ENMET ISA-M User Manual
Page 7
ISA – M
ENMET Corporation
5
4.2 Sensor Location
Gases have different densities. Some are heavier than air and concentrate at the bottom of a space. Some are lighter
than air and gather at the top. Consider the density of the gas you want the sensor to detect when you install the
sensor. Some examples are given below.
Table 1: Heavier than Air
Gas
Sensor Location
Bottled LP (liquefied petroleum)
Propane
Butane
Gasoline
Trichloroethylene
Vaporized hydrocarbons
Hydrogen sulfide
Interior wall; 18-24" from floor.
§ D
O
N
OT
locate directly above or beside gas
appliances (ovens, heaters).
§ Avoid locating anywhere near a vent or window or
near an outside doorway.
Table 2: Lighter than Air
Gas
Sensor Location
Natural gas (methane)
Ammonia
Hydrogen
Near ceiling.
§ D
O
N
OT
locate directly above appliances where it is
subject to direct exposure to heat or steam.
Table 3: Same Density as Air
Gas
Sensor Location
Carbon Monoxide
4-6 feet above the (generally uniform) floor.
§ D
O
N
OT
locate in direct air currents of windows, doors, or vents.
If you have a question involving the location of a unit or sensor, please contact your distributor or ENMET personnel.
A technician will analyze the question and recommend a location.