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■ 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 Hazardous Area 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
14
TY-EJ15-003A Rev.2
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