RKI Instruments GD-70D Series - Manual (Page 17)

2 Installation 2-1. Requirements
- 17 - GD-70D
Do not install the detector in a place exposed to
direct sunlight or sudden changes in the
temperature.
When you select installation sites, avoid a place where it is
exposed to direct sunlight or radiant heat (infrared rays emitted
from a high-temperature object), and where the temperature
changes suddenly. Condensation may be formed inside the
detector, or the detector cannot adjust to sudden changes in the
temperature.
Keep the detector (and its cables) away from noise
source devices.
When you select installation points, avoid a place where
high-frequency/high-voltage exist.
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 equipment must be stopped when maintenance is performed
in its inside, where parts of the equipment 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 equipment which is not properly grounded.
Before installing the detector in equipment, the equipment 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.
<Precautions for system designing>
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 when the system is being stabilized. In such cases, use a safety power
supply, or take appropriate actions on the receiving side.
The detector must be provided with the following power supply.
Power supply voltage 24 VDC ± 10% (the terminal voltage of the detector)
Allowed time of
momentary blackout Up to 10 millisecond (To
recover from the
momentary blackout for 10
millisecond or more,
restart the detector.) Example of actions
To ensure continuous operation and activation, install
a protective power supply outside the detector.
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.
Heat radiation designing
When it is installed in the closed instrumentation board, attach ventilation fans above and below the board.
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.