AMS releases thermal mass flow meters for flue gas

AMS Instrumentation and Calibration introduces a new rugged flow meter
from Fluid Components International (FCI) designed for applications involving
hot dirty gases.

FCI’s MT91 Series rugged flow meters are ideal for process and plant
engineers responsible for continuous emissions monitoring systems (CEMS) and who
need a reliable solution to flow measurement problems in large ducts with hot
dirty gases. The new flow meters can take the heat and provide precise,
repeatable measurement to meet stringent environmental regulations.

Industries with high temperature operations that emit hot, dirty gases
via large ducts or stacks need accurate flow measurement to report regulatory
compliance. Flue or stack gases present special challenges for single-point
air/gas flow measurement sensing technologies because of their multi-gas
composition, swirling air currents caused by changes in demand, high temperature
or humidity extremes that vary seasonally, and the frequent emission of sticky
or abrasive particulates.

Featuring a smart digital flow transmitter and advanced thermal
dispersion technology flow sensing elements, the MT91 flow meter meets federal
environmental requirements for CEMS per CFR Title 40, Part 75. An excellent
choice for measuring mass flow in any environment where variable conditions
limit single-point flow meter effectiveness, the rugged MT Series multi-point
flow meters from FCI is also suitable for use in harsh environments, in which
temperature, vibration, abrasion and corrosion pose difficulties for other

The MT91 flow meter features a unique multi-point averaging thermal mass
flow sensor design combining FCI’s highly reliable thermal dispersion,
no-moving parts flow element with up to 16 flow sensing points while operating
over a wide temperature range up to 454¡C. The advanced flow sensing element
design measures air or gas mass flow and ensures exceptional accuracy and repeatability
over a wide range of temperatures and environmental conditions.

Key features of the MT91 flow meters include highly stable fully
temperature-compensated flow sensor electronics with almost no drift for
excellent accuracy and repeatability; highly versatile with a wide turndown
range from 5:1 to 100:1 and flow range from 0,08 NMPS to 46 NMPS; measurement
repeatability ±0.5 percent of reading; all-metal flow element featuring a
fouling-immune no-moving-parts design for simple maintenance and long life; and
two platinum RTDs provided in each flow element for temperature and flow

All wetted surfaces are 316 stainless steel with nickel brazed joints
per AMS 4777 (standard) or Hastelloy C-276 as an option. Coating materials such
as electroless nickel plating or chromium carbide are also available. The 316L
stainless steel sensor assembly is available with flanged, threaded and
retractable process connections with an IP66 rated (NEMA/CSA Type 4X) junction
box. The flow element assembly is connected remotely by cable to the
electronics package up to 304m away. Dual 4-20mA analogue outputs of flow rate
and temperature and dual DPDT relays are standard outputs for easy user
interface with DCS, PLC, SCADA, controllers or other recording devices.

The MT91 offers a
smart flow transmitter with a powerful microprocessor-driven design for
superior signal processing and data collection. A user-friendly menu-driven
interface with a large LCD display and keypad for programming the control,
monitoring, display and driver/alarm functions is also provided. A non-volatile
EEPROM chip stores applications and calibration data, and protects this data in
the event of a power disturbance. The MT91 also runs daily operation and
integrity checks and reports its findings to the plant operator to ensure
continuous and correct performance.

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