Electronic
Pressure Measurement
General Purpose Pressure Transmitters
with NEMA 4X Integral Junction Box
Models F-20, F-21
Datasheet F-20, F-21
Applications
■ Chemicalindustry
■ Foodindustry
■ Pharmaceuticalindustry
■ Corrosiveenvironments
■ Mechanicalengineering
Special Features
■ Pressurerangesfrom50InWCto15,000psi
■ 4-20mAandvoltagesignaloutputsavailable
■ Compactsizeandruggedconstruction
■ Allstainlesssteeldesign
■ Integralelectricalconnection
Left: F-20 with standard NPT connection
Right: F-21 with flush diaphragm
Description
Compact, rugged design
TheF-2Xseriesofpressuretransmittersaredesignedfor
installationindifficult,corrosiveenvironments.Thesmooth
exteriorsurfacesreduceareaswherecontaminantsmay
collectandmakeitidealforuseinthefoodandpharmaceutical
industrieswherewash-downproceduresforcleanlinessare
required.
TheallstainlesssteelcasemeetsNEMA4Xrequirementsfor
wash-downandcorrosionresistanceandingressprotection
isavailableuptoIP67.
Easily accessible electrical connection
Thesophisticateddesignofthistransmitterprovidesforfast,
easyinstallation.Thejunctionboxcoverunscrewsforaccess
totheinternalspringclipterminalblock.
Datasheet F-20, F-21 1/2011
Additional features
Transmitterswiththe4-20mAoutputsignalincludean
internaltestcircuitconnectionthatpermitsthetransmittertobetestedwithoutdisconnectingtheprimary4-20mA
circuit.ThemodelF-20featuresanall-weldedstainlesssteel
measuringcellforimprovedmediacompatibility.Thereareno
internalsoftsealingmaterialsthatmayreactwiththemedia
ordeteriorateovertime.
ThemodelF-21featuresaflushdiaphragmprocess
connection.Thisflatsensingsurfaceisspecificallydesigned
forthemeasurementofviscousfluidsormediacontaining
solidsthatmayclogtheNPTprocessconnection.
Page 1 of 4
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Specifications
Pressurerange
Maximumpressure*
Burstpressure**
Pressurerange
Maximumpressure*
Burstpressure**
Model F-20 / F-21
50InWC
15psi
29psi
300psi
1,160psi
1,390psi
5psi
29psi
35psi
500psi
1,160psi
5,800psi
10psi
58psi
69psi
1,000psi
1,740psi
7,970psi
25psi
145psi
170psi
2,000psi
4,600psi
14,500psi
30psi
145psi
170psi
3,000psi
7,200psi
17,400psi
{vacuum,gaugepressure,compoundranges,andabsolutepressurereferencesareavailable}
1
2
60psi
240psi
290psi
5,000psi
11,600psi
24,650psi
100psi
500psi
600psi
8,000psi
17,400psi
34,800psi
160psi
1,160psi
1,390psi
10,000psi1
17,400psi
34,800psi
200psi
1,160psi
1,390psi
15,000psi1
21,750psi
43,500psi
RangesonlyavailablewithTypeF-20
ForModelF-21theburstpressureislimitedto21,000psiunlessthepressuresealisaccomplishedbyusingthesealingringunderneaththehex.
*Pressureapplieduptothemaximumratingwillcausenopermanentchangeinspecificationsbutmayleadtozeroandspanshifts
**Exceedingtheburstpressuremayresultindestructionofthetransmitterandpossiblelossofmedia
Materials
nWettedparts
ModelsF-20
ModelsF-21
nCase
Internaltransmissionfluid3)
3)
Signaloutputand
maximumloadRA
Testcircuitsignal/max.loadRA
Adjustabilityzero/span
Responsetime(10...90%)7)
Isolationvoltage
Accuracy5)
Non-linearity
Non-repeatability
1-yearstability
Permissibletemperatureof
nMedium
nAmbient
nStorage
Compensatedtemperaturerange
Temperaturecoefficients(TC)within
compensatedtemperaturerange:
nMeanTCofzero
nMeanTCofrange
CE-conformity
nPressureequipmentdirective
nEMCdirective
Shockresistance
Vibrationresistance
Wiringprotection
Electricalconnection
Weight
NotavailablewithF-20onpressureranges>300psi
Mediatemperatureforoxygenversion:-4...+140°F/-20...+60°C
NotavailableinvacuumandabsolutepressurerangesorwithModelF-21flushdiaphragmversion>500psi
DCV
10<UB≤30(11...30withsignaloutput4...20mA,
14...30withsignaloutput0...10V)
4...20mA,2-wireRA<(UB-11V)/0.02AwithRAinOhmandUBinVolt
0...20mA,3-wireRA<(UB-3V)/0.02AwithRAinOhmandUBinVolt
{0...5V,3-wire}RA>5kOhm,{0...10V,3-wire}RA>10kOhm
Onlyforinstrumentswith4...20mAsignaloutput.RA<15Ohm
%
±5usingpotentiometersinsidetheinstrument
ms
<1
DCV
500
%ofspan
≤0.25{0.125}6)
(BFSL)
%ofspan
≤0.5{0.25}6)(limitpointcalibration)
5)
Includinglinearity,hysteresisandrepeatability.Limitpointcalibrationperformedinverticalmountingposition
withpressureconnectionfacingdown.
6)
Forpressurerangesabove100InWC
%ofspan
≤0.2(BFSL)accordingtoIEC61-298-2
%ofspan
≤0.1
%ofspan
≤0.2
(atreferenceconditions)
4)
PowersupplyUB
(forothermaterialsseeWIKAdiaphragmsealprogram)
Stainlesssteel
Stainlesssteel;O-ring:NBR{Viton®orEPDM}
Stainlesssteel
Syntheticoil{Halocarbon®oilforoxygenapplications}4)
{ListedbyFDAforfoodapplications}
-22...+212°F
{-40...+257°F}7) -30...+100°C
{-40...+125°C}7)
-4...+176°F
{-22...+221°F}
-20...+80°C
{-30...+105°C}
-40...+212°F
-40...+100°C
32...+176°F
0...+80°C
AlsocomplieswithEN50178,Tab.7,TypeC,Class4KHOperation,1K4Storage,1K3Transport
7)
ResponsetimeF-20:<10msatmediumtemperaturesbelow-30°C(-22°F)forpressurerangesupto300psi
ResponsetimeF-21:<10msatmediumtemperaturesbelow-30°C(-22°F)
%ofspan
%ofspan
g
g
lb
≤0.2/10K(<0.4forpressurerange<100InWC)
≤0.2/10K
97/23/EC
89/336/EECemission(classB)andimmunityaccordingtoEN61326
600accordingtoIEC60028-2-27(mechanicalshock)
10accordingtoIEC60068-2-6(vibrationunderresonance)
Protectedagainstreversepolarity,overvoltageandshortcircuiting
Internalspringclipterminals;wirecrosssection2.5mm2max,internalground
Terminalforbrassnickel-platedor{stainlesssteel}threadedconnection
{additionalexternalgroundterminalforstainlesssteelthreadedconduitconnection}
Approx.0.75
{}Itemsincurvedbracketsareoptionalextrasatadditionalcost.
Page 2 of 4
Datasheet F-20, F-21 · 1/2011
Dimensions in inches (mm)
3.35”(85mm)
1.89”(48mm)
Optional cable gland:
Ingress protection
IP 67
NEMA 4
1.24”(31.5mm)
2.60”(66mm)
1/2 NPT female conduit:
Ingress protection
NEMA 4X / IP 67
2.13”(54mm)
1/2” NPT female conduit
1.06”(27mm)
F-20 Pressure connections
1/4 NPT male
Order code: NB
Other connections
available
.75”(13mm)
.75”
(19mm)
1.08”(27.5mm)
.51”(21.5mm)
1/2 NPT male
Order code: ND
1/2NPT
.08”(2mm)
O .69” (17.5mm)
.08”(2mm)
O .24” (6mm)
.51”(13mm)
G1/4B male
Order code: GB
.85”(21.5mm)
.12”(3mm)
.79”(20mm)
.12”(3mm)
1.12”(28.5mm)
G 1/2 male
EN 837
Order code: GD
O.20”
O.37”
F-21 flush diaphragm pressure connections
.39”(10mm)
O-ring 15x2
.98”(25mm)
1.22”(31mm)
O-ring 26x2
Sealing ring
18.5x23.9x1.5
.81”(20.5mm)
.81”(20.5mm)
.39”(10mm)
Sealing ring
29.7x35.7x2.0
G1
according to EHEDG *) 100 InWC to 250 psi
Order code: 84
1.52”(38.5mm)
G 1/2B
30 psi to 8,000 psi
Order code: 86
G 1B
50 InWC to 25 psi
Order code: 85
Sealing ring
29.7x35.7x2.0
O-ring 21.82x3.53 *) European Hygienic Equipment Design Group
Datasheet F-20, F-21 · 1/2011
Page 3 of 4
Matching P-1 weld insert adapters for F-21 flush diaphragm transmitters
weld
P-1 G1 weld insert adapter
Part # 1206974
for pressure ranges < 25 psi
P-1 G1/2 weld insert adapter
Part # 1097008
for pressure ranges > 30 psi
Cross section view of P-1
adapter installed in pipe.
Wiring
2-wire system
3-wire system
Legend:
Sig+ output signal positive
UB+ power supply positive
0V power supply negative
Sig - output signal negative
Calibration
Remove the junction box cover. Attach a meter and power supply to the
electrical connector. For gauge ranges the zero potentiometer can be
adjusted to produce a null output when no pressure is applied. Span
adjustment requires the use of a reference pressure source. Compound
and absolute ranges require a vacuum and pressure source. When
calibration is complete, reinstall the junction box cover hand tight.
Zero
adjust
Related products:
Integral junction box version for installation
in hazardous environments
Span
adjust
spring clip
terminal
block
Models IS-20 -F, IS-21-F
see datasheet IS-20
Specifications and dimensions provided in this data sheet represent the state of engineering at the time of printing.
Modifications may take place and materials specified may be replaced by others without prior notice.
Page 4 of 4
Datasheet F-20, F-21 · 1/2011
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WIKA Instrument Corporation
1000 Weigand Boulevard
Lawrenceville, Georgia 30043-5868
Tel: 770-513-8200 Fax: 77-338-5118
wika.com e-mail: info@wika.com