4 How to Use
4-3. Precautions for system designing
GD-D58 Series
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Keep the detector head (and its cables) away from noise source devices.
When selecting installation points, avoid a place where high-frequency/high-voltage devices exist.
Do not install the detector head in a place where maintenance of the detector head cannot be performed
or where handling the detector head involves dangers.
Regular maintenance of the detector head must be performed.
Do not install the detector head in a place where the machinery must be stopped when maintenance is
performed in its inside, where parts of the machinery must be removed to perform maintenance, or where
the detector head cannot be removed because tubes or racks prevent access to it. Do not install the
detector head in a place where maintenance involves dangers, for example, near a high-voltage cable.
Do not install the detector head in machinery which is not properly grounded.
Before installing the detector head in machinery, the machinery must be grounded properly.
Do not install the detector head in a place where other gases exist around it.
The detector head must not be installed in a place where other gases exist around it.
4-3. Precautions for system designing
Using a stable power supply
The external output and alarm contact of the detector head 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
(uninterrupted power supply), or take appropriate actions on the receiving side of output signals.
The detector head must be provided with the following power supply.
Power supply voltage
GD-D58·AC: 100 - 110 VAC ±10%, 50/60Hz: Terminal voltage of the detector
head
GD-D58·DC: 24 VDC
10%
: Terminal voltage of the detector head
Allowed time of
momentary blackout
GD-D58·AC:
Less than approx. 200 msec
(To recover from the momentary
blackout for 200 milliseconds or more,
restart the detector head.)
GD-D58·DC:
Less than approx. 10 msec
(To recover from the momentary
blackout for 10 milliseconds or more,
restart the detector head.)
Example of actions
To ensure continuous operation and
activation, install an UPS outside the
detector head.
Others
Do not use it with a power supply of
large power load or high-frequency
noise.
Example of actions
Use a line filter to avoid the noise
source if necessary.
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
head.
