ULTRAC STK Stack Flow Sensor
Applications
The ULTRAC Stack Flow Sensor (STK) or Static Pressure Sensor provides a highly accurate, dependable flow or static pressure measurement of gas flow in smokestacks, gas flues, ducts, and similar conduits.
Designed for complete installation from outside the duct, this insertiontype sensor is more economical than measuring stations which feature a flanged section of duct.
The sensor is particularly effective at gas measurement of dirt-filled, sooty or similar solid-bearing flows when installed with ULTRATECH'S purge-type flow or pressure transmitter systems.
This simple, trouble-free flow measuring device offers a superior means of gas flow measurement, unaffected by static pressure, ordinary solids accumulation, shock, or vibration.
Gas velocities often vary significantly across a stack or duct. Because single-point flow measuring devices read the velocity at one point only, errors in flow measurement are common. The STK Pitot and static pressure measuring points are distributed for equal-area averaging of flows, resulting in improved accuracy and reliability.
Description
The ULTRAC STK Sensor is a highly specialized derivation of the singleaxis, Pitot-averaging, static pressure sensor. Kiel shrouds enclosing the Pitot-static sensors compensate for non-axial flow components. Extraneous tubing around the sensing points is eliminated resulting in an excellent resistance to the build-up of dust and solids on the sensors.
The sensors may be track-mounted for easy removal during cleaning. When dual sensors are installed on opposing sides of a stack, one sensor may be removed for cleaning while maintaining a continuous flow reading.
The STK is available in rigid copper (standard), 304, 316, or almost any type of exotic stainless steels available as required by process conditions.
The fan inlet sensor, model STK-LI features two interconnected STK traverse probes with adjustable mounting feet. This provides accurate measurement of airflow at the inlet of fans.
The static pressure sensor, model STK-LP includes only the static pressure tube with multiple, Fecheimer-type sensors. It's an excellent selection for static pressure measurement for control in VAV systems.
Specifications for ULTRA STK
ACCURACY: +/-2% with recommended quantity of sensors. +/-2% for static pressure only units, model STK-LP MAXIMUM TEMPERATURE: 1650°F (304 or 316 stainless steel) 400°F (rigid copper) UNRECOVERED HEAD LOSS: 0.09 in. w.c. at 6000 fpm; 0.01 in. w.c. at 2000 fpm STRAIGHT-RUN REQUIREMENTS: 5 diameters or longest side dimensions STANDARD MATERIAL: Sensor tubing rigid copper, hard-drawn to ANSI H23.1 and ASTM B88 Mounting plate: 12-gauge galvanized steel
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