Fluid-components-international MT91 Manual General Information User Manual download pdf

Doc. No. 003185 Rev. B 1 - 1

Model MT91 Multipoint Flowmeter

CHAPTER 1 - GENERAL INFORMATION FLUID COMPONENTS INTL

1. General Information

Description

The MT91 is an air and gas mass multipoint flowmeter that incorporates a remote flow element connected to a

microprocessor control and display package (flow transmitter) designed to measure mass flow in ducts, stacks, or

places where irregular flow may reduce the accuracy of single point metering. The MT91 measures mass flow from

up to 16 different sensing points. An average of all individual flow signals produces an output signal representing

total mass flow. The MT91 can be factory calibrated to sense a range of mass flow from 0.25 SFPS to 150 SFPS in

air at standard temperature and pressure (70°F at 14.7 PSIA).

Flow Element

The flow element holds all of the individual sensing points. Each sensing point consists of two pairs of thermowells

of the same size and shape (see Figure 1-1). One thermowell pair contains a heater and an active Resistance

Temperature Detector (RTD). The second pair contains the reference RTD and a thermal mass equalizer.

Figure 1-1. Flow Element Cutaway View of One Sensing Point

Flow Transmitter

The flow transmitter assembly provides power for the flow element, measure the Temperature Differential (DT)

between the active and reference sensors for each individual sensing point, and averages all flow signals to one

output signal. Available outputs options are field programmable to select 4-20 mA, 0-10 Vdc, 0-5 Vdc, digital, with

relay output signals. Three serial communication ports, EIA-232C (RS-232C), EIA-422 (RS-422), or EIA-485

(RS-485), are also field selectable and programmable for output signals. Parameters are programmable using the

keypad or serial communication interface. See Figure 1-2.

Keyboard

Input

Display

Output

Sensor

Excitation

Sensor

Data

Acquisition

Analog

Input

Serial

Interface

RS-232C

RS-422

RS-485

Analog Output

4-20mA

0-10 Vdc

1-5 Vdc

Relay Output

Parameter

Alarms

MT91 Microprocessor

Serial

EEPROM

C00226-1

MT91 Transmitter Keypad and Display Package

Figure 1-2. Functional Block Diagram

1 2

Summary of Contents

Page 1 - 1. General Information

Doc. No. 003185 Rev. B 1 - 1 Model MT91 Multipoint FlowmeterCHAPTER 1 - GENERAL INFORMATION FLUID COMPONENTS INTL1. General InformationDescrip

Page 2 - Specifications

FLUID COMPONENTS INTL CHAPTER 1 - GENERAL INFORMATIONModel MT91 Multipoint Flowmeter 1 - 2 Doc. No. 003185 Rev. BTheory of OperationThe flow element

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