General; Description; Theory Of Operation; Safety Instructions - FCI MT100 Installation, Operation And Maintenance Manual

MT100 Multipoint Flow Meter
1

GENERAL

Description

The MT100 is a thermal dispersion, industrial process grade air and gas multipoint insertion mass flow meter in a local probe/remote
transmitter configuration. The instrument provides direct mass flow measuring and measures flow rate, totalized flow and temperature. An
average of the individual flow signals (up to eight) gives an output signal that represents the total mass flow. MT100S uses two or more
single-point probe assemblies. MT100M uses one or more mast-style probe assemblies each of which contains two or more flow sensors.
The measurements are made available to the user by way of 4-20 mA analog output channels with digital bus protocol support (HART,
Modbus, F
OUNDATION
range and process description information. There are no moving parts to clean or maintain. It is offered in a wide selection of process
connections to fit with any process piping and versions are available for temperature service from -40 °F [-40 °C] to 850 °F [454 °C] (or for
applications requiring T1/T450°C rating: 689 °F [365 °C]).

Theory of Operation

The instrument functionally is based on the thermal dispersion operating principal. A low powered heater produces a temperature
differential between two resistance temperature detectors (RTDs) by heating one of the RTDs above process temperature. As the process
mass flow rate changes the temperature differential between the RTDs changes as well. The differential temperature between the RTDs is
proportional to the process mass flow. The flow transmitter converts the RTD differential temperature signal into a scaled flow output
signal. The signal from the unheated RTD is used to provide the process temperature value.

Safety Instructions

Warning:
Warning:
● Field wiring shall be in accordance with NEC (ANSI-NFPA 70) or CEC (CSA C22.1) locations as applicable.
● The instrument must be installed, commissioned and maintained by qualified personnel trained in process automation and control
instrumentation. Installation personnel must ensure the instrument has been wired correctly according to the applicable wiring diagram.
● All location specific installation and wiring requirements must be met and maintained. FCI recommends an input power circuit breaker
be installed between the power source and the flow meter. This facilitates easy power disconnection during commissioning and
maintenance procedures. A switch or circuit breaker is required if installation is in a hazardous area.
● The flow meter contains electrostatic discharge (ESD) sensitive devices. Use standard ESD precautions when handling the circuit
board assemblies.
● Hazardous Areas: The instrument is designed for use in hazardous areas. The approved area classification is identified on the
nameplate along with the temperature and pressure limitations.
— The USB port and the Ethernet port do not support the hazardous area requirements and should only be used when the area is
declassified.
— Remove any non-certified parts such as plastic protection caps from cable entry ports and replace by suitable wiring and cabling
system certified by notified bodies for use in Hazardous areas.
— Plug any unused ports with certified hazardous area hardware.
— A portion of the enclosure is non-conducting and, under certain extreme conditions, may generate an ignition-capable level of
electrostatic charges. The user shall ensure that the equipment is not installed in a location where it may be subjected to external
conditions (such as high-pressure steam) which might cause a build-up of electrostatic charges on non-conducting surfaces.
Additionally, cleaning of the equipment should be done only with a damp cloth.
— The installer shall consider the relationship between the temperature code, ambient temperature and process temperature and
ensure that the maximum specified ambient temperature is not exceeded.
Fluid Components International LLC
Fieldbus, or PROFIBUS). The optional graphics display provides real-time process variable values along with flow
Explosion Hazard. Do not disconnect equipment when flammable or combustible atmosphere is present.
Exposure to some chemicals may degrade the sealing properties of the materials used in the following devices:
relays K1 and K2, model American Zettler AZ8-1CH-24DSE. FCI recommends periodic inspections of the relays for
degradation and replace them when degradation occurs.
GENERAL
1