4
A100h
JANUARY 2020
GAS DETECTION SYSTEM
CONFIGURATIONS
There are a number of typical installation configurations
to meet national and local codes. These diagrams are
just examples.
RELIEF VALVE VENT LINE
Often the vent line is extended high above the ground
or roof. The sensor element can be installed near the
outlet of the vent line and the gas detector electronics
REM O TE SENSO R W ITH M O NITO R
INDOOR
O UTDO O R
VISUAL
AUDIBLE
G AS
SENSO R
VISUAL
AUDIBLE
ALARM
ALARM
ALARM
ALARM
SIMPLE ALARM SYSTEM
INDOOR
OUTDOOR
VISUAL ALARM
AUDIBLE ALARM
GAS
SENSOR
INSIDE SPACE
OUTSIDE SPACE
GAS SENSOR ELEMENT
10' (3m) CABLE, MAX
WEATHER PROOF
GAS SENSOR ELECTRONICS
RELIEF LINE DISCHARGE HEADER
DRIP LEG
INSTALL
GAS SENSOR
ELEMENT WITHIN
2' (.7m) OF
DISCHARGE
VENT LINE APPLICATION
PROTECT
EXIT WITH
SUITABLE
OPTIONAL TUBING
LINE For "BUMP" TESTING
GAS AND AIR PURGE
ROOF LINE
PIPE TEE
GAS SENSOR ELEMENT
1" X 3/4"
TO ALLOW A SMALL AMOUNT OF
AIR FLOW TO CLEAR DETECTED
GASES AND AVOID FALSE ALARMS
REDUCING BUSHING
SCREEN
STAND ALONE CONTROL
The Hansen Gas Detector can operate as a stand alone
device. All that is needed is a 24V AC/DC power supply
LOCAL AND REMOTE VISUAL/AUDIBLE
ALARM
Sometimes it may be advantageous to have both
local and remote displays and alarms. A display/
FIG. 5
FIG. 6
FIG. 7
INSIDE ROOM
OUTSIDE ROOM
mounted at a convenient height for servicing. A small
length of tubing can be run for injecting test gas near
the sensor element. Install a plug with a small opening
to allow a small air flow to clear fugitive gases and
detected gas after a release. Hansen recommends the
alarm setting at 5000 PPM.
For water diffuser systems where the relief valve vent
piping is diverted into a water diffusion tank, install the
vent line detector on the diffusion tank exhaust vent,
not on the piping to the diffusion tank.
alarm control inside or just outside of a room can be
monitored and the same display/alarm or a Hansen
monitor in the control room can also alert the operator
to an abnormal condition in the plant.
for the gas detector and auxiliary devices for light,
horn or digital readout, such as the Hansen GAS Alert
