YOKOGAWA EJA210E User Manual

<4. Installing Impulse Piping>
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IM01C25A01-01E
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Liquid
Gas Steam
Union or flange
Tee
Tee
Drain plug
Drain valve
Drain valve
Drain plug
Union or flange
Union or
flange
Union or flange
Tap valve
Tap valve
Tee
Drain valve
Drain plug
Tap valve
Figure 4.8 Impulse Piping Connection Examples
(for gauge/absolute pressure
transmitters)
4.3 Process Piping Installation
Precautions (EJ115)
4.3.1 Connecting Process Piping to the
Transmitter
(1) ConrmingtheProcessFluidFlow
Direction
Themark“ ”onthemanifoldindicatesthedirectionin
whichtheprocessuidisowed(fromrighttoleft).
Whenconnectingtheprocesspipingtotheprocess
connector,conrmtheprocessuidowdirection.
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Flow direction (from right to left)
Manifold
Orifice name plate
Process connector
(low pressure side)
Process connector
(high pressure side)
Process connection
(outflow side)
Process connection
(inflow side)
Figure 4.9 Manifold and Flow Direction Indication
(2) Tightening the Process Connector
Mounting Bolts
Thetransmitterisshippedwiththeprocessconnector
mountingboltsonlylooselytightened.Afterconnecting
theprocesspiping,tightentheseboltsuniformlyto
preventleakswithatorqueof39to49N·m{4to5kgf·m}.
(3) Removing the Process Connector Port
Dustproof Cap
Theprocessconnectorportthreadsarecoveredwitha
plasticcaptoexcludedust.Thiscapmustberemoved
beforeconnectingthepiping.(Becarefulnottodamage
thethreadswhenremovingthiscap.Neverinserta
screwdriverorothertoolbetweenthecapandport
threadstoremovethecap.)
4.3.2 Routing the Process Piping
(1) Relationship between Process Fluid
and Manifold Locations (For the vertical
impulse piping type)
Ifcondensate(orgas)generatedintheprocesspiping
wereallowedtoaccumulate,thenitwouldbenecessary
toremoveitperiodicallybyopeningthedrain(or
vent)plug.However,thiswouldgenerateatransient
disturbanceinthepressuremeasurement.Therefore,the
processpipingmustberoutedsothatanycondensate(or
gas)generatedintheprocesspipingwillnotaccumulate
inthepressure-sensingassemblyofthetransmitter.
NOTE
• Iftheprocessuidisagas,thenasarulethe
manifoldmustbelocatedatthedownsideofthe
pressure-sensingassembly.
• Iftheprocessuidisaliquid,thenasarulethe
manifoldmustbelocatedattheupsideofthe
pressure-sensingassembly.
(2) Pipe Size for Process Piping
Usea15mm(1/2-inch)pipeforprocesspiping
connectiontotheprocessconnector.
(3) Preventing Freezing
Ifthereisanyriskthattheprocessuidinthetransmitter
pressure-sensingassemblycouldfreezeorsolidify,use
asteamjacketorheatertomaintainthetemperatureof
theuid.
(4) Process Piping Connection Examples
Figure4.10showsexamplesoftypicalprocesspiping
connections.Beforeconnectingthetransmittertothe
process,studythetransmitterinstallationlocation,the
processpipinglayout,andthecharacteristicsofthe
processuid(corrosiveness,toxicity,ammability,etc.),in
ordertomakeappropriatechangesandadditionstothe
connectioncongurations.
Notethefollowingpointswhenreferringtothesepiping
examples.
• Theprocesspipingmaterialusedmustbecompatible
withtheprocesspressure,temperature,andother
conditions.

YOKOGAWA EJA210E Specifications

General

Brand	YOKOGAWA
Model	EJA210E
Category	Transmitter
Language	English