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Anti-Blocking Pressure Sampling Device
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Anti-Blocking Pressure Sampling Device
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The Anti-Blocking Pressure Sampling Device is designed for pressure and differential pressure measurement in air ducts, flue gas ducts, boiler systems, dust collectors, bag filters, and dusty gas pipelines. It is commonly used with differential pressure transmitters, micro differential pressure transmitters, wind pressure transmitters, and pressure transmitters.
Also known as an anti-clogging pressure sampling device, wind pressure sampling device, differential pressure sampling device, or flue gas pressure sampling device, it helps extract a stable pressure signal while reducing the risk of blockage caused by dust, ash, particles, condensate, or sticky deposits.
The Anti-Blocking Pressure Sampling Device is a pressure take-off accessory used in dusty gas, flue gas, ventilation, and industrial air duct systems. It is installed at the pressure measuring point to guide the pressure signal from the duct or pipeline to a pressure instrument.
In many industrial sites, especially in boiler flue gas ducts, dust collector systems, bag filter systems, cement plant ducts, power plant air ducts, and furnace draft systems, ordinary impulse lines or small pressure taps are easily blocked by dust, ash, particles, or condensate.
This device provides a more reliable pressure sampling structure and helps reduce clogging at the measuring point. It is normally used together with:
For differential pressure measurement, two sampling devices are usually installed: one for the high-pressure side and one for the low-pressure side.
An anti-blocking pressure sampling device is not the transmitter itself. It is the front-end pressure take-off device installed on a duct, flue, pipeline, or equipment wall.
Its function is to obtain the pressure signal from the process while reducing the chance of blockage. The pressure signal is then transmitted through an impulse line to a differential pressure transmitter or pressure measuring instrument.
This product is especially useful in applications where the measured gas contains:
Compared with a simple small pressure tapping hole, the anti-blocking pressure sampling device usually provides a larger sampling chamber, better drainage or purge access, and a more practical structure for maintenance. Some designs can be equipped with valves for isolation, cleaning, or purge air connection.
Typical installation for pressure measurement:
Duct / Flue Gas Pipeline → Anti-Blocking Pressure Sampling Device → Impulse Line → Pressure Transmitter
Typical installation for differential pressure measurement:
High Pressure Sampling Point → Anti-Blocking Pressure Sampling Device → HP Impulse Line → Differential Pressure Transmitter
Low Pressure Sampling Point → Anti-Blocking Pressure Sampling Device → LP Impulse Line → Differential Pressure Transmitter
This product may be described by different names depending on the application and industry:
| Common Name | Typical Meaning |
|---|---|
| Anti-Blocking Pressure Sampling Device | General product name for anti-clogging pressure take-off |
| Anti-Clogging Pressure Sampling Device | Same meaning, more natural in some markets |
| Wind Pressure Sampling Device | Used for air duct and ventilation pressure measurement |
| Differential Pressure Sampling Device | Used with differential pressure transmitters |
| Flue Gas Pressure Sampling Device | Used in boiler, furnace, and flue gas ducts |
| Anti-Blocking Pressure Tap | Anti-clogging pressure take-off point |
| Anti-Clogging Pressure Tap | Pressure tap designed to reduce blockage |
| Air Duct Pressure Sampling Probe | Used in air ducts and HVAC/ventilation systems |
| Flue Gas Pressure Sampling Probe | Used in dusty or hot flue gas applications |
The main function is to reduce blockage at the pressure sampling point. It is more suitable than a small pressure tap when measuring dusty gas, flue gas, or powder-containing air.
A reliable pressure take-off point helps the transmitter receive a more stable pressure signal, improving the reliability of pressure or differential pressure measurement.
By reducing dust and particles entering the impulse line, the device helps protect differential pressure transmitters and reduces maintenance caused by impulse line blockage.
Many anti-blocking sampling devices can be connected with purge air, blowback lines, drain valves, or cleaning valves. This makes it easier to clear dust or condensate without removing the entire instrument system.
The device is useful in flue gas, air duct, furnace, dust collector, and other systems where the pressure medium is not clean.
Suitable for air, flue gas, exhaust gas, furnace gas, and industrial gas containing dust, particles, or ash.
Commonly installed as the pressure take-off device for DP transmitters, especially in wind pressure, furnace draft, duct pressure, and filter differential pressure measurement.
Compared with a standard pressure tap, the structure is designed to reduce dust accumulation and blockage at the measuring point.
Can be used with purge air or cleaning connections to remove dust, particles, or condensate from the sampling path.
Depending on site requirements, the device can be supplied with flange, thread, welded connection, or customized mounting structure.
Available in SS304, SS316, SS316L, or customized materials according to the gas composition, temperature, corrosion level, and site environment.
| Item | Specification |
|---|---|
| Product Name | Anti-Blocking Pressure Sampling Device |
| Brand | SIYelectric |
| Also Called | Anti-Clogging Pressure Sampling Device, Wind Pressure Sampling Device, Differential Pressure Sampling Device |
| Suitable Instruments | Differential Pressure Transmitter, Micro DP Transmitter, Wind Pressure Transmitter, Pressure Transmitter |
| Main Function | Pressure sampling, anti-blocking pressure take-off, differential pressure signal collection |
| Typical Media | Air, flue gas, dusty gas, exhaust gas, furnace gas, powder-containing gas |
| Material Options | SS304, SS316, SS316L, Carbon Steel, or Customized |
| Installation Type | Flanged, Threaded, Welded, or Customized |
| Optional Accessories | Ball Valve, Needle Valve, Purge Valve, Drain Valve, Impulse Line |
| Typical Applications | Air duct, flue gas duct, boiler, dust collector, bag filter, furnace, ventilation system |
| Customization | Length, flange size, thread size, purge port, valve connection, material |
The device is widely used with differential pressure transmitters to measure pressure difference between two points in dusty air or flue gas systems.
Typical examples include:
Used in air ducts, ventilation systems, forced draft fan systems, induced draft fan systems, and HVAC-related industrial ductwork to measure wind pressure or micro differential pressure.
Suitable for boiler flue gas ducts, furnace exhaust lines, desulfurization systems, denitrification systems, chimney ducts, and power plant flue gas monitoring points.
Used to measure differential pressure across filters, filter bags, dust collectors, and air cleaning equipment. It helps reduce the risk of pressure tap blockage caused by dust accumulation.
Applied in boiler air ducts, furnace draft systems, economizer sections, air preheaters, flue gas ducts, and induced draft fan systems.
Suitable for pressure sampling in cement plants, powder conveying systems, sintering systems, lime kilns, metallurgical furnaces, and other dusty gas environments.
Used in exhaust gas pipelines, process ventilation systems, scrubbers, and gas treatment systems where pressure measurement is required but clogging risk is high.
When selecting an anti-blocking pressure sampling device, confirm the following details:
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