Flow Level Pressure
High Accuracy Liquid Level Transmitters Achieve SIL 2 Certification
Jan 08 2009
K-Tek (USA) have announced that the AccuTrak AT100 and AccuTrak AT200 high accuracy, magnetostrictive liquid level transmitters have been certified for operation in SIL 2 (Safety Integrity Level 2) environments. The AccuTrak transmitters are the only magnetostrictive transmitters in the industry to be certified to the exacting IEC 61508 safety standard. They help reduce risk at the process measurement level when implementing Safety Instrumented Systems (SIS) in process plant environments, such as chemical plants, refineries, and power plants.
The AccuTrak AT100 is a high accuracy, magnetostrictive level transmitter that can be directly inserted into the medium to be measured; the AccuTrak AT200 is an externally mounted, non-contact transmitter that can be attached to the K-Tek KM26 magnetic level gauge or other magnetic gauges to form a complete level measuring system. Both the AT100 and AT200 feature a modular, dual compartment design that separately houses
wiring and electronics. Field-replaceable terminal components provide added flexibility and accuracy.
AccuTrak transmitters can be used to measure clean or dirty fluids, and total level, interface level, or multiple levels from the same sensor. The transmitters provide accurate level measurements even with
widely varying pressures and temperatures: up to 3000 psi (207 bar) or 800ºF (427ºC).
The AccuTrak AT100 and AT200 transmitters operate on the magnetostrictive principle. A magnetic field around the wire in the transmitter causes a torsional stress wave that propagates at a known velocity. K-Tek ’s patented, piezo ceramic sensor converts the mechanical torsion into a strong electrical return pulse that provides highly reliable measurements, even in harsh environments. The transmitter’s microprocessor-based electronics measure the elapsed time between start and return pulses, and convert the data into an accurate position measurement proportional to the level of the float.
The AccuTrak transmitters are housed in explosionproof, power coated cast aluminum or 316L stainless steel, dual compartment enclosures. A variety of probe materials are available to accommodate many applications.
The standard probe type is 316L Stainless Steel. Options include Alloy 20, Hastelloy C-276, and PFA Jacket over 316L Stainless Steel. The AccuTrak transmitters are FM Approved, CSA Certified, ATEX Certified, and GOST (Russia) Certified. Chinese approvals are available through K-TEK¹s local offices in Tianjin.
The AccuTrak magnetostrictive level transmitters are available with two-wire, intrinsically-safe, loop powered 4-20 mA signal outputs. Optionally available are HART protocol, Foundation Fieldbus, and Honeywell DE for interoperability with a wide range of measurement and control systems. Level and temperature measurements are displayed locally with a built-in, LCD display.
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