Company Profile

Flowmeter Air Devices for Plant Pneumatic Automation and Compressed Air Line Audits

Quick Answer: Compressed air lines need dedicated flow measurement. A thermal mass flow meter or vortex flow meter gives direct mass or volume flow data for plant pneumatic automation and compressed air line audits. Send us pipe size (DN), pressure (bar), temperature (°C), and flow range. We reply with a model and price.

Why Compressed Air Flow Data Matters

Most plants run compressed air at 6 to 8 bar. Some lines operate at 12 to 15 bar. Air leaks and branch consumption stay hidden until a line audit is done. A flowmeter installed on the main header shows total plant air use every minute. This data helps you schedule compressors, find leaks, and charge each production cell for compressed air.

A food packaging plant in Australia reduced air waste by 18 percent after installing a DN80 vortex flow meter on a main compressed air header. That baseline came from a two week audit. As a compressed air flow meter manufacturer, Silver Automation Instruments also supplies pressure transmitters and paperless recorders for complete air audit packages.

Meter Types for Compressed Air Lines

For compressed air line audits, two meter types work well. Thermal mass flow meters measure mass flow directly in kg/h or Nm3/h. They handle low flow better than most other devices. Vortex flow meters measure volume flow in m3/h. They are robust for wet or oily air if the condensate is removed.

Silver Automation Instruments supplies both types. We often specify a thermal mass flow meter for DN25 to DN80 branch lines and a vortex flow meter for DN80 to DN200 main headers. This matches the pressure drop limits and turndown needed in most plant pneumatic automation systems.

What a Compressed Air Line Audit Should Record

A compressed air audit without a flowmeter is guesswork. You need flow, pressure, temperature, and sometimes dew point. A standard Silver Instruments vortex meter outputs 4-20 mA HART and includes a PT100 temperature sensor. Pressure transmitters rated to 16 bar or 40 bar sit upstream of the meter. A paperless recorder logs all signals.

One customer in Vietnam used this setup on a DN100 compressed air line for a paint manufacturing plant. They found two leaking branch lines and corrected the issue within one shift. The same audit data supported their ISO 50001 reporting.

Live Line Installation and Pipe Sizes

Many plants avoid compressed air metering because they do not want to shut down production. Here is the thing. Insertion thermal mass flow meters can be installed through a ball valve and hot tap. This works on lines up to 16 bar.

Inline vortex meters need a pipe spool. You can schedule that during a planned shutdown. DN15 and DN25 meters are small enough for local machine air feeds. DN50, DN80, and DN100 meters fit main headers and compressor discharge lines.

Signals, Materials, and Hazardous Area Options

Silver Automation Instruments air flow meters support pulse, 4-20 mA, HART, and RS485 Modbus RTU. Some models offer ATEX Zone 1 or Zone 2 certification for chemical plants and oil and gas applications. The meter body can be 316L stainless steel or aluminum alloy. For compressed air, aluminum is usually enough. For offshore or marine air systems, we supply 316L stainless steel.

Tell us the zone classification, gas group, and temperature class if your site is hazardous. We will match the meter approval to your area.

What an Audit Delivers

The main output is a baseline. A flow meter logs air use for one to two weeks. The data shows night demand, weekend demand, peak demand, and leak load. A customer in Thailand ran a two week audit on a DN150 compressed air line. The baseline showed 22 percent of air use happened during non production hours. Th