Fluid-components-international FR73B Complete Manual Uživatelský manuál stáhnout pdf

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General Information

FR78B FAST RESPONSE FLOW SWITCH/MONITOR

Installation, Operation and Maintenance Guide

Description

This document explains the operating principle of the Model FR78 Basic Low-Flow Switch/Monitor (see Figure 1). The following

pages also present the recommended procedures for the installation, operation, maintenance, and troubleshooting of the Model FR78B.

The Model FR78B is an instrument that is capable of detecting liquid or gaseous environments. The instrument has field adjustable

alarm set points for control of the media.

Flow Element

The operational part of the flow element consists of two Resistance Temperature Detectors (RTD's) and one low power heater. The

heater is positioned adjacent to the Active RTD and will raise it's temperature above the process ambient while the other RTD

(Reference) will stabilize near the process temperature. This arrangement produces a temperature differential between the two RTDs

that is measured and converted into an analog voltage signal. The temperature differential is greatest when the media is not flowing

(no flow). As the process media begins to flow, forced convection cools the Active RTD and reduces the temperature differential

between the two RTDs.

Control Circuit

The basic functions of the control circuit are to provide power to the flow element, measure the resistance differential (∆R) between the

two RTDs, condition the sensing point signals, and provide relay alarm contacts for customer uses.

A Double Pole Double Throw (DPDT) relay is available in the instrument for connections to the customer alarm systems. The relay

outputs can be set to be either open or closed when the sensing point is at low or no flow and closed or open when the sensing point is

at high flow.

The place where the relays change state will vary depending on the type of media, as well as gas or liquid turbulence. Therefore the

instrument has field adjustable alarm set points.

Figure 1 - FR78B Fast Response Flow Switch/Monitor

1 2 3 4 5 6 ... 19 20

Shrnutí obsahu

Strany 1 - General Information

This page is subject to proprietary rights statement on last pageGeneral InformationFR78B FAST RESPONSE FLOW SWITCH/MONITOR Installation, Operation an

Strany 2

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Strany 4 - Operation

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Strany 5

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Strany 6 - Troubleshooting

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Strany 10 - INTENTIONALLY LEFT BLANK

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Strany 11 - Appendix A - Drawings

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Strany 13 - Appendix B - Glossary

Model FR78B Flow Switch/Monitor FLUID COMPONENTS INTERNATIONAL LLCDoc. No. 06EN003281 Rev. AFluid Components International LLC (FCI) All Rights Reserv

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Strany 15 - Appendix C - Customer Service

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Strany 17 - Fax Cover Sheet

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Strany 18 - RA #___________

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Strany 19 - Instrument Warranty

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Strany 20 - Notice of Proprietary Rights

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