YOKOGAWA Dpharp EJA118N User manual

Instruction
Manual
Yokogawa Electric Corporation
Model EJA118W, EJA118N and
EJA118Y Diaphragm Sealed
Differential Pressure Transmitters
[Style: S2]
IM 1C22H1-01E
IM 1C22H1-01E
10th Edition

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i
CONTENTS
IM 1C22H1-01E
FD No. IM 1C22H1-01E
10th Edition: Feb. 2000(YK)
All Rights Reserved, Copyright © 1995, Yokogawa Electric Corporation
CONTENTS
1. INTRODUCTION............................................................................................1-1
WARRANTY.................................................................................................. 1-2
2. HANDLING CAUTIONS ................................................................................2-1
2.1 Model and Specifications Check......................................................... 2-1
2.2 Unpacking ........................................................................................... 2-1
2.3 Storage................................................................................................ 2-1
2.4 Selecting the Installation Location ...................................................... 2-2
2.5 Pressure Connection........................................................................... 2-2
2.6 Waterproofing of Cable Conduit Connections .................................... 2-2
2.7 Restrictions on Use of Radio Transceiver .......................................... 2-2
2.8 Insulation Resistance and Dielectric Strength Test............................ 2-3
2.9 Installation of Explosion Protected Type ............................................ 2-3
2.9.1 FM Approval ................................................................................. 2-3
2.9.2 CSA Certification .......................................................................... 2-5
2.9.3 SAA Certification .......................................................................... 2-6
2.9.4 CENELEC (KEMA)/IEC (KEMA) Certification.............................. 2-7
2.9.5 JIS Certification ............................................................................ 2-9
2.10 EMC Conformity Standards ................................................................ 2-9
3. COMPONENT NAMES..................................................................................3-1
4. INSTALLATION.............................................................................................4-1
4.1 Precautions ......................................................................................... 4-1
4.2 Mounting the Diaphragm Seals .......................................................... 4-1
4.3 Transmitter Mounting .......................................................................... 4-2
4.4 Affixing the Teflon Film ....................................................................... 4-3
4.5 Rotating Transmitter Section .............................................................. 4-3
5. WIRING..........................................................................................................5-1
5.1 Wiring Precautions .............................................................................. 5-1
5.2 Selecting the Wiring Materials ............................................................ 5-1
5.3 Connections of External Wiring to Terminal Box................................ 5-1
5.3.1 Power Supply Wiring Connection ................................................ 5-1
5.3.2 External Indicator Connection ...................................................... 5-1
5.3.3 BRAIN TERMINAL BT200 Connection ........................................ 5-2
5.3.4 Check Meter Connection.............................................................. 5-2
5.4 Wiring .................................................................................................. 5-2
5.4.1 Loop Configuration ....................................................................... 5-2
(1) General-use Type and Flameproof Type..................................... 5-2
(2) Intrinsically Safe Type ................................................................. 5-2
5.4.2 Wiring Installation ......................................................................... 5-3
(1) General-use Type and Intrinsically Safe Type............................. 5-3
(2) Flameproof Type (JIS) ................................................................ 5-3
5.5 Grounding............................................................................................ 5-4
5.6 Power Supply Voltage and Load Resistance ..................................... 5-4

ii
CONTENTS
IM 1C22H1-01E
6. OPERATION..................................................................................................6-1
6.1 Preparation for Starting Operation...................................................... 6-1
6.2 Zero Point Adjustment ........................................................................ 6-2
6.2.1 When you can obtain Low Range Value from actual measured
value of 0% (0 kPa, atmospheric pressure); ............................... 6-2
6.2.2 When you cannot obtain Low Range Value from actual
measured value of 0%; ................................................................ 6-2
6.3 Starting Operation ............................................................................... 6-3
6.4 Shutting Down Operation.................................................................... 6-3
6.5 Setting the Range Using the Range-setting Switch ........................... 6-4
7. BRAIN TERMINAL BT200 OPERATION .....................................................7-1
7.1 BT200 Operation Precautions............................................................. 7-1
7.1.1 Connecting the BT200 ................................................................. 7-1
7.1.2 Conditions of Communication Line .............................................. 7-1
7.2 BT200 Operating Procedures ............................................................. 7-1
7.2.1 Key Layout and Screen Display................................................... 7-1
7.2.2 Operating Key Functions.............................................................. 7-2
(1) Alphanumeric Keys and Shift Keys............................................. 7-2
(2) Function Keys ............................................................................. 7-2
7.2.3 Calling Up Menu Addresses Using the Operating Keys.............. 7-3
7.3 Setting Parameters Using the BT200 ................................................. 7-4
7.3.1 Parameter Summary .................................................................... 7-4
7.3.2 Parameter Usage and Selection .................................................. 7-6
7.3.3 Setting Parameters....................................................................... 7-7
(1) Tag No. Setup ............................................................................. 7-7
(2) Calibration Range Setup............................................................. 7-7
(3) Damping Time Constant Setup ................................................... 7-8
(4) Output Mode and Integral Indicator Display Mode Setup ........... 7-9
(5) Output Signal Low Cut Mode Setup............................................ 7-9
(6) Integral Indicator Scale Setup................................................... 7-10
(7) Unit Setup for Displayed Temperature ...................................... 7-11
(8) Unit Setup for Displayed Static Pressure.................................. 7-12
(9) Operation Mode Setup.............................................................. 7-12
(10) Impulse Line Connection Orientation Setup ............................. 7-12
(11) Output Status Display/Setup when a CPU Failure.................... 7-12
(12) Output Status Setup when a Hardware Error Occurs ............... 7-12
(13) Bi-directional Flow Measurement Setup ................................... 7-13
(14) Range Change while Applying Actual Inputs ............................ 7-13
(15) Zero Point Adjustment............................................................... 7-14
(16) Test Output Setup ..................................................................... 7-15
(17) User Memo Fields..................................................................... 7-15
7.4 Displaying Data Using the BT200..................................................... 7-16
7.4.1 Displaying Measured Data ......................................................... 7-16
7.4.2 Display Transmitter Model and Specifications........................... 7-16
7.5 Self-Diagnostics ................................................................................ 7-16
7.5.1 Checking for Problems............................................................... 7-16
(1) Identifying Problems with BT200 .............................................. 7-16
(2) Checking with Integral Indicator................................................ 7-17
7.5.2 Errors and Countermeasures..................................................... 7-18

iii
CONTENTS
IM 1C22H1-01E
8. MAINTENANCE.............................................................................................8-1
8.1 Overview ............................................................................................. 8-1
8.2 Calibration Instruments Selection ....................................................... 8-1
8.3 Calibration ........................................................................................... 8-1
8.4 Disassembly and Reassembly............................................................ 8-3
8.4.1 Replacing the Integral Indicator ................................................... 8-3
8.4.2 Replacing the CPU Assembly...................................................... 8-4
8.5 Troubleshooting................................................................................... 8-5
8.5.1 Basic Troubleshooting.................................................................. 8-5
8.5.2 Troubleshooting Flow Charts ....................................................... 8-5
9. GENERAL SPECIFICATIONS ......................................................................9-1
9.1 Standard Specifications ...................................................................... 9-1
9.2 Model and Suffix Codes...................................................................... 9-3
9.3 Optional Specifications........................................................................ 9-6
9.4 Dimensions.......................................................................................... 9-8
INSTALLATION AND OPERATING PRECAUTIONS FOR
JIS INTRINSICALLY SAFE EQUIPMENT.......................................... EX-A03E
INSTALLATION AND OPERATING PRECAUTIONS FOR
JIS FLAMEPROOF EQUIPMENT....................................................... EX-B03E
Customer Maintenance Parts List
DPharp EJA Series Transmitter Section ............................CMPL 1C22A1-02E
Models EJA118W, EJA118N, and EJA118Y Diaphragm Sealed
Differential Pressure Transmitter ............................. CMPL 1C22H1-01E
REVISION RECORD

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IM 1C22H1-01E
1-1
1. INTRODUCTION
1. INTRODUCTION
Thank you for purchasing the DPharp electronic
pressure transmitter.
The DPharp Pressure Transmitters are precisely
calibrated at the factory before shipment. To ensure
correct and efficient use of the instrument, please read
this manual thoroughly and fully understand how to
operate the instrument before operating it.
jRegarding This Manual
• This manual should be passed on to the end user.
• The contents of this manual are subject to change
without prior notice.
• All rights reserved. No part of this manual may be
reproduced in any form without Yokogawa’s written
permission.
• Yokogawa makes no warranty of any kind with
regard to this manual, including, but not limited to,
implied warranty of merchantability and fitness for a
particular purpose.
• If any question arises or errors are found, or if any
information is missing from this manual, please
inform the nearest Yokogawa sales office.
• The specifications covered by this manual are
limited to those for the standard type under the
specified model number break-down and do not
cover custom-made instruments.
• Please note that changes in the specifications,
construction, or component parts of the instrument
may not immediately be reflected in this manual at
the time of change, provided that postponement of
revisions will not cause difficulty to the user from a
functional or performance standpoint.
NOTE
For FOUNDATION Fieldbus and HART protocol
versions, please refer to IM 1C22T2-01E and IM
1C22T1-01E respectively, in addition to this IM.
jSafety Precautions
• For the protection and safety of the operator and the
instrument or the system including the instrument,
please be sure to follow the instructions on safety
described in this manual when handling this instru-
ment. In case the instrument is handled in contradic-
tion to these instructions, Yokogawa does not
guarantee safety.
• For the intrinsically safe equipment and
explosionproof equipment, in case the instrument is
not restored to its original condition after any repair
or modification undertaken by the customer,
intrinsically safe construction or explosionproof
construction is damaged and may cause dangerous
condition. Please contact Yokogawa for any repair
or modification required to the instrument.
• The following safety symbol marks are used in this
Manual:
WARNING
Indicates a potentially hazardous situation which,
if not avoided, could result in death or serious
injury.
CAUTION
Indicates a potentially hazardous situation which,
if not avoided, may result in minor or moderate
injury. It may also be used to alert against
unsafe practices .
IMPORTANT
Indicates that operating the hardware or software
in this manner may damage it or lead to system
failure.
NOTE
Draws attention to information essential for
understanding the operation and features.

IM 1C22H1-01E
1-2
1. INTRODUCTION
WARRANTY
• The warranty shall cover the period noted on the
quotation presented to the purchaser at the time of
purchase. Problems occurred during the warranty
period shall basically be repaired free of charge.
• In case of problems, the customer should contact the
Yokogawa representative from which the instrument
was purchased, or the nearest Yokogawa office.
• If a problem arises with this instrument, please
inform us of the nature of the problem and the
circumstances under which it developed, including
the model specification and serial number. Any
diagrams, data and other information you can
include in your communication will also be helpful.
• Responsible party for repair cost for the problems
shall be determined by Yokogawa based on our
investigation.
• The Purchaser shall bear the responsibility for repair
costs, even during the warranty period, if the
malfunction is due to:
- Improper and/or inadequate maintenance by the
purchaser.
- Failure or damage due to improper handling, use or
storage which is out of design conditions.
- Use of the product in question in a location not
conforming to the standards specified by
Yokogawa, or due to improper maintenance of the
installation location.
- Failure or damage due to modification or repair by
any party except Yokogawa or an approved
representative of Yokogawa.
- Malfunction or damage from improper relocation
of the product in question after delivery.
- Reason of force majeure such as fires, earthquakes,
storms/floods, thunder/lightening, or other natural
disasters, or disturbances, riots, warfare, or
radioactive contamination.
WARNING
• Instrument installed in the process is under
pressure. Never loosen or tighten the flange
bolts as it may cause dangerous spouting of
process fluid.
• Since the accumulated process fluid may be
toxic or otherwise harmful, take appropriate
care to avoid contact with the body, or inhala-
tion of vapors even after dismounting the
instrument from the process line for mainte-
nance.
CAUTION
This instrument is tested and certified as intrinsi-
cally safe type or explosionproof type. Please
note that the construction of the instrument,
installation, external wiring, maintenance or
repair is strictly restricted, and non-observance
or negligence of this restriction would result in
dangerous condition.

IM 1C22H1-01E
2-1
2. HANDLING CAUTIONS
2. HANDLING CAUTIONS
This chapter describes important cautions regarding
how to handle the transmitter. Read carefully before
using the transmitter.
The EJA Series pressure transmitters are thoroughly
tested at the factory before shipment. When the
transmitter is delivered, visually check them to make
sure that no damage occurred during shipment.
Also check that all transmitter mounting hardware
shown in Figure 2.1 is included. If the transmitter was
ordered without the mounting bracket, the transmitter
mounting hardware is not included. After checking the
transmitter, repack it in the way it was delivered until
installation.
Mounting bracket
U-bolt nut
U-bolt
Transmitter
mounting bolt
F0201.EPS
Figure 2.1 Transmitter Mounting Hardware
2.1 Model and Specifications
Check
The model name and specifications are indicated on the
name plate attached to the case. If the reverse operat-
ing mode was ordered (reverse signal), ‘REVERSE’
will be inscribed in field *1; if square root display
mode was ordered, ‘SQRT’ is inscribed in field *2; if
square root output mode was ordered, ‘SQRT’ is
inscribed in field *3.
Figure 2.2 Name Plate Example of JIS Flameproof Type
2.2 Unpacking
When moving the transmitter to the installation site,
keep it in its original packaging. Then, unpack the
transmitter there to avoid damage on the way.
2.3 Storage
The following precautions must be observed when
storing the instrument, especially for a long period.
(a) Select a storage area which meets the following
conditions:
• It is not exposed to rain or water.
• It suffers minimum vibration and shock.
• It has an ambient temperature and relative
humidity within the following ranges.
Ambient temperature:
–40 to 85°C without integral indicator
–30 to 80°C with integral indicator
Relative humidity:
5% to 100% R.H. (at 40°C)
Preferred temperature and humidity:
approx. 25°C and 65% R.H.
(b) When storing the transmitter, repack it as nearly as
possible to the way it was packed when delivered
from the factory.
(c) If storing a transmitter that has been used, thor-
oughly clean the diaphragm surface of the dia-
phragm seal (pressure-detector section), so that no
measured fluid remains on them. Also make sure
before storing that the pressure-detector and
transmitter assemblies are securely mounted.

IM 1C22H1-01E
2-2
2. HANDLING CAUTIONS
2.4 Selecting the Installation
Location
The transmitter is designed to withstand severe
environmental conditions. However, to ensure stable
and accurate operation for years, observe the following
precautions when selecting an installation location.
(a) Ambient Temperature
Avoid locations subject to wide temperature
variations or a significant temperature gradient. If
the location is exposed to radiant heat from plant
equipments, provide adequate thermal insulation
and/or ventilation.
(b) Ambient Atmosphere
Avoid installing the transmitter in a corrosive
atmosphere. If the transmitter must be installed in a
corrosive atmosphere, there must be adequate
ventilation as well as measures to prevent intrusion
or stagnation of rain water in conduits.
(c) Shock and Vibration
Select an installation site suffering minimum shock
and vibration (although the transmitter is designed
to be relatively resistant to shock and vibration).
(d) Installation of Explosion-protected Transmitters
Explosion-protected transmitters can be installed in
hazardous areas according to the types of gases for
which they are certified. See Subsection 2.9
“Installation of Explosion Protected Type Transmit-
ters.”
2.5 Pressure Connection
WARNING
• Instrument installed in the process is under
pressure. Never loosen or tighten the flange
bolts to avoid the dangerous spouting of
process fluid.
• Since the accumulated process fluid may be
toxic or otherwise harmful, take appropriate
care to avoid contact with the skin, eyes or
body, or inhalation of vapors even after dis-
mounting the instrument from process line for
maintenance.
The following precautions must be observed in order to
safely operate the transmitter under pressure.
(a) Never apply a pressure higher than the specified
maximum working pressure.
(b) Never loosen or tighten the bolts securing the
diaphragm seal flanges when the assembly is under
pressure. Do it after releasing the process pressure
if required.
2.6 Waterproofing of Cable
Conduit Connections
Apply a non-hardening sealant to the threads to
waterproof the transmitter cable conduit connections.
(See Figure 5.4.2a, 5.4.2b and 5.4.2d.)
2.7 Restrictions on Use of Radio
Transceiver
IMPORTANT
Although the transmitter has been designed to
resist high frequency electrical noise, if a radio
transceiver is used near the transmitter or its
external wiring, the transmitter may be affected
by high frequency noise pickup. To test for such
effects, bring the transceiver in use slowly from a
distance of several meters from the transmitter,
and observe the measurement loop for noise
effects. Thereafter, always use the transceiver
outside the area affected by noise.

IM 1C22H1-01E
2-3
2. HANDLING CAUTIONS
2.8 Insulation Resistance and
Dielectric Strength Test
Since the transmitter has undergone insulation resis-
tance and dielectric strength tests at the factory before
shipment, normally these tests are not required.
However, if required, observe the following precau-
tions in the test procedures.
(a) Do not perform such tests more frequently than is
absolutely necessary. Even test voltages that do not
cause visible damage to the insulation may degrade
the insulation and reduce safety margins.
(b) Never apply a voltage exceeding 500 V DC (100 V
DC with an internal lightning protector) for the
insulation resistance test, nor a voltage exceeding
500 V AC (100 V AC with an internal lightning
protector) for the dielectric strength test.
(c) Before conducting these tests, disconnect all signal
lines from the transmitter terminals. Perform the
tests in the following procedure:
• Insulation Resistance Test
1) Short-circuit the + and – SUPPLY terminals in the
terminal box.
2) Turn OFF the insulation tester. Then connect the
insulation tester plus (+) lead wire to the shorted
SUPPLY terminals and the minus (–) leadwire to
the grounding terminal.
3) Turn ON the insulation tester power and measure
the insulation resistance. The voltage should be
applied short as possible to verify that the insula-
tion resistance is at least 20 MΩ.
4) After completing the test and being very careful not
to touch exposed conductors disconnect the
insulation tester and connect a 100 kΩresistor
between the grounding terminal and the short-
circuiting SUPPLY terminals. Leave this resistor
connected at least one second to discharge any
static potential. Do not touch the terminals while it
is discharging.
• Dielectric Strength Test
1) Short-circuit the + and – SUPPLY terminals in the
terminal box.
2) Turn OFF the dielectric strength tester. Then
connect the tester between the shorted SUPPLY
terminals and the grounding terminal. Be sure to
connect the grounding lead of the dielectric strength
tester to the ground terminal.
3) Set the current limit on the dielectric strength tester
to 10 mA, then turn ON the power and gradually
increase the test voltage from ‘0’ to the specified
voltage.
4) When the specified voltage is reached, hold it for
one minute.
5) After completing this test, slowly decrease the
voltage to avoid any voltage surges.
2.9 Installation of Explosion
Protected Type
NOTE
For FOUNDATION Fieldbus explosion protected
type, please refer to IM 1C22T2-01E.
WARNING
To pressure the safety of explosionproof equip-
ment requires great care during mounting,
wiring, and piping. Safety requirements also
place restrictions on maintenance and repair
activities. Please read the following sections very
carefully.
2.9.1 FM Approval
a. FM Intrinsically Safe Type
Caution for FM intrinsically safe type. (Following
contents refer “DOC. No. IFM012-A12 P.1 and 2.”)
Note 1. Model EJA Series pressure transmitters
with optional code /FS1 are applicable for
use in hazardous locations.
• Intrinsically Safe for Class I, Division 1, Groups A,
B, C & D. Class II, Division 1, Groups E, F & G
and Class III, Division 1 Hazardous Locations.
• Nonincendive for Class I, Division 2, Groups A, B,
C & D. Class II, Division 2, Groups E, F & G and
Class III, Division 1 Hazardous Locations.
• Outdoor hazardous locations, NEMA 4X.
• Temperature Class: T4
• Ambient temperature: –40 to 60°C
Note 2. Entity Parameters
• Intrinsically Safe Apparatus Parameters
[Groups A, B, C, D, E, F and G]
Vmax = 30 V Ci = 22.5 nF
Imax = 165 mA Li = 730 µH
Pmax = 0.9 W
* Associated Apparatus Parameters
(FM approved barriers)
Voc ≤30 V Ca > 22.5 nF
Isc ≤165 mA La > 730 µH
Pmax ≤0.9W

IM 1C22H1-01E
2-4
2. HANDLING CAUTIONS
• Intrinsically Safe Apparatus Parameters
[Groups C, D, E, F and G]
Vmax = 30 V Ci = 22.5 nF
Imax = 225 mA Li = 730 µH
Pmax = 0.9 W
* Associated Apparatus Parameters
(FM approved barriers)
Voc ≤30 V Ca > 22.5 nF
Isc ≤225 mA La > 730 µH
Pmax ≤0.9 W
• Entity Installation Requirements
Vmax ≥Voc or Vt, Imax ≥Isc or It,
Pmax (IS Apparatus) ≥Pmax (Barrier)
Ca ≥Ci + Ccable, La ≥Li + Lcable
Note 3. Installation
• Barrier must be installed in an enclosure that meets
the requirements of ANSI/ISA S82.01.
• Control equipment connected to barrier must not use
or generate more than 250 V rms or V dc.
• Installation should be in accordance with ANSI/ISA
RP12.6 “Installation of Intrinsically Safe Systems for
Hazardous (Classified) Locations” and the National
Electric Code (ANSI/NFPA 70).
• The configuration of associated apparatus must be
FMRC Approved.
• Dust-tight conduit seal must be used when installed
in a Class II, III, Group E, F and G environments.
• Associated apparatus manufacturer’s installation
drawing must be followed when installing this
apparatus.
• The maximum power delivered from the barrier
must not exceed 0.9 W.
• Note a warning label worded “SUBSTITUTION OF
COMPONENTS MAY IMPAIR INTRINSIC
SAFETY,” and “INSTALL IN ACCORDANCE
WITH DOC. No. IFM012-A12 P.1 and 2.”
Note 4. Maintenance and Repair
• The instrument modification or parts replacement by
other than authorized representative of Yokogawa
Electric Corporation is prohibited and will void
Factory Mutual Intrinsically safe and Nonincendive
Approval.
F0203.EPS
Class I, II, III, Division 1,
Groups A, B, C, D, E, F, G
EJA Series Pressure
Transmitters
EJA Series Pressure
Transmitters
Safety Barrier
Supply
Supply
Hazardous Location Nonhazardous Location
Hazardous Location Nonhazardous Location
General
Purpose
Equipment
+
–
+
–
+
–
+
–
+
–
+
–
[Intrinsically Safe]
Class I, II, Division 2,
Groups A, B, C, D, E, F, G
Class III, Division 1.
Not Use
Safety Barrier
[Nonincendive]
General
Purpose
Equipment
b. FM Explosionproof Type
Caution for FM explosionproof type.
Note 1. Model EJA Series differential, gauge,
and absolute pressure transmitters with
optional code /FF1 are applicable for
use in hazardous locations.
• Explosionproof for Class I, Division 1, Groups B,
C and D.
• Dust-ignitionproof for Class II/III, Division 1,
Groups E, F and G.
• Outdoor hazardous locations, NEMA 4X.
• Temperature Class: T6
• Ambient Temperature: –40 to 60°C
• Supply Voltage: 42 V dc max.
• Output signal: 4 to 20 mA
Note 2. Wiring
• All wiring shall comply with National Electrical
Code ANSI/NEPA70 and Local Electrical Codes.
• When installed in Division 1, “FACTORY
SEALED, CONDUIT SEAL NOT REQUIRED.”
Note 3. Operation
• Keep the “CAUTION” nameplate attached to the
transmitter.
CAUTION: OPEN CIRCUIT BEFORE REMOV-
ING COVER. FACTORY SEALED, CONDUIT
SEAL NOT REQUIRED. INSTALL IN ACCOR-
DANCE WITH THE INSTRUCTION MANUAL
IM 1C22.
• Take care not to generate mechanical sparking
when accessing to the instrument and peripheral
devices in a hazardous location.

IM 1C22H1-01E
2-5
2. HANDLING CAUTIONS
Note 4. Maintenance and Repair
• The instrument modification or parts replacement
by other than authorized representative of
Yokogawa Electric Corporation is prohibited and
will void Factory Mutual Explosionproof Approval.
c. FM Intrinsically Safe Type/FM
Explosionproof Type
Model EJA Series pressure transmitters with
optional code /FU1 can be selected the type of
protection (FM Intrinsically Safe or FM
Explosionproof) for use in hazardous locations.
Note 1. For the installation of this transmitter,
once a particular type of protection is
selected, any other type of protection
cannot be used. The installation must be
in accordance with the description about
the type of protection in this instruction
manual.
Note 2. In order to avoid confusion, unnecessary
marking is crossed out on the label other
than the selected type of protection when
the transmitter is installed.
2.9.2 CSA Certification
a. CSA Intrinsically Safe Type
Caution for CSA Intrinsically safe type. (Following
contents refer to “DOC No. ICS003-A12 P.1-1 and
P.1-2.”)
Note 1. Model EJA Series differential, gauge, and
absolute pressure transmitters with
optional code /CS1 are applicable for use
in hazardous locations
• Intrinsically Safe for Class I, Division 1, Groups A,
B, C & D. Class II, Division 1, Groups E, F & G
and Class III, Division 1 Hazardous Locations.
• Nonincendive for Class I, Division 2, Groups A, B,
C & D, Class II, Division 2, Groups F & G, and
Class III, Hazardous Locations. (not use Safety
Barrier)
• Encl. “Type 4X”
• Temperature Class: T4
• Ambient temperature: –40 to 60°C
• Process Temperature: 120°C max.
Note 2. Entity Parameters
• Intrinsically safe ratings are as follows:
Maximum Input Voltage (Vmax) = 30 V
Maximum Input Current (Imax) = 165 mA
Maximum Input Power (Pmax) = 0.9 W
Maximum Internal Capacitance (Ci) = 22.5 nF
Maximum Internal Inductance (Li) = 730 µH
* Associated apparatus (CSA certified barriers)
Maximum output voltage (Voc) ≤30 V
Maximum output current (Isc) ≤165 mA
Maximum output power (Pmax) ≤0.9 W
Note 3. Installation
• All wiring shall comply with Canadian Electrical
Code Part I and Local Electrical Codes.
• The instrument modification or parts replacement
by other than authorized representative of
Yokogawa Electric Corporation and Yokogawa
Corporation of America is prohibited and will void
Canadian Standards Intrinsically safe and
nonincendive Certification.
F0204.EPS
Class I, II, III, Division 1,
Groups A, B, C, D, E, F, G
EJA Series Pressure
Transmitters
EJA Series Pressure
Transmitters
Safety Barrier
Supply
Supply
Hazardous Location Nonhazardous Location
Hazardous Location Nonhazardous Location
General
Purpose
Equipment
+
–
+
–
+
–
+
–
+
–
+
–
[Intrinsically Safe]
Class I, II, Division 2,
Groups A, B, C, D, E, F, G
Class III
Not Use
Safety Barrier
[Nonincendive]
General
Purpose
Equipment
b. CSA Explosionproof Type
Caution for CSA explosionproof type.
Note 1. Model EJA Series differential, gauge, and
absolute pressure transmitters with
optional code /CF1 are applicable for use
in hazardous locations:
• Explosionproof for Class I, Division 1, Groups B,
C and D.
• Dust-ignitionproof for Class II/III, Division 1,
Groups E, F and G.
• Encl “Type 4X”
• Temperature Class: T6, T5, and T4
• Process Temperature: 85°C (T6), 100°C (T5), and
120°C (T4)
• Ambient Temperature: –40 to 80°C
• Supply Voltage: 42 V dc max.
• Output Signal: 4 to 20 mA

IM 1C22H1-01E
2-6
2. HANDLING CAUTIONS
Note 2. Wiring
• All wiring shall comply with Canadian Electrical
Code Part I and Local Electrical Codes.
• In hazardous location, wiring shall be in conduit as
shown in the figure.
CAUTION: SEAL ALL CONDUITS
WITHIN 50 cm OF THE ENCLOSURE.
UN SCELLEMENT DOIT ÊTRE
INSTALLÉ À MOINS DE 50 cm DU
BÎTIER.
• When installed in Division 2, “SEALS NOT
REQUIRED.”
Note 3. Operation
• Keep the “CAUTION” label attached to the
transmitter.
CAUTION: OPEN CIRCUIT BEFORE
REMOVING COVER.
OUVRIR LE CIRCUIT AVANT
D´NLEVER LE COUVERCLE.
• Take care not to generate mechanical sparking
when accessing to the instrument and peripheral
devices in a hazardous location.
Note 4. Maintenance and Repair
• The instrument modification or parts replacement
by other than authorized representative of
Yokogawa Electric Corporation and Yokogawa
Corporation of America is prohibited and will void
Canadian Standards Explosionproof Certification.
Non-hazardous
Location
Equipment
42 V DC Max.
4 to 20 mA DC
Signal
Non-Hazardous
Locations Hazardous Locations Division 1
Non-Hazardous
Locations Hazardous Locations Division 2
50 cm Max.
Sealing Fitting Conduit
EJA Series
Non-hazardous
Location
Equipment
42 V DC Max.
4 to 20 mA DC
Signal Sealing Fitting
EJA Series
F0205.EPS
c. CSA Intrinsically Safe Type/CSA
Explosionproof Type
Model EJA Series pressure transmitters with
optional code /CU1 can be selected the type of
protection (CSA Intrinsically Safe or CSA
Explosionproof) for use in hazardous locations.
Note 1. For the installation of this transmitter,
once a particular type of protection is
selected, any other type of protection
cannot be used. The installation must be
in accordance with the description about
the type of protection in this instruction
manual.
Note 2. In order to avoid confusion, unnecessary
marking is crossed out on the label other
than the selected type of protection when
the transmitter is installed.
2.9.3 SAA Certification
a. SAA Intrinsically Safe Type
Caution for SAA Intrinsically safe type and Type n.
Note 1. Model EJA Series differential, gauge, and
absolute pressure transmitters with
optional code /SU1 are applicable for use
in hazardous locations.
• Type of Protection and Marking Code:
Ex ia IIC T4 (Tamb = 60°C) IP67 Class I Zone 0
• Type of Protection and Marking Code:
Ex n IIC T4 (Tamb = 60°C) IP67 Class I Zone 2
• Ambient Temperature: –40 to 60°C
Note 2. Entity Parameters
• Intrinsically safe rating of the transmitters are as
follows.
Maximum Input Voltage (Ui) = 30 V
Maximum Input Current (Ii) = 165 mA
Maximum Input Power (Pi) = 0.9 W
Maximum Internal Capacitance (Ci) = 0.02 µF
Maximum Internal Inductance (Li) = 0.73 mH
Note 3. Wiring
• All Wiring shall comply with the Australian
Standard.
Note 4. Maintenance and Repair
• The instrument modification or parts replacement
by other than authorized representative of
Yokogawa Electric Corporation is prohibited and
will void Standards Association of Australia
Intrinsically safe and Type n Certification.

IM 1C22H1-01E
2-7
2. HANDLING CAUTIONS
(Zone 0)
EJA Series
Pressure
Transmitter
Safety Barrier *1
Hazardous Location Nonhazardous Location
+
–
+
–
[Intrinsic Safety]
F0206.EPS
*1: Any safety barriers used for the output current must be
limited by a resistor “R” such that Imaxout-Uz/R.
[Type n]
(Zone 2)
EJA Series
Pressure
Transmitter
Power Supply *2
Hazardous Location
+
–
+
–
F0207.EPS
*2: The voltage of the power supply is not exceed 30V dc.
b. SAA Flameproof Type
Caution for SAA flameproof type.
Note 1. Model EJA Series differential, gauge, and
absolute pressure transmitters with
optional code /SU1 are applicable for use
in hazardous locations:
• Type of Protection and marking Code:
Ex d II C T* IP67 Class I Zone 1 (T* see schedule)
• Temperature Class: T6, T5, and T4
• Process Temperature:
85°C (T6), 100°C (T5), and 120°C (T4)
• Supply voltage: 42 V dc max.
• Output Signal: 4 to 20 mA
• Ambient Temperature: –40 to 80°C
Note 2. Wiring
• All wiring shall comply with the Australian
Standard.
Note 3. Operation
• Keep the “CAUTION” label attached to the
transmitter.
CAUTION: AMBIENT TEMPERATURE
ABOVE 75 DEG C SELECT SUITABLE
CABLE. DISCONNECT POWER AND
WAIT 1 MINUTE BEFORE REMAKING
COVER
• Take care not to generate mechanical sparking
when accessing to the instrument and peripheral
devices in a hazardous location.
Note 4. Maintenance and Repair
• The instrument modification or parts replacement
by other than authorized representative of
Yokogawa Electric Corporation is prohibited and
will void Standards Association of Australia
Flameproof Certification.
2.9.4 CENELEC (KEMA)/IEC (KEMA)
Certification
a. CENELEC (KEMA) Intrinsically Safe Type
Caution for CENELEC (KEMA) intrinsically safe
type.
Note 1. Model EJA Series differential, gauge, and
absolute pressure transmitters with
optional code /KS1 for potentially explo-
sive atmospheres:
• Type of Protection and Marking code:
EEx ia IIC T4
• Temperature Class: T4
• Process Temperature: 120°C max.
• Ambient Temperature: –40 to 60°C
Note 2. Electrical Data
• In type of explosion protection intrinsic safety EEx
ia IIC only for connection to a certified intrinsically
safe circuit with following maximum values:
Ui = 30 V
Ii = 165 mA
Pi = 0.9 W
Effective internal capacitance; Ci = 22.5 nF
Effective internal inductance; Li = 730 µH
Note 3. Installation
• All wiring shall comply with local installation
requirements. (Refer to the installation diagram)
Note 4. Maintenance and Repair
• The instrument modification or parts replacement
by other than authorized representative of
Yokogawa Electric Corporation is prohibited and
will void KEMA Intrinsically safe Certification.
Transmitter
Supply Safety Barrier *1
Nonhazardous Location
[Installation Diagram]
Hazardous Location
+
–
+
–
F0208.EPS
*1: In any safety barriers used the output current must be limited
by a resistor “R” such that Imaxout-Uz/R.

IM 1C22H1-01E
2-8
2. HANDLING CAUTIONS
b. CENELEC (KEMA) Flameproof Type
Caution for CENELEC (KEMA) flameproof type.
Note 1. Model EJA Series differential, gauge, and
absolute pressure transmitters with
optional code /KF1 for potentially explo-
sive atmospheres:
• Type of Protection and Marking Code: EEx d IIC
T6···T4
• Temperature Class: T6, T5, and T4
• Maximum Process Temperature:
85°C (T6), 100°C (T5), and 120°C
• Ambient Temperature: –40 to 80°C
Note 2. Electrical Data
• Supply voltage: 42 V dc max.
• Output signal: 4 to 20 mA
Note 3. Installation
• All wiring shall comply with local installation
requirement.
• The cable entry devices shall be of a certified
flameproof type, suitable for the conditions of use.
Note 4. Operation
• Keep the “CAUTION” label to the transmitter.
CAUTION: WAIT 1 MIN. AFTER
POWER-DISCONNECTION, BEFORE
OPENING THE ENCLOSURE.
• Take care not to generate mechanical sparking
when accessing to the instrument and peripheral
devices in a hazardous location.
Note 5. Maintenance and Repair
• The instrument modification or parts replacement
by other than authorized representative of
Yokogawa Electric Corporation is prohibited and
will void KEMA Flameproof Certification.
c. IEC (KEMA) Type of Protection “n”
Caution for IEC (KEMA) Type of Protection “n.”
Note 1. Model EJA Series pressure transmitters
with optional code /KU1 for potentially
explosive atmospheres.
• Type of Protection and Marking Code:
Ex nA IIC T4
• Temperature Class: T4
• Process Temperature: 120°C max.
• Ambient Temperature: –40 to 60°C
Note 2. Electrical Data
• Supply and output circuit ≤30 V dc, 165 mA
(terminals + and –)
Note 3. Installation
• All wiring shall comply with local installation
requirements. (refer to the installation diagram)
Note 4. Maintenance and Repair
• The instrument modification or parts replacement
by other than authorized representative of
Yokogawa Electric Corporation is prohibited and
will void KEMA Type of Protection “n” Certifica-
tion.
Power Supply
(Zone 2 only)
Transmitter
Supply
Nonhazardous Location
[Installation Diagram]
Hazardous Location
+
–
+
–
F0209.EPS
Ratings of the Power Supply as follows;
Maximum Voltage: 30 V
Maximum Current: 165 mA
d. CENELEC (KEMA) Intrinsically Safe Type/
CENELEC (KEMA) Flameproof Type/IEC
(KEMA) Type of Protection “n”
Model EJA Series pressure transmitters with
optional code /KU1 can be selected the type of
protection (CENELEC (KEMA) Intrinsically
Safe or CENELEC (KEMA) Flameproof or IEC
(KEMA) Type of Protection “n”) for use in
hazardous locations.
Note 1. For the installation of this transmitter,
once a particular type of protection is
selected, any other type of protection
cannot be used. The installation must be
in accordance with the description about
the type of protection in this instruction
manual.
Note 2. In order to avoid confusion, unnecessary
marking is crossed out on the label other
than the selected type of protection when
the transmitter is installed.

IM 1C22H1-01E
2-9
2. HANDLING CAUTIONS
2.9.5 JIS Certification
JIS Flameproof and Intrinsically Safe Type
The model EJA Series pressure transmitters with
optional code /JF1 and /JS1, which have obtained
certification according to technical criteria for explo-
sion-protected construction of electric machinery and
equipment(Standards Notification No. 556 from the
Japanese Ministry of Labor) conforming to IEC
standards, are designed for hazardous areas where
explosive gases and/or inflammable vapors may be
present. [JIS Flameproof Type(optional code /JF1)
allows installation in Division 1 and 2 areas, and JIS
Intrinsically Safe Type(optional code /JS1) allows
installation in Division 0, 1, and 2 areas.]
To observe the safety of flameproof equipment requires
great care during mounting, wiring, and piping. Safety
requirements also place restrictions on maintenance
and repair activities. Users absolutely must read
“Installation and Operating Precautions for JIS Intrinsi-
cally Safe Equipment and Flameproof Equipment” at
the end of this manual.
CAUTION
(For JIS flameproof type without integral indicator)
When the fill fluid near the sensor part moves
from within, the instrument outputs a failure
signal either high or low of the specific signal. In
that case, generate the alarm to identify that the
failure signal is output since the event may
invalidate the flameproof approval.
If the optional integral indicator is equipped, the
indicator identifies the alarm on its display.
Therefore, no other alarm generation is neces-
sary.
Transmitter
Hazardous Location Nonhazardous Location
Power
Supply DCS
Display
4 to 20 mA DC 1 to 5 V DC
F0210.EPS
Figure 2.3 Example of using DCS (Distributed Control
System)
2.10 EMC Conformity Standards
For EMI (Emission): EN55011, AS/NZS 2064 1/2
For EMS (Immunity): EN50082–2
NOTE
YOKOGAWA recommends customer to apply
the Metal Conduit Wiring or to use the twisted
pair Shield Cable for signal wiring to conform the
requirement of EMC Regulation, when customer
installs the EJA Series Transmitters to the plant.

IM 1C22H1-01E
3-1
3. COMPONENT NAMES
3. COMPONENT NAMES
Transmitter section*
*See below for details.
Pressure-detector section
Cover flange
Diaphragm seal
(high pressure side)
Diaphragm seal
(low pressure side)
Diaphragm Flange
Capillary tube
F0301.EPS
Figure 3.1.1 Component Names (Model EJA118W External View)
F0302.EPS
Transmitter section
Integral
indicator
(Note 1)
Mounting screw
Range-setting switch
(Note 1)
(See Subsection 6.5)
Amplifier cover
Cover
flange
Zero-adjustment screw
Conduit connection
Terminal box cover
Pressure-detector section
Setting pin (CN4)
position
(Note 2)
Burn-out
direction Output at burn-out
H
L
H
L
HIGH
LOW
110% or
higher
- 5% or
lower
External indicator
conduit connection
(Note 1)
CPU assembly
Setting pin
(CN4)
Note 1: Options depend on your order specifications. For details, see Subsection 9.2, “Model and Suffix Codes.”
Note 2: • Insert the pin (CN4) as shown in the above figure into the H or L side. The pin is set to the H side for delivery (unless
option code /C1 is otherwise specified in the order).
• The setting can be confirmed by calling up parameter D52 using the BRAIN TERMINAL. Refer to Subsection. 7.3.3 (11).
Display Symbol
%, Pa, hPa, kPa, MPa, kgf/cm
2
, gf/cm
2
, mbar, bar,
atm, mmHg, mmH
2
O, inH
2
O, inHg, ftH
2
O, psi, Torr
Meaning of Display Symbol
Display mode is ‘square root’. (Display is not lit when ‘proportional’ mode.)
The output signal being zero-adjusted is increasing.
The output signal being zero-adjusted is decreasing.
Select one of these seventeen available engineering units for the display.
T0301.EPS
Figure 3.1.2 Component Names (Transmitter Section Details)

IM 1C22H1-01E
4-1
4. INSTALLATION
4. INSTALLATION
4.1 Precautions
jBefore installing the transmitter, read the cautionary
notes in Section 2.4, “Selecting the Installation
Location.” For additional information on the
ambient conditions allowed at the installation
location, refer to Subsection 9.1 “Standard Specifi-
cations.”
IMPORTANT
• When welding piping during construction, take
care not to allow welding currents to flow
through the transmitter.
• Do not step on this instrument after installation.
4.2 Mounting the Diaphragm
Seals
Mount the diaphragm seals using the flanges as shown
in Figure 4.2.1. Figure 4.2.2 shows how to mount the
diaphragm seals on a tank. The customer should
prepare the mating flange, gasket, bolts and nuts.
Nut
Flange
Diaphragm
ød
Gasket
F0401.EPS
Bolt
The product is shipped with
these parts assembled.
Correctly install the diaphragm seals on
the high and low pressure sides of the
process, checking the label on each seal.
Figure 4.2.1 Mounting the Diaphragm Seals
IMPORTANT
Please use a gasket which has a bigger inside
diameter than that of gasket facing (ød) on
diaphragm seal. In case a gasket which has a
smaller inside diameter than that of gasket
facing is used, it may cause an error as the
gasket prevents diaphragm from working cor-
rectly. (Refer to Subsection 9.4 ‘Dimensions’)
IMPORTANT
• When measuring the liquid level of the tank,
the minimum liquid level (zero point) must be
set to a level at least 50 mm above the center
of the high pressure side diaphragm seal (see
Figure 4.2.2).
• Correctly install the diaphragm seals on the
high and low pressure sides of the process,
checking the label on each seal.
• To avoid measuring error duets temperature
difference between the two diaphragm seals,
capillary tube must be bound together. The
capillary tube must be securely fixed to the
tank wall to prevent movement by wind or
vibration. If the capillary tube are too long,
loosely coil the excess and secure using
suitable clamps.
• During the diaphragm seal installation, ensure
as far as possible that no seal liquid head is
applied to the diaphragm seals.
• Exercise care so as not to damage diaphragm
surfaces. Since the diaphragm protrudes
approx. 1mm from the flange surface, placing
the diaphragm seals with their diaphragm
surfaces facing downward may damage the
diaphragm surfaces.
• Do not sharply bend or twist capillary tube or
apply excessive stress to them.
F0402.EPS
Low
pressure
side
High
pressure
side 50mm minimum
Minimum
liquid level
The transmitter should be installed as low
as possible below the position where the
high pressure side diaphragm seal is
installed.
IMPORTANT
Install the sealed diaphragm
so that the shank positions
downward.
Figure 4.2.2 Installing the Diaphragm Seals to a Tank

IM 1C22H1-01E
4-2
4. INSTALLATION
4.3 Transmitter Mounting
jThe transmitter can be mounted on a nominal 50
mm (2-inch) pipe using the mounting bracket
supplied, as shown in Figure 4.3.1. The transmitter
can be mounted on either a horizontal or a vertical
pipe.
jWhen mounting the bracket on the transmitter,
tighten the (four) bolts that hold the transmitter to a
torque of approximately 39 N·m {4 kgf·m}.
Horizontal pipe mounting
Vertical pipe mounting
Transmitter
mounting bolt
U-bolt nut
Mounting bracket
50mm (2-inch) pipe
U-bolt
F0403.EPS
Figure 4.3.1 Transmitter Mounting
IMPORTANT
Never loosen the four screws securing the cover
flange or the screws at the joints between the
capillary tube and cover flanges (if the seal liquid
leaks, the transmitter cannot be used).
IMPORTANT
The transmitter should be installed at least 600
mm below the high pressure (HP) process
connection to ensure a positive head pressure of
fill fluid. Pay special attention to vacuum applica-
tions. If it can not be installed at least 600 mm
below the HP process connection, please use
the equation below:
h= 37.5310
–3
[mm]
(P–P0)3dHg
ds
h: Vertical height between the HP process
connection and the transmitter (mm)
h≤0: Install the transmitter at least h (mm)
below the HP process connection
h>0: Install the transmitter at most h (mm)
above the HP process connection
P: Pressure in the tank (Pa abs)
P0: Minimum working pressure limit of the
transmitter (Pa abs)
If the ambient temperature range is
–10 to 50°C.
3178 (Wetted parts material code S)
3596 (Wetted parts material code T)
6074 (Wetted parts material code H)
4711 (Wetted parts material code U)
ds: Specific gravity of fill fluid (at 25°C), refer
to GS 1C22H1-E.
dHg:Specific gravity of the Mercury 13.6
(at 25°C)
F0404.EPS
P
h
Low pressure side
0
High
pressure
side
(+)
(–)
Figure 4.3.2 Example of Installation to Tank (Caution on
Installation)