2. Important Notices on Safety
2-5. Important information about explosion-proof
- 5 -
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) = (
L
w) 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.
Battery
The detector head contains a battery for sensor backup. Observe the followings to maintain
explosion-proof performance.
<Usable battery>
Only the following battery can be used. Contact RIKEN KEIKI if it is difficult to purchase the battery.
Type:
AAA alkaline dry battery
Model:
LR03
Nominal voltage: 1. 5 V
Manufacturer:
TOSHIBA Corporation
<Battery Replacement>
Turn off the power of the detector head before replacing the battery.
Never fail to use the dedicated battery storage case.
Grounding
Never fail to ground the detector head (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
℃
. (See Specifications)
