Detcon DM-434B - Manual (Page 7)

by facility engineers with experience in similar processes.
Ventilation - Normal ventilation or prevailing wind conditions can dictate efficient location of gas sensors
in a manner where the migration of gas clouds is quickly detected.
Personnel Exposure - The undetected migration of gas clouds should not be allowed to approach concen-
trated personnel areas such as control rooms, maintenance or warehouse buildings. A more general and
applicable thought toward selecting sensor location is combining leak source and perimeter protection in
the best possible configuration.
Note: In all installations, the sensor in stainless steel housing points down relative to grade (Fig. 1).
Improper sensor orientation will result in false reading and permanent sensor damage.
5.3 Local Electrical Codes
Sensor and transmitter assemblies should be installed in accordance with all local electrical codes. Use
appropriate conduit seals. Drains & breathers are recommended. The sensor assemblies are designed to
meet NEC and CSA requirements for Class I; Groups B, C, D; Div. 1 environments.
Note: An appropriate conduit seal must be located within 18" of the sensor assembly. Crouse Hinds type
EYS2, EYD2 or equivalent are suitable for this purpose.
5.4 Installation Procedure
a) Remove the junction box cover and un-plug the control transmitter by pulling it out via the pull ring.
b) Securely mount the sensor junction box in accordance with recommended practice. See dimensional
drawing (Fig. 2).
Detcon Model DM-434B Oxygen Sensor PG.7
EYS
Seal
Fitting
Drain
“T” Plug any unused ports.
Figure #1
4 3/4"
3/4" NPT
1/4" Dia.
Mounting Holes
7 1/2"
6 1/8"
5 1/2"
3/4" NPT
Rain
Shield
2"
2 1/8"
Figure #2