another hole through the duct wall.A permanent reusable port provides a single controlled probe location.

Foil tape lifts from a temporary hole and creates unnoticed leakage.A threaded cap and retained gasket form a mechanical closure between tests.

A probe scrapes a sharp raw sheet-metal edge.The smooth port bore protects instrument stems and operator hands.

Small fittings loosen when inserted through thin duct sheet.A wide flange and locked backing nut distribute load and resist rotation.

Typical Applications

Differential-pressure measurementTemperature and humidity samplingPitot-tube airflow traversesFilter pressure checksCommissioning and periodic balancing

Technical Parameters

Typical dimensions and material data for a reusable stainless duct instrument port are listed below.

Core Material	304 stainless steel body with silicone or EPDM sealing element
Panel Thickness	1.0–2.0 mm flange and body wall
Effective Width	8–16 mm clear probe opening
Maximum Length	50–100 mm installed stem length
Steel Facing Thickness	1.0–2.0 mm stainless steel fitting wall
Core Density	Approximately 7900–8000 kg/m³ stainless steel body
Thermal Conductivity	Approximately 14–16 W/(m·K) for 304 stainless steel
Surface Finish	Smooth passivated or brushed stainless steel with color-coded plug option
Joint Type	Threaded plug in flanged bulkhead body with backing nut and perimeter seal
Customization	Available based on the intended application and operating environment.

Available Options

8, 10, 12 or 16 mm probe boreThreaded cap or tethered silicone plugColor-coded pressure-side identificationExtended stem for insulated duct walls

Planning a Instrument Test Port for Air Duct specification?

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