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■ 7.3 System Configuration Diagram
7.3.1 Insulated barrier
Hazardous Area
Intrinsically safe device
(EJ15)
Ground
Thread
*1 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.
7.3.2 Zener barrier
Hazardous Area
Intrinsically safe device
(EJ15)
■ 7.4 Example Wiring
7.4.1 Insulated barrier
Install the intrinsically safe device (EJ15) in the Hazardous Area, and the safety
barrier (insulated barrier) and general equipment (power supply and receiver) in the
Non-hazardous Area as shown in the connection diagram on and after the next page.
When you purchase an insulated barrier, a single Class A grounding under the
intrinsically safe regulations is not required. For wiring and other details, refer to the
instruction manual of the purchased product.
Safety barrier
(Insulated barrier)
Non-hazardous Area
Safety barrier
(Insulated barrier)
Power
supply
18 to 30V
Receiver
< Figure 7-4 >
Safety barrier
(zener barrier)
< Figure 7-5 >
23
Non-hazardous Area
Power
supply
20 to 35V
Receiver
Input 1
Input 2
Non-hazardous Area
Receiver
Single Class A grounding
Power
supply
18 to 30V
Receiver 1
Receiver 2
Power
supply
24V
TY-EJ15-003A Rev.2
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