AUTO-purge III

Product Type: Automated High Pressure Air Purge System
Technology Type: Electro-pneumatic system (requires 80 to 120 psig. compressed air)

Reduce maintenance time and cost with clean sensing ports purged automatically with the AUTO-purge III.

Air Monitor’s AUTO-purge III is designed for applications where the continuous exposure to airborne particulate might impair the measurement accuracy of airflow stations or airflow probe arrays. The system can be initiated by a dry contact or the internal timer on an Air Monitor “smart” flow transmitter. Upon activation, the transmitter triggers a high-pressure, high-volume air purge into the flow measurement device’s sensing ports for a short duration while simultaneously isolating the transmitter from over-pressurization. Purge duration and frequency can be adjusted for process specifics. This periodic purging assists in maintaining the sensing ports of the total and static pressure manifolds in a clear unobstructed condition.

Avoid shutdowns from clogged/plugged flow elements
Reduce maintenance time and costs
Improve flow measurement system reliability

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See AUTO-purge III in a Custom Panel

Watch a customer-specific panel walkthrough featuring AUTO-purge III and VELTRON II transmitters. This assembly demonstrates how Air Monitor integrates automatic purging and airflow instrumentation into a custom engineered solution.

Features and Benefits:

Dirty and Particulate-Laden Airflow is no problem. A common challenge with differential pressure type flow measurements (like pitot averaging arrays or multi-point arrays) in dirty or particulate-laden process conditions is the plugging/clogging of the sensing ports. The AUTO-purge III automatically purges the sensing ports at user-selected intervals to clean the flow measurement devices which improves the overall reliability of the system and drives down maintenance cost.
Automatic purging at regular field-selectable intervals. AUTO-purge III utilizes short duration, high pressure (up to 125 psig) air to maintain signal lines and the sensing ports of the total and static pressure manifolds in a clean, unobstructed condition. The automated purge cycle can be programmed at user-selected intervals to achieve the best results for the process conditions.
Purge cycle protection of flow measurement. The last transmitted process outputs are maintained for the purge cycle for consistent flow data collection and smooth flow control.
Transmitter isolation from purge function. Solenoid piloted spool valves isolate the transmitter while the high-pressure purge air forcefully flushes out all particulate matter on the measurement station or probe array.

SPECIFICATIONS

PERFORMANCE SPECIFICATIONS
Power options:	24VAC 24VDC 120VAC
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OPERATING SPECIFICATIONS
Capacity options:	Standard (average ducts) Low-model SP (single probe for small ducts) High-model HP (for large ducts)
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PHYSICAL SPECIFICATIONS
Construction:	Brass and Copper Construction: – All wetted tubing, fittings, and valves constructed of copper and/or brass. – Enclosure is NEMA 4 painted steel – External connection fittings are stainless steel FPT. Stainless Steel Construction: – All wetted tubing, fittings, and valves constructed of 316 stainless steel. – Enclosure is NEMA 4 painted steel. – External connection fittings are stainless steel FPT.
Optional Construction:	-NEMA 4X Stainless Steel Enclosure -Vortex Cooler (requires 80-100 psi air supply) -Enclosure Heater (requires 120VAC power supply) -Viewing window

Applications:

— Combustion Airflow Processes:
- — Power Boilers
- — Combination / Biomass Boilers
- — Recovery Boilers
- — CFBs
- — Fired Heaters
- — Foundry Kilns (Lime, Ceramic, Cement)
- — Thermal Oxidizers
— Dirty Airflow processes:
- — Pneumatic Conveyors
- — CNCG & HVLC
- — Dust Collection Systems
- — Stack Flow Measurement
- — Cement
- — Quench Exhaust
- — Digesters
- — Process air, exhaust gases, pure process gases, flue gas, and pure air

Best in Class Value Proposition:

Industry leading transmitter measurement accuracy for low DP ranges typical of air and gas flow applications.
Shortest straight run requirements in the industry.
Non-uniform flow profile problem solved: highest density of sensing point + patented measurement technology = excellent airflow measurement accuracy.
Dirty applications are no problem with AUTO-purge III feature.
Excellent long-term stability, repeatability, and unmatched accuracy when used with Air Monitor’s family of flow computers featuring AUTO-zero circuitry.
Available field start up services.