2 Important Notices on Safety
2-3. Precautions
GD-D58 Series
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2-3. Precautions
CAUTION
Do not use a transceiver or other equipment near the detector head.
Radio wave from a transceiver near the detector head or its cables may disturb operations. If a
transceiver is used, it must be used in a place where it disturbs nothing.
To restart the detector head, wait for five seconds or more before doing it.
Restarting the detector head in less than five seconds may cause errors.
Do not disassemble/modify the detector head, or change the settings if not necessary.
Disassembling/modifying the detector head will invalidate the warranty of the performance.
Changing the settings without understanding the specifications may cause alarm malfunctions.
Please use the detector head properly in accordance with the operating manual.
Avoid applying organic solvents and others to the window plate for a long time.
The window plate material is a polycarbonate resin. When organic solvents (liquid or highly-
concentrated vapor) and others are applied to the plate for a long time, its color and shape may be
changed.
Never fail to perform a regular maintenance.
Since this is a safety unit, a regular maintenance must be performed to ensure safety. Continuing
to use the detector head without performing a maintenance will deteriorate the sensitivity of the
sensor, thus resulting in inaccurate gas detection.
Use the low flow rate alarm function only under the atmosphere of air or nitrogen.
The flow sensor measures the change of radiation amount caused by air current.
Different air type has a different radiation characteristic, which can result in malfunction.
For the following gas types and concentrations, the low flow rate warning function can not be used.
Example) argon, helium, and hydrogen > 5 vol %, carbon dioxide, propane, ethane > 50 vol %,
methane > 25 vol %
When using the low flow rate alarm function, use any filter depending on the operating
environment.
Otherwise dust and/or mist can cause clogging on the flow sensor, which can result in malfunction.
Set a dust filter and/or mist separator on the upstream side of tubing depending on the operating
environment.
