2 Important Notices on Safety
2-5. Important information about explosion-proof
- 8 -
Important information about explosion-proof (continued)
Power supply
Never fail to use the following safety maintaining device (barrier) to maintain explosion-proof
performance.
Ratings to maintain safety
Intrinsically safe circuit maximum voltage (
U
o) : 28 V
Intrinsically safe circuit maximum current (
I
o)
: 93 mA
Intrinsically safe circuit maximum power (
P
o)
: 0.65 W
Performance classification and group
Performance classification : ia
Group
: IIC
Relations between the intrinsically safe circuit allowable inductance (
L
o) and intrinsically safe
circuit external wire inductance (
L
w) and between the intrinsically safe circuit allowable capacitance
(
C
o) and intrinsically safe circuit external wire capacitance (
C
w)
Intrinsically safe circuit allowable inductance (
L
o) = (Lw) or more
Intrinsically safe circuit allowable capacitance (
C
o) = 586 pF + (
C
w) or more
Wiring
Determine the cable type to use and laying distance in consideration of the above parameters to
maintain explosion-proof performance.
Perform wiring so that a current or voltage that disturbs intrinsically safe explosion-proof
performance of the intrinsically safe circuit is not induced to the circuit due to electromagnetic or
electrostatic induction.
Measuring of the density of oxygen
In the measurement of the density of oxygen, do not use it except the compound with air, the
combustible gas or steam.
Grounding
Never fail to ground the detector (D type grounding).
Others
Confirm that no combustible gas is present around before opening the door of the unit.
Never disassemble or modify the unit.
Manufacturer: RIKEN KEIKI Co., Ltd.
2-7-6 Azusawa, Itabashi-ku, Tokyo, 174-8744 Japan
www.rikenkeiki.co.jp
*1:
The temperature range to maintain explosion-proof performance
The temperature range to maintain gas detection performance is 0 to 40°C. (See
Specifications)
