Nagano Keiki EJ15 User manual

User's Manual
EJ15 Intrinsically Safe Pressure Sensor
for High Pressure Hydrogen Application
（EJ15-□□H）
7.2

2 TY-EJ15-003A Rev.2
FOR PROPER AND SAFE USE
Thank you for purchasing the EJ15 intrinsically safe pressure sensor for high-pressure
hydrogen application. To use this product properly and safely, read this user's manual
carefully. This pressure sensor has passed the type approval test in compliance with IECEx
for intrinsically safe construction, which can be used even in Zone 0 areas where Explosive
Gases are present at all times. Incorrect use may cause malfunction and result in personal
injuries or accidents.
After reading this manual, keep it in a safe place for future reference.
■ Definition of Safety Terms
Safety precautions in this manual are classified according to the following definitions.
Indicates the risk that users may suffer from damage
including death or serious injury, and extremely high
urgency at the time of occurrence of risk.
Indicates the risk that users may suffer from damage
including death or serious injury.
Indicates the risk that users may suffer from minor injury
and the risk that only property damage may be caused.
■ Description of Graphic Symbols
Graphical
symbols
Meaning
Generally prohibited activities
Indicates prohibited activities in handling the product.
General instructions
Indicates activities based on instructions that users are forced
to conduct.
Other information
Indicates precautions, special operating methods, and other
important information.
WARNING
DANGER
CAUTION

3 TY-EJ15-003A Rev.2
■ Precautions for Handling Product
Do not apply excessive load, vibration or shock.
Damage to the product and release of measuring fluid may be
caused, which results in injury or damage to the surrounding
environment.
Repeated applied pressure shall be within the rated pressure
range and shall not exceed the maximum allowable pressure.
Damage to pressure elements may be caused, which results in
injury or damage to the surrounding environment.
When measuring fluid is oxygen, use a degreased product.
Oil may be left in general products, reacting with oxygen, and
causing fire or explosion.
Applying high pressure will lower the gas ignition temperature,
which increases the risk of ignition or explosion. When using the
product, avoid exceeding the ignition temperature of the gas in
consideration of high pressure.
This instrument is designed to be explosion proof.
Do not use, install, store, or attempt to impair explosion-proof
performance in any of the following environments.
1) Installation that impairs the explosion-proof performance of an
intrinsically safe circuit (hereinafter called the "Intrinsically Safe
Circuit")
•Where exceeding an ambient temperature of 60 deg.C *1
•Where exposed to direct sunlight *1
•Where liquids, such as rain, may be splashed *2
•Where atmosphere contains moisture, salt, or sulfur *2
2) Wiring that impairs the explosion-proof performance of
Intrinsically Safe Circuits *3
3) Maintenance and inspection of the product in a Hazardous Area *4
Do not use this product on measuring fluid which are corrosive to
fluid or gas contacting areas.
Do not use this product if failure or malfunction of the product
may threaten human life directly or cause harm to human bodies.
Do not modify the product.
If the product is disassembled or modified, or modified by adding
new functions, there is a risk of bodily injury.
*1 Exposure to direct sunlight will exceed the intrinsically safe allowable temperature of 60 deg.C and impair the
intrinsically safe protection performance. Install the product in a location that is not exposed to direct sunlight.
*2 The case may corrode due to the effects of weather, sea wind, condensation, etc. and the safety protection
performance may be impaired, or moisture in the air may enter the case and impair the safety insulation
performance. Install the case in a place that is not affected by such effects.
*3 For details, refer to "7. WIRINGAND CONNECTION".
*4 Only inspect this product in the Hazardous Area by visual inspection. Other maintenance work should be
performed in a "Non-hazardousArea" and never in the Hazardous Area.
Avoid electrostatic charging. When cleaning the product, use a soft cloth containing water.
WARNING

4 TY-EJ15-003A Rev.2
Conduct wiring correctly according to the wiring procedure
described in the User’s Manual.
Incorrect wiring may cause failures or fires.
Use the product within the operating temperature range.
Otherwise, the product fails or is damaged, which causes injury
or damage to the surrounding environment.
Install the product in accordance with the installation
instructions in the User's Manual.
For repair, please contact us.
Disassembly or modification of the product on your own may
cause failures.
* These precautions are selected from our common safety precautions for all products that correspond to
the EJ15 pressure sensor. EJ15-specific precautions are further described in detail in the following
sections.
CAUTION

5 TY-EJ15-003A Rev.2
TABLE OF CONTENTS
FOR PROPER AND SAFE USE...............................................2
■ Definition of Safety Terms ................................................................................ 2
■ Description of Graphic Symbols ...................................................................... 2
■ Precautions for Handling Product.................................................................... 3
1. INTRODUCTION ..................................................................6
2. PRODUCT OVERVIEW........................................................6
■ 2.1 Features ..................................................................................................... 6
■ 2.2 Operating Principle .................................................................................... 6
3. SPECIFICATIONS................................................................7
■ 3.1 General Specifications............................................................................... 7
■ 3.2 Intrinsically Safe Specification ................................................................... 8
4. DIMENSIONS.....................................................................10
■ 4.1 External Dimensions (Typical) .................................................................10
5. TRANSPORTATION AND UNPACKING ............................ 11
■ 5.1 Precautions for Transportation..................................................................11
■ 5.2 Precautions for Unpacking........................................................................11
6. INSTALLATION AND REMOVAL....................................... 11
■ 6.1 Pressures Sensor .....................................................................................11
■ 6.2 Mounting Direction................................................................................... 13
■ 6.3 Safety Barrier ........................................................................................... 14
■6.4 Cable........................................................................................................ 14
■ 6.5 Precautions for Possible Water Spraying to Pressure Sensor................ 14
7. WIRING AND CONNECTION.............................................15
■7.1 Cable Gland and Transmission Cable (Crimp Terminal)......................... 15
■ 7.2 Transmission Cable with M12 Connector................................................ 20
■7.3 System Configuration Diagram................................................................ 23
■7.4 Wiring Example........................................................................................ 23
■7.5 Intrinsically Safe Equipment and Safety Barrier...................................... 29
■7.6 Wiring of Intrinsically Safe Equipment and Safety Barrier....................... 29
8. OPERATION (ENERGIZATION).........................................30
9. MEASURES AGAINST NOISE...........................................31
■ 9.1 Effects of Noise........................................................................................ 31
10. STORAGE........................................................................31
■10.1 Precautions for Storage......................................................................... 31
11. MAINTENANCE ...............................................................32
■11.1 Periodical Check-up............................................................................... 32
■11.2 Zeroing................................................................................................... 32
12. PRODUCT WARRANTY AND EXPORT ADMINISTRATION
REGULATIONS................................................................34
■12.1 Product Warranty................................................................................... 34
■12.2 ExportAdministration Regulations......................................................... 34
13. OTHER.............................................................................34

6 TY-EJ15-003A Rev.2
1. INTRODUCTION
Check the specifications of the delivered model. Incorrect pressure range, power supply
or output may cause an accident. Make sure to use a model of the designated
specifications in a location that meets your use conditions and that it is properly wired
and installed.
2. PRODUCT OVERVIEW
This pressure sensor uses a semiconductor strain gauge for the pressure detection part,
and has passed the type approval test in compliance with IECEx for intrinsically safe
construction.
It can be used in places such as high-pressure hydrogen station where combustible gas
or flammable liquid vapor (hereinafter called "Explosive Gas") exists or may exist in a
concentration with a risk of explosion or fire (hereinafter called the "HazardousArea")
■2.1 Features
•With its intrinsically safe construction, the product can be used in Zone 0, 1, and 2
HazardousAreas, where almost all types of Explosive Gas exist.
•It has excellent hydrogen-resistant characteristics with the use of SUH660 (A286) for
diaphragms and SUS316-Ni (equivalent amount) for fittings.
■2.2 Operating Principle
The product has an intrinsically safe construction, and is installed mainly in the
HazardousArea, such as a high-pressure hydrogen station. The output is 4 to 20mA DC
through a safety barrier which is installed in the Non-hazardous Area after the pressure
is measured. The measured pressure is converted into strain by the diaphragm at the
pressure receiving part, and the amount of strain is detected by the semiconductor strain
gauge deposited on the diaphragm. The detection circuit is a full-bridge type in which all
four sides of the bridge are composed of semiconductor strain gauges. The bridge
circuit provides an electrical signal proportional to the distortion, and the next circuit
transmits the signal as a DC current output of 4 to 20mADC.
< Fig. 2-1 Block Diagram (4 to 20mA DC/ 2-wire system) >
Power (+)
Power (-)
Amplifier
circuit
Detector
Regulated
circuit
Output
circuit

7 TY-EJ15-003A Rev.2
3. SPECIFICATIONS
■3.1 General Specifications
Application
High-pressure hydrogen
Wetted
materials
Pressure
sensor
SUH660
Fitting
SUS316-Ni equivalent amount
Pressure range
0 to 35, 50, 70, 100, 120 MPa
Maximum allowable
pressure *1
150% of pressure range (120% for 70 to 120 MPa)
Measuring fluid
hydrogen
Thread
G1/4B, G3/8B, G1/2B
(Thread "G1/4" and “G3/8” is available only in 50 MPa range or less.)
9/16-18UNF Female (1/4 coned and thread)
Power supply voltage
11 to 28V DC
* Refer to the following equation for the relationship between the power
supply voltage and load resistance.
Load resistance
R max (Ω) = 50E-500 [E: Power supply voltage] *2
Output
4 to 20 mA DC
Transmission system
2-wire system
Accuracy
+/-0.25 %F.S. (at 23 deg.C) (including linearity, hysteresis & repeatability)
Temperature characteristics
(Zero/ Span)
Zero
+/-0.5 %F.S. (-20 to 50 deg.C)
Span
+/-1.0 %F.S. (-20 to 50 deg.C)
Operating temperature/
humidity range
- 20 to 60 deg.C/ 35 to 85% RH (no freezing or condensation)
Storage temperature/
humidity range
- 30 to 80 deg.C/ 35 to 85% RH (no freezing or condensation)
Insulation resistance
100 MΩ or more (50V DC collectively for fitting to input-output terminal)
CE marking
Compliance directive: 2014/30/EU (EMC Directive)
Compliance standards: EN61326-1:2013; EN61326-2-3:2013
* Connect the product to an indoor power distribution network that is
not affected by lightning surge voltages or power system switching
transients.
Type
M12 connector
Terminal box
Zeroing mechanism
External adjustment (side) * push-turn type
(push and turn without removing a cover)
Case material
SUS304, SUS305, chloroprene rubber/ POM
(for zeroing mechanism)
Case protection class *3
Equivalent to IP65 (depending on JIS C 0920)
Mass
M12 connector type: 150g approx. (excluding cables)
(This will vary depending on the thread type)
Terminal box type: 450g approx. (excluding cables)
(This will vary depending on the thread type)
RoHS compliance
conforms to the RoHS Directive
< Table 3-1 >

8 TY-EJ15-003A Rev.2
*1 The maximum allowable pressure is the upper limit of pressure value which may safely be applied to
the product and remain in specification once pressure is returned to the rated range with a couple of
times over-pressurization for about 10 minutes. Effects of continuous over-pressure are not
guaranteed.
*2 The formula showing the load resistance refers to the specification of the EJ15 alone, and it will
actually depends on the combination with the safety barrier.
*3 M12 connector type is guaranteed only when the M12-connector cable is mated. Terminal box type is
guaranteed only when the appropriate cable gland and the cables are correctly installed.
■ 3.2 Intrinsically Safe Specification
3.2.1 EJ15 intrinsically safe pressure sensor
Explosion-
proof
standards
IECEx
(International)
ATEX
(Europe)
Japan
TS
(Taiwan)
NEPSI
(China)
KCs
(Korea)
Certification
No.
IECEx CML
19.0013
CML
19ATEX2063
CML
19JPN2184
TD0502IJ
(Identification No.)
GYJ19.1315
19-AV4BO-0654
Hazardous
Area
Zone 0
Category 1G
Zone 0
Zone 0
Zone 0
Zone 0
Compliance
standards
IEC60079-0:
2017
IEC60079-11:
2011
EN60079-0:
2018
EN60079-11:
2012
JNIOSH-TR-
46-1: 2015
JNIOSH-TR-
46-6: 2015
CNS3376-0
CNS3376-11
GB3836.1-2010
GB3836.4-2010
GB3836.20-2010
IEC60079-0:2017
IEC60079-11:2011
(Notification No.
2019-15)
Compliance
directive
2014/34/EU
(ATEX Directive)
Explosion-
proof
construction
Exia II C T4 Ga
Equipment protection level
Temperature class
Gas group
Intrinsically safe construction
Safety
holding
rating
Maximum input voltage (Ui) : 28V
Maximum input current (Ii) : 93mA
Maximum input power (Pi) : 651mW
Maximum internal inductance (Li) : 0 mH
Maximum internal capacitance (Ci) : 0.052 μF
Ambient temperature : - 20 to 60 degrees C
External
transmissio
n
cable
Li + Lc ≤ Lo
Lc: inductance of the external transmission cable
Ci + Cc ≤ Co
Cc: capacitance of the external transmission cable
(These will vary depending on your safety barrier.)
Withstand
voltage
500V AC, one minute
* Intrinsically safe construction is achieved only when this pressure sensor is used in combination with a
safety barrier.
< Table 3-2 >

9 TY-EJ15-003A Rev.2
3.2.2 Insulated barrier (Non-hazardous Area)
The following table shows the recommended insulated barriers (safety barriers) to be used
with the EJ15 pressure sensor. The insulation barrier does not require grounding regulated
for the intrinsically safe construction as it is isolated from the Intrinsically Safe Circuit.
Manufacturer
P&F Co., Ltd.
Cooper Industries
Japan K.K.
GM International
s.r.l
Model
KFD2-STC4-Ex1
MTL5541
D5014S
D5014D
Type approval No. (Japan)
No. TC16232
No. TC19435
No. TC21005
Explosion-proof construction
Exia IIC
Exia IIC
Exia IIC
Safety holding rating
Maximum output voltage (Uo)
25.4 V
28 V
25.9 V
Maximum output current (lo)
86.8 mA
93 mA
92 mA
Maximum output power (Po)
551 mW
0.65 W
594 mW
Maximum external inductance (Lo)
4.6 mH
4.2 mH
3.0 mH
Maximum external capacitance (Co)
0.093 μF
0.083 μF
0.100 μF
Ambient temperature
60 degrees C
60 degrees C
70 degrees C
Load resistance in safe area
800Ω MAX.(20 mA DC)
450Ω MAX.(20 mA
DC)
550Ω MAX.(20 mA
DC)
* Safety barrier can be selected by the user.
3.2.3 Zener barrier (Non-hazardous Area)
The following table shows a recommended Zener barriers (safety barrier) to be used with
the EJ15 pressure sensor.
Manufacturer
Cooper Industries
Japan K.K.
Model
MTL7787+
Type approval No. (Japan)
No. TC16447
Explosion-proof construction
Exia II C
Safety holding rating
Maximum output voltage (Uo)
28 V
Maximum output current (lo)
93 mA
Maximum output power (Po)
0.65 W
Maximum external inductance (Lo)
3.05 mH
Maximum external capacitance (Co)
0.083 μF
Ambient temperature
60 degrees C
Load resistance in safe area
RL(Ω) = 50E - 900
* Safety barrier can be selected by users.
When you use a zener barrier, a single Class A grounding work is
required under the intrinsically safe regulations.
< Table 3-3 >
< Table 3-4 >

10 TY-EJ15-003A Rev.2
4. DIMENSIONS
■ 4.1 External Dimensions (Typical)
M12 Connector
Terminal Box
* SUS316L fitting will be printed as “LC” on the hexagon part.
< Figure 4-1 >

11 TY-EJ15-003A Rev.2
5. TRANSPORTATION AND UNPACKING
■5.1 Precautions for Transportation
This precisely adjusted instrument may become inoperable when it is dropped or given
shocks. Use extreme care when transporting it.
■ 5.2 Precautions for Unpacking
- Check the appearance of a carton before unpacking it.
- Be careful not to roughly handle the package when unpacking.
- Carefully remove the product from the package to prevent it from being accidentally
dropped.
- After unpacking, check that the product has not been damaged and the model of the
product is as ordered.
- In the event of an abnormality, contact your purchasing agent or our sales office.
6. INSTALLATION AND REMOVAL
■ 6.1 Pressure Sensor
(1) When connecting the sensor to the pressure line, do not tighten the main case
body with a pipe wrench or similar tool. Be sure to use the hexagon part of the
thread for mounting and removing.
(2) Do not install the product in the pressure line with liquid in the pipeline. Since
liquid is incompressible, tightening the thread may generate high pressure and
may damage the instrument. When installing the product in the existing pressure
line, or when replacing it, remove fluid from the piping connection side, leave
about 15 to 20 mm of air before screwing it.
(3) Though this instrument has an IP65 equivalent protection class (JIS C 0920),
please select a place without direct sunlight and with little humidity and dust, and a
place hard to be splashed with oil/water to prolong the service life.
During installation, do not subject the product to excessive
shocks such as bumping or dropping.
Avoid mounting in a place where vibration or shock may occur,
especially for the terminal box type, where the terminal box part
(made of stainless steel) is heavy and may be damaged by
excessive vibration or impact.
Do not insert a wire into the pressure inlet.
Otherwise, the diaphragm will be damaged and the correct
operation will not be obtained.
Never pull or bend the cable. Also, during wiring, be careful not
to subject the product to the cable weight.
CAUTION

12 TY-EJ15-003A Rev.2
Secure sufficient space around the product for maintenance.
Wrap a tapered male pipe thread with sealing tape to prevent
leakage.
When using a parallel pipe thread, make sure that there is no
dust, dirt or scratches on the gasket and sealing surface before
installation to prevent leakage.
If there is a risk of surge pressure, use a joint with throttle and a
dampener.
Avoid installing the zeroing screw and its peripheral
components where water is splashed directly.
For the terminal box type, do not face the cable outlet upward to
prevent water from entering through the cable.
Install the EJ15 during piping so that it is grounded from the
main body (fitting) as it is required to do so. (For the terminal
box type, the grounding from the EJ15 body can also be
obtained from the M4 screw portion provided on the outer
terminal box). In the event that the grounding is unavailable
from the piping installation (EJ15 body), obtain it by using EJ15
earth terminal (shielded cable wire for M12 connector type, and
ground terminal of the terminal block for terminal box type).
However, when both the EJ15 body and earth terminal are
grounded, provide single point grounding so that there is no
potential difference.
If the temperature of the measuring medium exceeds the
operating temperature range, take heat dissipation measures at
your side to mitigate the effect from such temperature, such as
using a cooling device or installing a pipe siphon, instead of
directly inserting such medium into the EJ15 body.
If the temperature of the measuring medium is lower than the
ambient temperature (there is a temperature difference between
the measuring medium and the main body), take measures to
prevent condensation, such as extending the piping so that the
temperature of the measuring medium is equal to the ambient
temperature of the main body.
CAUTION

13 TY-EJ15-003A Rev.2
■ 6.2 Mounting Direction
6.2.1 Recommended mounting direction for M12 connector type
6.2.2 Recommended mounting direction for terminal box type
Mount the terminal box type with the terminal box facing up as
shown in Figure 6-2. When mounting the product sideways, make
sure that the terminal port faces downward.
< Fig. 6-1 Recommended mounting direction for M12 connector type >
< Figure 6-2 Recommended mounting direction for terminal box type >
Terminal port
Top
Bottom
Bottom
Bottom
Top
Bottom
Top
Top

14 TY-EJ15-003A Rev.2
■ 6.3 Safety Barrier
For details, refer to the instruction manual of your safety barrier.
■ 6.4 Cable
The cable to be connected to the HazardousArea can be selected by the user, but
must comply with the ratings shown on the barrier and with the requirements stated
in the User's Manual. Inductance and capacitance (Lo / Co) in particular must be
strictly observed. If the cable capacitance and inductance values that are
determined based on the cable size and cable length exceeds the rated value
indicated on the barrier minus the Li and Ci values of the EJ15, the certification of
the intrinsically safe certification will be invalid.
■ 6.5 Precautions for Possible Water Spraying to Pressure Sensor
(terminal box type)
When water spraying or the like is assumed, it is recommended for
the terminal box type to be mounted so that the cable gland (cable
outlet) faces downward as shown in Fig. 6-3 to prevent water from
entering through there.
* Refer to “7.1 Cable Gland and Transmission Cable (Crimp Terminal) for Terminal
Box Type”. When installing a cable, it is recommended to lower the cable
downward first as shown in the figure below regardless of the mounting direction,
rotate it a couple of times, and install it upward so that water hardly enters or
accumulates inside the cable. Install in a same manner also when the conduit is
used to prevent water from entering.
Avoid mounting in a place where vibration or shock may occur,
especially for the terminal box type where a heavy, stainless steel
terminal box may be damaged by excessive vibration or shock.
Never pull the cable or bend it extremely. Also, during wiring, be
careful not to subject the product to the cable weight.
Atmospheric pressure is transmitted to the gauge by way of a cable.
When the cable is compressed midway due to extreme bending or
use of clamp or bushing, or when the cable is long, it will take longer
to exhaust the pressure and may cause an output error due to
pressure or temperature changes inside the case. Also, do not seal
the cable ends with taping or adhesive during wiring.
Choose a cable gland in accordance with 7.1.1. Check the waterproof
performance after installation. Select a cable gland made of metal (as
required for intrinsically safe construction).
For the transmission cable used between the terminal box type and
safety carrier, be sure to select and use a cable with an outer
diameter suitable for the size of the cable gland.
Waterproof performance (equivalent to jet-proof under IPX5) is
ensured by using cables compatible with the gland. Care must be
taken in tightening the terminal box cover or installing the wire inlet
as they may affect the waterproof performance.
* IPX5 (Regulation on protection against water jet): To ensure there is no flooding
(no adverse effect) by checking that 12.5 L/min water flow discharged from the
dia. 6.3 discharge nozzle is sprinkled in all directions (from 2.5 m to 3 m
distance) for 1 minute, 3 minutes or longer in total, per 1m2 of skin surface area.
Carefully check the waterproof performance as its equivalence to
IPX5 is guaranteed only when the respective parts are correctly
installed.
CAUTION

15 TY-EJ15-003A Rev.2
7. WIRING AND CONNECTION
■ 7.1 Cable Gland and Transmission Cable (crimp terminal) for Terminal
Box Type
Cable glands, cables and crimp terminals (round type) are not supplied with this product
(for terminal box type) and need to be prepared according to the following cable outlet
specifications.
7.1.1 Prepare a cable gland that conforms to the specifications of the cable outlet (JIS
F 8801 Type B G1/2) and conforms to IP65 or higher. Select a cable gland made
of metal in accordance with intrinsically safe requirements.
7.1.2 Transmission cable to be used between the terminal box sensor and safety
barrier should have two or more cores (or a shielded wire if grounding from the
pipe (EJ15 body) is unavailable), outside diameter matching the cable gland size,
and the lead wire with a conductor cross-sectional area (core wire) matching the
crimp terminal. The cable should also matches withstanding voltage between
cable conductors (core wires) and between the conductor and ground.
Moreover, use the cable that has less allowable parameters (see "3.2 Intrinsically
Safe Specifications") than those provided as external wiring of Intrinsically Safe
Circuits (will vary depending on your safety barrier).
Model
No.
Cable
outlet size
Compatible
cable dia. (mm)
Size of terminal block screws
(Conductor cross-sectional
area of crimp terminal
Conductor cross-sectional
area of the crimp terminal)
Withstand voltage
(V AC) 1 minute
(conductor to ground)
EJ15
JIS F 8801
Type B,
G1/2
According to
cable gland
specifications
M3.5
(0.5 to 1.25mm2)
based on JIS C 2805
500
< Table 7-1 >
< Fig. 6-3 Recommended mounting direction for possible water spraying >
Bottom
Top
Cable outlet
Cable gland
Cable

16 TY-EJ15-003A Rev.2
・Li + Lc ≤ Lo Lc: Inductance of external transmission cable
Li : Maximum internal inductance of EJ15 Intrinsically
Safe Circuit (0mH)
Lo: Maximum external inductance of Intrinsically
Safe Circuit for safety barrier
・Ci + Cc ≤ Co Cc: Capacitance of external transmission cable
Ci : Maximum internal capacitance of EJ15
Intrinsically Safe Circuit (0.052 μF)
Co: Maximum external capacitance of Intrinsically
Safe Circuit for safety barrier
7.1.3 Be sure to attach a crimp terminal (round type) to the end of the cable (lead wire)
to be connected to this instrument. Select a round crimp terminal that matches
the screw size (M3.5) of the terminal block to be connected.
7.1.4 Machine the end of the cable as shown in the figure below for the connection
to the EJ15 main unit.
(1) Remove the sheath about 60mm from the tip of the cable.
(2) Remove the coating of the lead wire to fit the crimp terminal for M3.5.
(3) Attach the crimp terminal to the end of the "+" and "-" lead wires. If the
shielded wire *1 is required, attach the crimp terminal also to the end of the
shielded wire. Be sure to cover the shielded wire with an insulating tube to
prevent short circuit.
(4) Adjust the size of the crimp terminal before mounting so as to obtain a
recommended dimension of 60 mm after mounting.
(5) Use R1.25-3.5 or equivalent (JIS C 2805) crimp terminal for M3.5.
*1 Install the EJ15 during piping so that it is grounded from the main body (fitting)
as it is required to do so in principle (For the terminal box type, the grounding
from the EJ15 body can also be obtained from the M4 screw portion provided on
the outer terminal box). In the event that the grounding is unavailable from the
piping installation (EJ15 body), obtain it by using EJ15 earth terminal (shielded
cable wire for M12 connector type, and ground terminal of the terminal block for
terminal box type). However, when both the EJ15 body and earth terminal are
grounded, provide single point grounding so that there is no potential difference.
< Figure 7-1 >

17 TY-EJ15-003A Rev.2
Choose a cable gland in accordance with 7.1.1. After
installation, check the waterproof performance. Select a cable
gland made of metal (as required for intrinsically safe
construction).
For the transmission cable used between the terminal box
type and safety carrier, be sure to select and use a cable with
an outer diameter suitable for the size of the cable gland.
Waterproof performance (equivalent to jet-proof under IPX5) is
ensured by using cables compatible with the gland. Care must
be taken in tightening the terminal box cover or installing the
wire inlet as they may affect the waterproof performance.
* IPX5 (Regulation on protection against water jet): To ensure there is no
flooding (no adverse effect) by checking that 12.5 L/min water flow
discharged from the dia. 6.3 discharge nozzle is sprinkled in all directions
(from 2.5 m to 3 m distance) for 1 minute, 3 minutes or longer in total, per
1m2of skin surface area.
Carefully check the waterproof performance as its equivalence
to IPX5 is guaranteed only when the respective parts are
correctly installed.
Use a special tool to peel off the cover and prevent damage to
the cable core.
The crimp terminal to be attached to the lead wire must be a
suitable one (round type). Do not connect Y-shaped terminals
that easily come off or bare wires that easily stick out.
The screw size of the terminal block to which the crimp
terminal is connected is "M3.5". Select a round crimp terminal
suitable for the screw size.
Be careful not to short-circuit the terminals with the core wires
of the lead wires.
When using a shielded cable, be careful not to protrude the
shield wire from the sheath end surface.
Adjust your cable according to the thickness and the flexibility
of the cable. We only provide recommended values for
processing.
Atmospheric pressure is transmitted to the gauge by way of a
cable. When the cable is compressed midway due to extreme
bending or use of clamp or bushing, or when the cable is long,
it will take longer to exhaust the pressure and may cause an
output error due to pressure or temperature changes inside
the case. Also, do not seal the cable ends with taping or
adhesive during wiring.
CAUTION

18 TY-EJ15-003A Rev.2
7.1.5 Install the cable gland to the cable outlet (refer to the instruction manual of the
gland you selected for the installation method).
7.1.6 Open the terminal box cover, pass the cable through the cable gland seal, and
insert it all the way into the cable outlet (see “Figure 7-2”).
7.1.7 Tighten the seal nut to seal the cable gland (see "Figure 7-2").
Remove the protective seal attached to the cable outlet before
use.
The protection rating of this product is guaranteed only when
the components are properly assembled. Tighten the body nut
of the cable gland securely to prevent water from entering as it
will affect the waterproof performance.
When tightening the body nut of the cable gland, hook a wrench
on the width across a flat section of the cable outlet so that no
excessive force is applied to the cable outlet.
The protection rating of this product is guaranteed only when
the components are properly assembled. Tighten the seal nut
securely to prevent water from entering as it will affect the
waterproof performance.
When tightening the seal nut, hook a wrench on the width
across a flat section of the cable outlet so that no excessive
force is applied to the cable outlet.
After tightening the seal nut, pull the cable lightly to make sure
that it does not come loose.
CAUTION
CAUTION
< Figure 7-2 >

19 TY-EJ15-003A Rev.2
7.1.8 Connect the cable with crimp terminal to the terminal block.
7.1.9 Tighten the terminal box cover firmly to seal the terminal box.
Never perform wiring with moisture on the product. Moisture or
other foreign matter entering the case may cause malfunction.
Do not perform wiring when the power is turned on. Otherwise
damage to the product and electric shock may result.
Never loosen any screws other than those on the terminal block.
Be careful not to lose any parts when wiring.
Tighten the M3.5 screws of the terminal block with a tightening
torque of 0.8 to 1.0 N·m.
When using a bare crimp terminal, keep a necessary insulation
distance with an insulation tube or others to prevent a live part
exposure for possible electric shock or short circuit (see
"Figure 7-3").
Connect so that the polarity is correct.
Be careful not to short-circuit the terminals.
The protection rating of this product is guaranteed only when
the components are properly assembled.
Ensure that the O-ring is tightly fitted to the seal surface of the
inner case (see "Figure 7-2"). Also check that there are no
scratches, breaks or dirt on the O-ring.
Tighten the O-ring so that it is not twisted over the entire
circumference.
Be careful not to get the wires caught when tightening.
Be careful not to scratch the seat surface of the inner case
(terminal box cover).
CAUTION
CAUTION
< Figure 7-3 >
Insulation tube
Insulation distance
Live part

20 TY-EJ15-003A Rev.2
7.1.10 Be sure to fix the cable in the immediate vicinity of the main body and at the
required locations so that the weight of the cable is not applied to the product as
much as possible.
7.1.11 Water-resistance of Wire Inlet
This product ensures waterproof performance by using a cable gland that meets the
specifications of the cable outlet as well as a cable with an outer diameter that matches
the gland size. Care must be taken in tightening the terminal box cover or installing the
wire inlet as they may affect the waterproof performance.
■ 7.2 Transmission Cable with M12 Connector
7.2.1 For transmission cables with M12 connector, use a transmission cable that is
compatible with M12 connector and has two or more cores (or a shielded cable if
grounding from the pipe (EJ15 body) is unavailable). Use a cable that matches the
withstand voltage (500 VAC/min.) between the conductors (core wires) of the cable
and between the conductor and ground.
7.2.2 Use the cable not exceeding the allowable parameters defined for external wiring
of the Intrinsically Safe Circuits (refer to "3.2 Intrinsically Safe Specifications") (will
vary depending on your safety barrier).
・Li + Lc ≤ Lo Lc: Inductance of external transmission cable
Li : Maximum internal inductance of EJ15 Intrinsically
Safe Circuit (0mH)
Lo: Maximum external inductance of Intrinsically
Safe Circuit for safety barrier
・Ci + Cc ≤ Co Cc: Capacitance of external transmission cable
Ci : Maximum internal capacitance of EJ15
Intrinsically Safe Circuit (0.052 μF)
Co: Maximum external capacitance of Intrinsically
Safe Circuit for safety barrier
7.2.3 Specifications of our optional M12-connector cable lineup available for wiring is
as follows (Note: optional cables does not come with a shielded wire):
Be careful not to pull the cable with excessive force.
Do not fix the cable with excessive tension.
Secure the cable to prevent vibration, shock, or other excessive
force from being applied to the product through the cables (Be
careful not to swing the cable).
Carefully check the waterproof performance as its equivalence
to IPX5 is guaranteed only when the respective parts are
correctly installed.
CAUTION
CAUTION