Newsletter
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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
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Measurement span
Measurement range
Accuracy
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EJA438W/EJA438N | EJA438W | EJA438N |
| A capsule | A capsule | A capsule | |
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-0.1~3MPa (-15~430psi) |
-0.1~14MPa (-15~2000psi) |
-0.1~7MPa (-15~1000psi) |
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| 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) |
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| 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. |
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| Installation |
-50~300℃(-58~572℉) he environment should be worked in the range of the filling liquid. |
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| Measurement span |
The maximum measurement value. Work pressure must be within the scope of the flange pressure rated. |
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| Measurement range |
Transmitter : 2-inch piped installation Diaphragm seal: flange installation |
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| Flange size |
Flat flange type: 3-inch (80mm)，2-inch (50mm) The convex flange type: 4-inch (100mm)，3-inch (80mm) |
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| 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 |
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| -G | Digital communication (PROFIBUS PA protocol) *6 | ||||||||||||||||||||||||||||||||
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Measurement span (capsule) |
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| Wetted parts material *5 |
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| Flange rating |
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| Diaphragm extension length | 2 | X2=50 mm | |||||||||||||||||||||||||||||||
| 4 | X2=100 mm | ||||||||||||||||||||||||||||||||
| 6 | X2=150 mm | ||||||||||||||||||||||||||||||||
| Process flange size / material |
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| ☆A | JIS SCM435 | ||||||||||||||||||||||||||||||||
| B | JIS SUS630 | ||||||||||||||||||||||||||||||||
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Cover flange bolts material Fill fluid |
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| - | B | Always B | |||||||||||||||||||||||||||||||
| -9 | Horizontal impulse piping type, left side high pressure | ||||||||||||||||||||||||||||||||
| Electrical connection |
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| 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 |
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| Mounting bracket |
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| 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
EJA110A Differential pressure transmitter/EJA118W/EJA118Y/EJA118N Double flanges differential pressure transmitter/EJA120A micro differential pressure transmitter/ EJA130A High performance differential pressure transmitter/EJA210A/EJA220A Flange Mounted Differential Pressure Transmitter/ EJA310A Absolute Pressure Transmitter/ EJA430A Gauge Pressure Transmitter/ EJA438W and EJA438N Diaphragm Sealed Gauge Pressure Transmitters/ Model EJA440A High Pressure Transmitter/EJA510A and EJA530A Absolute and Gauge Pressure Transmitters/Model EJX110A Differential pressure transmitter/EJX118W Diaphragm Sealed Differential Pressure Transmitters/EJX210A Flange Mounted Differential Pressure Transmitter/EJX430A Gauge pressure transmitter/ EJX438A Diaphragm seal pressure transmitter/EJX910A Multivariable Pressure Transmitter
