PC191 Pneumatic Computing Relaysmy.korcham.net/bbs_new2/files/PC191_1PSS_A_001_en.pdf · 2006. 10....

PC191 Pneumatic Computing Relays

In different areas of process control there are problems which can easily be solved with special pneumatic limit signal,time or computing relays. For instance: signal monitoring, signal selection, signal adaption, safety control, etc.

Computing relays• Booster relay

• Selector relay

• Reversing relay

• Adding relay

• Averaging relay

• Subtraction relay

• Fixed ratio relay

• Square root extractor

• Function generator

Time function relays• Delay relay

• Delay element

• PI-relay

• PD-relay

• Trend relay

Product Specifications 02.99 PSS EIO4332 A-(en)

Computing Relays

Version Function diagram Application Model CodePC191

Booster relay

withoutcalibrationadjustment

A = E Increase in airflow rate

-100

withcalibrationadjustment

-113

Min.-selector relay 2 inputs Input E1, E2 Selection of lowest input pressure -101

Max.-selector relay 2 inputs Input E1, E2 Selection of highest input pressure andsimultaneously increase in airflow rate -102

Reversing relay Input E A = K – EReversal of input pressure signal in

1:1 ratio and simultaneouslyincrease in airflow rate

-110

Adding relay Input E1, E2 A = E1 + E2 – KAddition of two input pressures, minusan adjustable bias value K and simul-

taneously increase in airflow rate-121

Averaging relay Input E1, E2 A = E1 + E22

Averaging and simultaneouslyincrease in airflow rate -130

Subtraction relay Input E1, E2 A = E1 – E2 + KSubstraction of two input pressure, plusan adjustable bias value K and simul-

taneously increase in airflow rate-140

Fixed ratio relay Input E

A = 0.5 E – K Multiplicaton of an input signal by afactor with takes into consideration an

adjustable bias value and simul-taneously increase in airflow rate

-221

A = 0.5 E + K -231

A = 2 E – K -261

A = 3 E – K -281

Square root extractor Input Ex = 0.8 (E – 0.2)

For square root extractionof pneumatic signal

0.2 ... 1 bar -611

3 ... 15 psi -612

Function generator Input EA = f (x) + 0.2 To perform any required

constant function

0.2 ... 1 bar -621

x = 0.8 (E – 0.2) 3 ... 15 psi -622

2 PC191 PSS EIO4332 A-(en)

Time function relays

General Technical DataInput 1) } . . . . . . . . . . . . . 0.2 to 1 bar / 3 to 15 psiOutput 1) / 20 to 100 kPa

max. 6 bar / 90 psi / 600 kPaSupply air . . . . . . . . . . . . . . 1,4 ± 0,1 bar / 20 ± 1,4 psi

/ 140 ± 10 kPa to max. 6 bar /90 psi / 600 kPa

Air consumption 1). . . . . . . . 10 l/hAir delivery 1). . . . . . . . . . . . 3 000 l/h

∆p = 1 barAir exhaust 1) . . . . . . . . . . . 1 800 l/h

Local conditions

Location class . . . . . . . . . . . D1 acc. to IEC 654/1Ambient temperature range. –25 to +70 °CStorage temperature range . –30 to +70 °CAdmissible rel. humidity. . . . ≤ 75 %, no condensation

permissibleProtection class. . . . . . . . . . IP 53 acc. to DIN 40 050

1) Exeptions are outlined

MountingType of mounting . . . . . . . . for wall mounting

with mounting anglesMounting orientation . . . . . . vertical

Pneumatic connections. . . . internal thread 1/8-NPT 2)

Materials

Housing . . . . . . . . . . . . . . . Aluminium, finishInternal components . . . . . . Al, St, Brass, Silicone,

Polyamid, Neopren,Perbunan, PTFE

2) For Tube fittings see Product Specifications PSS EOO9001 A-(en)

Technical data obtained from measurements made under standardreference conditions. Supply air 1.4 bar / 20 psi / 140 kPa.

Version Function diagram Application Model CodePC191

Delay relay symmetrical Delay of signal increase and decay time -900

Delay element (without booster) Passive generation of delay(Restriction and capacity) -913

Delay relay signal increase Delay of signal increase time only -901

Delay relay signal decrease Delay of signal decay time only -902

Pl relay

Combined effect of proportionaland reset action.

Within the period of the reset time Tn,the reset change reaches the

values of the proportional change.

-905

PD relay

Combined effect of derivative andproportional action. On change of input

pressure a transient overshoot ofoutput takes place, followd by

a gradual decay to the new input value.

-910

Trend relay V = 2.5

With a change of input pressure,a transient rise of output pressuretakes place, followed by a gradual

return to the working point of,for instance, 0.6 bar.

-920

A, EE

A

A0

t0 t1 t2

A, EE

A

t

A0

A, E

E

A

t

A0

A, E A

E

tTn

Kp

A, E

t

~ 6a

a

A

E

A, E

t

a

AE2

E1

2.5a

PSS EIO4332 A-(en) PC191 3

Model CodesPneumatic Computing Relay PC191Function and Formula

Booster relay A = E . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . -100Booster relay A = E with calibration adjustment . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . -113Min.-selector relay 2 inputs . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . -101Max.-selector relay 2 inputs . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . -102Reversing relay A = K - E . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . -110Adding relay A = E1 + E2 - K . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . -121Averaging relay A = (E1 + E2) / 2 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . -130Subtraction relay A = E1 - E2 + K . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . -140Fixed ratio relay A = 0.5 E - K . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . -221Fixed ratio relay A = 0.5 E + K . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . -231Fixed ratio relay A = 2 E - K . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . -261Fixed ratio relay A = 3 E - K . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . -281Square root extractor A = A = √ E , 0.2 - 1.0 bar . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . -611Square root extractor A = A = √ E , 3 - 15 psi . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . -612Function generator A = F (E) 0.2 - 1.0 bar . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . -621Function generator A = F (E) 3 - 15 psi . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . -622Delay relay symmetrical . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . -900Delay relay signal increase . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . -901Delay relay signal decrease . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . -902Delay element (without booster) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . -913PI-relay . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . -905PD-relay . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . -910Trend relay V = 2.5 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . -920

Optionsworking on cams with given function (only for -621 / -622) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . -A

Example: PC191 -100

For Tube fittings see Product Specifications PSS EOO9001 A-(en)


Technical dataNon-linearity . . . . . . . . . . . . < 1 %

Functional schematic

Technical dataNon-linearity . . . . . . . . . . . . < 0.25 %


Weight . . . . . . . . . . . . . . . . 0.3 kg

Dimensions 1) Dimensions in mm

Weight . . . . . . . . . . . . . . . . 0.3 kg


1) Dimensional drawing shows tube fittings 1/8-NPT for pipe 6 x 1.These are not supplied with the relays, the tube fittings should beordered separately.

Supply air

Input E

Output A Supply air

E

A

Supply air

E

ASupply air

Input E

Output A

calibration adjustment

K 12.5 % +_

PC191-100 Booster relay without calibration adjustment

PC191-113 Booster relay with calibration adjustment


Technical dataMin. pressure differencebetween E1 and E2 . . . . . . ±4 mbar


Technical dataNon-linearity . . . . . . . . . . . . < 0.25 %Min. pressure differencebetween E1 and E2 . . . . . . ±4 mbar


Weight . . . . . . . . . . . . . . . . 0.3 kg


Weight . . . . . . . . . . . . . . . . 0.5 kg



A

E1

E2

Supply air

E1

E2

A

Supply air

Input E1

Input E2

Output A

PC191-101 Min.-selector relay 2 inputs

PC191-102 Max.-selector relay 2 inputs

Output A

Input E1

Input E2


Technica l dataBias value K . . . . . . . . . . . . mech. continously variable

equivalent to 0 to 1.4 bar/ 0 to 15 psi / 0 to 100 kPa

Functiona l schematic

Technica l dataNon-linearity . . . . . . . . . . . . < ± 1 %Bias value K . . . . . . . . . . . . mech. continously variable


Functiona l schematic

Weight . . . . . . . . . . . . . . . . 0.4 kg


Weight . . . . . . . . . . . . . . . . 0.6 kg



Supply air

Input E

Output A

K

Supply air

E

A

Supply air

E2

E1

A

K

Input E2

Output A

Input E1

Supply air

PC191-110 Reversin g relay A = K – E

PC191-121 Adding relay A = E1 + E2 – K


Technical dataNon-linearity . . . . . . . . . . . . < 1 %


Technical dataNon-linearity . . . . . . . . . . . . < 1 %Bias value K . . . . . . . . . . . . mech. continously variable



Weight . . . . . . . . . . . . . . . . 0.5 kg


Weight . . . . . . . . . . . . . . . . 0.4 kg



E1

Supply air

E2

A

E2

A Supply air

E1

Input E2

Output A

Input E1

Supply air

K

PC191-130 Averaging relay A = (E1 + E2) / 2

PC191-140 Subtraction relay A = E1 – E2 + K

Input E2

Output A

Input E1

Supply air


Technical dataOutput A V · E – KNon-linearity . . . . . . . . . . . . < 1 %Bias value K . . . . . . . . . . . . mech. continously variable


Functional schematicPC191-221A = 0.5 E – K1)

PC191-231A = 0.5 E + K

PC191-261A = 2 E – K

PC191-281A = 3 E – K

1) Relay not usable over full standard signal range2) Basic adjustment

Weight . . . . . . . . . . . . . . . . 0.4 kg



Output A

K

Input E

Supply air

A

E

Supplyair

PC191-221 Fixed ratio relay A = 0.5 E – K 1)

PC191-231 Fixed ratio relay A = 0.5 E + K (K = 0.1 bar) 2)

PC191-261 Fixed ratio relay A = 2 E – K (K = 0.2 bar) 2)

PC191-281 Fixed ratio relay A = 3 E – K (K = 0.4 bar) 2)

Output A

Input E

Supply air

K 0.1 bar

Output A

Input E

Supply air

K 0.2 bar

Output A

Input E

Supply air

K 0.4 bar


PC191-611 ... 622 see page 15

Technical dataAmplification of air outputNon-linearity . . . . . . . . . . . . < 1 %


Function diagram

t0 → t1 (A0 = 0.2 bar)

t1 → t2 (A0 = 1.0 bar)



Function diagram

A0 = initial value

Time settingcontinously variable . . . . . . 0 to 50 min.Weight . . . . . . . . . . . . . . . . 0.5 kg





A = (E A ) (1 e ) A0

-t

0− − +τ

A = (A E) e E0

-t

− +τ

A = (E A (1 e ) A0

-t

0− − +) τ

A

E

Supply air

PC191-900 Delay relay symmetrical

Output A

Input E

Supply air

A, EE

A

A0

t0 t1 t2

PC191-901 Delay relay signal increase

Output A

Input E

Supply air

A

E

Supply air

A, EE

A

t

A0

A0 = initial value




Function diagram

A0 = initial value

Technical dataRestriction and capacity without amplification


Function diagram

t0 → t1 (A0 = 0.2 bar)

t1 → t2 (A0 = 1.0 bar)



Time settingcontinously variable . . . . . . 0.3 kg

Dimensions Dimensions in mm


A = (A E) e E0

-t

− +τ

A = (E A 1 e A0

-t

0− − +) ( )τ

A = (A E) e E0

-t

− +τ

A

E

Output A

Input E

PC191-902 Delay relay signal decrease

Input E

Output A Supply air

PC191-913 Delay element (without booster)

E

A Supply air

A, E

E

A

t

A0

A, EE

A

A0

t0 t1 t2

A0 = initial value


Technical dataWorking point K . . . . . . . . . mechanically adjustableReset time Tn . . . . . . . . . . . 0 to 50 min.Proportional band . . . . . . . . 100 %Initial proport. band . . . . . . . < 1 % referred to 0.8 barTemperature effect . . . . . . . ≤ 0,3 %/10 KSupply air dependency . . . . ≤ 0.1 %/0.1 barAir consumption . . . . . . . . . 10 l/h


Function diagram

Load effect . . . . . . . . . . . . . +3 %(measured at 0.6 bar) for exhausted flow 400 l/h

–3 %for delivered flow 400 l/h

Max. air output . . . . . . . . . . +3 000 l/h∆p = 1 bar–1 800 l/h

Weight . . . . . . . . . . . . . . . . 0.9 kg



F =AE

=K (1

1T p

)

1 +

pn

p

+⋅

τ

E

ASupplyair

PC191-905 Pl relay

Input E

Output A Supply air

K

A, E A

E

tTn

Kp


Technical dataDerivative time Tv . . . . . . . . 0 to 20 min.Differential amplification V . . ca. 6-foldProportional band . . . . . . . . 100 %Error limit . . . . . . . . . . . . . . ≤ 1 % of final valueHysteresis. . . . . . . . . . . . . . ≤ 0.3 %Temperature effect . . . . . . . ≤ 0.3 %/10 KSupply air dependency . . . . ≤ 0.2 %/0.1 barAir consumption . . . . . . . . . 100 l/h


Function diagram




Weight . . . . . . . . . . . . . . . . 0.5 kg



F =AE

=1 T p

11V

T p

V

V

+ ⋅

+ ⋅ ⋅

A = E (V 1) e

V tTV E−

− ⋅+

τ =TVV

PC191-910 PD relay

A

E

Supplyair

Output A

Input E

Supply air

A, E

t

~ 6a

a

A

E


Technical dataTiming restrictor adjustment 0 to 20 min.Amplification V . . . . . . . . . . 2.5-foldError limit . . . . . . . . . . . . . . ≤ 1 % of final valueHysteresis. . . . . . . . . . . . . . ≤ 0.3 %Temperature effect . . . . . . . ≤ 0.5 %/10 KSupply air dependency . . . . ≤ 0.2 %/0.1 barAir consumption . . . . . . . . . 100 l/h


Function diagram

τ = TV




Weight . . . . . . . . . . . . . . . . 0.0 kg



F =AE

=T p

1 T pVV

V

⋅+ ⋅

⋅

A = V E e

tTV⋅ ⋅

−

PC191-920 Trend relay V = 2.5

Input E1

K

Pneumaticworking point E2

Output A Supply air

E1

A

E2

Supplyair

A, E

t

a

AE2

E1

2,5a


Technical dataRelative instrument errorterminal based adjustment . ≤ 0.5 % above 10 % outputHysteresis. . . . . . . . . . . . . . ≤ 0.3 % above 10 % outputSensitivity . . . . . . . . . . . . . . ≤ 0.4 mbarTemperature effect . . . . . . . ≤ 0.2 % / 10 K

(meas. at 50 % output signal)Supply air dependency . . . . ≤ 0.15 % / 0.1 bar

(meas. at 50 % output signal)Air consumption . . . . . . . . . 220 l/h


Function diagram

Square root extractor

A = √ x + 0.2x = 0.8 (E – 0.2)

Function generator

A = f (x) + 0.2x = 0.8 (E – 0.2)

Load effect . . . . . . . . . . . . . + 3 %(measured at 0.6 bar) for exhausted flow 600 l/h


Max. air output . . . . . . . . . . ± 2 000 l/hWeight . . . . . . . . . . . . . . . . 0.4 kg

Am Ausgang ist eine Leitung von mindestens 1,5 m Längevorzusehen.

Dimensions Dimensions in mm

PC191-611 Square root extractor A = √ E , 0.2 - 1 barPC191-612 Square root extractor A = √ E , 3 - 15 psiPC191-621 Function generator A = f (E), 0.2 - 1 barPC191-622 Function generator A = f (E), 3 - 15 psi

Input E

Output A

Supplyair

Depth93.5

Supplyair

A E

Out

put

[bar

]

Input [bar]

0.2

0.4

0.6

0.8

1.0

0.2 0.4 0.6 0.8 1.0

Input [bar]0.2 0.4 0.6 0.8 1.0

Out

put

[bar

]

0.2

0.4

0.6

0.8

1.0


Subject to alterations - reprinting, copying and translation prohibited. Products and publications are normally quo-ted here without reference to existing patents, registered utility models or trademarks. The lack of any such refer-ence does not justify the assumption that a product or symbol is free.

FOXBORO ECKARDT GmbHPostfach 50 03 47D-70333 StuttgartTel. # 49(0)711 502-0Fax # 49(0)711 502-597 DOKT 556 022 023


PC191Computing RelaysTime function relaysGeneral Technical DataModel CodesComputing RelaisBooster relay without calibration adjustmentBooster relay with calibration adjustmentMin.-selector relay 2 inputsMax.-selector relay 2 inputsReversing relay A = K – EAdding relay A = E1 + E2 – KAveraging relay A = (E1 + E2) / 2Subtraction relay A = E1 – E2 + KFixed ratio relay A = 0.5 E – KFixed ratio relay A = 0.5 E + KFixed ratio relay A = 2 E – KFixed ratio relay A = 3 E – KSquare root extractor A = Ö E ,0.2 - 1 barSquare root extractor A = Ö E , 3 -15 psiFunction generator A = f (E), 0.2 - 1 barFunction generator A = f (E), 3 - 15 psi

Time function relaysDelay relay symmetricalDelay relay signal increaseDelay relay signal decreaseDelay element (without booster)Pl relayPD relayTrend relay V = 2.5

Imprint

PC191 Pneumatic Computing Relaysmy.korcham.net/bbs_new2/files/PC191_1PSS_A_001_en.pdf · 2006. 10....

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