77-5053 - rp922a pneumatic potentiometer ?· rp922a pneumatic potentiometer 77-5053 specifications...

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  • RP922A PneumaticPotentiometer

    Copyright 1983 Honeywell Inc. All Rights Reserved 77-5053

    SPECIFICATION DATA

    GENERALThe RP922A is a three-port pneumatic potentiometer. It is amultipurpose device used in control systems for the following:

    Sum of two input pressures Average of two input pressures Adjustable flow restriction Adjustable pressure supply

    FEATURES High efficiency integral filters for all ports High reliability, no internal moving parts Compact size High accuracy

  • 2

    RP922A PNEUMATIC POTENTIOMETER

    77-5053

    SPECIFICATIONSOperating Temperature:39 to 122F 4 to 50C)

    Operating Pressure:0 to 20 psi (0 to 138 kPa)

    Maximum Safe Air Pressure:30 psi (207 kPa)

    Air Connection:5/32 in. (4 mm) push-on barb

    Air Consumption: Sum of two input pressures: none Ratio of two input pressures: none Adjustable flow restriction: none Adjustable pressure supply application: 0.007 scfm

    (0.00331/sec) at 14.5 psi (101 kPa)

    Mounting:Snap-on device rail mounting or mounting on walls or panelswith screws.

    Dimensions:See Figure 1.

    Fig. 1. RP922A dimensions in inches (millimeters).

    TYPICAL OPERATION1. Averaging-Ratio Relay, Summing Relay

    A typical application uses the RP922A to provideaveraging-ratio pressure output. P1 and P3connect to pressure signals and P2 connects to acontroller input port. P2 is a functional output ofP1 and P3 (Fig. 2 and Table 1).

    The RP922A sums the input velocity signals oftwo ducts with different areas to produce a totalflow signal (Fig. 3).

    Fig. 2. Averaging-Ratio relay application.

    Table 1. Ratio pressure at port 2.1

    Ratio Output at P2 Scale Setting

    9-1 9 P1 + P310

    10

    3-1 3 P1 + P34

    25

    2-1 2 P1 + P33

    33

    1-1 P1 + P32

    50 (Averaging)

    1-2 P1 + 2 P33

    67

    1-3 P1 + 3 P34

    75

    1-9 P1 + 9 P310

    90

    1 Idealized Response. Actual response is higher thanthe calculated response by about 5 percent of theP1, P3 difference.

    2. Adjustable Flow Restriction A typical application uses the RP922A to function

    as an adjustable airflow restriction. Thirty percentscale setting is equivalent to an 0.007-inchrestrictor, ninety percent scale setting isequivalent to an 0.005-inch restrictor (Fig. 4).

    3. Adjustable Pressure Supply The RP922A provides an adjustable pressure

    from 10 to 90 percent of the pressure at Port P1(Fig. 5 and Fig. 6).

    The RP922A widens the effective proportionalband of a controller by reducing the sensor inputpressure by a fixed ratio (i.e., at a scale setting of50, controller pb is doubled) (Fig. 7 and Table 1).

    2-7/8(73)

    2-1/2(64)

    2-7/16(62)

    ++

    50 4030

    20

    1090

    8070

    60

    ++

    + +

    C7865

    12

    3

    MM

    SENSORS

    RP922

    INPUT

    CONTROLLER

    1 2 3

    C7859

  • RP922A PNEUMATIC POTENTIOMETER

    3 77-5053

    Fig. 3. Summing relay application.

    Fig. 4. Adjustable flow restrictor application.

    Fig. 5. Adjustable pressure supply application.

    Fig. 6. Output pressure vs scale settings.

    Fig. 7. Adjustable sensor input span application.

    TO TOTAL CFMFLOW SIGNAL

    VELOCITY SIGNAL 1

    VELOCITY SIGNAL 2

    1 2 3

    C7860

    TO CONTROLLED DEVICE

    CONTROL SIGNAL

    INPUT PRESSURE

    1 2 3

    C7861

    DEAD ENDED PORT

    CONTROL SIGNAL

    INPUT PRESSURE

    1 2 3

    C7862

    OU

    TP

    UT

    PE

    RC

    EN

    TA

    GE

    OF

    INP

    UT

    PR

    ES

    SU

    RE

    SCALE SETTINGC7863

    90

    90 20 30 40 50 60 70 80 90

    70

    50

    30

    10

    TO CONTROLLER INPUT(BLOCKED PORT)

    RP970A

    RP922A

    3

    4 1 2

    SENSOR

    1 2 3

    C7864

    M

    M

  • Honeywell Europe S.A.3 Avenue du BourgetB-1140 Brussels Belgium

    Honeywell Asia Pacific Inc.Room 3213-3225Sun Hung Kai CentreNo. 30 Harbour RoadWanchaiHong Kong

    Home and Building ControlHoneywell Limited-Honeywell Limite155 Gordon Baker RoadNorth York, OntarioM2H 2C9

    Honeywell Latin American DivisionMiami Lakes Headquarters14505 Commerce Way Suite 500Miami Lakes FL 33016

    Helping You Control Your World

    77-5053 11-83

    Home and Building ControlHoneywell Inc.Honeywell PlazaP.O. Box 524Minneapolis MN 55408-0524

    Printed in U.S.A. on recycled papercontaining at least 10% post-consumer paper fibers

    By using this Honeywell literature, you agree that Honeywell will have no liability for any damages arising out of your use or modification to, the literature. You will defend and indemnify Honeywell, its affiliates and subsidiaries, from and against any liability, cost, or damages, including attorneys fees, arising out of, or resulting from, any modification to the literature by you.

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