Precautions For System Designing - RKI Instruments SD-1GH Operating Manual

Do not install the detector in a place where maintenance of the detector cannot be performed or where
handling the detector involves dangers.
Regular maintenance of the detector must be performed.
Do not install the detector in a place where the machinery must be stopped when maintenance is performed,
where parts of the machinery must be removed to perform maintenance, or where the detector cannot be
removed because tubes or racks prevent access to it. Do not install the detector in a place where
maintenance involves dangers (for example, near a high-voltage cable).
Do not install the detector in machinery which is not properly grounded.
Before installing the detector in machinery, the machinery must be grounded properly.
Do not install the detector in a place where other gases exist around it.
The detector must not be installed in a place where other gases exist around it.

4-3. Precautions for System Designing

CAUTION
An unstable power supply and noise may cause malfunctions or false alarms.
The descriptions in this section must be reflected on the designing of a system using the detector.
Using a stable power supply
The external output and alarm contact of the detector may be activated when the power is turned on, when
momentary blackout occurs, or while the system is being stabilized. In such cases, use a UPS or take
appropriate actions on the receiving side of output signals.
The detector must be provided with the following power supply.
Power supply
voltage
Allowed time of
momentary
blackout
Others
SD-1GH
24 VDC (17 – 26.4 VDC): Terminal voltage of the detector
Up to 10 milliseconds
(To recover from a momentary
blackout longer than 10 milliseconds,
restart the detector.)
Do not use it with a power supply that
has a large power load or
high-frequency noise.
Example of actions
To ensure continuous operation and
activation, install a UPS outside the
detector.
Example of actions
Use a line filter to avoid the noise
source.
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