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EJA438W and EJA438N Diaphragm Sealed Gauge Pressure Transmitters
  Seal diaphragm is a pressure sensor component that used to prevent process medium directly into the differential pressure transmitter, they are connected with the transmitter through filled with fluid in the capillary.
Description

1、Introduction

  Seal diaphragm is a pressure sensor component that used to prevent process medium directly into the differential pressure transmitter, they are connected with the transmitter through filled with fluid in the capillary. EJA438W/EJA438N sealed diaphragm type pressure transducer can be used to measure the rate of flow of liquid, gas or steam, as well as liquid level, density and pressure, and then transform it into 4 ~ 20 maDC current signal output. EJA pressure transmitter series support BRAIN, HART and FOUNDATION fieldbus PROFIBUS PA or communication protocol.

2、Technical parameters

Measurement span
Measurement range
Accuracy
EJA438W/EJA438N EJA438W EJA438N
A capsule A capsule A capsule
-0.1~3MPa
(-15~430psi)
-0.1~14MPa
(-15~2000psi)
-0.1~7MPa
(-15~1000psi)
Level of Protection 0.06~3MPa
(8.6~430psi)
0.46~14MPa
(66~2000psi)
0.46~7MPa
(66~1000psi)
explosion-proof ±0.2% ±0.2% ±0.2%
Output Signal IP67,NEMA 4X,JIS C0920 The immersion type
Power FM,CENECEC ATEX,CSA,TIIS,IECEx
Environment Temperature 4~20mA DC or FOUNDATION™ fieldbus PROFIBUS PA two wire system of digital communication
Process Temperature BRAI and HART:10.5~42V DC (intrinsic safety type: 10.5~30V DC)
Fieldbus:9~32V DC (intrinsic safety typeEntitym model9~24V DC,intrinsic safety typeFISCO model9~17.5V DC)
The maximum pressure -40~60℃(-40~140℉) (normal)
-30~60℃(-22~140℉) (Built-in indicator in)
the environment should be worked in the range of the filling liquid.
Installation -50~300℃(-58~572℉)
he environment should be worked in the range of the filling liquid.
Measurement span The maximum measurement value.
Work pressure must be within the scope of the flange pressure rated.
Measurement range Transmitter : 2-inch piped installation
Diaphragm seal: flange installation
     Flange size Flat flange type: 3-inch (80mm),2-inch (50mm)
The convex flange type: 4-inch (100mm),3-inch (80mm)
Capsule material hastelloyC - 276, tantalum material, monel
Flange material S25C,SUS304,SUS316
Shell Aluminum alloy or SUS316 stainless steel (optional)

3、Product selection table

  The basic model code: EJA438W-DASJ1AA-AA01-92NN

  EJA438N----- Diaphragm sealed gauge pressure transmitter (Extended diaphragm type)
 

Output signal
-D 4 to 20 mA DC with digital communication (BRAIN protocol)
-E 4 to 20 mA DC with digital communication (HART protocol) *1
-F Digital communication (FOUNDATION Fieldbus protocol) *2
-G Digital communication (PROFIBUS PA protocol) *6
Measurement span
(capsule)
A 0.06-3MPa(0.6-30kgf/cm2)
B 0.46-14MPa(4.6-140kgf/cm2)
Wetted parts material *5
S# [Diaphragm]   [Pipe]     [Others] 
JIS SUS316L  JIS SUS316  JIS SUS316 *7
Flange rating
J1 JIS 10K
J2 JIS 20K
J4 JIS 40K
J6 JIS 63K
A1 ANSI Class 150  P1 . . . . . . . . JPI Class 150
A2 ANSI Class 300  P2. . . . . . . . JPI Class 300
D2 DIN PN10/16
D4 DIN PN25/40
Diaphragm extension length 2 X2=50 mm
4 X2=100 mm
6 X2=150 mm
Process flange size / material
☆D 80mm(3")/JIS S25C
E 80mm(3")/JIS SUS304
F 80mm(3")/JIS SUS316
  ☆A JIS SCM435
B JIS SUS630
Cover flange bolts material
Fill fluid
☆-A For general use (silicone oil)  -10 to 250

 C  -10 to 60℃
-B For general use (silicone oil)  -30 to 180

 C  -15 to 60℃
-  B Always B
  -9 Horizontal impulse piping type, left side high pressure
  Electrical connection
0 G1/2 female, one electrical connection
☆2 1/2 NPT female, two electrical connections without blind plug  
3 PG 13.5 female, two electrical connections without blind plug  
4 M20 female, two electrical connections without blind plug  
5 G1/2 female, two electrical connections and a blind plug  
7 1/2 NPT female, two electrical connections and a blind plug  
8 PG 13.5 female, two electrical connections and a blind plug  
9 M20 female, two electrical connections and a blind plug  
  A G1/2 female, two electrical connections and a SUS316 blind plug
  C 1/2 NPT female, two electrical connections and a SUS316 blind plug
  D M20 female, two electrical connections and a SUS316 blind plug
  Integral indicator
D Digital indicator
E Digital indicator with the range setting switch*5
☆N (None)
  Mounting bracket
☆A SECC Carbon steel   2-inch pipe mounting (flat type)
B SUS304      2-inch pipe mounting (flat type)
J SUS316      2-inch pipe mounting (flat type)
C SECC Carbon steel   2-inch pipe mounting (L type)
D SUS304      2-inch pipe mounting (L type)
  K SUS316      2-inch pipe mounting (L type)
  N (None)

  The ‘☆’marks indicate the most typical selection for each specification.Example:EJA438W-DASJ1AA-AA01-92NN The ‘#’marks indicate the construction materials conform to NACE material recommendations per MR01-75. For the use ofSUS316 material, there may be certain limitations for pressure and temperature. Please refer to NACE standards for details.

  *1:Low pressure side wetted parts material: Cover flange; SCS14A, Process connector; SCS14A,Capsule;SUSF316L, SUS316L or ASTM grade 316L (Diaphragm; Hastelloy C-276 or ASTM N10276), Vent plug;SUS316 or ASTMgr ade 316

  *2:Not applicable for Output signal code F and G.

  *3:Users must consider the characteristics of selected wetted parts material and the influence of process fluids.The use of inapp ropri-ate materials can result in the leakage of corrosive process fluids and cause injury to personnel and/or damage to plant facilities. Itis also possible that the diaphragm itself can be damaged and that material from the broken diaphragm and the fill fluid cancontaminate the user's process fluids.Be very careful with highly corrosive process fluids such as hydrochloric acid, sulfuric acid, hydrogen sulfide, sodium hypochlorite,and high-temperature steam (150 °C [302 ° F] or above). Contact Yokogawa for detailed information of the wetted parts material.

  *4:Hastelloy C-276 or ASTM N10276.

  *5:SUS316 or ASTM grade 316.

  *6:SUS304 or ASTM grade 304. Forged version may be used.

  *7:SUS316 or ASTM grade 316. Forged version may be used
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