June 12, 2012
Page 9 out of 14
[Installation]
1. Place
1) Horizontal: Close to the highly suspected place for gas leakage, such as gas valve and connection of
gas pipe considering weight and stay of gas.
2) Vertical: Considering the specific gravity of target gas (air = 1),
▷
Light gas (specific gravity is less than 1): Please install the sensor 20 – 30cm from ceiling in closed
room. If it is open area, please install the sensor high and closest as possible to the suspected point
for gas leakage.
▷
Weight gas (specific gravity is more than 1): Please install the sensor 20 – 30cm from the floor. If it is
open area, please install the sensor low and closest as possible to the suspected point for gas
leakage.
2. Cautions
1) Please avoid vibrating or physical impacting place. Vibration or physical impact can affect the output
value.
2) Please avoid the high temperate or humid place. High temperate or humidity can result in malfunction.
3) Please avoid electronic noise area which has high frequency or high voltage such as motor, pump, or
high voltage power cable.
4) Please secure enough space for convenient maintenance. As DA-50 needs periodical maintenance
and calibration, you have to avoid inconvenient place for these jobs. Otherwise, we recommend
suction type detector.
5) Cable
We recommend shield type cable to prevent external noise and cable duct, conduit pipe, or flexible to
prevent external impact. Also, please avoid the junctions between cables. Otherwise, we recommend
junction box.
- Cable specification and transmission distance
Transmission distance
0 ~ 500m
501 ~ 1,500m
Over 1,500m
Cable specification
0.75sq
1.25sq
2.0sq
In case of pressure-proof built-in cable package, please choose the cable with proper outer diameter fit in
inner size of package and tighten the cable gland sufficiently in order to prevent any inflow of gas or flame.
