2. Important Notices on Safety
2-1. Danger cases
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2
2.
Important Notices on
Safety
2-1. Danger cases
DANGER
This detector head employs the intrinsically safe explosion-proof structure (safety maintaining device
used separately); however, never attempt to detect a gas over the lower explosive limit (LEL).
2-2. Warning cases
WARNING
Power supply
Before turning on the detector head, always check that the voltage is properly applied.
Need of grounding circuit
Do not cut the grounding circuit inside or outside the detector head or disconnect the wire from
the grounding terminal.
In both of the cases, the detector head will be in danger.
Defects in protective functions
When seeming defects are found in the protective functions, such as protective grounding, do not
start the detector head.
Before starting the detector head, check the protective functions for defects.
Grounding Zener Barrier
Never fail to perform A type grounding for Zener Barrier.
Operation in a gas
The detector head employs the intrinsically safe explosion-proof structure (safety maintaining
device used separately).
It can be used in a location where a combustible or explosive gas, or steam is present; however,
it should be done carefully.
Consult RIKEN KEIKI before operating the detector head in such a location.
External connection
Before connecting the detector head to the external control circuit, securely connect it to a
protective grounding circuit.
